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Remove bogus use of useracc() in (clock_)nanosleep.

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There's no point in pre-checking that we can access the user's rmtp
pointer before we do it in copyout().

While here, improve style(9) compliance.

Reviewed by:	imp
MFC after:	1 week
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D24409
This commit is contained in:
brooks 2020-04-14 20:53:12 +00:00
parent cfb2be0cff
commit d11edfe286
2 changed files with 4 additions and 14 deletions
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9
sys/compat/freebsd32/freebsd32_misc.c
View File

@ -2651,7 +2651,7 @@ freebsd32_user_clock_nanosleep(struct thread *td, clockid_t clock_id,
{
struct timespec32 rmt32, rqt32;
struct timespec rmt, rqt;
int error;
int error, error2;
error = copyin(ua_rqtp, &rqt32, sizeof(rqt32));
if (error)
@ -2660,18 +2660,13 @@ freebsd32_user_clock_nanosleep(struct thread *td, clockid_t clock_id,
CP(rqt32, rqt, tv_sec);
CP(rqt32, rqt, tv_nsec);
if (ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0 &&
!useracc(ua_rmtp, sizeof(rmt32), VM_PROT_WRITE))
return (EFAULT);
error = kern_clock_nanosleep(td, clock_id, flags, &rqt, &rmt);
if (error == EINTR && ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0) {
int error2;
CP(rmt, rmt32, tv_sec);
CP(rmt, rmt32, tv_nsec);
error2 = copyout(&rmt32, ua_rmtp, sizeof(rmt32));
if (error2)
if (error2 != 0)
error = error2;
}
return (error);

9
sys/kern/kern_time.c
View File

@ -625,20 +625,15 @@ user_clock_nanosleep(struct thread *td, clockid_t clock_id, int flags,
const struct timespec *ua_rqtp, struct timespec *ua_rmtp)
{
struct timespec rmt, rqt;
int error;
int error, error2;
error = copyin(ua_rqtp, &rqt, sizeof(rqt));
if (error)
return (error);
if (ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0 &&
!useracc(ua_rmtp, sizeof(rmt), VM_PROT_WRITE))
return (EFAULT);
error = kern_clock_nanosleep(td, clock_id, flags, &rqt, &rmt);
if (error == EINTR && ua_rmtp != NULL && (flags & TIMER_ABSTIME) == 0) {
int error2;
error2 = copyout(&rmt, ua_rmtp, sizeof(rmt));
if (error2)
if (error2 != 0)
error = error2;
}
return (error);