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authorEric Sandeen <sandeen@redhat.com>2008-01-16 23:36:44 +0200
committerAdrian Bunk <bunk@kernel.org>2008-01-16 23:36:44 +0200
commit51828e03b3b5627ef6a102f75c565bec85cab040 (patch)
tree5fbc098efe6c334020e97cbed86c53c250946482 /fs
parentbb32327b602955604574fbf1e5254b8756b0a151 (diff)
downloadlinux-linaro-stable-51828e03b3b5627ef6a102f75c565bec85cab040.tar.gz
limit minixfs printks on corrupted dir i_size (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. Adrian Bunk: Backported to 2.6.16. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Adrian Bunk <bunk@kernel.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/minix/itree_v1.c9
-rw-r--r--fs/minix/itree_v2.c9
2 files changed, 14 insertions, 4 deletions
diff --git a/fs/minix/itree_v1.c b/fs/minix/itree_v1.c
index 656b1347a25b..2f167044d6c0 100644
--- a/fs/minix/itree_v1.c
+++ b/fs/minix/itree_v1.c
@@ -23,11 +23,16 @@ 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];
if (block < 0) {
- printk("minix_bmap: block<0\n");
+ printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
+ block, bdevname(inode->i_sb->s_bdev, b));
} else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
- 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(inode->i_sb->s_bdev, b));
} else if (block < 7) {
offsets[n++] = block;
} else if ((block -= 7) < 512) {
diff --git a/fs/minix/itree_v2.c b/fs/minix/itree_v2.c
index 9adcdc754e0f..65f74d4db931 100644
--- a/fs/minix/itree_v2.c
+++ b/fs/minix/itree_v2.c
@@ -23,11 +23,16 @@ 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];
if (block < 0) {
- printk("minix_bmap: block<0\n");
+ printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
+ block, bdevname(inode->i_sb->s_bdev, b));
} else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
- 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(inode->i_sb->s_bdev, b));
} else if (block < 7) {
offsets[n++] = block;
} else if ((block -= 7) < 256) {