convert sendfile{,64} to COMPAT_SYSCALL_DEFINE

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

1 files changed, 42 insertions, 2 deletions

diff --git a/fs/read_write.c b/fs/read_write.c
index dcfd58d95f44..f738e4dccfab 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -853,8 +853,8 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
         return ret;
 }
 
-ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count,
-                    loff_t max)
+static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
+                           size_t count, loff_t max)
 {
         struct fd in, out;
         struct inode *in_inode, *out_inode;
@@ -978,3 +978,43 @@ SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, si
 
         return do_sendfile(out_fd, in_fd, NULL, count, 0);
 }
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd,
+                compat_off_t __user *, offset, compat_size_t, count)
+{
+        loff_t pos;
+        off_t off;
+        ssize_t ret;
+
+        if (offset) {
+                if (unlikely(get_user(off, offset)))
+                        return -EFAULT;
+                pos = off;
+                ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
+                if (unlikely(put_user(pos, offset)))
+                        return -EFAULT;
+                return ret;
+        }
+
+        return do_sendfile(out_fd, in_fd, NULL, count, 0);
+}
+
+COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd,
+                compat_loff_t __user *, offset, compat_size_t, count)
+{
+        loff_t pos;
+        ssize_t ret;
+
+        if (offset) {
+                if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
+                        return -EFAULT;
+                ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
+                if (unlikely(put_user(pos, offset)))
+                        return -EFAULT;
+                return ret;
+        }
+
+        return do_sendfile(out_fd, in_fd, NULL, count, 0);
+}
+#endif