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linux(4): Replace copyin() by fueword32() in handle_futex_death().

Browse source 
According to fetch(9) fueword facility designed to fetch atomically
small amount of data from user space.

Reviewed by:		kib
Differential Revision:	https://reviews.freebsd.org/D31239
MFC after:		2 weeks
This commit is contained in:
Dmitry Chagin 2021-07-29 12:48:59 +03:00
parent 20979f38c1
commit cb01cc4a10
1 changed files with 2 additions and 5 deletions
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7
sys/compat/linux/linux_futex.c
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@ -101,7 +101,6 @@ LIN_SDT_PROBE_DEFINE0(futex, linux_futex, unimplemented_cmp_requeue_pi);
LIN_SDT_PROBE_DEFINE1(futex, linux_futex, unknown_operation, "int");
LIN_SDT_PROBE_DEFINE0(futex, linux_set_robust_list, size_error);
LIN_SDT_PROBE_DEFINE1(futex, linux_get_robust_list, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(futex, handle_futex_death, copyin_error, "int");
LIN_SDT_PROBE_DEFINE1(futex, fetch_robust_entry, copyin_error, "int");
LIN_SDT_PROBE_DEFINE1(futex, release_futexes, copyin_error, "int");
@ -705,11 +704,9 @@ handle_futex_death(struct linux_emuldata *em, uint32_t *uaddr,
int error;
retry:
error = copyin(uaddr, &uval, 4);
if (error) {
LIN_SDT_PROBE1(futex, handle_futex_death, copyin_error, error);
error = fueword32(uaddr, &uval);
if (error != 0)
return (EFAULT);
}
if ((uval & FUTEX_TID_MASK) == em->em_tid) {
mval = (uval & FUTEX_WAITERS) | FUTEX_OWNER_DIED;
nval = casuword32(uaddr, uval, mval);