path: root/ipc/shm.c
diff options
authorDominik Brodowski <>2018-03-20 20:09:48 +0100
committerDominik Brodowski <>2018-04-02 20:15:25 +0200
commitda1e2744341542e404c172bcf6a321f509408b14 (patch)
treee2404117362bb519750e1f18b4d513c1958fab1b /ipc/shm.c
parent65749e0bb5e7de876ee43d3f601e32afe17e9248 (diff)
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 Cc: Al Viro <> Cc: Andrew Morton <> Signed-off-by: Dominik Brodowski <>
Diffstat (limited to 'ipc/shm.c')
1 files changed, 6 insertions, 1 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);
static int sysvipc_shm_proc_show(struct seq_file *s, void *it)