Introduce [compat_]save_altstack_ex() to unbreak x86 SMAP

commit bd1c149aa9915b9abb6d83d0f01dfd2ace0680b5 upstream.

For performance reasons, when SMAP is in use, SMAP is left open for an
entire put_user_try { ... } put_user_catch(); block, however, calling
__put_user() in the middle of that block will close SMAP as the
STAC..CLAC constructs intentionally do not nest.

Furthermore, using __put_user() rather than put_user_ex() here is bad
for performance.

Thus, introduce new [compat_]save_altstack_ex() helpers that replace
__[compat_]save_altstack() for x86, being currently the only
architecture which supports put_user_try { ... } put_user_catch().

Reported-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/n/tip-es5p6y64if71k8p5u08agv9n@git.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index bccfca6..665a730 100644 (file)
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -457,7 +457,7 @@ int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
                else
                        put_user_ex(0, &frame->uc.uc_flags);
                put_user_ex(0, &frame->uc.uc_link);
-               err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
+               compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
 
                if (ksig->ka.sa.sa_flags & SA_RESTORER)
                        restorer = ksig->ka.sa.sa_restorer;

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index cf91358..d859eea 100644 (file)
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -358,7 +358,7 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
                else
                        put_user_ex(0, &frame->uc.uc_flags);
                put_user_ex(0, &frame->uc.uc_link);
-               err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
+               save_altstack_ex(&frame->uc.uc_stack, regs->sp);
 
                /* Set up to return from userspace.  */
                restorer = VDSO32_SYMBOL(current->mm->context.vdso, rt_sigreturn);
@@ -423,7 +423,7 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
                else
                        put_user_ex(0, &frame->uc.uc_flags);
                put_user_ex(0, &frame->uc.uc_link);
-               err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
+               save_altstack_ex(&frame->uc.uc_stack, regs->sp);
 
                /* Set up to return from userspace.  If provided, use a stub
                   already in userspace.  */
@@ -490,7 +490,7 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
                else
                        put_user_ex(0, &frame->uc.uc_flags);
                put_user_ex(0, &frame->uc.uc_link);
-               err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
+               compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
                put_user_ex(0, &frame->uc.uc__pad0);
 
                if (ksig->ka.sa.sa_flags & SA_RESTORER) {

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 7f0c1dd..ec1aee4 100644 (file)
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -669,6 +669,13 @@ asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 
 int compat_restore_altstack(const compat_stack_t __user *uss);
 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
+#define compat_save_altstack_ex(uss, sp) do { \
+       compat_stack_t __user *__uss = uss; \
+       struct task_struct *t = current; \
+       put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
+       put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
+       put_user_ex(t->sas_ss_size, &__uss->ss_size); \
+} while (0);
 
 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
                                                 struct compat_timespec __user *interval);

diff --git a/include/linux/signal.h b/include/linux/signal.h
index d897484..2ac423b 100644 (file)
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -434,6 +434,14 @@ void signals_init(void);
 int restore_altstack(const stack_t __user *);
 int __save_altstack(stack_t __user *, unsigned long);
 
+#define save_altstack_ex(uss, sp) do { \
+       stack_t __user *__uss = uss; \
+       struct task_struct *t = current; \
+       put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
+       put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
+       put_user_ex(t->sas_ss_size, &__uss->ss_size); \
+} while (0);
+
 #ifdef CONFIG_PROC_FS
 struct seq_file;
 extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);