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authorAndrey Konovalov <andreyknvl@google.com>2018-12-28 00:30:42 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 12:11:44 -0800
commit121e8f81d38cc43834195722d0768340dc130a33 (patch)
tree32faed70e178a432765edf7e12ad3e8314db15f1 /mm/kasan/kasan.h
parent11cd3cd69a256a353dd1a249b48ccd727d945952 (diff)
downloadlinux-121e8f81d38cc43834195722d0768340dc130a33.tar.bz2
kasan: add bug reporting routines for tag-based mode
This commit adds rountines, that print tag-based KASAN error reports. Those are quite similar to generic KASAN, the difference is: 1. The way tag-based KASAN finds the first bad shadow cell (with a mismatching tag). Tag-based KASAN compares memory tags from the shadow memory to the pointer tag. 2. Tag-based KASAN reports all bugs with the "KASAN: invalid-access" header. Also simplify generic KASAN find_first_bad_addr. Link: http://lkml.kernel.org/r/aee6897b1bd077732a315fd84c6b4f234dbfdfcb.1544099024.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Mark Rutland <mark.rutland@arm.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 'mm/kasan/kasan.h')
-rw-r--r--mm/kasan/kasan.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 33cc3b0e017e..82a23b23ff93 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -119,6 +119,7 @@ void kasan_poison_shadow(const void *address, size_t size, u8 value);
void check_memory_region(unsigned long addr, size_t size, bool write,
unsigned long ret_ip);
+void *find_first_bad_addr(void *addr, size_t size);
const char *get_bug_type(struct kasan_access_info *info);
void kasan_report(unsigned long addr, size_t size,
@@ -139,10 +140,14 @@ static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
#ifdef CONFIG_KASAN_SW_TAGS
+void print_tags(u8 addr_tag, const void *addr);
+
u8 random_tag(void);
#else
+static inline void print_tags(u8 addr_tag, const void *addr) { }
+
static inline u8 random_tag(void)
{
return 0;