diff options
| author | Kees Cook <keescook@chromium.org> | 2020-04-06 20:12:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-07 10:43:44 -0700 |
| commit | 1d2252fab9a1c9206d1c981c0c15d5e01e0f5729 (patch) | |
| tree | 9807e090d70924c1b679aefc9101f383833d7ca1 | |
| parent | 1d28c8d6d076efdec762026f7192c7cf251c66be (diff) | |
kasan: unset panic_on_warn before calling panic()
As done in the full WARN() handler, panic_on_warn needs to be cleared
before calling panic() to avoid recursive panics.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Elena Petrova <lenaptr@google.com>
Cc: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Link: http://lkml.kernel.org/r/20200227193516.32566-6-keescook@chromium.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/kasan/report.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/mm/kasan/report.c b/mm/kasan/report.c index cf5c17d5e361..80f23c9da6b0 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -92,8 +92,16 @@ static void end_report(unsigned long *flags) pr_err("==================================================================\n"); add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); spin_unlock_irqrestore(&report_lock, *flags); - if (panic_on_warn) + if (panic_on_warn) { + /* + * This thread may hit another WARN() in the panic path. + * Resetting this prevents additional WARN() from panicking the + * system on this thread. Other threads are blocked by the + * panic_mutex in panic(). + */ + panic_on_warn = 0; panic("panic_on_warn set ...\n"); + } kasan_enable_current(); } |