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linux(4): Handle incorrect FUTEX_CLOCK_REALTIME option bit.

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Return ENOSYS if the FUTEX_CLOCK_REALTIME option bit is specified for an
inappropriate futex operation.

MFC after:		2 weeks
This commit is contained in:
Dmitry Chagin 2021-07-29 12:55:33 +03:00
parent a9bb1b1c18
commit 626cbd4648
1 changed files with 6 additions and 0 deletions
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6
sys/compat/linux/linux_futex.c
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@ -224,6 +224,12 @@ linux_futex(struct thread *td, struct linux_futex_args *args)
args->clockrt = args->op & LINUX_FUTEX_CLOCK_REALTIME;
args->op = args->op & ~LINUX_FUTEX_CLOCK_REALTIME;
if (args->clockrt &&
args->op != LINUX_FUTEX_WAIT_BITSET &&
args->op != LINUX_FUTEX_WAIT_REQUEUE_PI &&
args->op != LINUX_FUTEX_LOCK_PI2)
return (ENOSYS);
switch (args->op) {
case LINUX_FUTEX_WAIT:
args->val3 = FUTEX_BITSET_MATCH_ANY;