diff options
| author | Kees Cook <[email protected]> | 2020-04-06 20:12:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2020-04-07 10:43:44 -0700 |
| commit | 1d28c8d6d076efdec762026f7192c7cf251c66be (patch) | |
| tree | 1868348b2260819d9bde9379a170d0742cbaaf4c | |
| parent | ae2e1aad3e48e495878d9f149e437a308bfdaefa (diff) | |
ubsan: check panic_on_warn
Syzkaller expects kernel warnings to panic when the panic_on_warn sysctl
is set. More work is needed here to have UBSan reuse the WARN
infrastructure, but for now, just check the flag manually.
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Konovalov <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Dan Carpenter <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Elena Petrova <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Link: https://lore.kernel.org/lkml/CACT4Y+bsLJ-wFx_TaXqax3JByUOWB3uk787LsyMVcfW6JzzGvg@mail.gmail.com
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | lib/ubsan.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/lib/ubsan.c b/lib/ubsan.c index 7b9b58aee72c..429663eef6a7 100644 --- a/lib/ubsan.c +++ b/lib/ubsan.c @@ -156,6 +156,17 @@ static void ubsan_epilogue(void) "========================================\n"); current->in_ubsan--; + + 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"); + } } static void handle_overflow(struct overflow_data *data, void *lhs, |