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authorAndrey Konovalov <andreyknvl@google.com>2022-03-24 18:12:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-24 19:06:49 -0700
commitb91328002d266da3f53703f753b3a2af0dc9b9c1 (patch)
treefaccbd63f5724eddd83c4054c9c4973a5de2aba6 /mm/kasan
parent9d7b7dd946924de43021f57a8bee122ff0744d93 (diff)
kasan: simplify kasan_find_first_bad_addr call sites
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>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/report.c5
-rw-r--r--mm/kasan/report_generic.c4
-rw-r--r--mm/kasan/report_hw_tags.c1
-rw-r--r--mm/kasan/report_sw_tags.c4
4 files changed, 10 insertions, 4 deletions
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index bb4c29b439b1..a0d4a9d3f933 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -444,10 +444,7 @@ 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.first_bad_addr = kasan_find_first_bad_addr(addr, size);
info.access_size = size;
info.is_write = is_write;
info.ip = ip;
diff --git a/mm/kasan/report_generic.c b/mm/kasan/report_generic.c
index 7e03cca569a7..182239ca184c 100644
--- a/mm/kasan/report_generic.c
+++ b/mm/kasan/report_generic.c
@@ -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;
}
diff --git a/mm/kasan/report_hw_tags.c b/mm/kasan/report_hw_tags.c
index 5dbbbb930e7a..f3d3be614e4b 100644
--- a/mm/kasan/report_hw_tags.c
+++ b/mm/kasan/report_hw_tags.c
@@ -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);
}
diff --git a/mm/kasan/report_sw_tags.c b/mm/kasan/report_sw_tags.c
index 7271f0988fc0..7a26397297ed 100644
--- a/mm/kasan/report_sw_tags.c
+++ b/mm/kasan/report_sw_tags.c
@@ -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;
}