diff options
Diffstat (limited to 'tools/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch')
| -rw-r--r-- | tools/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/tools/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch b/tools/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch new file mode 100644 index 0000000000..e5a76161f2 --- /dev/null +++ b/tools/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch @@ -0,0 +1,50 @@ +From ab51d587bb9b229b1fade1afd02e1574c1ba5c76 Mon Sep 17 00:00:00 2001 +From: Lukas Czerner <lczerner@redhat.com> +Date: Thu, 21 Apr 2022 19:31:48 +0200 +Subject: libext2fs: add sanity check to extent manipulation + +It is possible to have a corrupted extent tree in such a way that a leaf +node contains zero extents in it. Currently if that happens and we try +to traverse the tree we can end up accessing wrong data, or possibly +even uninitialized memory. Make sure we don't do that. + +Additionally make sure that we have a sane number of bytes passed to +memmove() in ext2fs_extent_delete(). + +Note that e2fsck is currently unable to spot and fix such corruption in +pass1. + +Signed-off-by: Lukas Czerner <lczerner@redhat.com> +Reported-by: Nils Bars <nils_bars@t-online.de> +Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2068113 +Addresses: CVE-2022-1304 +Addresses-Debian-Bug: #1010263 +Signed-off-by: Theodore Ts'o <tytso@mit.edu> +--- + lib/ext2fs/extent.c | 8 ++++++++ + 1 file changed, 8 insertions(+) + +--- a/lib/ext2fs/extent.c ++++ b/lib/ext2fs/extent.c +@@ -495,6 +495,10 @@ retry: + ext2fs_le16_to_cpu(eh->eh_entries); + newpath->max_entries = ext2fs_le16_to_cpu(eh->eh_max); + ++ /* Make sure there is at least one extent present */ ++ if (newpath->left <= 0) ++ return EXT2_ET_EXTENT_NO_DOWN; ++ + if (path->left > 0) { + ix++; + newpath->end_blk = ext2fs_le32_to_cpu(ix->ei_block); +@@ -1630,6 +1634,10 @@ errcode_t ext2fs_extent_delete(ext2_exte + + cp = path->curr; + ++ /* Sanity check before memmove() */ ++ if (path->left < 0) ++ return EXT2_ET_EXTENT_LEAF_BAD; ++ + if (path->left) { + memmove(cp, cp + sizeof(struct ext3_extent_idx), + path->left * sizeof(struct ext3_extent_idx)); |