|
@@ -1,59 +0,0 @@
|
|
|
-From 49d0fe2a14f2a23da2fe299643379b8c1d37df73 Mon Sep 17 00:00:00 2001
|
|
|
-From: Theodore Ts'o <tytso@mit.edu>
|
|
|
-Date: Fri, 6 Feb 2015 12:46:39 -0500
|
|
|
-Subject: [PATCH] libext2fs: fix potential buffer overflow in closefs()
|
|
|
-
|
|
|
-Upstream commit 49d0fe2a14f2.
|
|
|
-
|
|
|
-The bug fix in f66e6ce4446: "libext2fs: avoid buffer overflow if
|
|
|
-s_first_meta_bg is too big" had a typo in the fix for
|
|
|
-ext2fs_closefs(). In practice most of the security exposure was from
|
|
|
-the openfs path, since this meant if there was a carefully crafted
|
|
|
-file system, buffer overrun would be triggered when the file system was
|
|
|
-opened.
|
|
|
-
|
|
|
-However, if corrupted file system didn't trip over some corruption
|
|
|
-check, and then the file system was modified via tune2fs or debugfs,
|
|
|
-such that the superblock was marked dirty and then written out via the
|
|
|
-closefs() path, it's possible that the buffer overrun could be
|
|
|
-triggered when the file system is closed.
|
|
|
-
|
|
|
-Also clear up a signed vs unsigned warning while we're at it.
|
|
|
-
|
|
|
-Thanks to Nick Kralevich <nnk@google.com> for asking me to look at
|
|
|
-compiler warning in the code in question, which led me to notice the
|
|
|
-bug in f66e6ce4446.
|
|
|
-
|
|
|
-Addresses: CVE-2015-1572
|
|
|
-
|
|
|
-Signed-off-by: Theodore Ts'o <tytso@mit.edu>
|
|
|
-Signed-off-by: Baruch Siach <baruch@tkos.co.il>
|
|
|
----
|
|
|
- lib/ext2fs/closefs.c | 4 ++--
|
|
|
- 1 file changed, 2 insertions(+), 2 deletions(-)
|
|
|
-
|
|
|
-diff --git a/lib/ext2fs/closefs.c b/lib/ext2fs/closefs.c
|
|
|
-index 1f9911311a1a..ab5b2fb2365e 100644
|
|
|
---- a/lib/ext2fs/closefs.c
|
|
|
-+++ b/lib/ext2fs/closefs.c
|
|
|
-@@ -287,7 +287,7 @@ errcode_t ext2fs_flush2(ext2_filsys fs, int flags)
|
|
|
- dgrp_t j;
|
|
|
- #endif
|
|
|
- char *group_ptr;
|
|
|
-- int old_desc_blocks;
|
|
|
-+ blk64_t old_desc_blocks;
|
|
|
- struct ext2fs_numeric_progress_struct progress;
|
|
|
-
|
|
|
- EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
|
|
-@@ -346,7 +346,7 @@ errcode_t ext2fs_flush2(ext2_filsys fs, int flags)
|
|
|
- group_ptr = (char *) group_shadow;
|
|
|
- if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) {
|
|
|
- old_desc_blocks = fs->super->s_first_meta_bg;
|
|
|
-- if (old_desc_blocks > fs->super->s_first_meta_bg)
|
|
|
-+ if (old_desc_blocks > fs->desc_blocks)
|
|
|
- old_desc_blocks = fs->desc_blocks;
|
|
|
- } else
|
|
|
- old_desc_blocks = fs->desc_blocks;
|
|
|
---
|
|
|
-2.1.4
|
|
|
-
|