From: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Subject: mm: prevent KASAN false positives in kmemleak When kmemleak dumps contents of leaked objects it reads whole objects regardless of user-requested size. This upsets KASAN. Disable KASAN checks around object dump. Link: http://lkml.kernel.org/r/1466617631-68387-1-git-send-email-dvyukov@xxxxxxxxxx Signed-off-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/kmemleak.c | 2 ++ 1 file changed, 2 insertions(+) diff -puN mm/kmemleak.c~mm-prevent-kasan-false-positives-in-kmemleak mm/kmemleak.c --- a/mm/kmemleak.c~mm-prevent-kasan-false-positives-in-kmemleak +++ a/mm/kmemleak.c @@ -307,8 +307,10 @@ static void hex_dump_object(struct seq_f len = min_t(size_t, object->size, HEX_MAX_LINES * HEX_ROW_SIZE); seq_printf(seq, " hex dump (first %zu bytes):\n", len); + kasan_disable_current(); seq_hex_dump(seq, " ", DUMP_PREFIX_NONE, HEX_ROW_SIZE, HEX_GROUP_SIZE, ptr, len, HEX_ASCII); + kasan_enable_current(); } /* _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
