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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-20 22:15:28 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:15:26 +0300
commite340db56483b6e10bd5e5f281071876808801a41 (patch)
tree12c427cf6f010120b983f133965cf8157a892c2d /ipc/msg.c
parentc84d0791dfa7fe8f051082c09a558eb3e2d01931 (diff)
downloadlinux-e340db56483b6e10bd5e5f281071876808801a41.tar.xz
ipc: add msgctl syscall/compat_syscall wrappers
Provide ksys_msgctl() and compat_ksys_msgctl() 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_msgctl() and compat_sys_msgctl(). 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.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index 64e8276be164..5b026868df07 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -538,7 +538,7 @@ out_unlock:
return err;
}
-SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
+long ksys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf)
{
int version;
struct ipc_namespace *ns;
@@ -581,6 +581,11 @@ SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
}
}
+SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
+{
+ return ksys_msgctl(msqid, cmd, buf);
+}
+
#ifdef CONFIG_COMPAT
struct compat_msqid_ds {
@@ -651,7 +656,7 @@ static int copy_compat_msqid_to_user(void __user *buf, struct msqid64_ds *in,
}
}
-COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr)
+long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr)
{
struct ipc_namespace *ns;
int err;
@@ -692,6 +697,11 @@ COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr)
return -EINVAL;
}
}
+
+COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr)
+{
+ return compat_ksys_msgctl(msqid, cmd, uptr);
+}
#endif
static int testmsg(struct msg_msg *msg, long type, int mode)