| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 18 May 2011 11:29:23 +0800
From: Yongqiang Yang <xiaoqiangnk@...il.com>
To: Eric Sandeen <sandeen@...hat.com>
Cc: Ext4 Developers List <linux-ext4@...r.kernel.org>, xfs@....sgi.com
Subject: Re: [PATCH] xfstests:Make 225 compare map and fiemap at each block.
Hi Eric,
Could you have a look at this patch?
On Sat, May 14, 2011 at 11:47 AM, Yongqiang Yang <xiaoqiangnk@...il.com> wrote:
> Hi All,
>
> Due to my carelessness, I induced a ugly patch to ext4's fiemap, but
> 225 could not find it. So I looked into the 225 and could not figure out
> logic in compare_map_and_fiemap(), which seemed to mixed extents with
> blocks. Then I made 225 compare map and fiemap at each block, the new
> 225 can find another bug in ext4's fiemap.
>
> The new 225 works well on ext3 and ext4 with both 1K and 4K block. However,
> it report fiemap error on xfs with 4K block. My working tree is 2.6.39-rc3
> pulled from Ted's tree. The error message is as follows.
>
> QA output created by 225
> fiemap run without preallocation, with sync
> +map is 'DDHDHHDHHDHDDHDDHDDHHDHDDHDDDDDDHHDDDHHHHDH
> DDDDDDDDHDDHHHDDDHDDHHDDDDDDHHHHHHDDHHHHHDHDHDHDD
> DHDDHD'
> +logical: [ 0.. 15] phys: 12.. 27 flags: 0x000 tot: 16
> +logical: [ 17.. 31] phys: 29.. 43 flags: 0x000 tot: 15
> +logical: [ 34.. 63] phys: 46.. 75 flags: 0x000 tot: 30
> +logical: [ 65.. 95] phys: 77.. 107 flags: 0x001 tot: 31
> +Problem comparing fiemap and map
> fiemap run without preallocation or sync
> +map is 'DDHDHHDHHDHDDHDDHDDHHDHDDHDDDDDDHHDDDHHHHDH
> DDDDDDDDHDDHHHDDDHDDHHDDDDDDHHHHHHDDHHHHHDHDHDHDD
> DHDDHD'
> +logical: [ 0.. 15] phys: 0.. 15 flags: 0x006 tot: 16
> +Problem comparing fiemap and map
> Ran: 225
> Failures: 225
> Failed 1 of 1 tests
>
> I am not sure this is a bug in new 225 or xfs.
>
> Yongqiang.
>
> Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
> ---
> src/fiemap-tester.c | 223 ++++++++++++++++++++++++++++----------------------
> 1 files changed, 125 insertions(+), 98 deletions(-)
>
> diff --git a/src/fiemap-tester.c b/src/fiemap-tester.c
> index 1663f84..99bb5ce 100644
> --- a/src/fiemap-tester.c
> +++ b/src/fiemap-tester.c
> @@ -14,6 +14,9 @@
> * You should have received a copy of the GNU General Public License
> * along with this program; if not, write the Free Software Foundation,
> * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
> + *
> + * Compare map and fiemap at each block,
> + * Yongqiang Yang <xiaoqiangnk@...il.com>, 2011
> */
>
> #include <stdio.h>
> @@ -57,7 +60,7 @@ generate_file_mapping(int blocks, int prealloc)
> int num_types = 2, cur_block = 0;
> int i = 0;
>
> - map = malloc(sizeof(char) * blocks);
> + map = malloc(sizeof(char) * (blocks + 1));
> if (!map)
> return NULL;
>
> @@ -80,7 +83,8 @@ generate_file_mapping(int blocks, int prealloc)
> }
> cur_block++;
> }
> -
> +
> + map[blocks] = 0;
> return map;
> }
>
> @@ -247,55 +251,36 @@ check_flags(struct fiemap *fiemap, int blocksize)
> }
>
> static int
> -check_data(struct fiemap *fiemap, __u64 logical_offset, int blocksize,
> +check_data(struct fiemap_extent * extent , __u64 logical_offset, int
> blocksize,
> int last, int prealloc)
> {
> - struct fiemap_extent *extent;
> - __u64 orig_offset = logical_offset;
> - int c, found = 0;
> -
> - for (c = 0; c < fiemap->fm_mapped_extents; c++) {
> - __u64 start, end;
> - extent = &fiemap->fm_extents[c];
> -
> - start = extent->fe_logical;
> - end = extent->fe_logical + extent->fe_length;
> -
> - if (logical_offset > end)
> - continue;
> -
> - if (logical_offset + blocksize < start)
> - break;
> -
> - if (logical_offset >= start &&
> - logical_offset < end) {
> - if (prealloc &&
> - !(extent->fe_flags & FIEMAP_EXTENT_UNWRITTEN)) {
> - printf("ERROR: preallocated extent is not "
> - "marked with FIEMAP_EXTENT_UNWRITTEN: "
> - "%llu\n",
> - (unsigned long long)
> - (start / blocksize));
> - return -1;
> - }
> -
> - if (logical_offset + blocksize > end) {
> - logical_offset = end+1;
> - continue;
> - } else {
> - found = 1;
> - break;
> - }
> + int found = 0;
> + __u64 start, end;
> +
> + start = extent->fe_logical;
> + end = extent->fe_logical + extent->fe_length;
> +
> + if (logical_offset >= start &&
> + logical_offset < end) {
> + if (prealloc &&
> + !(extent->fe_flags & FIEMAP_EXTENT_UNWRITTEN)) {
> + printf("ERROR: preallocated extent is not "
> + "marked with FIEMAP_EXTENT_UNWRITTEN: "
> + "%llu\n",
> + (unsigned long long)
> + (start / blocksize));
> + return -1;
> }
> + found = 1;
> }
> -
> +
> if (!found) {
> printf("ERROR: couldn't find extent at %llu\n",
> - (unsigned long long)(orig_offset / blocksize));
> + (unsigned long long)(logical_offset / blocksize));
> } else if (last &&
> - !(fiemap->fm_extents[c].fe_flags & FIEMAP_EXTENT_LAST)) {
> + !(extent->fe_flags & FIEMAP_EXTENT_LAST)) {
> printf("ERROR: last extent not marked as last: %llu\n",
> - (unsigned long long)(orig_offset / blocksize));
> + (unsigned long long)(logical_offset / blocksize));
> found = 0;
> }
>
> @@ -370,37 +355,26 @@ check_weird_fs_hole(int fd, __u64
> logical_offset, int blocksize)
> }
>
> static int
> -check_hole(struct fiemap *fiemap, int fd, __u64 logical_offset, int blocksize)
> +check_hole(struct fiemap_extent *extent, int fd, __u64
> logical_offset, int blocksize)
> {
> - struct fiemap_extent *extent;
> - int c;
> + __u64 start, end;
>
> - for (c = 0; c < fiemap->fm_mapped_extents; c++) {
> - __u64 start, end;
> - extent = &fiemap->fm_extents[c];
> + start = extent->fe_logical;
> + end = extent->fe_logical + extent->fe_length;
>
> - start = extent->fe_logical;
> - end = extent->fe_logical + extent->fe_length;
> + if (logical_offset >= start &&
> + logical_offset < end) {
>
> - if (logical_offset > end)
> - continue;
> - if (logical_offset + blocksize < start)
> - break;
> + if (check_weird_fs_hole(fd, logical_offset,
> + blocksize) == 0)
> + return 0;
>
> - if (logical_offset >= start &&
> - logical_offset < end) {
> -
> - if (check_weird_fs_hole(fd, logical_offset,
> - blocksize) == 0)
> - break;
> -
> - printf("ERROR: found an allocated extent where a hole "
> - "should be: %llu\n",
> - (unsigned long long)(start / blocksize));
> - return -1;
> - }
> + printf("ERROR: found an allocated extent where a hole "
> + "should be: %llu\n",
> + (unsigned long long)(start / blocksize));
> + return -1;
> }
> -
> +
> return 0;
> }
>
> @@ -423,9 +397,11 @@ compare_fiemap_and_map(int fd, char *map, int
> blocks, int blocksize, int syncfil
> {
> struct fiemap *fiemap;
> char *fiebuf;
> - int blocks_to_map, ret, cur_extent = 0, last_data;
> + int blocks_to_map, ret, last_data = -1;
> __u64 map_start, map_length;
> int i, c;
> + int cur_block = 0;
> + int last_found = 0;
>
> if (query_fiemap_count(fd, blocks, blocksize) < 0)
> return -1;
> @@ -451,8 +427,11 @@ compare_fiemap_and_map(int fd, char *map, int
> blocks, int blocksize, int syncfil
> fiemap->fm_extent_count = blocks_to_map;
> fiemap->fm_mapped_extents = 0;
>
> + /* check fiemap by looking at each block. */
> do {
> - fiemap->fm_start = map_start;
> + int nr_extents;
> +
> + fiemap->fm_start = cur_block * blocksize;
> fiemap->fm_length = map_length;
>
> ret = ioctl(fd, FS_IOC_FIEMAP, (unsigned long)fiemap);
> @@ -465,45 +444,93 @@ compare_fiemap_and_map(int fd, char *map, int
> blocks, int blocksize, int syncfil
> if (check_flags(fiemap, blocksize))
> goto error;
>
> - for (i = cur_extent, c = 1; i < blocks; i++, c++) {
> - __u64 logical_offset = i * blocksize;
> + nr_extents = fiemap->fm_mapped_extents;
> + if (nr_extents == 0) {
> + int block = cur_block + (map_length - 1)/ blocksize;
> + for (; cur_block <= block && cur_block < blocks; cur_block++) {
> + /* check hole */
> + if (map[cur_block] != 'H') {
> + printf("ERROR: map[%d] should not be "
> + "a hole\n", cur_block);
> + goto error;
> + }
> + }
> + continue;
> + }
>
> - if (c > fiemap->fm_mapped_extents) {
> - i++;
> - break;
> + for (c = 0; c < nr_extents; c++) {
> + __u64 offset;
> + int block;
> + struct fiemap_extent *extent;
> +
> + if (last_found) {
> + printf("ERROR: there is extent after"
> + "the last extent\n");
> + goto error;
> }
>
> - switch (map[i]) {
> - case 'D':
> - if (check_data(fiemap, logical_offset,
> - blocksize, last_data == i, 0))
> - goto error;
> - break;
> - case 'H':
> - if (check_hole(fiemap, fd, logical_offset,
> - blocksize))
> - goto error;
> - break;
> - case 'P':
> - if (check_data(fiemap, logical_offset,
> - blocksize, last_data == i, 1))
> + extent = &fiemap->fm_extents[c];
> + offset = extent->fe_logical;
> + block = offset / blocksize;
> +
> + /* check hole. */
> + for (; cur_block < block; cur_block++) {
> + if (map[cur_block] != 'H') {
> + printf("ERROR: map[%d] should not be "
> + "a hole\n", cur_block);
> goto error;
> - break;
> - default:
> - printf("ERROR: weird value in map: %c\n",
> - map[i]);
> + }
> + }
> +
> + offset = extent->fe_logical + extent->fe_length;
> + block = offset / blocksize;
> +
> + if (block > blocks) {
> + printf("ERROR: there are extents beyond EOF\n");
> goto error;
> }
> +
> + /* check data */
> + for (; cur_block < block; cur_block++) {
> + offset = (__u64)cur_block * blocksize;
> + last_found = (last_data == cur_block);
> + switch (map[cur_block]) {
> + case 'D':
> + if (check_data(extent, offset,
> + blocksize, last_found, 0))
> + goto error;
> + break;
> + case 'H':
> + if (check_hole(extent, fd, offset,
> + blocksize));
> + goto error;
> + break;
> +
> + case 'P':
> + if (check_data(extent, offset,
> + blocksize, last_found, 1))
> + goto error;
> + break;
> + default:
> + printf("ERROR: weird value in map: %c\n",
> + map[i]);
> + goto error;
> + }
> + }
> }
> - cur_extent = i;
> - map_start = i * blocksize;
> - } while (cur_extent < blocks);
> + } while (cur_block < blocks);
>
> - ret = 0;
> - return ret;
> + if (!last_found && last_data != -1) {
> + printf("ERROR: find no last extent\n");
> + goto error;
> + }
> +
> + free(fiebuf);
> + return 0;
> error:
> printf("map is '%s'\n", map);
> show_extents(fiemap, blocksize);
> + free(fiebuf);
> return -1;
> }
>
> --
> 1.7.5.1
>
> --
> Best Wishes
> Yongqiang Yang
>
--
Best Wishes
Yongqiang Yang
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists