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authorAl Viro <viro@zeniv.linux.org.uk>2017-04-09 00:18:48 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2017-04-17 18:52:26 +0200
commitf50298556436ef0f32257b8ea19b112f9028b0a5 (patch)
tree32c3e7022475150ad1cbfb87f9d29c23f446ee05 /fs/compat.c
parentfhandle: move compat syscalls from compat.c (diff)
downloadlinux-f50298556436ef0f32257b8ea19b112f9028b0a5.tar.xz
linux-f50298556436ef0f32257b8ea19b112f9028b0a5.zip
move compat_rw_copy_check_uvector() over to fs/read_write.c
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/compat.c')
-rw-r--r--fs/compat.c76
1 files changed, 0 insertions, 76 deletions
diff --git a/fs/compat.c b/fs/compat.c
index 3e94559c452e..ca2f3ca5dacd 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -54,82 +54,6 @@
#include <asm/ioctls.h>
#include "internal.h"
-/* A write operation does a read from user space and vice versa */
-#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
-
-ssize_t compat_rw_copy_check_uvector(int type,
- const struct compat_iovec __user *uvector, unsigned long nr_segs,
- unsigned long fast_segs, struct iovec *fast_pointer,
- struct iovec **ret_pointer)
-{
- compat_ssize_t tot_len;
- struct iovec *iov = *ret_pointer = fast_pointer;
- ssize_t ret = 0;
- int seg;
-
- /*
- * SuS says "The readv() function *may* fail if the iovcnt argument
- * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
- * traditionally returned zero for zero segments, so...
- */
- if (nr_segs == 0)
- goto out;
-
- ret = -EINVAL;
- if (nr_segs > UIO_MAXIOV)
- goto out;
- if (nr_segs > fast_segs) {
- ret = -ENOMEM;
- iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
- if (iov == NULL)
- goto out;
- }
- *ret_pointer = iov;
-
- ret = -EFAULT;
- if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
- goto out;
-
- /*
- * Single unix specification:
- * We should -EINVAL if an element length is not >= 0 and fitting an
- * ssize_t.
- *
- * In Linux, the total length is limited to MAX_RW_COUNT, there is
- * no overflow possibility.
- */
- tot_len = 0;
- ret = -EINVAL;
- for (seg = 0; seg < nr_segs; seg++) {
- compat_uptr_t buf;
- compat_ssize_t len;
-
- if (__get_user(len, &uvector->iov_len) ||
- __get_user(buf, &uvector->iov_base)) {
- ret = -EFAULT;
- goto out;
- }
- if (len < 0) /* size_t not fitting in compat_ssize_t .. */
- goto out;
- if (type >= 0 &&
- !access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
- ret = -EFAULT;
- goto out;
- }
- if (len > MAX_RW_COUNT - tot_len)
- len = MAX_RW_COUNT - tot_len;
- tot_len += len;
- iov->iov_base = compat_ptr(buf);
- iov->iov_len = (compat_size_t) len;
- uvector++;
- iov++;
- }
- ret = tot_len;
-
-out:
- return ret;
-}
-
struct compat_ncp_mount_data {
compat_int_t version;
compat_uint_t ncp_fd;