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| author |   Kees Cook <keescook@chromium.org> | 2022-02-19 17:26:00 -0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-02-25 18:21:23 -0800 |
| commit | 92652cf986441b18282db6e5bd82afc74e8ed5e9 (patch) | |
| tree | 7d2cab1235f3216501ef6a499575872083bab455 /arch/xtensa/kernel | |
| parent | usercopy: Check valid lifetime via stack depth (diff) | |
| download | linux-dev-92652cf986441b18282db6e5bd82afc74e8ed5e9.tar.xz linux-dev-92652cf986441b18282db6e5bd82afc74e8ed5e9.zip | |
xtensa: Implement "current_stack_pointer"
To follow the existing per-arch conventions replace open-coded uses
of asm "sp" as "current_stack_pointer". This will let it be used in
non-arch places (like HARDENED_USERCOPY).
Cc: Chris Zankel <chris@zankel.net>
Cc: Marc Zyngier <maz@kernel.org>
Cc: linux-xtensa@linux-xtensa.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Link: https://lore.kernel.org/lkml/CAMo8BfJFJE-n3=AF+pb9_6oF3gzxX7a+7aBrASHjjNX5byqDqw@mail.gmail.com
Diffstat (limited to 'arch/xtensa/kernel')
| -rw-r--r-- | arch/xtensa/kernel/irq.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/xtensa/kernel/irq.c b/arch/xtensa/kernel/irq.c index 15051a8a1539..529fe9245821 100644 --- a/arch/xtensa/kernel/irq.c +++ b/arch/xtensa/kernel/irq.c @@ -36,9 +36,8 @@ asmlinkage void do_IRQ(int hwirq, struct pt_regs *regs) #ifdef CONFIG_DEBUG_STACKOVERFLOW /* Debugging check for stack overflow: is there less than 1KB free? */ { - unsigned long sp; + unsigned long sp = current_stack_pointer; - __asm__ __volatile__ ("mov %0, a1\n" : "=a" (sp)); sp &= THREAD_SIZE - 1; if (unlikely(sp < (sizeof(thread_info) + 1024))) |