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nanosleep: use copy_to_user instead of direct access

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NAKAMURA Gou
2015-09-17 20:09:54 +09:00
parent a3e440414d
commit 92f8fb2b2b
1 changed files with 6 additions and 8 deletions
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14
kernel/syscall.c
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@@ -5036,12 +5036,6 @@ SYSCALL_DECLARE(nanosleep)
return -EFAULT; return -EFAULT;
} }
if (rem) {
if (copy_from_user(&_rem, rem, sizeof(*rem))) {
return -EFAULT;
}
}
if (tv->tv_sec < 0 || tv->tv_nsec >= NS_PER_SEC) { if (tv->tv_sec < 0 || tv->tv_nsec >= NS_PER_SEC) {
return -EINVAL; return -EINVAL;
} }
@@ -5060,8 +5054,12 @@ SYSCALL_DECLARE(nanosleep)
} }
if (nanosecs_rem) { if (nanosecs_rem) {
rem->tv_sec = nanosecs_rem / NS_PER_SEC; _rem.tv_sec = nanosecs_rem / NS_PER_SEC;
rem->tv_nsec = nanosecs_rem % NS_PER_SEC; _rem.tv_nsec = nanosecs_rem % NS_PER_SEC;
if (copy_to_user(rem, &_rem, sizeof(*rem))) {
ret = -EFAULT;
}
} }
return ret; return ret;