ipc: add semctl syscall/compat_syscall wrappers

Provide ksys_semctl() and compat_ksys_semctl() 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_semctl() and compat_sys_semctl().

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>

diff --git a/ipc/sem.c b/ipc/sem.c
index 2e5f7ec7a7db97beb7e2c64640f5499446d53aaf..1cf56279a84c7f79cec2be8f11b9600f41249d34 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1581,7 +1581,7 @@ out_up:
        return err;
 }
 
-SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
+long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg)
 {
        int version;
        struct ipc_namespace *ns;
@@ -1635,6 +1635,11 @@ SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
        }
 }
 
+SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
+{
+       return ksys_semctl(semid, semnum, cmd, arg);
+}
+
 #ifdef CONFIG_COMPAT
 
 struct compat_semid_ds {
@@ -1683,7 +1688,7 @@ static int copy_compat_semid_to_user(void __user *buf, struct semid64_ds *in,
        }
 }
 
-COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
+long compat_ksys_semctl(int semid, int semnum, int cmd, int arg)
 {
        void __user *p = compat_ptr(arg);
        struct ipc_namespace *ns;
@@ -1727,6 +1732,11 @@ COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
                return -EINVAL;
        }
 }
+
+COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
+{
+       return compat_ksys_semctl(semid, semnum, cmd, arg);
+}
 #endif
 
 /* If the task doesn't already have a undo_list, then allocate one

diff --git a/ipc/syscall.c b/ipc/syscall.c
index 21fcdf0b4836b4e7dc7d7bd779c9d131e7eea425..a536cca37661a1fe75ebe915ad63dbd00b4df86a 100644 (file)
--- a/ipc/syscall.c
+++ b/ipc/syscall.c
@@ -42,7 +42,7 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
                        return -EINVAL;
                if (get_user(arg, (unsigned long __user *) ptr))
                        return -EFAULT;
-               return sys_semctl(first, second, third, arg);
+               return ksys_semctl(first, second, third, arg);
        }
 
        case MSGSND:
@@ -138,7 +138,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
                        return -EINVAL;
                if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
                        return -EFAULT;
-               return compat_sys_semctl(first, second, third, pad);
+               return compat_ksys_semctl(first, second, third, pad);
 
        case MSGSND:
                return compat_sys_msgsnd(first, ptr, second, third);

diff --git a/ipc/util.h b/ipc/util.h
index 0f07056e5a732927b560e26d1f82ccee09bfa11a..1f1109b83437447f3bf1b8265b41db42dde6f809 100644 (file)
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -241,12 +241,14 @@ long ksys_semtimedop(int semid, struct sembuf __user *tsops,
                     unsigned int nsops,
                     const struct timespec __user *timeout);
 long ksys_semget(key_t key, int nsems, int semflg);
+long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg);
 
 /* for CONFIG_ARCH_WANT_OLD_COMPAT_IPC */
 #ifdef CONFIG_COMPAT
 long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems,
                            unsigned int nsops,
                            const struct compat_timespec __user *timeout);
+long compat_ksys_semctl(int semid, int semnum, int cmd, int arg);
 #endif /* CONFIG_COMPAT */
 
 #endif