From: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Subject: 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.
Link: http://lkml.kernel.org/r/20200706143505.23299-1-vincenzo.frascino@xxxxxxx
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx>
Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kasan.h | 2 --
mm/kasan/common.c | 15 ---------------
2 files changed, 17 deletions(-)
--- a/include/linux/kasan.h~kasan-remove-kasan_unpoison_stack_above_sp_to
+++ a/include/linux/kasan.h
@@ -38,7 +38,6 @@ extern void kasan_disable_current(void);
void kasan_unpoison_shadow(const void *address, size_t size);
void kasan_unpoison_task_stack(struct task_struct *task);
-void kasan_unpoison_stack_above_sp_to(const void *watermark);
void kasan_alloc_pages(struct page *page, unsigned int order);
void kasan_free_pages(struct page *page, unsigned int order);
@@ -101,7 +100,6 @@ void kasan_restore_multi_shot(bool enabl
static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
-static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
static inline void kasan_enable_current(void) {}
static inline void kasan_disable_current(void) {}
--- a/mm/kasan/common.c~kasan-remove-kasan_unpoison_stack_above_sp_to
+++ a/mm/kasan/common.c
@@ -180,21 +180,6 @@ asmlinkage void kasan_unpoison_task_stac
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;
_
