Out-of-bounds read/write vulnerability. Issue leads to segmentation fault and possibly arbitrary code execution via a specially crafted filesystem.
Signed-off-by: Christian Melki <[email protected]> --- ...-sanity-check-to-extent-manipulation.patch | 51 +++++++++++++++++++ patches/e2fsprogs-1.46.5/series | 4 ++ 2 files changed, 55 insertions(+) create mode 100644 patches/e2fsprogs-1.46.5/0001-libext2fs-add-sanity-check-to-extent-manipulation.patch create mode 100644 patches/e2fsprogs-1.46.5/series diff --git a/patches/e2fsprogs-1.46.5/0001-libext2fs-add-sanity-check-to-extent-manipulation.patch b/patches/e2fsprogs-1.46.5/0001-libext2fs-add-sanity-check-to-extent-manipulation.patch new file mode 100644 index 000000000..979dbb236 --- /dev/null +++ b/patches/e2fsprogs-1.46.5/0001-libext2fs-add-sanity-check-to-extent-manipulation.patch @@ -0,0 +1,51 @@ +From: Lukas Czerner <[email protected]> +Date: Thu, 21 Apr 2022 19:31:48 +0200 +Subject: [PATCH] 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 <[email protected]> +Reported-by: Nils Bars <[email protected]> +Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2068113 +Addresses: CVE-2022-1304 +Addresses-Debian-Bug: #1010263 +Signed-off-by: Theodore Ts'o <[email protected]> +--- + lib/ext2fs/extent.c | 8 ++++++++ + 1 file changed, 8 insertions(+) + +diff --git a/lib/ext2fs/extent.c b/lib/ext2fs/extent.c +index b324c7b0f8c8..1a206a16c13f 100644 +--- 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_extent_handle_t handle, int flags) + + 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)); diff --git a/patches/e2fsprogs-1.46.5/series b/patches/e2fsprogs-1.46.5/series new file mode 100644 index 000000000..d4319d8ac --- /dev/null +++ b/patches/e2fsprogs-1.46.5/series @@ -0,0 +1,4 @@ +# generated by git-ptx-patches +#tag:base --start-number 1 +0001-libext2fs-add-sanity-check-to-extent-manipulation.patch +# 77d6a61d2930f9f66b3b54043619c609 - git-ptx-patches magic -- 2.34.1
