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authorVincenzo Frascino <vincenzo.frascino@arm.com>2020-08-07 09:24:50 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 21:33:28 +0300
commitc0e16ab3b5887e86cd45b95e28cf66498b161ee1 (patch)
tree66de1cc0ea65e714d64b072b848dab657ba6b29f /mm/kasan
parent9793b62663f54e369a3986543b296992a8a0589c (diff)
downloadlinux-c0e16ab3b5887e86cd45b95e28cf66498b161ee1.tar.xz
kasan: remove kasan_unpoison_stack_above_sp_to()
kasan_unpoison_stack_above_sp_to() is defined in kasan code but never used. The function was introduced as part of the commit: commit 9f7d416c36124667 ("kprobes: Unpoison stack in jprobe_return() for KASAN") ... where it was necessary because x86's jprobe_return() would leave stale shadow on the stack, and was an oddity in that regard. Since then, jprobes were removed entirely, and as of commit: commit 80006dbee674f9fa ("kprobes/x86: Remove jprobe implementation") ... there have been no callers of this function. Remove the declaration and the implementation. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Andrey Konovalov <andreyknvl@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Link: http://lkml.kernel.org/r/20200706143505.23299-1-vincenzo.frascino@arm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/common.c15
1 files changed, 0 insertions, 15 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index f18067736f7c..950fd372a07e 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -180,21 +180,6 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
kasan_unpoison_shadow(base, watermark - base);
}
-/*
- * Clear all poison for the region between the current SP and a provided
- * watermark value, as is sometimes required prior to hand-crafted asm function
- * returns in the middle of functions.
- */
-void kasan_unpoison_stack_above_sp_to(const void *watermark)
-{
- const void *sp = __builtin_frame_address(0);
- size_t size = watermark - sp;
-
- if (WARN_ON(sp > watermark))
- return;
- kasan_unpoison_shadow(sp, size);
-}
-
void kasan_alloc_pages(struct page *page, unsigned int order)
{
u8 tag;