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authorAndrey Konovalov <andreyknvl@google.com>2020-12-22 12:02:42 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-22 12:55:08 -0800
commitd56a9ef84bd0e1e8fba7a837ab12a4ec8476579f (patch)
tree8594b81ed26571653710b82023124edc08b3e6f0 /include
parent8bb0009b19465da5a0cd394b5a6ccc2eaf418f23 (diff)
kasan, arm64: unpoison stack only with CONFIG_KASAN_STACK
There's a config option CONFIG_KASAN_STACK that has to be enabled for KASAN to use stack instrumentation and perform validity checks for stack variables. There's no need to unpoison stack when CONFIG_KASAN_STACK is not enabled. Only call kasan_unpoison_task_stack[_below]() when CONFIG_KASAN_STACK is enabled. Note, that CONFIG_KASAN_STACK is an option that is currently always defined when CONFIG_KASAN is enabled, and therefore has to be tested with #if instead of #ifdef. Link: https://lkml.kernel.org/r/d09dd3f8abb388da397fd11598c5edeaa83fe559.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/If8a891e9fe01ea543e00b576852685afec0887e3 Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kasan.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index d22ec4c9c1bd..e638255ce906 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -77,8 +77,6 @@ static inline void kasan_disable_current(void) {}
void kasan_unpoison_range(const void *address, size_t size);
-void kasan_unpoison_task_stack(struct task_struct *task);
-
void kasan_alloc_pages(struct page *page, unsigned int order);
void kasan_free_pages(struct page *page, unsigned int order);
@@ -123,8 +121,6 @@ void kasan_restore_multi_shot(bool enabled);
static inline void kasan_unpoison_range(const void *address, size_t size) {}
-static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
-
static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
static inline void kasan_free_pages(struct page *page, unsigned int order) {}
@@ -176,6 +172,12 @@ static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
#endif /* CONFIG_KASAN */
+#if defined(CONFIG_KASAN) && CONFIG_KASAN_STACK
+void kasan_unpoison_task_stack(struct task_struct *task);
+#else
+static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
+#endif
+
#ifdef CONFIG_KASAN_GENERIC
void kasan_cache_shrink(struct kmem_cache *cache);