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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-20 21:29:00 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:28 +0200
commit31c213f2106b7ea06f7fdc94ef8b785ed5342cf7 (patch)
tree2d35678c97d438ac743f30b596006370a1e02c15 /ipc/msg.c
parentipc: add msgrcv syscall/compat_syscall wrappers (diff)
downloadlinux-dev-31c213f2106b7ea06f7fdc94ef8b785ed5342cf7.tar.xz
linux-dev-31c213f2106b7ea06f7fdc94ef8b785ed5342cf7.zip
ipc: add msgsnd syscall/compat_syscall wrappers
Provide ksys_msgsnd() and compat_ksys_msgsnd() 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_msgsnd() and compat_sys_msgsnd(). 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/msg.c')
-rw-r--r--ipc/msg.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index abc5826270a6..9de48065c1ac 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -867,8 +867,8 @@ out_unlock1:
return err;
}
-SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
- int, msgflg)
+long ksys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz,
+ int msgflg)
{
long mtype;
@@ -877,6 +877,12 @@ SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
return do_msgsnd(msqid, mtype, msgp->mtext, msgsz, msgflg);
}
+SYSCALL_DEFINE4(msgsnd, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
+ int, msgflg)
+{
+ return ksys_msgsnd(msqid, msgp, msgsz, msgflg);
+}
+
#ifdef CONFIG_COMPAT
struct compat_msgbuf {
@@ -884,8 +890,8 @@ struct compat_msgbuf {
char mtext[1];
};
-COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
- compat_ssize_t, msgsz, int, msgflg)
+long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp,
+ compat_ssize_t msgsz, int msgflg)
{
struct compat_msgbuf __user *up = compat_ptr(msgp);
compat_long_t mtype;
@@ -894,6 +900,12 @@ COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
return -EFAULT;
return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
}
+
+COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
+ compat_ssize_t, msgsz, int, msgflg)
+{
+ return compat_ksys_msgsnd(msqid, msgp, msgsz, msgflg);
+}
#endif
static inline int convert_mode(long *msgtyp, int msgflg)