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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-20 21:25:57 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:27 +0200
commit078faac9e8b6c8124bc012bbf97cca59caf6d4ea (patch)
tree565af5f9110fd70f649f41af3b296077fd3aa646 /ipc
parente340db56483b6e10bd5e5f281071876808801a41 (diff)
downloadlinux-078faac9e8b6c8124bc012bbf97cca59caf6d4ea.tar.gz
ipc: add msgrcv syscall/compat_syscall wrappers
Provide ksys_msgrcv() and compat_ksys_msgrcv() 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_msgrcv() and compat_sys_msgrcv(). 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/msg.c19
-rw-r--r--ipc/syscall.c8
-rw-r--r--ipc/util.h4
3 files changed, 24 insertions, 7 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index 5b026868df07..abc5826270a6 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -1150,10 +1150,16 @@ out_unlock1:
return bufsz;
}
+long ksys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz,
+ long msgtyp, int msgflg)
+{
+ return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
+}
+
SYSCALL_DEFINE5(msgrcv, int, msqid, struct msgbuf __user *, msgp, size_t, msgsz,
long, msgtyp, int, msgflg)
{
- return do_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg, do_msg_fill);
+ return ksys_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg);
}
#ifdef CONFIG_COMPAT
@@ -1171,12 +1177,19 @@ static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bu
return msgsz;
}
-COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
- compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg)
+long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
+ compat_long_t msgtyp, int msgflg)
{
return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
msgflg, compat_do_msg_fill);
}
+
+COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
+ compat_ssize_t, msgsz, compat_long_t, msgtyp,
+ int, msgflg)
+{
+ return compat_ksys_msgrcv(msqid, msgp, msgsz, msgtyp, msgflg);
+}
#endif
int msg_init_ns(struct ipc_namespace *ns)
diff --git a/ipc/syscall.c b/ipc/syscall.c
index aa29b0802e26..0228c7afd882 100644
--- a/ipc/syscall.c
+++ b/ipc/syscall.c
@@ -59,11 +59,11 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
(struct ipc_kludge __user *) ptr,
sizeof(tmp)))
return -EFAULT;
- return sys_msgrcv(first, tmp.msgp, second,
+ return ksys_msgrcv(first, tmp.msgp, second,
tmp.msgtyp, third);
}
default:
- return sys_msgrcv(first,
+ return ksys_msgrcv(first,
(struct msgbuf __user *) ptr,
second, fifth, third);
}
@@ -156,10 +156,10 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
return -EINVAL;
if (copy_from_user(&ipck, uptr, sizeof(ipck)))
return -EFAULT;
- return compat_sys_msgrcv(first, ipck.msgp, second,
+ return compat_ksys_msgrcv(first, ipck.msgp, second,
ipck.msgtyp, third);
}
- return compat_sys_msgrcv(first, ptr, second, fifth, third);
+ return compat_ksys_msgrcv(first, ptr, second, fifth, third);
}
case MSGGET:
return ksys_msgget(first, second);
diff --git a/ipc/util.h b/ipc/util.h
index 47837b4af3f2..c16aceb1bdec 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -244,6 +244,8 @@ 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_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
+long ksys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz,
+ long msgtyp, int msgflg);
long ksys_shmget(key_t key, size_t size, int shmflg);
long ksys_shmdt(char __user *shmaddr);
long ksys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
@@ -255,6 +257,8 @@ long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems,
const struct compat_timespec __user *timeout);
long compat_ksys_semctl(int semid, int semnum, int cmd, int arg);
long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr);
+long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
+ compat_long_t msgtyp, int msgflg);
long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr);
#endif /* CONFIG_COMPAT */