[patch 02/16] ext: Avoid printk floods in the face of directory corruption (CVE-2008-3528)

[patch 02/16] ext: Avoid printk floods in the face of directory corruption (CVE-2008-3528)

[Greg KH]

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2.6.25-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Eric Sandeen <sandeen@redhat.com>

This is a trivial backport of the following upstream commits:

- bd39597cbd42a784105a04010100e27267481c67 (ext2)
- cdbf6dba28e8e6268c8420857696309470009fd9 (ext3)
- 9d9f177572d9e4eba0f2e18523b44f90dd51fe74 (ext4)

This addresses CVE-2008-3528

ext[234]: Avoid printk floods in the face of directory corruption

Note: some people thinks this represents a security bug, since it
might make the system go away while it is printing a large number of
console messages, especially if a serial console is involved.  Hence,
it has been assigned CVE-2008-3528, but it requires that the attacker
either has physical access to your machine to insert a USB disk with a
corrupted filesystem image (at which point why not just hit the power
button), or is otherwise able to convince the system administrator to
mount an arbitrary filesystem image (at which point why not just
include a setuid shell or world-writable hard disk device file or some
such).  Me, I think they're just being silly. --tytso

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org
Cc: Eugene Teo <eugeneteo@kernel.sg>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 fs/ext2/dir.c |   60 +++++++++++++++++++++++++++++++++-------------------------
 fs/ext3/dir.c |   10 ++++++---
 fs/ext4/dir.c |   11 +++++++---
 3 files changed, 50 insertions(+), 31 deletions(-)

--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -103,7 +103,7 @@ static int ext2_commit_chunk(struct page
 	return err;
 }
 
-static void ext2_check_page(struct page *page)
+static void ext2_check_page(struct page *page, int quiet)
 {
 	struct inode *dir = page->mapping->host;
 	struct super_block *sb = dir->i_sb;
@@ -146,10 +146,10 @@ out:
 	/* Too bad, we had an error */
 
 Ebadsize:
-	ext2_error(sb, "ext2_check_page",
-		"size of directory #%lu is not a multiple of chunk size",
-		dir->i_ino
-	);
+	if (!quiet)
+		ext2_error(sb, __func__,
+			"size of directory #%lu is not a multiple "
+			"of chunk size", dir->i_ino);
 	goto fail;
 Eshort:
 	error = "rec_len is smaller than minimal";
@@ -166,32 +166,36 @@ Espan:
 Einumber:
 	error = "inode out of bounds";
 bad_entry:
-	ext2_error (sb, "ext2_check_page", "bad entry in directory #%lu: %s - "
-		"offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
-		dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
-		(unsigned long) le32_to_cpu(p->inode),
-		rec_len, p->name_len);
+	if (!quiet)
+		ext2_error(sb, __func__, "bad entry in directory #%lu: : %s - "
+			"offset=%lu, inode=%lu, rec_len=%d, name_len=%d",
+			dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
+			(unsigned long) le32_to_cpu(p->inode),
+			rec_len, p->name_len);
 	goto fail;
 Eend:
-	p = (ext2_dirent *)(kaddr + offs);
-	ext2_error (sb, "ext2_check_page",
-		"entry in directory #%lu spans the page boundary"
-		"offset=%lu, inode=%lu",
-		dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
-		(unsigned long) le32_to_cpu(p->inode));
+	if (!quiet) {
+		p = (ext2_dirent *)(kaddr + offs);
+		ext2_error(sb, "ext2_check_page",
+			"entry in directory #%lu spans the page boundary"
+			"offset=%lu, inode=%lu",
+			dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
+			(unsigned long) le32_to_cpu(p->inode));
+	}
 fail:
 	SetPageChecked(page);
 	SetPageError(page);
 }
 
-static struct page * ext2_get_page(struct inode *dir, unsigned long n)
+static struct page * ext2_get_page(struct inode *dir, unsigned long n,
+				   int quiet)
 {
 	struct address_space *mapping = dir->i_mapping;
 	struct page *page = read_mapping_page(mapping, n, NULL);
 	if (!IS_ERR(page)) {
 		kmap(page);
 		if (!PageChecked(page))
-			ext2_check_page(page);
+			ext2_check_page(page, quiet);
 		if (PageError(page))
 			goto fail;
 	}
@@ -292,7 +296,7 @@ ext2_readdir (struct file * filp, void *
 	for ( ; n < npages; n++, offset = 0) {
 		char *kaddr, *limit;
 		ext2_dirent *de;
-		struct page *page = ext2_get_page(inode, n);
+		struct page *page = ext2_get_page(inode, n, 0);
 
 		if (IS_ERR(page)) {
 			ext2_error(sb, __FUNCTION__,
@@ -361,6 +365,7 @@ struct ext2_dir_entry_2 * ext2_find_entr
 	struct page *page = NULL;
 	struct ext2_inode_info *ei = EXT2_I(dir);
 	ext2_dirent * de;
+	int dir_has_error = 0;
 
 	if (npages == 0)
 		goto out;
@@ -374,7 +379,7 @@ struct ext2_dir_entry_2 * ext2_find_entr
 	n = start;
 	do {
 		char *kaddr;
-		page = ext2_get_page(dir, n);
+		page = ext2_get_page(dir, n, dir_has_error);
 		if (!IS_ERR(page)) {
 			kaddr = page_address(page);
 			de = (ext2_dirent *) kaddr;
@@ -391,7 +396,9 @@ struct ext2_dir_entry_2 * ext2_find_entr
 				de = ext2_next_entry(de);
 			}
 			ext2_put_page(page);
-		}
+		} else
+			dir_has_error = 1;
+
 		if (++n >= npages)
 			n = 0;
 		/* next page is past the blocks we've got */
@@ -414,7 +421,7 @@ found:
 
 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p)
 {
-	struct page *page = ext2_get_page(dir, 0);
+	struct page *page = ext2_get_page(dir, 0, 0);
 	ext2_dirent *de = NULL;
 
 	if (!IS_ERR(page)) {
@@ -487,7 +494,7 @@ int ext2_add_link (struct dentry *dentry
 	for (n = 0; n <= npages; n++) {
 		char *dir_end;
 
-		page = ext2_get_page(dir, n);
+		page = ext2_get_page(dir, n, 0);
 		err = PTR_ERR(page);
 		if (IS_ERR(page))
 			goto out;
@@ -655,14 +662,17 @@ int ext2_empty_dir (struct inode * inode
 {
 	struct page *page = NULL;
 	unsigned long i, npages = dir_pages(inode);
+	int dir_has_error = 0;
 
 	for (i = 0; i < npages; i++) {
 		char *kaddr;
 		ext2_dirent * de;
-		page = ext2_get_page(inode, i);
+		page = ext2_get_page(inode, i, dir_has_error);
 
-		if (IS_ERR(page))
+		if (IS_ERR(page)) {
+			dir_has_error = 1;
 			continue;
+		}
 
 		kaddr = page_address(page);
 		de = (ext2_dirent *)kaddr;
--- a/fs/ext3/dir.c
+++ b/fs/ext3/dir.c
@@ -102,6 +102,7 @@ static int ext3_readdir(struct file * fi
 	int err;
 	struct inode *inode = filp->f_path.dentry->d_inode;
 	int ret = 0;
+	int dir_has_error = 0;
 
 	sb = inode->i_sb;
 
@@ -148,9 +149,12 @@ static int ext3_readdir(struct file * fi
 		 * of recovering data when there's a bad sector
 		 */
 		if (!bh) {
-			ext3_error (sb, "ext3_readdir",
-				"directory #%lu contains a hole at offset %lu",
-				inode->i_ino, (unsigned long)filp->f_pos);
+			if (!dir_has_error) {
+				ext3_error(sb, __func__, "directory #%lu "
+					"contains a hole at offset %lld",
+					inode->i_ino, filp->f_pos);
+				dir_has_error = 1;
+			}
 			/* corrupt size?  Maybe no more blocks to read */
 			if (filp->f_pos > inode->i_blocks << 9)
 				break;
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -102,6 +102,7 @@ static int ext4_readdir(struct file * fi
 	int err;
 	struct inode *inode = filp->f_path.dentry->d_inode;
 	int ret = 0;
+	int dir_has_error = 0;
 
 	sb = inode->i_sb;
 
@@ -147,9 +148,13 @@ static int ext4_readdir(struct file * fi
 		 * of recovering data when there's a bad sector
 		 */
 		if (!bh) {
-			ext4_error (sb, "ext4_readdir",
-				"directory #%lu contains a hole at offset %lu",
-				inode->i_ino, (unsigned long)filp->f_pos);
+			if (!dir_has_error) {
+				ext4_error(sb, __func__, "directory #%lu "
+					   "contains a hole at offset %Lu",
+					   inode->i_ino,
+					   (unsigned long long) filp->f_pos);
+				dir_has_error = 1;
+			}
 			/* corrupt size?  Maybe no more blocks to read */
 			if (filp->f_pos > inode->i_blocks << 9)
 				break;

-- 

Re: [patch 02/16] ext: Avoid printk floods in the face of directory corruption (CVE-2008-3528)

[Eugene Teo]

Likewise, please change the description to:

"A very large directory with many read failures (either due to storage
problems, or due to invalid size & blocks from corruption) will generate
a printk storm as the filesystem continues to try to read all the
blocks. This flood of messages can tie up the box until it is complete -
which may be a very long time, especially for very large corrupted values.

This is fixed by only reporting the corruption once each time we try to
read the directory."

Thanks, Eugene