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semtimedop(): move compat to native

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... and finally kill the sodding compat_convert_timespec()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-07-09 10:50:14 -04:00
parent a78ee9ed2f
commit 44ee454670
4 changed files with 33 additions and 53 deletions
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9
include/linux/compat.h
View File

@ -171,15 +171,6 @@ extern int get_compat_itimerspec64(struct itimerspec64 *its,
extern int put_compat_itimerspec64(const struct itimerspec64 *its,
struct compat_itimerspec __user *uits);
/*
* This function convert a timespec if necessary and returns a *user
* space* pointer. If no conversion is necessary, it returns the
* initial pointer. NULL is a legitimate argument and will always
* output NULL.
*/
extern int compat_convert_timespec(struct timespec __user **,
const void __user *);
struct compat_iovec {
compat_uptr_t iov_base;
compat_size_t iov_len;

10
ipc/compat.c
View File

@ -79,13 +79,3 @@ void to_compat_ipc_perm(struct compat_ipc_perm *to, struct ipc64_perm *from)
to->mode = from->mode;
to->seq = from->seq;
}
COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
unsigned, nsops,
const struct compat_timespec __user *, timeout)
{
struct timespec __user *ts64;
if (compat_convert_timespec(&ts64, timeout))
return -EFAULT;
return sys_semtimedop(semid, tsems, nsops, ts64);
}

44
ipc/sem.c
View File

@ -1855,8 +1855,8 @@ static struct sem_undo *find_alloc_undo(struct ipc_namespace *ns, int semid)
return un;
}
SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
unsigned, nsops, const struct timespec __user *, timeout)
static long do_semtimedop(int semid, struct sembuf __user *tsops,
unsigned nsops, const struct timespec *timeout)
{
int error = -EINVAL;
struct sem_array *sma;
@ -1887,17 +1887,12 @@ SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
}
if (timeout) {
struct timespec _timeout;
if (copy_from_user(&_timeout, timeout, sizeof(*timeout))) {
error = -EFAULT;
goto out_free;
}
if (_timeout.tv_sec < 0 || _timeout.tv_nsec < 0 ||
_timeout.tv_nsec >= 1000000000L) {
if (timeout->tv_sec < 0 || timeout->tv_nsec < 0 ||
timeout->tv_nsec >= 1000000000L) {
error = -EINVAL;
goto out_free;
}
jiffies_left = timespec_to_jiffies(&_timeout);
jiffies_left = timespec_to_jiffies(timeout);
}
max = 0;
@ -2112,10 +2107,37 @@ SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
return error;
}
SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
unsigned, nsops, const struct timespec __user *, timeout)
{
if (timeout) {
struct timespec ts;
if (copy_from_user(&ts, timeout, sizeof(*timeout)))
return -EFAULT;
return do_semtimedop(semid, tsops, nsops, &ts);
}
return do_semtimedop(semid, tsops, nsops, NULL);
}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
unsigned, nsops,
const struct compat_timespec __user *, timeout)
{
if (timeout) {
struct timespec ts;
if (compat_get_timespec(&ts, timeout))
return -EFAULT;
return do_semtimedop(semid, tsems, nsops, &ts);
}
return do_semtimedop(semid, tsems, nsops, NULL);
}
#endif
SYSCALL_DEFINE3(semop, int, semid, struct sembuf __user *, tsops,
unsigned, nsops)
{
return sys_semtimedop(semid, tsops, nsops, NULL);
return do_semtimedop(semid, tsops, nsops, NULL);
}
/* If CLONE_SYSVSEM is set, establish sharing of SEM_UNDO state between

23
kernel/compat.c
View File

@ -200,29 +200,6 @@ int compat_put_timespec(const struct timespec *ts, void __user *uts)
}
EXPORT_SYMBOL_GPL(compat_put_timespec);
int compat_convert_timespec(struct timespec __user **kts,
const void __user *cts)
{
struct timespec ts;
struct timespec __user *uts;
if (!cts || COMPAT_USE_64BIT_TIME) {
*kts = (struct timespec __user *)cts;
return 0;
}
uts = compat_alloc_user_space(sizeof(ts));
if (!uts)
return -EFAULT;
if (compat_get_timespec(&ts, cts))
return -EFAULT;
if (copy_to_user(uts, &ts, sizeof(ts)))
return -EFAULT;
*kts = uts;
return 0;
}
int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i)
{
struct compat_itimerval v32;