From 60e335b76ea0aeedd9f8e01d247f9aaa617076da Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Tue, 6 Dec 2022 00:17:35 +0100 Subject: [PATCH] e2fsprogs: Fix CVE-2022-1304 This fixes CVE-2022-1304: An out-of-bounds read/write vulnerability was found in e2fsprogs 1.46.5. This issue leads to a segmentation fault and possibly arbitrary code execution via a specially crafted filesystem. Signed-off-by: Hauke Mehrtens --- package/utils/e2fsprogs/Makefile | 2 +- ...-sanity-check-to-extent-manipulation.patch | 50 +++++++++++++++++++ tools/e2fsprogs/Makefile | 2 +- ...-sanity-check-to-extent-manipulation.patch | 50 +++++++++++++++++++ 4 files changed, 102 insertions(+), 2 deletions(-) create mode 100644 package/utils/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch create mode 100644 tools/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch diff --git a/package/utils/e2fsprogs/Makefile b/package/utils/e2fsprogs/Makefile index b131cdccac..2ece58f315 100644 --- a/package/utils/e2fsprogs/Makefile +++ b/package/utils/e2fsprogs/Makefile @@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk PKG_NAME:=e2fsprogs PKG_VERSION:=1.46.5 -PKG_RELEASE:=1 +PKG_RELEASE:=2 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz PKG_SOURCE_URL:=@KERNEL/linux/kernel/people/tytso/e2fsprogs/v$(PKG_VERSION)/ diff --git a/package/utils/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch b/package/utils/e2fsprogs/patches/004-CVE-2022-1304-libext2fs-add-sanity-check-to-extent-manipulation.patch new file mode 100644 index 0000000000..e5a76161f2 --- /dev/null +++ b/package/utils/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 +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 +Reported-by: Nils Bars +Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2068113 +Addresses: CVE-2022-1304 +Addresses-Debian-Bug: #1010263 +Signed-off-by: Theodore Ts'o +--- + 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)); diff --git a/tools/e2fsprogs/Makefile b/tools/e2fsprogs/Makefile index 004a04ea26..a8bd745afb 100644 --- a/tools/e2fsprogs/Makefile +++ b/tools/e2fsprogs/Makefile @@ -11,7 +11,7 @@ PKG_NAME:=e2fsprogs PKG_CPE_ID:=cpe:/a:e2fsprogs_project:e2fsprogs PKG_VERSION:=1.46.5 PKG_HASH:=2f16c9176704cf645dc69d5b15ff704ae722d665df38b2ed3cfc249757d8d81e -PKG_RELEASE:=1 +PKG_RELEASE:=2 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz PKG_SOURCE_URL:=@KERNEL/linux/kernel/people/tytso/e2fsprogs/v$(PKG_VERSION)/ 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 +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 +Reported-by: Nils Bars +Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2068113 +Addresses: CVE-2022-1304 +Addresses-Debian-Bug: #1010263 +Signed-off-by: Theodore Ts'o +--- + 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)); -- 2.30.2