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Subject[PATCH 36/45] ipc: add shmctl syscall/compat_syscall wrappers
Date
Provide ksys_shmctl() and compat_ksys_shmctl() 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_shmctl() and compat_sys_shmctl().

This patch is part of a series which tries to remove in-kernel calls to
syscalls. On this basis, the syscall entry path can be streamlined.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
ipc/shm.c | 14 ++++++++++++--
ipc/syscall.c | 4 ++--
ipc/util.h | 2 ++
3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/ipc/shm.c b/ipc/shm.c
index e5838e3328dc..0aae3e55bc56 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1045,7 +1045,7 @@ static int shmctl_do_lock(struct ipc_namespace *ns, int shmid, int cmd)
return err;
}

-SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
+long ksys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
{
int err, version;
struct ipc_namespace *ns;
@@ -1099,6 +1099,11 @@ SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
}
}

+SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
+{
+ return ksys_shmctl(shmid, cmd, buf);
+}
+
#ifdef CONFIG_COMPAT

struct compat_shmid_ds {
@@ -1218,7 +1223,7 @@ static int copy_compat_shmid_from_user(struct shmid64_ds *out, void __user *buf,
}
}

-COMPAT_SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, void __user *, uptr)
+long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr)
{
struct ipc_namespace *ns;
struct shmid64_ds sem64;
@@ -1273,6 +1278,11 @@ COMPAT_SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, void __user *, uptr)
}
return err;
}
+
+COMPAT_SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, void __user *, uptr)
+{
+ return compat_ksys_shmctl(shmid, cmd, uptr);
+}
#endif

/*
diff --git a/ipc/syscall.c b/ipc/syscall.c
index b3aa71564815..34bbabc9e672 100644
--- a/ipc/syscall.c
+++ b/ipc/syscall.c
@@ -94,7 +94,7 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
case SHMGET:
return ksys_shmget(first, second, third);
case SHMCTL:
- return sys_shmctl(first, second,
+ return ksys_shmctl(first, second,
(struct shmid_ds __user *) ptr);
default:
return -ENOSYS;
@@ -182,7 +182,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
case SHMGET:
return ksys_shmget(first, (unsigned int)second, third);
case SHMCTL:
- return compat_sys_shmctl(first, second, compat_ptr(ptr));
+ return compat_ksys_shmctl(first, second, compat_ptr(ptr));
}

return -ENOSYS;
diff --git a/ipc/util.h b/ipc/util.h
index 7770bcad1168..16e8b5b8c416 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -245,6 +245,7 @@ long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg);
long ksys_msgget(key_t key, 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);

/* for CONFIG_ARCH_WANT_OLD_COMPAT_IPC */
#ifdef CONFIG_COMPAT
@@ -252,6 +253,7 @@ 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);
+long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr);
#endif /* CONFIG_COMPAT */

#endif
--
2.16.2
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