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| author | Eric Sandeen <sandeen@redhat.com> | 2007-10-16 23:27:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:53 -0700 |
| commit | f44ec6f3f89889a469773b1fd894f8fcc07c29cf (patch) | |
| tree | 3b58f7b094e61c02536c7414906d7e29190979de /fs/minix/itree_v2.c | |
| parent | d8ea6cf89991000ae458e34e36379814cf202555 (diff) | |
| download | linux-f44ec6f3f89889a469773b1fd894f8fcc07c29cf.tar.gz | |
limit minixfs printks on corrupted dir i_size
This attempts to address CVE-2006-6058 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6058 first reported at http://projects.info-pull.com/mokb/MOKB-17-11-2006.html Essentially a corrupted minix dir inode reporting a very large i_size will loop for a very long time in minix_readdir, minix_find_entry, etc, because on EIO they just move on to try the next page. This is under the BKL, printk-storming as well. This can lock up the machine for a very long time. Simply ratelimiting the printks gets things back under control. Make the message a bit more informative while we're here. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Bodo Eggert <7eggert@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/minix/itree_v2.c')
| -rw-r--r-- | fs/minix/itree_v2.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/minix/itree_v2.c b/fs/minix/itree_v2.c index ad8f0dec4ef4..f23010969369 100644 --- a/fs/minix/itree_v2.c +++ b/fs/minix/itree_v2.c @@ -23,12 +23,17 @@ static inline block_t *i_data(struct inode *inode) static int block_to_path(struct inode * inode, long block, int offsets[DEPTH]) { int n = 0; + char b[BDEVNAME_SIZE]; struct super_block *sb = inode->i_sb; if (block < 0) { - printk("minix_bmap: block<0\n"); + printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n", + block, bdevname(sb->s_bdev, b)); } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) { - printk("minix_bmap: block>big\n"); + if (printk_ratelimit()) + printk("MINIX-fs: block_to_path: " + "block %ld too big on dev %s\n", + block, bdevname(sb->s_bdev, b)); } else if (block < 7) { offsets[n++] = block; } else if ((block -= 7) < 256) { |