diff options
Diffstat (limited to 'sysutils/e2fsprogs/files/patch-zzz-CVE-2015-1572-49d0fe2a14f2a23da2fe299643379b8c1d37df73')
| -rw-r--r-- | sysutils/e2fsprogs/files/patch-zzz-CVE-2015-1572-49d0fe2a14f2a23da2fe299643379b8c1d37df73 | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/sysutils/e2fsprogs/files/patch-zzz-CVE-2015-1572-49d0fe2a14f2a23da2fe299643379b8c1d37df73 b/sysutils/e2fsprogs/files/patch-zzz-CVE-2015-1572-49d0fe2a14f2a23da2fe299643379b8c1d37df73 new file mode 100644 index 000000000000..38ca12cc40a5 --- /dev/null +++ b/sysutils/e2fsprogs/files/patch-zzz-CVE-2015-1572-49d0fe2a14f2a23da2fe299643379b8c1d37df73 @@ -0,0 +1,53 @@ +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: libext2fs: fix potential buffer overflow in closefs() + +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> + +diff --git a/lib/ext2fs/closefs.c b/lib/ext2fs/closefs.c +index 1f99113..ab5b2fb 100644 +--- ./lib/ext2fs/closefs.c ++++ ./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; +-- +cgit v0.10.2 + |