shmat(2): move compat to native

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 19 insertions, 0 deletions

diff --git a/ipc/shm.c b/ipc/shm.c
index 2e31545035a6..342024de3b9d 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1439,6 +1439,25 @@ SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
 	return (long)ret;
 }
 
+#ifdef CONFIG_COMPAT
+
+#ifndef COMPAT_SHMLBA
+#define COMPAT_SHMLBA	SHMLBA
+#endif
+
+COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
+{
+	unsigned long ret;
+	long err;
+
+	err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
+	if (err)
+		return err;
+	force_successful_syscall_return();
+	return (long)ret;
+}
+#endif
+
 /*
  * detach and kill segment if marked destroyed.
  * The work is done in shm_close.