Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f44ec6f3f89889a469773b1fd894f8fcc07c29cf
Commit: f44ec6f3f89889a469773b1fd894f8fcc07c29cf
Parent: d8ea6cf89991000ae458e34e36379814cf202555
Author: Eric Sandeen <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 16 23:27:15 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed Oct 17 08:42:53 2007 -0700
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 <[EMAIL PROTECTED]>
Cc: Bodo Eggert <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/minix/itree_v1.c | 9 +++++++--
fs/minix/itree_v2.c | 9 +++++++--
2 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/fs/minix/itree_v1.c b/fs/minix/itree_v1.c
index 1a5f3bf..82d6554 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 ad8f0de..f230109 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) {
-
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