diff options
| author | Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> | 2022-06-15 08:22:18 +0200 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-07-18 02:14:33 +0200 |
| commit | 3de0de758029a0beb1d47facd3d390d2804a3e94 (patch) | |
| tree | 088f7bc44ea4a7dfe21060ee870332f58d5565f9 /mm/kasan/report.c | |
| parent | doc: proc: fix the description to THPeligible (diff) | |
| download | linux-3de0de758029a0beb1d47facd3d390d2804a3e94.tar.xz linux-3de0de758029a0beb1d47facd3d390d2804a3e94.zip | |
kasan: separate double free case from invalid free
Currently, KASAN describes all invalid-free/double-free bugs as
"double-free or invalid-free". This is ambiguous.
KASAN should report "double-free" when a double-free is a more likely
cause (the address points to the start of an object) and report
"invalid-free" otherwise [1].
[1] https://bugzilla.kernel.org/show_bug.cgi?id=212193
Link: https://lkml.kernel.org/r/20220615062219.22618-1-Kuan-Ying.Lee@mediatek.com
Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: Yee Lee <yee.lee@mediatek.com>
Cc: Andrew Yang <andrew.yang@mediatek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan/report.c')
| -rw-r--r-- | mm/kasan/report.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/mm/kasan/report.c b/mm/kasan/report.c index b341a191651d..fe3f606b3a98 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -176,8 +176,12 @@ static void end_report(unsigned long *flags, void *addr) static void print_error_description(struct kasan_report_info *info) { if (info->type == KASAN_REPORT_INVALID_FREE) { - pr_err("BUG: KASAN: double-free or invalid-free in %pS\n", - (void *)info->ip); + pr_err("BUG: KASAN: invalid-free in %pS\n", (void *)info->ip); + return; + } + + if (info->type == KASAN_REPORT_DOUBLE_FREE) { + pr_err("BUG: KASAN: double-free in %pS\n", (void *)info->ip); return; } @@ -433,7 +437,7 @@ static void print_report(struct kasan_report_info *info) } } -void kasan_report_invalid_free(void *ptr, unsigned long ip) +void kasan_report_invalid_free(void *ptr, unsigned long ip, enum kasan_report_type type) { unsigned long flags; struct kasan_report_info info; @@ -448,7 +452,7 @@ void kasan_report_invalid_free(void *ptr, unsigned long ip) start_report(&flags, true); - info.type = KASAN_REPORT_INVALID_FREE; + info.type = type; info.access_addr = ptr; info.first_bad_addr = kasan_reset_tag(ptr); info.access_size = 0; |