platform/kernel/linux-rpi3.git
7 years agox86/fpu: Use using_compacted_format() instead of open coded X86_FEATURE_XSAVES
Eric Biggers [Sun, 24 Sep 2017 10:59:13 +0000 (12:59 +0200)]
x86/fpu: Use using_compacted_format() instead of open coded X86_FEATURE_XSAVES

This is the canonical method to use.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-11-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Use validate_xstate_header() to validate the xstate_header in copy_user_to_x...
Eric Biggers [Sun, 24 Sep 2017 10:59:12 +0000 (12:59 +0200)]
x86/fpu: Use validate_xstate_header() to validate the xstate_header in copy_user_to_xstate()

Tighten the checks in copy_user_to_xstate().

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-10-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Eliminate the 'xfeatures' local variable in copy_user_to_xstate()
Eric Biggers [Sun, 24 Sep 2017 10:59:11 +0000 (12:59 +0200)]
x86/fpu: Eliminate the 'xfeatures' local variable in copy_user_to_xstate()

We now have this field in hdr.xfeatures.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-9-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Copy the full header in copy_user_to_xstate()
Eric Biggers [Sun, 24 Sep 2017 10:59:10 +0000 (12:59 +0200)]
x86/fpu: Copy the full header in copy_user_to_xstate()

This is in preparation to verify the full xstate header as supplied by user-space.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-8-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Use validate_xstate_header() to validate the xstate_header in copy_kernel_to...
Eric Biggers [Sun, 24 Sep 2017 10:59:09 +0000 (12:59 +0200)]
x86/fpu: Use validate_xstate_header() to validate the xstate_header in copy_kernel_to_xstate()

Tighten the checks in copy_kernel_to_xstate().

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-7-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Eliminate the 'xfeatures' local variable in copy_kernel_to_xstate()
Eric Biggers [Sun, 24 Sep 2017 10:59:08 +0000 (12:59 +0200)]
x86/fpu: Eliminate the 'xfeatures' local variable in copy_kernel_to_xstate()

We have this information in the xstate_header.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-6-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Copy the full state_header in copy_kernel_to_xstate()
Eric Biggers [Sun, 24 Sep 2017 10:59:07 +0000 (12:59 +0200)]
x86/fpu: Copy the full state_header in copy_kernel_to_xstate()

This is in preparation to verify the full xstate header as supplied by user-space.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-5-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Use validate_xstate_header() to validate the xstate_header in __fpu__restore...
Eric Biggers [Sun, 24 Sep 2017 10:59:06 +0000 (12:59 +0200)]
x86/fpu: Use validate_xstate_header() to validate the xstate_header in __fpu__restore_sig()

Tighten the checks in __fpu__restore_sig() and update comments.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-4-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Use validate_xstate_header() to validate the xstate_header in xstateregs_set()
Eric Biggers [Sun, 24 Sep 2017 10:59:05 +0000 (12:59 +0200)]
x86/fpu: Use validate_xstate_header() to validate the xstate_header in xstateregs_set()

Tighten the checks in xstateregs_set().

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-3-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Introduce validate_xstate_header()
Eric Biggers [Sun, 24 Sep 2017 10:59:04 +0000 (12:59 +0200)]
x86/fpu: Introduce validate_xstate_header()

Move validation of user-supplied xstate_header into a helper function,
in preparation of calling it from both the ptrace and sigreturn syscall
paths.

The new function also considers it to be an error if *any* reserved bits
are set, whereas before we were just clearing most of them silently.

This should reduce the chance of bugs that fail to correctly validate
user-supplied XSAVE areas.  It also will expose any broken userspace
programs that set the other reserved bits; this is desirable because
such programs will lose compatibility with future CPUs and kernels if
those bits are ever used for anything.  (There shouldn't be any such
programs, and in fact in the case where the compacted format is in use
we were already validating xfeatures.  But you never know...)

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170924105913.9157-2-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Rename fpu__activate_fpstate_read/write() to fpu__prepare_[read|write]()
Ingo Molnar [Sat, 23 Sep 2017 11:37:45 +0000 (13:37 +0200)]
x86/fpu: Rename fpu__activate_fpstate_read/write() to fpu__prepare_[read|write]()

As per the new nomenclature we don't 'activate' the FPU state
anymore, we initialize it. So drop the _activate_fpstate name
from these functions, which were a bit of a mouthful anyway,
and name them:

fpu__prepare_read()
fpu__prepare_write()

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Rename fpu__activate_curr() to fpu__initialize()
Ingo Molnar [Sat, 23 Sep 2017 13:00:15 +0000 (15:00 +0200)]
x86/fpu: Rename fpu__activate_curr() to fpu__initialize()

Rename this function to better express that it's all about
initializing the FPU state of a task which goes hand in hand
with the fpu::initialized field.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-33-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Simplify and speed up fpu__copy()
Ingo Molnar [Sat, 23 Sep 2017 13:00:14 +0000 (15:00 +0200)]
x86/fpu: Simplify and speed up fpu__copy()

fpu__copy() has a preempt_disable()/enable() pair, which it had to do to
be able to atomically unlazy the current task when doing an FNSAVE.

But we don't unlazy tasks anymore, we always do direct saves/restores of
FPU context.

So remove both the unnecessary critical section, and update the comments.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-32-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Fix stale comments about lazy FPU logic
Ingo Molnar [Sat, 23 Sep 2017 13:00:13 +0000 (15:00 +0200)]
x86/fpu: Fix stale comments about lazy FPU logic

We don't do any lazy restore anymore, what we have are two pieces of optimization:

 - no-FPU tasks that don't save/restore the FPU context (kernel threads are such)

 - cached FPU registers maintained via the fpu->last_cpu field. This means that
   if an FPU task context switches to a non-FPU task then we can maintain the
   FPU registers as an in-FPU copies (cache), and skip the restoration of them
   once we switch back to the original FPU-using task.

Update all the comments that still referred to old 'lazy' and 'unlazy' concepts.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-31-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Rename fpu::fpstate_active to fpu::initialized
Ingo Molnar [Tue, 26 Sep 2017 07:43:36 +0000 (09:43 +0200)]
x86/fpu: Rename fpu::fpstate_active to fpu::initialized

The x86 FPU code used to have a complex state machine where both the FPU
registers and the FPU state context could be 'active' (or inactive)
independently of each other - which enabled features like lazy FPU restore.

Much of this complexity is gone in the current code: now we basically can
have FPU-less tasks (kernel threads) that don't use (and save/restore) FPU
state at all, plus full FPU users that save/restore directly with no laziness
whatsoever.

But the fpu::fpstate_active still carries bits of the old complexity - meanwhile
this flag has become a simple flag that shows whether the FPU context saving
area in the thread struct is initialized and used, or not.

Rename it to fpu::initialized to express this simplicity in the name as well.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-30-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Remove fpu__current_fpstate_write_begin/end()
Ingo Molnar [Sat, 23 Sep 2017 13:00:11 +0000 (15:00 +0200)]
x86/fpu: Remove fpu__current_fpstate_write_begin/end()

These functions are not used anymore, so remove them.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Bobby Powers <bobbypowers@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-29-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Fix fpu__activate_fpstate_read() and update comments
Ingo Molnar [Sat, 23 Sep 2017 13:00:10 +0000 (15:00 +0200)]
x86/fpu: Fix fpu__activate_fpstate_read() and update comments

fpu__activate_fpstate_read() can be called for the current task
when coredumping - or for stopped tasks when ptrace-ing.

Implement this properly in the code and update the comments.

This also fixes an incorrect (but harmless) warning introduced by
one of the earlier patches.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-28-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Reinitialize FPU registers if restoring FPU state fails
Eric Biggers [Sat, 23 Sep 2017 13:00:09 +0000 (15:00 +0200)]
x86/fpu: Reinitialize FPU registers if restoring FPU state fails

Userspace can change the FPU state of a task using the ptrace() or
rt_sigreturn() system calls.  Because reserved bits in the FPU state can
cause the XRSTOR instruction to fail, the kernel has to carefully
validate that no reserved bits or other invalid values are being set.

Unfortunately, there have been bugs in this validation code.  For
example, we were not checking that the 'xcomp_bv' field in the
xstate_header was 0.  As-is, such bugs are exploitable to read the FPU
registers of other processes on the system.  To do so, an attacker can
create a task, assign to it an invalid FPU state, then spin in a loop
and monitor the values of the FPU registers.  Because the task's FPU
registers are not being restored, sometimes the FPU registers will have
the values from another process.

This is likely to continue to be a problem in the future because the
validation done by the CPU instructions like XRSTOR is not immediately
visible to kernel developers.  Nor will invalid FPU states ever be
encountered during ordinary use --- they will only be seen during
fuzzing or exploits.  There can even be reserved bits outside the
xstate_header which are easy to forget about.  For example, the MXCSR
register contains reserved bits, which were not validated by the
KVM_SET_XSAVE ioctl until commit a575813bfe4b ("KVM: x86: Fix load
damaged SSEx MXCSR register").

Therefore, mitigate this class of vulnerability by restoring the FPU
registers from init_fpstate if restoring from the task's state fails.

We actually used to do this, but it was (perhaps unwisely) removed by
commit 9ccc27a5d297 ("x86/fpu: Remove error return values from
copy_kernel_to_*regs() functions").  This new patch is also a bit
different.  First, it only clears the registers, not also the bad
in-memory state; this is simpler and makes it easier to make the
mitigation cover all callers of __copy_kernel_to_fpregs().  Second, it
does the register clearing in an exception handler so that no extra
instructions are added to context switches.  In fact, we *remove*
instructions, since previously we were always zeroing the register
containing 'err' even if CONFIG_X86_DEBUG_FPU was disabled.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/20170922174156.16780-4-ebiggers3@gmail.com
Link: http://lkml.kernel.org/r/20170923130016.21448-27-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Don't let userspace set bogus xcomp_bv
Eric Biggers [Sat, 23 Sep 2017 13:00:07 +0000 (15:00 +0200)]
x86/fpu: Don't let userspace set bogus xcomp_bv

On x86, userspace can use the ptrace() or rt_sigreturn() system calls to
set a task's extended state (xstate) or "FPU" registers.  ptrace() can
set them for another task using the PTRACE_SETREGSET request with
NT_X86_XSTATE, while rt_sigreturn() can set them for the current task.
In either case, registers can be set to any value, but the kernel
assumes that the XSAVE area itself remains valid in the sense that the
CPU can restore it.

However, in the case where the kernel is using the uncompacted xstate
format (which it does whenever the XSAVES instruction is unavailable),
it was possible for userspace to set the xcomp_bv field in the
xstate_header to an arbitrary value.  However, all bits in that field
are reserved in the uncompacted case, so when switching to a task with
nonzero xcomp_bv, the XRSTOR instruction failed with a #GP fault.  This
caused the WARN_ON_FPU(err) in copy_kernel_to_xregs() to be hit.  In
addition, since the error is otherwise ignored, the FPU registers from
the task previously executing on the CPU were leaked.

Fix the bug by checking that the user-supplied value of xcomp_bv is 0 in
the uncompacted case, and returning an error otherwise.

The reason for validating xcomp_bv rather than simply overwriting it
with 0 is that we want userspace to see an error if it (incorrectly)
provides an XSAVE area in compacted format rather than in uncompacted
format.

Note that as before, in case of error we clear the task's FPU state.
This is perhaps non-ideal, especially for PTRACE_SETREGSET; it might be
better to return an error before changing anything.  But it seems the
"clear on error" behavior is fine for now, and it's a little tricky to
do otherwise because it would mean we couldn't simply copy the full
userspace state into kernel memory in one __copy_from_user().

This bug was found by syzkaller, which hit the above-mentioned
WARN_ON_FPU():

    WARNING: CPU: 1 PID: 0 at ./arch/x86/include/asm/fpu/internal.h:373 __switch_to+0x5b5/0x5d0
    CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.13.0 #453
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
    task: ffff9ba2bc8e42c0 task.stack: ffffa78cc036c000
    RIP: 0010:__switch_to+0x5b5/0x5d0
    RSP: 0000:ffffa78cc08bbb88 EFLAGS: 00010082
    RAX: 00000000fffffffe RBX: ffff9ba2b8bf2180 RCX: 00000000c0000100
    RDX: 00000000ffffffff RSI: 000000005cb10700 RDI: ffff9ba2b8bf36c0
    RBP: ffffa78cc08bbbd0 R08: 00000000929fdf46 R09: 0000000000000001
    R10: 0000000000000000 R11: 0000000000000000 R12: ffff9ba2bc8e42c0
    R13: 0000000000000000 R14: ffff9ba2b8bf3680 R15: ffff9ba2bf5d7b40
    FS:  00007f7e5cb10700(0000) GS:ffff9ba2bf400000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00000000004005cc CR3: 0000000079fd5000 CR4: 00000000001406e0
    Call Trace:
    Code: 84 00 00 00 00 00 e9 11 fd ff ff 0f ff 66 0f 1f 84 00 00 00 00 00 e9 e7 fa ff ff 0f ff 66 0f 1f 84 00 00 00 00 00 e9 c2 fa ff ff <0f> ff 66 0f 1f 84 00 00 00 00 00 e9 d4 fc ff ff 66 66 2e 0f 1f

Here is a C reproducer.  The expected behavior is that the program spin
forever with no output.  However, on a buggy kernel running on a
processor with the "xsave" feature but without the "xsaves" feature
(e.g. Sandy Bridge through Broadwell for Intel), within a second or two
the program reports that the xmm registers were corrupted, i.e. were not
restored correctly.  With CONFIG_X86_DEBUG_FPU=y it also hits the above
kernel warning.

    #define _GNU_SOURCE
    #include <stdbool.h>
    #include <inttypes.h>
    #include <linux/elf.h>
    #include <stdio.h>
    #include <sys/ptrace.h>
    #include <sys/uio.h>
    #include <sys/wait.h>
    #include <unistd.h>

    int main(void)
    {
        int pid = fork();
        uint64_t xstate[512];
        struct iovec iov = { .iov_base = xstate, .iov_len = sizeof(xstate) };

        if (pid == 0) {
            bool tracee = true;
            for (int i = 0; i < sysconf(_SC_NPROCESSORS_ONLN) && tracee; i++)
                tracee = (fork() != 0);
            uint32_t xmm0[4] = { [0 ... 3] = tracee ? 0x00000000 : 0xDEADBEEF };
            asm volatile("   movdqu %0, %%xmm0\n"
                         "   mov %0, %%rbx\n"
                         "1: movdqu %%xmm0, %0\n"
                         "   mov %0, %%rax\n"
                         "   cmp %%rax, %%rbx\n"
                         "   je 1b\n"
                         : "+m" (xmm0) : : "rax", "rbx", "xmm0");
            printf("BUG: xmm registers corrupted!  tracee=%d, xmm0=%08X%08X%08X%08X\n",
                   tracee, xmm0[0], xmm0[1], xmm0[2], xmm0[3]);
        } else {
            usleep(100000);
            ptrace(PTRACE_ATTACH, pid, 0, 0);
            wait(NULL);
            ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov);
            xstate[65] = -1;
            ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov);
            ptrace(PTRACE_CONT, pid, 0, 0);
            wait(NULL);
        }
        return 1;
    }

Note: the program only tests for the bug using the ptrace() system call.
The bug can also be reproduced using the rt_sigreturn() system call, but
only when called from a 32-bit program, since for 64-bit programs the
kernel restores the FPU state from the signal frame by doing XRSTOR
directly from userspace memory (with proper error checking).

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <stable@vger.kernel.org> [v3.17+]
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Kevin Hao <haokexin@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Halcrow <mhalcrow@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <wanpeng.li@hotmail.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kernel-hardening@lists.openwall.com
Fixes: 0b29643a5843 ("x86/xsaves: Change compacted format xsave area header")
Link: http://lkml.kernel.org/r/20170922174156.16780-2-ebiggers3@gmail.com
Link: http://lkml.kernel.org/r/20170923130016.21448-25-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Turn WARN_ON() in context switch into WARN_ON_FPU()
Andi Kleen [Sat, 23 Sep 2017 13:00:06 +0000 (15:00 +0200)]
x86/fpu: Turn WARN_ON() in context switch into WARN_ON_FPU()

copy_xregs_to_kernel checks if the alternatives have been already
patched.

This WARN_ON() is always executed in every context switch.

All the other checks in fpu internal.h are WARN_ON_FPU(), but
this one is plain WARN_ON(). I assume it was forgotten to switch it.

So switch it to WARN_ON_FPU() too to avoid some unnecessary code
in the context switch, and a potentially expensive cache line miss for the
global variable.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170329062605.4970-1-andi@firstfloor.org
Link: http://lkml.kernel.org/r/20170923130016.21448-24-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Fix boolreturn.cocci warnings
kbuild test robot [Sat, 23 Sep 2017 13:00:05 +0000 (15:00 +0200)]
x86/fpu: Fix boolreturn.cocci warnings

arch/x86/kernel/fpu/xstate.c:931:9-10: WARNING: return of 0/1 in function 'xfeatures_mxcsr_quirk' with return type bool

 Return statements in functions returning bool should use true/false instead of 1/0.

Generated by: scripts/coccinelle/misc/boolreturn.cocci

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Cc: kbuild-all@01.org
Cc: tipbuild@zytor.com
Link: http://lkml.kernel.org/r/20170306004553.GA25764@lkp-wsm-ep1
Link: http://lkml.kernel.org/r/20170923130016.21448-23-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Add FPU state copying quirk to handle XRSTOR failure on Intel Skylake CPUs
Rik van Riel [Sat, 23 Sep 2017 13:00:04 +0000 (15:00 +0200)]
x86/fpu: Add FPU state copying quirk to handle XRSTOR failure on Intel Skylake CPUs

On Skylake CPUs I noticed that XRSTOR is unable to deal with states
created by copyout_from_xsaves() if the xstate has only SSE/YMM state, and
no FP state. That is, xfeatures had XFEATURE_MASK_SSE set, but not
XFEATURE_MASK_FP.

The reason is that part of the SSE/YMM state lives in the MXCSR and
MXCSR_FLAGS fields of the FP state.

Ensure that whenever we copy SSE or YMM state around, the MXCSR and
MXCSR_FLAGS fields are also copied around.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170210085445.0f1cc708@annuminas.surriel.com
Link: http://lkml.kernel.org/r/20170923130016.21448-22-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Remove struct fpu::fpregs_active
Ingo Molnar [Sat, 23 Sep 2017 13:00:03 +0000 (15:00 +0200)]
x86/fpu: Remove struct fpu::fpregs_active

The previous changes paved the way for the removal of the
fpu::fpregs_active state flag - we now only have the
fpu::fpstate_active and fpu::last_cpu fields left.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-21-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Decouple fpregs_activate()/fpregs_deactivate() from fpu->fpregs_active
Ingo Molnar [Sat, 23 Sep 2017 13:00:02 +0000 (15:00 +0200)]
x86/fpu: Decouple fpregs_activate()/fpregs_deactivate() from fpu->fpregs_active

The fpregs_activate()/fpregs_deactivate() are currently called in such a pattern:

if (!fpu->fpregs_active)
fpregs_activate(fpu);

...

if (fpu->fpregs_active)
fpregs_deactivate(fpu);

But note that it's actually safe to call them without checking the flag first.

This further decouples the fpu->fpregs_active flag from actual FPU logic.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-20-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Change fpu->fpregs_active users to fpu->fpstate_active
Ingo Molnar [Sat, 23 Sep 2017 13:00:01 +0000 (15:00 +0200)]
x86/fpu: Change fpu->fpregs_active users to fpu->fpstate_active

We want to simplify the FPU state machine by eliminating fpu->fpregs_active,
and we can do that because the two state flags (::fpregs_active and
::fpstate_active) are set essentially together.

The old lazy FPU switching code used to make a distinction - but there's
no lazy switching code anymore, we always switch in an 'eager' fashion.

Do this by first changing all substantial uses of fpu->fpregs_active
to fpu->fpstate_active and adding a few debug checks to double check
our assumption is correct.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-19-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Split the state handling in fpu__drop()
Ingo Molnar [Sat, 23 Sep 2017 13:00:00 +0000 (15:00 +0200)]
x86/fpu: Split the state handling in fpu__drop()

Prepare fpu__drop() to use fpu->fpregs_active.

There are two distinct usecases for fpu__drop() in this context:
exit_thread() when called for 'current' in exit(), and when called
for another task in fork().

This patch does not change behavior, it only adds a couple of
debug checks and structures the code to make the ->fpregs_active
change more obviously correct.

All the complications will be removed later on.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-18-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Make the fpu state change in fpu__clear() scheduler-atomic
Ingo Molnar [Sat, 23 Sep 2017 12:59:59 +0000 (14:59 +0200)]
x86/fpu: Make the fpu state change in fpu__clear() scheduler-atomic

Do this temporarily only, to make it easier to change the FPU state machine,
in particular this change couples the fpu->fpregs_active and fpu->fpstate_active
states: they are only set/cleared together (as far as the scheduler sees them).

This will be removed by later patches.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-17-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Simplify fpu->fpregs_active use
Ingo Molnar [Sat, 23 Sep 2017 12:59:58 +0000 (14:59 +0200)]
x86/fpu: Simplify fpu->fpregs_active use

The fpregs_active() inline function is pretty pointless - in almost
all the callsites it can be replaced with a direct fpu->fpregs_active
access.

Do so and eliminate the extra layer of obfuscation.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-16-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Flip the parameter order in copy_*_to_xstate()
Ingo Molnar [Sat, 23 Sep 2017 12:59:57 +0000 (14:59 +0200)]
x86/fpu: Flip the parameter order in copy_*_to_xstate()

Make it more consistent with regular memcpy() semantics, where the destination
argument comes first.

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-15-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API
Ingo Molnar [Sat, 23 Sep 2017 12:59:56 +0000 (14:59 +0200)]
x86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-14-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Remove 'ubuf' parameter from the copy_kernel_to_xstate() API
Ingo Molnar [Sat, 23 Sep 2017 12:59:55 +0000 (14:59 +0200)]
x86/fpu: Remove 'ubuf' parameter from the copy_kernel_to_xstate() API

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-13-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate()
Ingo Molnar [Sat, 23 Sep 2017 12:59:54 +0000 (14:59 +0200)]
x86/fpu: Split copy_user_to_xstate() into copy_kernel_to_xstate() & copy_user_to_xstate()

Similar to:

  x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user()

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-12-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Simplify __copy_xstate_to_kernel() return values
Ingo Molnar [Sat, 23 Sep 2017 12:59:53 +0000 (14:59 +0200)]
x86/fpu: Simplify __copy_xstate_to_kernel() return values

__copy_xstate_to_kernel() can only return 0 (because kernel copies cannot fail),
simplify the code throughout.

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-11-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks...
Ingo Molnar [Sat, 23 Sep 2017 12:59:52 +0000 (14:59 +0200)]
x86/fpu: Change 'size_total' parameter to unsigned and standardize the size checks in copy_xstate_to_*()

'size_total' is derived from an unsigned input parameter - and then converted
to 'int' and checked for negative ranges:

if (size_total < 0 || offset < size_total) {

This conversion and the checks are unnecessary obfuscation, reject overly
large requested copy sizes outright and simplify the underlying code.

Reported-by: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-10-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Clarify parameter names in the copy_xstate_to_*() methods
Ingo Molnar [Sat, 23 Sep 2017 12:59:51 +0000 (14:59 +0200)]
x86/fpu: Clarify parameter names in the copy_xstate_to_*() methods

Right now there's a confusing mixture of 'offset' and 'size' parameters:

 - __copy_xstate_to_*() input parameter 'end_pos' not not really an offset,
   but the full size of the copy to be performed.

 - input parameter 'count' to copy_xstate_to_*() shadows that of
   __copy_xstate_to_*()'s 'count' parameter name - but the roles
   are different: the first one is the total number of bytes to
   be copied, while the second one is a partial copy size.

To unconfuse all this, use a consistent set of parameter names:

 - 'size' is the partial copy size within a single xstate component
 - 'size_total' is the total copy requested
 - 'offset_start' is the requested starting offset.
 - 'offset' is the offset within an xstate component.

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-9-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions
Ingo Molnar [Sat, 23 Sep 2017 12:59:50 +0000 (14:59 +0200)]
x86/fpu: Remove the 'start_pos' parameter from the __copy_xstate_to_*() functions

'start_pos' is always 0, so remove it and remove the pointless check of 'pos < 0'
which can not ever be true as 'pos' is unsigned ...

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-8-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Clean up the parameter definitions of copy_xstate_to_*()
Ingo Molnar [Sat, 23 Sep 2017 12:59:49 +0000 (14:59 +0200)]
x86/fpu: Clean up the parameter definitions of copy_xstate_to_*()

Remove pointless 'const' of non-pointer input parameter.

Remove unnecessary parenthesis that shows uncertainty about arithmetic operator precedence.

Clarify copy_xstate_to_user() description.

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-7-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Clean up parameter order in the copy_xstate_to_*() APIs
Ingo Molnar [Sat, 23 Sep 2017 12:59:48 +0000 (14:59 +0200)]
x86/fpu: Clean up parameter order in the copy_xstate_to_*() APIs

Parameter ordering is weird:

  int copy_xstate_to_kernel(unsigned int pos, unsigned int count, void *kbuf, struct xregs_state *xsave);
  int copy_xstate_to_user(unsigned int pos, unsigned int count, void __user *ubuf, struct xregs_state *xsave);

'pos' and 'count', which are attributes of the destination buffer, are listed before the destination
buffer itself ...

List them after the primary arguments instead.

This makes the code more similar to regular memcpy() variant APIs.

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-6-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs
Ingo Molnar [Sat, 23 Sep 2017 12:59:47 +0000 (14:59 +0200)]
x86/fpu: Remove 'kbuf' parameter from the copy_xstate_to_user() APIs

The 'kbuf' parameter is unused in the _user() side of the API, remove it.

This simplifies the code and makes it easier to think about.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-5-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Remove 'ubuf' parameter from the copy_xstate_to_kernel() APIs
Ingo Molnar [Sat, 23 Sep 2017 12:59:46 +0000 (14:59 +0200)]
x86/fpu: Remove 'ubuf' parameter from the copy_xstate_to_kernel() APIs

The 'ubuf' parameter is unused in the _kernel() side of the API, remove it.

This simplifies the code and makes it easier to think about.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-4-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user()
Ingo Molnar [Sat, 23 Sep 2017 12:59:45 +0000 (14:59 +0200)]
x86/fpu: Split copy_xstate_to_user() into copy_xstate_to_kernel() & copy_xstate_to_user()

copy_xstate_to_user() is a weird API - in part due to a bad API inherited
from the regset APIs.

But don't propagate that bad API choice into the FPU code - so as a first
step split the API into kernel and user buffer handling routines.

(Also split the xstate_copyout() internal helper.)

The split API is a dumb duplication that should be obviously correct, the
real splitting will be done in the next patch.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-3-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agox86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate(...
Ingo Molnar [Sat, 23 Sep 2017 12:59:44 +0000 (14:59 +0200)]
x86/fpu: Rename copyin_to_xsaves()/copyout_from_xsaves() to copy_user_to_xstate()/copy_xstate_to_user()

The 'copyin/copyout' nomenclature needlessly departs from what the modern FPU code
uses, which is:

 copy_fpregs_to_fpstate()
 copy_fpstate_to_sigframe()
 copy_fregs_to_user()
 copy_fxregs_to_kernel()
 copy_fxregs_to_user()
 copy_kernel_to_fpregs()
 copy_kernel_to_fregs()
 copy_kernel_to_fxregs()
 copy_kernel_to_xregs()
 copy_user_to_fregs()
 copy_user_to_fxregs()
 copy_user_to_xregs()
 copy_xregs_to_kernel()
 copy_xregs_to_user()

I.e. according to this pattern, the following rename should be done:

  copyin_to_xsaves()    -> copy_user_to_xstate()
  copyout_from_xsaves() -> copy_xstate_to_user()

or, if we want to be pedantic, denote that that the user-space format is ptrace:

  copyin_to_xsaves()    -> copy_user_ptrace_to_xstate()
  copyout_from_xsaves() -> copy_xstate_to_user_ptrace()

But I'd suggest the shorter, non-pedantic name.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-2-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
7 years agoMerge tag 'acpi-4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Sat, 23 Sep 2017 03:40:11 +0000 (17:40 -1000)]
Merge tag 'acpi-4.14-rc2' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix the initialization of resources in the ACPI WDAT watchdog
  driver, a recent regression in the ACPI device properties handling, a
  recent change in behavior causing the ACPI_HANDLE() macro to only work
  for GPL code and create a MAINTAINERS entry for ACPI PMIC drivers in
  order to specify the official reviewers for that code.

  Specifics:

   - Fix the initialization of resources in the ACPI WDAT watchdog
     driver that uses unititialized memory which causes compiler
     warnings to be triggered (Arnd Bergmann).

   - Fix a recent regression in the ACPI device properties handling that
     causes some device properties data to be skipped during enumeration
     (Sakari Ailus).

   - Fix a recent change in behavior that caused the ACPI_HANDLE() macro
     to stop working for non-GPL code which is a problem for the NVidia
     binary graphics driver, for example (John Hubbard).

   - Add a MAINTAINERS entry for the ACPI PMIC drivers to specify the
     official reviewers for that code (Rafael Wysocki)"

* tag 'acpi-4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: properties: Return _DSD hierarchical extension (data) sub-nodes correctly
  ACPI / bus: Make ACPI_HANDLE() work for non-GPL code again
  ACPI / watchdog: properly initialize resources
  ACPI / PMIC: Add code reviewers to MAINTAINERS

7 years agoMerge tag 'pm-4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Linus Torvalds [Sat, 23 Sep 2017 03:28:59 +0000 (17:28 -1000)]
Merge tag 'pm-4.14-rc2' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix a cpufreq regression introduced by recent changes related to
  the generic DT driver, an initialization time memory leak in cpuidle
  on ARM, a PM core bug that may cause system suspend/resume to fail on
  some systems, a request type validation issue in the PM QoS framework
  and two documentation-related issues.

  Specifics:

   - Fix a regression in cpufreq on systems using DT as the source of
     CPU configuration information where two different code paths
     attempt to create the cpufreq-dt device object (there can be only
     one) and fix up the "compatible" matching for some TI platforms on
     top of that (Viresh Kumar, Dave Gerlach).

   - Fix an initialization time memory leak in cpuidle on ARM which
     occurs if the cpuidle driver initialization fails (Stefan Wahren).

   - Fix a PM core function that checks whether or not there are any
     system suspend/resume callbacks for a device, but forgets to check
     legacy callbacks which then may be skipped incorrectly and the
     system may crash and/or the device may become unusable after a
     suspend-resume cycle (Rafael Wysocki).

   - Fix request type validation for latency tolerance PM QoS requests
     which may lead to unexpected behavior (Jan Schönherr).

   - Fix a broken link to PM documentation from a header file and a typo
     in a PM document (Geert Uytterhoeven, Rafael Wysocki)"

* tag 'pm-4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: ti-cpufreq: Support additional am43xx platforms
  ARM: cpuidle: Avoid memleak if init fail
  cpufreq: dt-platdev: Add some missing platforms to the blacklist
  PM: core: Fix device_pm_check_callbacks()
  PM: docs: Drop an excess character from devices.rst
  PM / QoS: Use the correct variable to check the QoS request type
  driver core: Fix link to device power management documentation

7 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Linus Torvalds [Sat, 23 Sep 2017 03:23:41 +0000 (17:23 -1000)]
Merge branch 'for-linus' of git://git./linux/kernel/git/dtor/input

Pull input fixes from Dmitry Torokhov:

 - fixes for two long standing issues (lock up and a crash) in force
   feedback handling in uinput driver

 - tweak to firmware update timing in Elan I2C touchpad driver.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: elan_i2c - extend Flash-Write delay
  Input: uinput - avoid crash when sending FF request to device going away
  Input: uinput - avoid FF flush when destroying device

7 years agoMerge tag 'seccomp-v4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees...
Linus Torvalds [Sat, 23 Sep 2017 02:16:41 +0000 (16:16 -1000)]
Merge tag 'seccomp-v4.14-rc2' of git://git./linux/kernel/git/kees/linux

Pull seccomp updates from Kees Cook:
 "Major additions:

   - sysctl and seccomp operation to discover available actions
     (tyhicks)

   - new per-filter configurable logging infrastructure and sysctl
     (tyhicks)

   - SECCOMP_RET_LOG to log allowed syscalls (tyhicks)

   - SECCOMP_RET_KILL_PROCESS as the new strictest possible action

   - self-tests for new behaviors"

[ This is the seccomp part of the security pull request during the merge
  window that was nixed due to unrelated problems   - Linus ]

* tag 'seccomp-v4.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  samples: Unrename SECCOMP_RET_KILL
  selftests/seccomp: Test thread vs process killing
  seccomp: Implement SECCOMP_RET_KILL_PROCESS action
  seccomp: Introduce SECCOMP_RET_KILL_PROCESS
  seccomp: Rename SECCOMP_RET_KILL to SECCOMP_RET_KILL_THREAD
  seccomp: Action to log before allowing
  seccomp: Filter flag to log all actions except SECCOMP_RET_ALLOW
  seccomp: Selftest for detection of filter flag support
  seccomp: Sysctl to configure actions that are allowed to be logged
  seccomp: Operation for checking if an action is available
  seccomp: Sysctl to display available actions
  seccomp: Provide matching filter for introspection
  selftests/seccomp: Refactor RET_ERRNO tests
  selftests/seccomp: Add simple seccomp overhead benchmark
  selftests/seccomp: Add tests for basic ptrace actions

7 years agoMerge tag '4.14-smb3-fixes-from-recent-test-events-for-stable' of git://git.samba...
Linus Torvalds [Sat, 23 Sep 2017 02:11:48 +0000 (16:11 -1000)]
Merge tag '4.14-smb3-fixes-from-recent-test-events-for-stable' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "Various SMB3 fixes for stable and security improvements from the
  recently completed SMB3/Samba test events

* tag '4.14-smb3-fixes-from-recent-test-events-for-stable' of git://git.samba.org/sfrench/cifs-2.6:
  SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags
  SMB3: handle new statx fields
  SMB: Validate negotiate (to protect against downgrade) even if signing off
  cifs: release auth_key.response for reconnect.
  cifs: release cifs root_cred after exit_cifs
  CIFS: make arrays static const, reduces object code size
  [SMB3] Update session and share information displayed for debugging SMB2/SMB3
  cifs: show 'soft' in the mount options for hard mounts
  SMB3: Warn user if trying to sign connection that authenticated as guest
  SMB3: Fix endian warning
  Fix SMB3.1.1 guest authentication to Samba

7 years agoMerge tag 'ceph-for-4.14-rc2' of git://github.com/ceph/ceph-client
Linus Torvalds [Sat, 23 Sep 2017 02:09:31 +0000 (16:09 -1000)]
Merge tag 'ceph-for-4.14-rc2' of git://github.com/ceph/ceph-client

Pull ceph fixes from Ilya Dryomov:
 "Two small but important fixes: RADOS semantic change in upcoming v12.2.1
  release and a rare NULL dereference in create_session_open_msg()"

* tag 'ceph-for-4.14-rc2' of git://github.com/ceph/ceph-client:
  ceph: avoid panic in create_session_open_msg() if utsname() returns NULL
  libceph: don't allow bidirectional swap of pg-upmap-items

7 years agoSMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags
Steve French [Fri, 22 Sep 2017 06:40:27 +0000 (01:40 -0500)]
SMB3: Don't ignore O_SYNC/O_DSYNC and O_DIRECT flags

Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
7 years agoMerge tag 'pci-v4.14-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
Linus Torvalds [Fri, 22 Sep 2017 23:09:11 +0000 (13:09 -1000)]
Merge tag 'pci-v4.14-fixes-2' of git://git./linux/kernel/git/helgaas/pci

Pull PCI fixes from Bjorn Helgaas:

 - fix endpoint "end of test" interrupt issue (introduced in v4.14-rc1)
   (John Keeping)

 - fix MIPS use-after-free map_irq() issue (introduced in v4.14-rc1)
   (Lorenzo Pieralisi)

* tag 'pci-v4.14-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: endpoint: Use correct "end of test" interrupt
  MIPS: PCI: Move map_irq() hooks out of initdata

7 years agoMerge tag 'iommu-fixes-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 22 Sep 2017 23:06:05 +0000 (13:06 -1000)]
Merge tag 'iommu-fixes-v4.14-rc1' of git://git./linux/kernel/git/joro/iommu

Pull IOMMU fixes from Joerg Roedel:

 - two Kconfig fixes to fix dependencies that cause compile failures
   when they are not fulfilled.

 - a section mismatch fix for Intel VT-d

 - a fix for PCI topology detection in ARM device-tree code

* tag 'iommu-fixes-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/of: Remove PCI host bridge node check
  iommu/qcom: Depend on HAS_DMA to fix compile error
  iommu/vt-d: Fix harmless section mismatch warning
  iommu: Add missing dependencies

7 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
Linus Torvalds [Fri, 22 Sep 2017 23:02:54 +0000 (13:02 -1000)]
Merge git://git./linux/kernel/git/cmetcalf/linux-tile

Pull arch/tile fixes from Chris Metcalf:
 "These are a code cleanup and config cleanup, respectively"

* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  tile: array underflow in setup_maxnodemem()
  tile: defconfig: Cleanup from old Kconfig options

7 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Fri, 22 Sep 2017 23:01:16 +0000 (13:01 -1000)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:

 - #ifdef CONFIG_EFI around __efi_fpsimd_begin/end

 - Assembly code alignment reduced to 4 bytes from 16

 - Ensure the kernel is compiled for LP64 (there are some arm64
   compilers around defaulting to ILP32)

 - Fix arm_pmu_acpi memory leak on the error path

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  drivers/perf: arm_pmu_acpi: Release memory obtained by kasprintf
  arm64: ensure the kernel is compiled for LP64
  arm64: relax assembly code alignment from 16 byte to 4 byte
  arm64: efi: Don't include EFI fpsimd save/restore code in non-EFI kernels

7 years agoSMB3: handle new statx fields
Steve French [Fri, 22 Sep 2017 02:32:29 +0000 (21:32 -0500)]
SMB3: handle new statx fields

We weren't returning the creation time or the two easily supported
attributes (ENCRYPTED or COMPRESSED) for the getattr call to
allow statx to return these fields.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>\
Acked-by: Jeff Layton <jlayton@poochiereds.net>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
7 years agoarch: remove unused *_segments() macros/functions
Tobias Klauser [Fri, 22 Sep 2017 07:42:42 +0000 (09:42 +0200)]
arch: remove unused *_segments() macros/functions

Some architectures define the no-op macros/functions copy_segments,
release_segments and forget_segments. These are used nowhere in the
tree, so removed them.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Vineet Gupta <vgupta@synopsys.com> [for arch/arc]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7 years agoMerge branches 'acpi-pmic', 'acpi-bus', 'acpi-wdat' and 'acpi-properties'
Rafael J. Wysocki [Fri, 22 Sep 2017 21:38:45 +0000 (23:38 +0200)]
Merge branches 'acpi-pmic', 'acpi-bus', 'acpi-wdat' and 'acpi-properties'

* acpi-pmic:
  ACPI / PMIC: Add code reviewers to MAINTAINERS

* acpi-bus:
  ACPI / bus: Make ACPI_HANDLE() work for non-GPL code again

* acpi-wdat:
  ACPI / watchdog: properly initialize resources

* acpi-properties:
  ACPI: properties: Return _DSD hierarchical extension (data) sub-nodes correctly

7 years agoMerge branches 'pm-cpufreq' and 'pm-cpuidle'
Rafael J. Wysocki [Fri, 22 Sep 2017 20:45:54 +0000 (22:45 +0200)]
Merge branches 'pm-cpufreq' and 'pm-cpuidle'

* pm-cpufreq:
  cpufreq: ti-cpufreq: Support additional am43xx platforms
  cpufreq: dt-platdev: Add some missing platforms to the blacklist

* pm-cpuidle:
  ARM: cpuidle: Avoid memleak if init fail

7 years agoMerge branches 'pm-core', 'pm-qos' and 'pm-docs'
Rafael J. Wysocki [Fri, 22 Sep 2017 20:45:28 +0000 (22:45 +0200)]
Merge branches 'pm-core', 'pm-qos' and 'pm-docs'

* pm-core:
  PM: core: Fix device_pm_check_callbacks()

* pm-qos:
  PM / QoS: Use the correct variable to check the QoS request type

* pm-docs:
  PM: docs: Drop an excess character from devices.rst
  driver core: Fix link to device power management documentation

7 years agoInput: elan_i2c - extend Flash-Write delay
KT Liao [Fri, 22 Sep 2017 17:00:57 +0000 (10:00 -0700)]
Input: elan_i2c - extend Flash-Write delay

The original 20ms delay is only marginally enough delay after a block write
operation during firmware update. Let's increase the delay to ensure that
the controller finishes up storing the page to avoid failures in the
firmware updates.

Signed-off-by: KT Liao <kt.liao@emc.com.tw>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
7 years agoMerge tag 'for-linus-4.14b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 22 Sep 2017 16:40:47 +0000 (06:40 -1000)]
Merge tag 'for-linus-4.14b-rc2-tag' of git://git./linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:
 "A fix for a missing __init annotation and two cleanup patches"

* tag 'for-linus-4.14b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen, arm64: drop dummy lookup_address()
  xen: don't compile pv-specific parts if XEN_PV isn't configured
  xen: x86: mark xen_find_pt_base as __init

7 years agoMerge tag 'powerpc-4.14-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Fri, 22 Sep 2017 16:39:09 +0000 (06:39 -1000)]
Merge tag 'powerpc-4.14-3' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "It turns out our single-fix pull from last week was too good to be
  true. I missed a few fixes in that pull that had already come in
  because I was on leave, but also we hadn't found the bugs yet. So this
  week it's a bit bigger, though not ridiculous. Hopefully things will
  settle down from here on.

  Four fixes for the new instruction emulation code. A fix for CPU
  offline on bare metal machines when certain idle states are not
  supported, and a fix for a device_node refcounting oops during CPU
  hotplug, caused by recent changes.

  Going to stable are a fix for an oops during core dump on machines
  that have TM (Transactional Memory) disabled. Reordering some EEH
  initialisation to avoid trashing memory, and another device_node
  refcounting fix.

  And a few other minor things.

 Thanks to: Anton Blanchard, Benjamin Herrenschmidt, Cyril Bur, Gautham
 R. Shenoy, Gustavo Romero, Kamalesh Babulal, Matthew Weber, Matt Weber,
 Naveen N. Rao, Nicholas Piggin, Pavithra Prakash, Ravi Bangoria, Ronak
 Desai, Scott Wood, Tyrel Datwyler"

* tag 'powerpc-4.14-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/pseries: Fix parent_dn reference leak in add_dt_node()
  powerpc/pseries: Fix "OF: ERROR: Bad of_node_put() on /cpus" during DLPAR
  powerpc/eeh: Create PHB PEs after EEH is initialized
  powerpc/kprobes: Update optprobes to use emulate_update_regs()
  powerpc/powernv: Clear LPCR[PECE1] via stop-api only for deep state offline
  powerpc/sstep: mullw should calculate a 64 bit signed result
  powerpc/sstep: Fix issues with mcrf
  powerpc/sstep: Fix issues with set_cr0()
  powerpc/tm: Flush TM only if CPU has TM feature
  powerpc/sysrq: Fix oops whem ppmu is not registered
  powerpc/configs: Update for CONFIG_SND changes
  powerpc/e6500: Update machine check for L1D cache err

7 years agoMerge branch '4.14-fixes' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Linus Torvalds [Fri, 22 Sep 2017 16:37:50 +0000 (06:37 -1000)]
Merge branch '4.14-fixes' of git://git.linux-mips.org/ralf/upstream-linus

Pull MIPS fixes from Ralf Baechle:

 - Fix a build error on MSP71xx which used to rely on somehow magically
   <asm/setup.h> being pulled in which no longer happens.

 - Fix the __write_64bit_c0_split inline assembler where there was the
   theoretical possibility of GCC interpret the constraints such that
   bad code could result.

 - A __init was causing section mismatch errors on Alchemy. Just to be
   on the safe side, Manuel's patch does away with all of them.

 - Fix perf event init.

* '4.14-fixes' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: PCI: fix pcibios_map_irq section mismatch
  MIPS: Fix input modify in __write_64bit_c0_split()
  MIPS: MSP71xx: Include asm/setup.h
  MIPS: Fix perf event init

7 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Linus Torvalds [Fri, 22 Sep 2017 16:32:07 +0000 (06:32 -1000)]
Merge branch 'for-linus' of git://git./linux/kernel/git/s390/linux

Pull s390 fixes from Martin Schwidefsky:

 - A couple of bug fixes: memory management, perf, cio, dasd and
   scm_blk.

 - A larger change in regard to the CPU topology to improve performance
   for systems running under z/VM or KVM.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/topology: enable / disable topology dynamically
  s390/topology: alternative topology for topology-less machines
  s390/mm: fix write access check in gup_huge_pmd()
  s390/mm: make pmdp_invalidate() do invalidation only
  s390/cio: recover from bad paths
  s390/scm_blk: consistently use blk_status_t as error type
  s390/dasd: fix race during dasd initialization
  s390/perf: fix bug when creating per-thread event

7 years agoMerge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Linus Torvalds [Fri, 22 Sep 2017 16:15:27 +0000 (06:15 -1000)]
Merge branch 'linus' of git://git./linux/kernel/git/herbert/crypto-2.6

Pull crypto fixes from Herbert Xu:
 - Fix compiler warnings in inside-secure
 - Fix LS1021A support in caam
 - Avoid using RBP in x86 crypto code
 - Fix bug in talitos that prevents hashing with algif
 - Fix bugs talitos hashing code that cause incorrect hash result
 - Fix memory freeing path bug in drbg
 - Fix af_alg crash when two SG lists are chained

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: af_alg - update correct dst SGL entry
  crypto: caam - fix LS1021A support on ARMv7 multiplatform kernel
  crypto: inside-secure - fix gcc-4.9 warnings
  crypto: talitos - Don't provide setkey for non hmac hashing algs
  crypto: talitos - fix hashing
  crypto: talitos - fix sha224
  crypto: x86/twofish - Fix RBP usage
  crypto: sha512-avx2 - Fix RBP usage
  crypto: x86/sha256-ssse3 - Fix RBP usage
  crypto: x86/sha256-avx2 - Fix RBP usage
  crypto: x86/sha256-avx - Fix RBP usage
  crypto: x86/sha1-ssse3 - Fix RBP usage
  crypto: x86/sha1-avx2 - Fix RBP usage
  crypto: x86/des3_ede - Fix RBP usage
  crypto: x86/cast6 - Fix RBP usage
  crypto: x86/cast5 - Fix RBP usage
  crypto: x86/camellia - Fix RBP usage
  crypto: x86/blowfish - Fix RBP usage
  crypto: drbg - fix freeing of resources

7 years agodrivers/perf: arm_pmu_acpi: Release memory obtained by kasprintf
Arvind Yadav [Wed, 20 Sep 2017 06:56:38 +0000 (12:26 +0530)]
drivers/perf: arm_pmu_acpi: Release memory obtained by kasprintf

Free memory region, if arm_pmu_acpi_probe is not successful.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
7 years agoiommu/of: Remove PCI host bridge node check
Robin Murphy [Thu, 21 Sep 2017 10:20:58 +0000 (11:20 +0100)]
iommu/of: Remove PCI host bridge node check

of_pci_iommu_init() tries to be clever and stop its alias walk at the
device represented by master_np, in case of weird PCI topologies where
the bridge to the IOMMU and the rest of the system is not at the root.
It turns out this is a bit short-sighted, since there are plenty of
other callers of pci_for_each_dma_alias() which would also need the same
behaviour in that situation, and the only platform so far with such a
topology (Cavium ThunderX2) already solves it more generally via a PCI
quirk. As this check is effectively redundant, and returning a boolean
value as an int is a bit broken anyway, let's just get rid of it.

Reported-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Fixes: d87beb749281 ("iommu/of: Handle PCI aliases properly")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
7 years agoMerge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdim...
Linus Torvalds [Fri, 22 Sep 2017 01:51:19 +0000 (15:51 -1000)]
Merge branch 'libnvdimm-fixes' of git://git./linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm fixes from Dan Williams:
 "A crash fix and corresponding regression test enabling for the crash
  scenario. The unit test for this crash is available in ndctl-v58.2.

  This branch has received a build success notification from the
  0day-kbuild robot over 148 configs. The fix is tagged for -stable /
  backport to 4.13"

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  libnvdimm, namespace: fix btt claim class crash
  tools/testing/nvdimm: disable labels for nfit_test.1

7 years agoInput: uinput - avoid crash when sending FF request to device going away
Dmitry Torokhov [Wed, 6 Sep 2017 23:22:59 +0000 (16:22 -0700)]
Input: uinput - avoid crash when sending FF request to device going away

If FF request comes in while uinput device is going away,
uinput_request_send() will fail with -ENODEV, and uinput_request_submit()
will attempt to mark the slot as unused by calling uinput_request_done().
Unfortunately in this case we haven't initialized request->done completion
yet, and we get a crash:

[   39.402036] BUG: spinlock bad magic on CPU#1, fftest/3108
[   39.402046]  lock: 0xffff88006a93bb00, .magic: 00000000, .owner: /39, .owner_cpu: 1217155072
[   39.402055] CPU: 1 PID: 3108 Comm: fftest Tainted: G        W 4.13.0+ #15
[   39.402059] Hardware name: LENOVO 20HQS0EG02/20HQS0EG02, BIOS N1MET37W (1.22 ) 07/04/2017
[   39.402064]  0000000000000086 f0fad82f3ceaa120 ffff88006a93b9a0 ffffffff9de941bb
[   39.402077]  ffff88026df8ae00 ffff88006a93bb00 ffff88006a93b9c0 ffffffff9dca62b7
[   39.402088]  ffff88006a93bb00 ffff88006a93baf8 ffff88006a93b9e0 ffffffff9dca62e7
[   39.402099] Call Trace:
[   39.402112]  [<ffffffff9de941bb>] dump_stack+0x4d/0x63
[   39.402123]  [<ffffffff9dca62b7>] spin_dump+0x97/0x9c
[   39.402130]  [<ffffffff9dca62e7>] spin_bug+0x2b/0x2d
[   39.402138]  [<ffffffff9dca6373>] do_raw_spin_lock+0x28/0xfd
[   39.402147]  [<ffffffff9e3055cd>] _raw_spin_lock_irqsave+0x19/0x1f
[   39.402154]  [<ffffffff9dca05b7>] complete+0x1d/0x48
[   39.402162]  [<ffffffffc04f30af>] 0xffffffffc04f30af
[   39.402167]  [<ffffffffc04f468c>] 0xffffffffc04f468c
[   39.402177]  [<ffffffff9dd59c16>] ? __slab_free+0x22f/0x359
[   39.402184]  [<ffffffff9dcc13e9>] ? tk_clock_read+0xc/0xe
[   39.402189]  [<ffffffffc04f471f>] 0xffffffffc04f471f
[   39.402195]  [<ffffffff9dc9ffe5>] ? __wake_up+0x44/0x4b
[   39.402200]  [<ffffffffc04f3240>] ? 0xffffffffc04f3240
[   39.402207]  [<ffffffff9e0f57f3>] erase_effect+0xa1/0xd2
[   39.402214]  [<ffffffff9e0f58c6>] input_ff_flush+0x43/0x5c
[   39.402219]  [<ffffffffc04f32ad>] 0xffffffffc04f32ad
[   39.402227]  [<ffffffff9e0f174f>] input_flush_device+0x3d/0x51
[   39.402234]  [<ffffffff9e0f69ae>] evdev_flush+0x49/0x5c
[   39.402243]  [<ffffffff9dd62d6e>] filp_close+0x3f/0x65
[   39.402253]  [<ffffffff9dd7dcf7>] put_files_struct+0x66/0xc1
[   39.402261]  [<ffffffff9dd7ddeb>] exit_files+0x47/0x4e
[   39.402270]  [<ffffffff9dc6b329>] do_exit+0x483/0x969
[   39.402278]  [<ffffffff9dc73211>] ? recalc_sigpending_tsk+0x3d/0x44
[   39.402285]  [<ffffffff9dc6c7a2>] do_group_exit+0x42/0xb0
[   39.402293]  [<ffffffff9dc767e1>] get_signal+0x58d/0x5bf
[   39.402300]  [<ffffffff9dc03701>] do_signal+0x37/0x53e
[   39.402307]  [<ffffffff9e0f8401>] ? evdev_ioctl_handler+0xac8/0xb04
[   39.402314]  [<ffffffff9e0f8464>] ? evdev_ioctl+0x10/0x12
[   39.402321]  [<ffffffff9dd74cfa>] ? do_vfs_ioctl+0x42e/0x501
[   39.402328]  [<ffffffff9dc0170e>] prepare_exit_to_usermode+0x66/0x90
[   39.402333]  [<ffffffff9dc0181b>] syscall_return_slowpath+0xe3/0xec
[   39.402339]  [<ffffffff9e305b7b>] int_ret_from_sys_call+0x25/0x8f

While we could solve this by simply initializing the completion earlier, we
are better off rearranging the code a bit so we avoid calling complete() on
requests that we did not send out. This patch consolidates marking request
slots as free in one place (in uinput_request_submit(), the same place
where we acquire them) and having everyone else simply signal completion
of the requests.

Fixes: 00ce756ce53a ("Input: uinput - mark failed submission requests as free")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
7 years agoInput: uinput - avoid FF flush when destroying device
Dmitry Torokhov [Sat, 2 Sep 2017 00:13:43 +0000 (17:13 -0700)]
Input: uinput - avoid FF flush when destroying device

Normally, when input device supporting force feedback effects is being
destroyed, we try to "flush" currently playing effects, so that the
physical device does not continue vibrating (or executing other effects).
Unfortunately this does not work well for uinput as flushing of the effects
deadlocks with the destroy action:

- if device is being destroyed because the file descriptor is being closed,
  then there is noone to even service FF requests;

- if device is being destroyed because userspace sent UI_DEV_DESTROY,
  while theoretically it could be possible to service FF requests,
  userspace is unlikely to do so (they'd need to make sure FF handling
  happens on a separate thread) even if kernel solves the issue with FF
  ioctls deadlocking with UI_DEV_DESTROY ioctl on udev->mutex.

To avoid lockups like the one below, let's install a custom input device
flush handler, and avoid trying to flush force feedback effects when we
destroying the device, and instead rely on uinput to shut off the device
properly.

NMI watchdog: Watchdog detected hard LOCKUP on cpu 3
...
 <<EOE>>  [<ffffffff817a0307>] _raw_spin_lock_irqsave+0x37/0x40
 [<ffffffff810e633d>] complete+0x1d/0x50
 [<ffffffffa00ba08c>] uinput_request_done+0x3c/0x40 [uinput]
 [<ffffffffa00ba587>] uinput_request_submit.part.7+0x47/0xb0 [uinput]
 [<ffffffffa00bb62b>] uinput_dev_erase_effect+0x5b/0x76 [uinput]
 [<ffffffff815d91ad>] erase_effect+0xad/0xf0
 [<ffffffff815d929d>] flush_effects+0x4d/0x90
 [<ffffffff815d4cc0>] input_flush_device+0x40/0x60
 [<ffffffff815daf1c>] evdev_cleanup+0xac/0xc0
 [<ffffffff815daf5b>] evdev_disconnect+0x2b/0x60
 [<ffffffff815d74ac>] __input_unregister_device+0xac/0x150
 [<ffffffff815d75f7>] input_unregister_device+0x47/0x70
 [<ffffffffa00bac45>] uinput_destroy_device+0xb5/0xc0 [uinput]
 [<ffffffffa00bb2de>] uinput_ioctl_handler.isra.9+0x65e/0x740 [uinput]
 [<ffffffff811231ab>] ? do_futex+0x12b/0xad0
 [<ffffffffa00bb3f8>] uinput_ioctl+0x18/0x20 [uinput]
 [<ffffffff81241248>] do_vfs_ioctl+0x298/0x480
 [<ffffffff81337553>] ? security_file_ioctl+0x43/0x60
 [<ffffffff812414a9>] SyS_ioctl+0x79/0x90
 [<ffffffff817a04ee>] entry_SYSCALL_64_fastpath+0x12/0x71

Reported-by: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
Reported-by: Clément VUCHENER <clement.vuchener@gmail.com>
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=193741
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
7 years agoMerge tag 'kbuild-fixes-v4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masah...
Linus Torvalds [Thu, 21 Sep 2017 16:01:03 +0000 (06:01 -1000)]
Merge tag 'kbuild-fixes-v4.14' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:
 "Here are some early Kbuild fixes.

  The in-kernel firmware was removed during the previous merge window.
  Since then, some bug reports of broken rpm building are flying in ML.
  We need to fix it now.

  Summary:

   - remove firmware install from rpm-pkg / deb-pkg

   - fix mismatch between release number and UTS_VERSION for rpm-pkg"

* tag 'kbuild-fixes-v4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kbuild: rpm-pkg: fix version number handling
  kbuild: deb-pkg: remove firmware package support
  kbuild: rpm-pkg: delete firmware_install to fix build error

7 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Linus Torvalds [Thu, 21 Sep 2017 15:57:50 +0000 (05:57 -1000)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs

Pull misc fixes from Al Viro:
 "A couple of regression fixes, one for this merge window, one for the
  previous cycle"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ipc/shm: Fix order of parameters when calling copy_compat_shmid_to_user
  iov_iter: fix page_copy_sane for compound pages

7 years agoMerge tag 'mtd/fixes-for-4.14-rc2' of git://git.infradead.org/linux-mtd
Linus Torvalds [Thu, 21 Sep 2017 15:55:20 +0000 (05:55 -1000)]
Merge tag 'mtd/fixes-for-4.14-rc2' of git://git.infradead.org/linux-mtd

Pull mtd fixes from Boris Brezillon:
 "SPI NOR:
   - Fix the SFDP parsing code (bugs reported by Geert Uytterhoeven)

  NAND:
   - Fix a resource leak in the lpc32xx_mlc driver
   - Fix a build warning in the core"

* tag 'mtd/fixes-for-4.14-rc2' of git://git.infradead.org/linux-mtd:
  mtd: nand: remove unused blockmask variable
  mtd: nand: lpc32xx_mlc: Fix an error handling path in lpc32xx_nand_probe()
  mtd: spi-nor: fix DMA unsafe buffer issue in spi_nor_read_sfdp()
  mtd: spi-nor: Check consistency of the memory size extracted from the SFDP

7 years agoMerge tag 'drm-fixes-for-v4.14-rc2' of git://people.freedesktop.org/~airlied/linux
Linus Torvalds [Thu, 21 Sep 2017 15:52:36 +0000 (05:52 -1000)]
Merge tag 'drm-fixes-for-v4.14-rc2' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "amdkfd, i915 and exynos fixes.

  I've ended up on unplanned + planned leave this week, but there were
  some fixes I decided to dequeue, some amdkfd bits missed the next pull
  but they are pretty trivial, so I included them.

  I'm not sure I'll see much else for rc2, lots of people are at XDC"

* tag 'drm-fixes-for-v4.14-rc2' of git://people.freedesktop.org/~airlied/linux:
  drm/exynos/hdmi: Fix unsafe list iteration
  drm: exynos: include linux/irq.h
  drm/exynos: Fix suspend/resume support
  drm/exynos: Fix locking in the suspend/resume paths
  drm/i915: Remove unused 'in_vbl' from i915_get_crtc_scanoutpos()
  drm/i915/cnp: set min brightness from VBT
  Revert "drm/i915/bxt: Disable device ready before shutdown command"
  drm/i915/bxt: set min brightness from VBT
  drm/i915: Fix an error handling in 'intel_framebuffer_init()'
  drm/i915/gvt: Fix incorrect PCI BARs reporting
  drm/amdkfd: pass queue's mqd when destroying mqd
  drm/amdkfd: remove memset before memcpy
  uapi linux/kfd_ioctl.h: only use __u32 and __u64

7 years agoMerge tag 'dma-mapping-4.14-2' of git://git.infradead.org/users/hch/dma-mapping
Linus Torvalds [Thu, 21 Sep 2017 15:51:03 +0000 (05:51 -1000)]
Merge tag 'dma-mapping-4.14-2' of git://git.infradead.org/users/hch/dma-mapping

Pull dma mapping fix from Christoph Hellwig:
 "A fix for a fix that went in this merge window from Arnd"

* tag 'dma-mapping-4.14-2' of git://git.infradead.org/users/hch/dma-mapping:
  dma-coherent: fix rmem_dma_device_init regression

7 years agoMIPS: PCI: fix pcibios_map_irq section mismatch
Manuel Lauss [Tue, 12 Sep 2017 18:36:28 +0000 (20:36 +0200)]
MIPS: PCI: fix pcibios_map_irq section mismatch

Drop  the __init from pcibios_map_irq() to make this section mis-
match go away:

WARNING: vmlinux.o(.text+0x56acd4): Section mismatch in reference from the function pcibios_scanbus() to the function .init.text:pcibios_map_irq()
The function pcibios_scanbus() references
the function __init pcibios_map_irq().
This is often because pcibios_scanbus lacks a __init
annotation or the annotation of pcibios_map_irq is wrong.

Run-Tested only on Alchemy.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17267/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
7 years agoMIPS: Fix input modify in __write_64bit_c0_split()
James Hogan [Tue, 19 Sep 2017 13:11:22 +0000 (14:11 +0100)]
MIPS: Fix input modify in __write_64bit_c0_split()

The inline asm in __write_64bit_c0_split() modifies the 64-bit input
operand by shifting the high register left by 32, and constructing the
full 64-bit value in the low register (even on a 32-bit kernel), so if
that value is used again it could cause breakage as GCC would assume the
registers haven't changed when they have.

To quote the GCC extended asm documentation:
> Warning: Do not modify the contents of input-only operands (except for
> inputs tied to outputs). The compiler assumes that on exit from the
> asm statement these operands contain the same values as they had
> before executing the statement.

Avoid modifying the input by using a temporary variable as an output
which is modified instead of the input and not otherwise used. The asm
is always __volatile__ so GCC shouldn't optimise it out. The low
register of the temporary output is written before the high register of
the input is read, so we have two constraint alternatives, one where
both use the same registers (for when the input value isn't subsequently
used), and one with an early clobber on the output in case the low
output uses the same register as the high input. This allows the
resulting assembly to remain mostly unchanged.

A diff of a MIPS32r6 kernel reveals only three differences, two in
relation to write_c0_r10k_diag() in cpu_probe() (register allocation
rearranged slightly but otherwise identical), and one in relation to
write_c0_cvmmemctl2() in kvm_vz_local_flush_guesttlb_all(), but the
octeon CPU is only supported on 64-bit kernels where
__write_64bit_c0_split() isn't used so that shouldn't matter in
practice. So there currently doesn't appear to be anything broken by
this bug.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17315/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
7 years agoMIPS: MSP71xx: Include asm/setup.h
Arnd Bergmann [Mon, 18 Sep 2017 15:55:24 +0000 (17:55 +0200)]
MIPS: MSP71xx: Include asm/setup.h

msp71xx_defconfig can not be built at the in v4.14-rc1

arch/mips/pmcs-msp71xx/msp_smp.c:72:2: error: implicit declaration of function 'set_vi_handler' [-Werror=implicit-function-declaration]

I don't know what caused the regression, but including the right
header is the obvious fix.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/17309/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
7 years agopowerpc/pseries: Fix parent_dn reference leak in add_dt_node()
Tyrel Datwyler [Wed, 20 Sep 2017 21:02:52 +0000 (17:02 -0400)]
powerpc/pseries: Fix parent_dn reference leak in add_dt_node()

A reference to the parent device node is held by add_dt_node() for the
node to be added. If the call to dlpar_configure_connector() fails
add_dt_node() returns ENOENT and that reference is not freed.

Add a call to of_node_put(parent_dn) prior to bailing out after a
failed dlpar_configure_connector() call.

Fixes: 8d5ff320766f ("powerpc/pseries: Make dlpar_configure_connector parent node aware")
Cc: stable@vger.kernel.org # v3.12+
Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/pseries: Fix "OF: ERROR: Bad of_node_put() on /cpus" during DLPAR
Tyrel Datwyler [Wed, 20 Sep 2017 21:02:51 +0000 (17:02 -0400)]
powerpc/pseries: Fix "OF: ERROR: Bad of_node_put() on /cpus" during DLPAR

Commit 215ee763f8cb ("powerpc: pseries: remove dlpar_attach_node
dependency on full path") reworked dlpar_attach_node() to no longer
look up the parent node "/cpus", but instead to have the parent node
passed by the caller in the function parameter list.

As a result dlpar_attach_node() is no longer responsible for freeing
the reference to the parent node. However, commit 215ee763f8cb failed
to remove the of_node_put(parent) call in dlpar_attach_node(), or to
take into account that the reference to the parent in the caller
dlpar_cpu_add() needs to be held until after dlpar_attach_node()
returns.

As a result doing repeated cpu add/remove dlpar operations will
eventually result in the following error:

  OF: ERROR: Bad of_node_put() on /cpus
  CPU: 0 PID: 10896 Comm: drmgr Not tainted 4.13.0-autotest #1
  Call Trace:
   dump_stack+0x15c/0x1f8 (unreliable)
   of_node_release+0x1a4/0x1c0
   kobject_put+0x1a8/0x310
   kobject_del+0xbc/0xf0
   __of_detach_node_sysfs+0x144/0x210
   of_detach_node+0xf0/0x180
   dlpar_detach_node+0xc4/0x120
   dlpar_cpu_remove+0x280/0x560
   dlpar_cpu_release+0xbc/0x1b0
   arch_cpu_release+0x6c/0xb0
   cpu_release_store+0xa0/0x100
   dev_attr_store+0x68/0xa0
   sysfs_kf_write+0xa8/0xf0
   kernfs_fop_write+0x2cc/0x400
   __vfs_write+0x5c/0x340
   vfs_write+0x1a8/0x3d0
   SyS_write+0xa8/0x1a0
   system_call+0x58/0x6c

Fix the issue by removing the of_node_put(parent) call from
dlpar_attach_node(), and ensuring that the reference to the parent
node is properly held and released by the caller dlpar_cpu_add().

Fixes: 215ee763f8cb ("powerpc: pseries: remove dlpar_attach_node dependency on full path")
Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
[mpe: Add a comment in the code and frob the change log slightly]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agopowerpc/eeh: Create PHB PEs after EEH is initialized
Benjamin Herrenschmidt [Thu, 7 Sep 2017 06:35:40 +0000 (16:35 +1000)]
powerpc/eeh: Create PHB PEs after EEH is initialized

Otherwise we end up not yet having computed the right diag data size
on powernv where EEH initialization is delayed, thus causing memory
corruption later on when calling OPAL.

Fixes: 5cb1f8fdddb7 ("powerpc/powernv/pci: Dynamically allocate PHB diag data")
Cc: stable@vger.kernel.org # v4.13+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agoipc/shm: Fix order of parameters when calling copy_compat_shmid_to_user
Will Deacon [Mon, 18 Sep 2017 16:47:38 +0000 (17:47 +0100)]
ipc/shm: Fix order of parameters when calling copy_compat_shmid_to_user

Commit 553f770ef71b ("ipc: move compat shmctl to native") moved the
compat IPC syscall handling into ipc/shm.c and refactored the struct
accessors in the process. Unfortunately, the call to
copy_compat_shmid_to_user when handling a compat {IPC,SHM}_STAT command
gets the arguments the wrong way round, passing a kernel stack address
as the user buffer (destination) and the user buffer as the kernel stack
address (source).

This patch fixes the parameter ordering so the buffers are accessed
correctly.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
7 years agoiov_iter: fix page_copy_sane for compound pages
Petar Penkov [Tue, 29 Aug 2017 18:20:32 +0000 (11:20 -0700)]
iov_iter: fix page_copy_sane for compound pages

Issue is that if the data crosses a page boundary inside a compound
page, this check will incorrectly trigger a WARN_ON.

To fix this, compute the order using the head of the compound page and
adjust the offset to be relative to that head.

Fixes: 72e809ed81ed ("iov_iter: sanity checks for copy to/from page
primitives")

Signed-off-by: Petar Penkov <ppenkov@google.com>
CC: Al Viro <viro@zeniv.linux.org.uk>
CC: Eric Dumazet <edumazet@google.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
7 years agoSMB: Validate negotiate (to protect against downgrade) even if signing off
Steve French [Thu, 21 Sep 2017 00:57:18 +0000 (19:57 -0500)]
SMB: Validate negotiate (to protect against downgrade) even if signing off

As long as signing is supported (ie not a guest user connection) and
connection is SMB3 or SMB3.02, then validate negotiate (protect
against man in the middle downgrade attacks).  We had been doing this
only when signing was required, not when signing was just enabled,
but this more closely matches recommended SMB3 behavior and is
better security.  Suggested by Metze.

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Jeremy Allison <jra@samba.org>
Acked-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
7 years agocifs: release auth_key.response for reconnect.
Shu Wang [Fri, 8 Sep 2017 10:48:33 +0000 (18:48 +0800)]
cifs: release auth_key.response for reconnect.

There is a race that cause cifs reconnect in cifs_mount,
- cifs_mount
  - cifs_get_tcp_session
    - [ start thread cifs_demultiplex_thread
      - cifs_read_from_socket: -ECONNABORTED
        - DELAY_WORK smb2_reconnect_server ]
  - cifs_setup_session
  - [ smb2_reconnect_server ]

auth_key.response was allocated in cifs_setup_session, and
will release when the session destoried. So when session re-
connect, auth_key.response should be check and released.

Tested with my system:
CIFS VFS: Free previous auth_key.response = ffff8800320bbf80

A simple auth_key.response allocation call trace:
- cifs_setup_session
- SMB2_sess_setup
- SMB2_sess_auth_rawntlmssp_authenticate
- build_ntlmssp_auth_blob
- setup_ntlmv2_rsp

Signed-off-by: Shu Wang <shuwang@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
7 years agocifs: release cifs root_cred after exit_cifs
Shu Wang [Thu, 7 Sep 2017 08:03:27 +0000 (16:03 +0800)]
cifs: release cifs root_cred after exit_cifs

memory leak was found by kmemleak. exit_cifs_spnego
should be called before cifs module removed, or
cifs root_cred will not be released.

kmemleak report:
unreferenced object 0xffff880070a3ce40 (size 192):
  backtrace:
     kmemleak_alloc+0x4a/0xa0
     kmem_cache_alloc+0xc7/0x1d0
     prepare_kernel_cred+0x20/0x120
     init_cifs_spnego+0x2d/0x170 [cifs]
     0xffffffffc07801f3
     do_one_initcall+0x51/0x1b0
     do_init_module+0x60/0x1fd
     load_module+0x161e/0x1b60
     SYSC_finit_module+0xa9/0x100
     SyS_finit_module+0xe/0x10

Signed-off-by: Shu Wang <shuwang@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
7 years agoCIFS: make arrays static const, reduces object code size
Colin Ian King [Tue, 19 Sep 2017 15:27:39 +0000 (16:27 +0100)]
CIFS: make arrays static const, reduces object code size

Don't populate the read-only arrays types[] on the stack, instead make
them both static const.  Makes the object code smaller by over 200 bytes:

Before:
   text    data     bss     dec     hex filename
 111503   37696     448  149647   2488f fs/cifs/file.o

After:
   text    data     bss     dec     hex filename
 111140   37856     448  149444   247c4 fs/cifs/file.o

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
7 years agoMerge tag 'exynos-drm-fixes-for-v4.14-rc1' of git://git.kernel.org/pub/scm/linux...
Dave Airlie [Wed, 20 Sep 2017 22:02:39 +0000 (08:02 +1000)]
Merge tag 'exynos-drm-fixes-for-v4.14-rc1' of git://git./linux/kernel/git/daeinki/drm-exynos into drm-fixes

- fix suspend/resume issues.
- fix memory corruption detected by kasan.
- fix build error on x86.

* tag 'exynos-drm-fixes-for-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos:
  drm/exynos/hdmi: Fix unsafe list iteration
  drm: exynos: include linux/irq.h
  drm/exynos: Fix suspend/resume support
  drm/exynos: Fix locking in the suspend/resume paths

7 years agoMerge tag 'drm-intel-fixes-2017-09-20' of git://anongit.freedesktop.org/git/drm-intel...
Dave Airlie [Wed, 20 Sep 2017 22:02:21 +0000 (08:02 +1000)]
Merge tag 'drm-intel-fixes-2017-09-20' of git://anongit.freedesktop.org/git/drm-intel into drm-fixes

drm/i915 fixes for 4.14-rc1

Couple fixes for stable:

- Fix MIPI panels on BXT.
- Fix PCI BARs information on GVT.

Plus other fixes:

- Fix minimal brightness for BXT, GLK, CFL and CNL.
- Fix compilation warning: unused in_vbl
- Fix error handling in intel_framebuffer_init

* tag 'drm-intel-fixes-2017-09-20' of git://anongit.freedesktop.org/git/drm-intel:
  drm/i915: Remove unused 'in_vbl' from i915_get_crtc_scanoutpos()
  drm/i915/cnp: set min brightness from VBT
  Revert "drm/i915/bxt: Disable device ready before shutdown command"
  drm/i915/bxt: set min brightness from VBT
  drm/i915: Fix an error handling in 'intel_framebuffer_init()'
  drm/i915/gvt: Fix incorrect PCI BARs reporting

7 years ago[SMB3] Update session and share information displayed for debugging SMB2/SMB3
Steve French [Wed, 20 Sep 2017 21:46:49 +0000 (16:46 -0500)]
[SMB3] Update session and share information displayed for debugging SMB2/SMB3

We were not displaying some key fields (session status and capabilities and
whether guest authenticated) for SMB2/SMB3 session in /proc/fs/cifs/DebugData.

This is needed for real world triage of problems with the (now much more
common) SMB3 mounts.

Signed-off-by: Steve French <smfrench@gmail.com>
7 years agoPCI: endpoint: Use correct "end of test" interrupt
John Keeping [Wed, 20 Sep 2017 18:56:06 +0000 (13:56 -0500)]
PCI: endpoint: Use correct "end of test" interrupt

pci_epf_test_raise_irq() reads the interrupt to use for the response from
reg->command, but this has been cleared at the beginning of the command
handler so the value is always zero at this point.

Instead, extract the interrupt index before handling the command and then
pass the requested interrupt into pci_epf_test_raise_irq().  This allows us
to remove the specific code to extract the interrupt for
COMMAND_RAISE_MSI_IRQ since it is now handled in common code.

Fixes: 3ecf3232c54c ("PCI: endpoint: Do not reset *command* inadvertently")
Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
7 years agoMerge tag 'trace-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
Linus Torvalds [Wed, 20 Sep 2017 16:38:07 +0000 (06:38 -1000)]
Merge tag 'trace-v4.14-rc1' of git://git./linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "This includes three minor fixes.

    - Have writing to trace file clear the irqsoff (and friends) tracer

    - trace_pipe behavior for instance buffers was different than top
      buffer

    - Show a message of why mmiotrace doesn't start from commandline"

* tag 'trace-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Fix trace_pipe behavior for instance traces
  tracing: Ignore mmiotrace from kernel commandline
  tracing: Erase irqsoff trace with empty write

7 years agokbuild: rpm-pkg: fix version number handling
Masahiro Yamada [Wed, 20 Sep 2017 13:01:26 +0000 (22:01 +0900)]
kbuild: rpm-pkg: fix version number handling

The "Release:" field of the spec file is determined based on the
.version file.

However, the .version file is not copied to the source tar file.
So, when we build the kernel from the source package, the UTS_VERSION
always indicates #1.  This does not match with "rpm -q".

The kernel UTS_VERSION and "rpm -q" do not agree for binrpm-pkg, either.
Please note the kernel has already been built before the spec file is
created.  Currently, mkspec invokes mkversion.  This script returns an
incremented version.  So, the "Release:" field of the spec file is
greater than the version in the kernel by one.

For the source package build (where .version file is missing), we can
give KBUILD_BUILD_VERSION=%{release} to the build command.

For the binary package build, we can simply read out the .version file
because it contains the version number that was used for building the
kernel image.

We can remove scripts/mkversion because scripts/package/Makefile need
not touch the .version file.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
7 years agokbuild: deb-pkg: remove firmware package support
Masahiro Yamada [Mon, 18 Sep 2017 09:22:19 +0000 (18:22 +0900)]
kbuild: deb-pkg: remove firmware package support

Commit 5620a0d1aacd ("firmware: delete in-kernel firmware") deleted
in-kernel firmware support, including the firmware install command.

So, the firmware package does not make sense any more.  Remove it.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Riku Voipio <riku.voipio@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agokbuild: rpm-pkg: delete firmware_install to fix build error
Masahiro Yamada [Mon, 18 Sep 2017 09:12:36 +0000 (18:12 +0900)]
kbuild: rpm-pkg: delete firmware_install to fix build error

Commit 5620a0d1aacd ("firmware: delete in-kernel firmware") deleted
in-kernel firmware support, including "make firmware_install".

Since then, "make rpm-pkg" / "make binrpm-pkg" fails to build with
the error:

  make[2]: *** No rule to make target `firmware_install'.  Stop.

Commit df85b2d767aa ("firmware: Restore support for built-in firmware")
restored the build infrastructure for CONFIG_EXTRA_FIRMWARE, but this
is out of the scope of "make firmware_install".  So, the right thing to
do is to kill the use of "make firmware_install".

Fixes: 5620a0d1aacd ("firmware: delete in-kernel firmware")
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
7 years agos390/topology: enable / disable topology dynamically
Heiko Carstens [Thu, 14 Sep 2017 12:42:32 +0000 (14:42 +0200)]
s390/topology: enable / disable topology dynamically

Add a new sysctl file /proc/sys/s390/topology which displays if
topology is on (1) or off (0) as specified by the "topology=" kernel
parameter.

This allows to change topology information during runtime and
configuring it via /etc/sysctl.conf instead of using the kernel line
parameter.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
7 years agos390/topology: alternative topology for topology-less machines
Heiko Carstens [Tue, 19 Sep 2017 10:52:22 +0000 (12:52 +0200)]
s390/topology: alternative topology for topology-less machines

If running on machines that do not provide topology information we
currently generate a "fake" topology which defines the maximum
distance between each cpu: each cpu will be put into an own drawer.

Historically this used to be the best option for (virtual) machines in
overcommited hypervisors.

For some workloads however it is better to generate a different
topology where all cpus are siblings within a package (all cpus are
core siblings). This shows performance improvements of up to 10%,
depending on the workload.

In order to keep the current behaviour, but also allow to switch to
the different core sibling topology use the existing "topology="
kernel parameter:

Specifying "topology=on" on machines without topology information will
generate the core siblings (fake) topology information, instead of the
default topology information where all cpus have the maximum distance.

On machines which provide topology information specifying
"topology=on" does not have any effect.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
7 years agopowerpc/kprobes: Update optprobes to use emulate_update_regs()
Naveen N. Rao [Fri, 15 Sep 2017 10:08:21 +0000 (15:38 +0530)]
powerpc/kprobes: Update optprobes to use emulate_update_regs()

Optprobes depended on an updated regs->nip from analyse_instr() to
identify the location to branch back from the optprobes trampoline.
However, since commit 3cdfcbfd32b9d ("powerpc: Change analyse_instr so
it doesn't modify *regs"), analyse_instr() doesn't update the registers
anymore.  Due to this, we end up branching back from the optprobes
trampoline to the same branch into the trampoline resulting in a loop.

Fix this by calling out to emulate_update_regs() before using the nip.
Additionally, explicitly compare the return value from analyse_instr()
to 1, rather than just checking for !0 so as to guard against any
future changes to analyse_instr() that may result in -1 being returned
in more scenarios.

Fixes: 3cdfcbfd32b9d ("powerpc: Change analyse_instr so it doesn't modify *regs")
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
7 years agoMerge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/scottwood/linux...
Michael Ellerman [Wed, 20 Sep 2017 10:05:24 +0000 (20:05 +1000)]
Merge branch 'next' of git://git./linux/kernel/git/scottwood/linux into fixes

Merge one commit from Scott which I missed while away.

7 years agocrypto: af_alg - update correct dst SGL entry
Stephan Mueller [Wed, 30 Aug 2017 07:17:39 +0000 (09:17 +0200)]
crypto: af_alg - update correct dst SGL entry

When two adjacent TX SGL are processed and parts of both TX SGLs
are pulled into the per-request TX SGL, the wrong per-request
TX SGL entries were updated.

This fixes a NULL pointer dereference when a cipher implementation walks
the TX SGL where some of the SGL entries were NULL.

Fixes: e870456d8e7c ("crypto: algif_skcipher - overhaul memory...")
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
7 years agocrypto: caam - fix LS1021A support on ARMv7 multiplatform kernel
Horia Geantă [Fri, 1 Sep 2017 14:12:59 +0000 (17:12 +0300)]
crypto: caam - fix LS1021A support on ARMv7 multiplatform kernel

When built using multi_v7_defconfig, driver does not work on LS1021A:
[...]
caam 1700000.crypto: can't identify CAAM ipg clk: -2
caam: probe of 1700000.crypto failed with error -2
[...]

It turns out we have to detect at runtime whether driver is running
on an i.MX platform or not.

Cc: <stable@vger.kernel.org>
Fixes: 6c3af9559352 ("crypto: caam - add support for LS1021A")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>