Merge tag 'for-linus-6.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/uml...

Pull UML fixes from Richard Weinberger:

 - Various fixes for build warnings

 - Fix default kernel command line

* tag 'for-linus-6.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux:
  arch: um: Mark the stack non-executable to fix a binutils warning
  um: Prevent KASAN splats in dump_stack()
  um: fix default console kernel parameter
  um: Cleanup compiler warning in arch/x86/um/tls_32.c
  um: Cleanup syscall_handler_t cast in syscalls_32.h

diff --git a/arch/um/Makefile b/arch/um/Makefile
index f2fe63b..f1d4d67 100644 (file)
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -132,10 +132,18 @@ export LDS_ELF_FORMAT := $(ELF_FORMAT)
 # The wrappers will select whether using "malloc" or the kernel allocator.
 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 
+# Avoid binutils 2.39+ warnings by marking the stack non-executable and
+# ignorning warnings for the kallsyms sections.
+LDFLAGS_EXECSTACK = -z noexecstack
+ifeq ($(CONFIG_LD_IS_BFD),y)
+LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
+endif
+
 LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))
 
 # Used by link-vmlinux.sh which has special support for um link
 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
+export LDFLAGS_vmlinux := $(LDFLAGS_EXECSTACK)
 
 # When cleaning we don't include .config, so we don't include
 # TT or skas makefiles and don't clean skas_ptregs.h.

diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index 7452f70..7467153 100644 (file)
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -48,7 +48,8 @@ void show_stack(struct task_struct *task, unsigned long *stack,
                        break;
                if (i && ((i % STACKSLOTS_PER_LINE) == 0))
                        pr_cont("\n");
-               pr_cont(" %08lx", *stack++);
+               pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
+               stack++;
        }
 
        printk("%sCall Trace:\n", loglvl);

diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index e0de60e..d9e023c 100644 (file)
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -33,7 +33,7 @@
 #include "um_arch.h"
 
 #define DEFAULT_COMMAND_LINE_ROOT "root=98:0"
-#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty"
+#define DEFAULT_COMMAND_LINE_CONSOLE "console=tty0"
 
 /* Changed in add_arg and setup_arch, which run before SMP is started */
 static char __initdata command_line[COMMAND_LINE_SIZE] = { 0 };

diff --git a/arch/x86/um/shared/sysdep/syscalls_32.h b/arch/x86/um/shared/sysdep/syscalls_32.h
index 68fd2cf..f6e9f84 100644 (file)
--- a/arch/x86/um/shared/sysdep/syscalls_32.h
+++ b/arch/x86/um/shared/sysdep/syscalls_32.h
@@ -6,10 +6,9 @@
 #include <asm/unistd.h>
 #include <sysdep/ptrace.h>
 
-typedef long syscall_handler_t(struct pt_regs);
+typedef long syscall_handler_t(struct syscall_args);
 
 extern syscall_handler_t *sys_call_table[];
 
 #define EXECUTE_SYSCALL(syscall, regs) \
-       ((long (*)(struct syscall_args)) \
-        (*sys_call_table[syscall]))(SYSCALL_ARGS(&regs->regs))
+       ((*sys_call_table[syscall]))(SYSCALL_ARGS(&regs->regs))

diff --git a/arch/x86/um/tls_32.c b/arch/x86/um/tls_32.c
index ac8eee0..66162ea 100644 (file)
--- a/arch/x86/um/tls_32.c
+++ b/arch/x86/um/tls_32.c
@@ -65,9 +65,6 @@ static int get_free_idx(struct task_struct* task)
        struct thread_struct *t = &task->thread;
        int idx;
 
-       if (!t->arch.tls_array)
-               return GDT_ENTRY_TLS_MIN;
-
        for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++)
                if (!t->arch.tls_array[idx].present)
                        return idx + GDT_ENTRY_TLS_MIN;
@@ -240,9 +237,6 @@ static int get_tls_entry(struct task_struct *task, struct user_desc *info,
 {
        struct thread_struct *t = &task->thread;
 
-       if (!t->arch.tls_array)
-               goto clear;
-
        if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX)
                return -EINVAL;
 

diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile
index 8c0396f..6fbe97c 100644 (file)
--- a/arch/x86/um/vdso/Makefile
+++ b/arch/x86/um/vdso/Makefile
@@ -65,7 +65,7 @@ quiet_cmd_vdso = VDSO    $@
                       -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
                 sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
 
-VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv
+VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack
 GCOV_PROFILE := n
 
 #