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y2038: signal: Change rt_sigtimedwait to use __kernel_timespec

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This changes sys_rt_sigtimedwait() to use get_timespec64(), changing
the timeout type to __kernel_timespec, which will be changed to use
a 64-bit time_t in the future. Since the do_sigtimedwait() core
function changes, we also have to modify the compat version of this
system call in the same way.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2018-04-18 15:56:13 +02:00
parent c2e6c8567a
commit 49c39f8464
2 changed files with 10 additions and 9 deletions
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2
include/linux/syscalls.h
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@ -635,7 +635,7 @@ asmlinkage long sys_rt_sigprocmask(int how, sigset_t __user *set,
asmlinkage long sys_rt_sigpending(sigset_t __user *set, size_t sigsetsize);
asmlinkage long sys_rt_sigtimedwait(const sigset_t __user *uthese,
siginfo_t __user *uinfo,
const struct timespec __user *uts,
const struct __kernel_timespec __user *uts,
size_t sigsetsize);
asmlinkage long sys_rt_sigqueueinfo(pid_t pid, int sig, siginfo_t __user *uinfo);

17
kernel/signal.c
View File

@ -3082,7 +3082,7 @@ int copy_siginfo_from_user32(struct siginfo *to,
* @ts: upper bound on process time suspension
*/
static int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
const struct timespec *ts)
const struct timespec64 *ts)
{
ktime_t *to = NULL, timeout = KTIME_MAX;
struct task_struct *tsk = current;
@ -3090,9 +3090,9 @@ static int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
int sig, ret = 0;
if (ts) {
if (!timespec_valid(ts))
if (!timespec64_valid(ts))
return -EINVAL;
timeout = timespec_to_ktime(*ts);
timeout = timespec64_to_ktime(*ts);
to = &timeout;
}
@ -3140,11 +3140,12 @@ static int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
* @sigsetsize: size of sigset_t type
*/
SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
siginfo_t __user *, uinfo, const struct timespec __user *, uts,
siginfo_t __user *, uinfo,
const struct __kernel_timespec __user *, uts,
size_t, sigsetsize)
{
sigset_t these;
struct timespec ts;
struct timespec64 ts;
siginfo_t info;
int ret;
@ -3156,7 +3157,7 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
return -EFAULT;
if (uts) {
if (copy_from_user(&ts, uts, sizeof(ts)))
if (get_timespec64(&ts, uts))
return -EFAULT;
}
@ -3176,7 +3177,7 @@ COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
struct old_timespec32 __user *, uts, compat_size_t, sigsetsize)
{
sigset_t s;
struct timespec t;
struct timespec64 t;
siginfo_t info;
long ret;
@ -3187,7 +3188,7 @@ COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese,
return -EFAULT;
if (uts) {
if (compat_get_timespec(&t, uts))
if (get_old_timespec32(&t, uts))
return -EFAULT;
}