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| author | Alexander Bulekov <alxndr@bu.edu> | 2021-08-04 09:56:20 -0400 |
|---|---|---|
| committer | Alexander Bulekov <alxndr@bu.edu> | 2021-09-01 07:33:13 -0400 |
| commit | 40c0d963db2a9d4a49c15554817bbaa11e0bed47 (patch) | |
| tree | 4bbb0993504f4e51d07ba0974b6e2fef5a1016cc | |
| parent | dfc86c0f25126ce3242b317087234c7228418eb2 (diff) | |
| download | focaccia-qemu-40c0d963db2a9d4a49c15554817bbaa11e0bed47.tar.gz focaccia-qemu-40c0d963db2a9d4a49c15554817bbaa11e0bed47.zip | |
fuzz: use ITIMER_REAL for timeouts
Using ITIMER_VIRTUAL is a bad idea, if the fuzzer hits a blocking syscall - e.g. ppoll with a NULL timespec. This causes timeout issues while fuzzing some block-device code. Fix that by using wall-clock time. This might cause inputs to timeout sometimes due to scheduling effects/ambient load, but it is better than bringing the entire fuzzing process to a halt. Based-on: <20210713150037.9297-1-alxndr@bu.edu> Signed-off-by: Alexander Bulekov <alxndr@bu.edu> Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
| -rw-r--r-- | tests/qtest/fuzz/generic_fuzz.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/qtest/fuzz/generic_fuzz.c b/tests/qtest/fuzz/generic_fuzz.c index 3e8ce29227..de427a3727 100644 --- a/tests/qtest/fuzz/generic_fuzz.c +++ b/tests/qtest/fuzz/generic_fuzz.c @@ -695,7 +695,7 @@ static void generic_fuzz(QTestState *s, const unsigned char *Data, size_t Size) while (cmd && Size) { /* Reset the timeout, each time we run a new command */ if (timeout) { - setitimer(ITIMER_VIRTUAL, &timer, NULL); + setitimer(ITIMER_REAL, &timer, NULL); } /* Get the length until the next command or end of input */ |