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ipc: add semtimedop syscall/compat_syscall wrappers

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Provide ksys_semtimedop() and compat_ksys_semtimedop() wrappers to avoid
in-kernel calls to these syscalls. The ksys_ prefix denotes that these
functions are meant as a drop-in replacement for the syscalls. In
particular, they use the same calling convention as sys_semtimedop() and
compat_sys_semtimedop().

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/[email protected]

Cc: Al Viro <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Dominik Brodowski <[email protected]>
This commit is contained in:
Dominik Brodowski 2018-03-20 19:48:14 +01:00
commit 41f4f0e2f5
3 changed files with 41 additions and 12 deletions
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23
ipc/sem.c
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@ -2120,8 +2120,8 @@ out_free:
return error;
}
SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
unsigned, nsops, const struct timespec __user *, timeout)
long ksys_semtimedop(int semid, struct sembuf __user *tsops,
unsigned int nsops, const struct timespec __user *timeout)
{
if (timeout) {
struct timespec64 ts;
@ -2132,10 +2132,16 @@ SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
return do_semtimedop(semid, tsops, nsops, NULL);
}
SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops,
unsigned int, nsops, const struct timespec __user *, timeout)
{
return ksys_semtimedop(semid, tsops, nsops, timeout);
}
#ifdef CONFIG_COMPAT
COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
unsigned, nsops,
const struct compat_timespec __user *, timeout)
long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems,
unsigned int nsops,
const struct compat_timespec __user *timeout)
{
if (timeout) {
struct timespec64 ts;
@ -2145,6 +2151,13 @@ COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
}
return do_semtimedop(semid, tsems, nsops, NULL);
}
COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
unsigned int, nsops,
const struct compat_timespec __user *, timeout)
{
return compat_ksys_semtimedop(semid, tsems, nsops, timeout);
}
#endif
SYSCALL_DEFINE3(semop, int, semid, struct sembuf __user *, tsops,