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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-20 20:09:48 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:15:25 +0200 |
| commit | da1e2744341542e404c172bcf6a321f509408b14 (patch) | |
| tree | e2404117362bb519750e1f18b4d513c1958fab1b | |
| parent | 65749e0bb5e7de876ee43d3f601e32afe17e9248 (diff) | |
| download | linux-stable-da1e2744341542e404c172bcf6a321f509408b14.tar.gz linux-stable-da1e2744341542e404c172bcf6a321f509408b14.tar.bz2 linux-stable-da1e2744341542e404c172bcf6a321f509408b14.zip | |
ipc: add shmdt syscall wrapper
Provide ksys_shmdt() wrapper to avoid in-kernel calls to this syscall.
The ksys_ prefix denotes that this function is meant as a drop-in
replacement for the syscall. In particular, it uses the same calling
convention as sys_shmdt().
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>
| -rw-r--r-- | ipc/shm.c | 7 | ||||
| -rw-r--r-- | ipc/syscall.c | 4 | ||||
| -rw-r--r-- | ipc/util.h | 1 |
3 files changed, 9 insertions, 3 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index 9f3cdb259a51..e5838e3328dc 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -1481,7 +1481,7 @@ COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg) * detach and kill segment if marked destroyed. * The work is done in shm_close. */ -SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) +long ksys_shmdt(char __user *shmaddr) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; @@ -1588,6 +1588,11 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) return retval; } +SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) +{ + return ksys_shmdt(shmaddr); +} + #ifdef CONFIG_PROC_FS static int sysvipc_shm_proc_show(struct seq_file *s, void *it) { diff --git a/ipc/syscall.c b/ipc/syscall.c index 60bceb19b6f0..b3aa71564815 100644 --- a/ipc/syscall.c +++ b/ipc/syscall.c @@ -90,7 +90,7 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second, return -EINVAL; } case SHMDT: - return sys_shmdt((char __user *)ptr); + return ksys_shmdt((char __user *)ptr); case SHMGET: return ksys_shmget(first, second, third); case SHMCTL: @@ -178,7 +178,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second, return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third)); } case SHMDT: - return sys_shmdt(compat_ptr(ptr)); + return ksys_shmdt(compat_ptr(ptr)); case SHMGET: return ksys_shmget(first, (unsigned int)second, third); case SHMCTL: diff --git a/ipc/util.h b/ipc/util.h index 51002c0b2a21..7770bcad1168 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -244,6 +244,7 @@ long ksys_semget(key_t key, int nsems, int semflg); long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg); long ksys_msgget(key_t key, int msgflg); long ksys_shmget(key_t key, size_t size, int shmflg); +long ksys_shmdt(char __user *shmaddr); /* for CONFIG_ARCH_WANT_OLD_COMPAT_IPC */ #ifdef CONFIG_COMPAT |