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UPSTREAM: kasan: simplify kasan_find_first_bad_addr call sites

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Move the addr_has_metadata() check into kasan_find_first_bad_addr().

Link: https://lkml.kernel.org/r/a49576f7a23283d786ba61579cb0c5057e8f0b9b.1646237226.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit b91328002d266da3f53703f753b3a2af0dc9b9c1)
Bug: 254721825
Change-Id: I3027be3ff2b5a887a1fd5a872485063ddc75d13f
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
This commit is contained in:
Andrey Konovalov
2022-03-24 18:12:46 -07:00
committed by Todd Kjos
parent eb88dfd710
commit bf0146f013
4 changed files with 10 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
mm/kasan/report.c
View File

@@ -431,10 +431,7 @@ static void __kasan_report(void *addr, size_t size, bool is_write,
start_report(&flags, true);
info.access_addr = addr;
if (addr_has_metadata(addr))
info.first_bad_addr = kasan_find_first_bad_addr(addr, size);
else
info.first_bad_addr = addr;
info.access_size = size;
info.is_write = is_write;
info.ip = ip;

4
mm/kasan/report_generic.c
View File

@@ -34,8 +34,12 @@ void *kasan_find_first_bad_addr(void *addr, size_t size)
{
void *p = addr;
if (!addr_has_metadata(p))
return p;
while (p < addr + size && !(*(u8 *)kasan_mem_to_shadow(p)))
p += KASAN_GRANULE_SIZE;
return p;
}

1
mm/kasan/report_hw_tags.c
View File

@@ -17,6 +17,7 @@
void *kasan_find_first_bad_addr(void *addr, size_t size)
{
/* Return the same value regardless of whether addr_has_metadata(). */
return kasan_reset_tag(addr);
}

4
mm/kasan/report_sw_tags.c
View File

@@ -36,8 +36,12 @@ void *kasan_find_first_bad_addr(void *addr, size_t size)
void *p = kasan_reset_tag(addr);
void *end = p + size;
if (!addr_has_metadata(p))
return p;
while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p))
p += KASAN_GRANULE_SIZE;
return p;
}