diff options
| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-20 20:00:39 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:15:22 +0200 |
| commit | d969c6fa7263c8fc1928f528bb68587872350b6c (patch) | |
| tree | ea96ad301cb9b73b87838e925411bb7e4d111ce4 /ipc | |
| parent | 69894718a515fef7ff633cf354fcd7ed73a88891 (diff) | |
| download | lwn-d969c6fa7263c8fc1928f528bb68587872350b6c.tar.gz lwn-d969c6fa7263c8fc1928f528bb68587872350b6c.zip | |
ipc: add semctl syscall/compat_syscall wrappers
Provide ksys_semctl() and compat_ksys_semctl() 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_semctl() and compat_sys_semctl().
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/20180325162527.GA17492@light.dominikbrodowski.net
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/sem.c | 14 | ||||
| -rw-r--r-- | ipc/syscall.c | 4 | ||||
| -rw-r--r-- | ipc/util.h | 2 |
3 files changed, 16 insertions, 4 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index 2e5f7ec7a7db..1cf56279a84c 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -1581,7 +1581,7 @@ out_up: return err; } -SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg) +long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg) { int version; struct ipc_namespace *ns; @@ -1635,6 +1635,11 @@ SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg) } } +SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg) +{ + return ksys_semctl(semid, semnum, cmd, arg); +} + #ifdef CONFIG_COMPAT struct compat_semid_ds { @@ -1683,7 +1688,7 @@ static int copy_compat_semid_to_user(void __user *buf, struct semid64_ds *in, } } -COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg) +long compat_ksys_semctl(int semid, int semnum, int cmd, int arg) { void __user *p = compat_ptr(arg); struct ipc_namespace *ns; @@ -1727,6 +1732,11 @@ COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg) return -EINVAL; } } + +COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg) +{ + return compat_ksys_semctl(semid, semnum, cmd, arg); +} #endif /* If the task doesn't already have a undo_list, then allocate one diff --git a/ipc/syscall.c b/ipc/syscall.c index 21fcdf0b4836..a536cca37661 100644 --- a/ipc/syscall.c +++ b/ipc/syscall.c @@ -42,7 +42,7 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second, return -EINVAL; if (get_user(arg, (unsigned long __user *) ptr)) return -EFAULT; - return sys_semctl(first, second, third, arg); + return ksys_semctl(first, second, third, arg); } case MSGSND: @@ -138,7 +138,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second, return -EINVAL; if (get_user(pad, (u32 __user *) compat_ptr(ptr))) return -EFAULT; - return compat_sys_semctl(first, second, third, pad); + return compat_ksys_semctl(first, second, third, pad); case MSGSND: return compat_sys_msgsnd(first, ptr, second, third); diff --git a/ipc/util.h b/ipc/util.h index 0f07056e5a73..1f1109b83437 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -241,12 +241,14 @@ long ksys_semtimedop(int semid, struct sembuf __user *tsops, unsigned int nsops, const struct timespec __user *timeout); long ksys_semget(key_t key, int nsems, int semflg); +long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg); /* for CONFIG_ARCH_WANT_OLD_COMPAT_IPC */ #ifdef CONFIG_COMPAT long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems, unsigned int nsops, const struct compat_timespec __user *timeout); +long compat_ksys_semctl(int semid, int semnum, int cmd, int arg); #endif /* CONFIG_COMPAT */ #endif |