convert vmsplice to COMPAT_SYSCALL_DEFINE

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

1 files changed, 22 insertions, 0 deletions

diff --git a/fs/splice.c b/fs/splice.c
index 718bd0056384..23ade0e5c559 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -31,6 +31,7 @@
 #include <linux/security.h>
 #include <linux/gfp.h>
 #include <linux/socket.h>
+#include <linux/compat.h>
 
 /*
  * Attempt to steal a page from a pipe buffer. This should perhaps go into
@@ -1688,6 +1689,27 @@ SYSCALL_DEFINE4(vmsplice, int, fd, const struct iovec __user *, iov,
         return error;
 }
 
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE4(vmsplice, int, fd, const struct compat_iovec __user *, iov32,
+                    unsigned int, nr_segs, unsigned int, flags)
+{
+        unsigned i;
+        struct iovec __user *iov;
+        if (nr_segs > UIO_MAXIOV)
+                return -EINVAL;
+        iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
+        for (i = 0; i < nr_segs; i++) {
+                struct compat_iovec v;
+                if (get_user(v.iov_base, &iov32[i].iov_base) ||
+                    get_user(v.iov_len, &iov32[i].iov_len) ||
+                    put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
+                    put_user(v.iov_len, &iov[i].iov_len))
+                        return -EFAULT;
+        }
+        return sys_vmsplice(fd, iov, nr_segs, flags);
+}
+#endif
+
 SYSCALL_DEFINE6(splice, int, fd_in, loff_t __user *, off_in,
                 int, fd_out, loff_t __user *, off_out,
                 size_t, len, unsigned int, flags)