From 68c66807db77453926fbfbedae3bee348c2c876c Mon Sep 17 00:00:00 2001 From: "Justin M. Forbes" Date: Fri, 4 May 2018 11:52:36 -0500 Subject: Fix CVE-2018-10322 CVE-2018-10323 --- 0001-xfs-enhance-dinode-verifier.patch | 72 ++++++++++++++++++++++ ...mat-back-to-extents-if-xfs_bmap_extents_t.patch | 45 ++++++++++++++ kernel.spec | 10 +++ 3 files changed, 127 insertions(+) create mode 100644 0001-xfs-enhance-dinode-verifier.patch create mode 100644 0001-xfs-set-format-back-to-extents-if-xfs_bmap_extents_t.patch diff --git a/0001-xfs-enhance-dinode-verifier.patch b/0001-xfs-enhance-dinode-verifier.patch new file mode 100644 index 000000000..230e79387 --- /dev/null +++ b/0001-xfs-enhance-dinode-verifier.patch @@ -0,0 +1,72 @@ +From b42db0860e13067fcc7cbfba3966c9e652668bbc Mon Sep 17 00:00:00 2001 +From: Eric Sandeen +Date: Mon, 16 Apr 2018 23:06:53 -0700 +Subject: [PATCH] xfs: enhance dinode verifier + +Add several more validations to xfs_dinode_verify: + +- For LOCAL data fork formats, di_nextents must be 0. +- For LOCAL attr fork formats, di_anextents must be 0. +- For inodes with no attr fork offset, + - format must be XFS_DINODE_FMT_EXTENTS if set at all + - di_anextents must be 0. + +Thanks to dchinner for pointing out a couple related checks I had +forgotten to add. + +Signed-off-by: Eric Sandeen +Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199377 +Reviewed-by: Darrick J. Wong +Signed-off-by: Darrick J. Wong +--- + fs/xfs/libxfs/xfs_inode_buf.c | 21 +++++++++++++++++++++ + 1 file changed, 21 insertions(+) + +diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c +index ef68b1de006a..1201107eabc6 100644 +--- a/fs/xfs/libxfs/xfs_inode_buf.c ++++ b/fs/xfs/libxfs/xfs_inode_buf.c +@@ -466,6 +466,8 @@ xfs_dinode_verify( + return __this_address; + if (di_size > XFS_DFORK_DSIZE(dip, mp)) + return __this_address; ++ if (dip->di_nextents) ++ return __this_address; + /* fall through */ + case XFS_DINODE_FMT_EXTENTS: + case XFS_DINODE_FMT_BTREE: +@@ -484,12 +486,31 @@ xfs_dinode_verify( + if (XFS_DFORK_Q(dip)) { + switch (dip->di_aformat) { + case XFS_DINODE_FMT_LOCAL: ++ if (dip->di_anextents) ++ return __this_address; ++ /* fall through */ + case XFS_DINODE_FMT_EXTENTS: + case XFS_DINODE_FMT_BTREE: + break; + default: + return __this_address; + } ++ } else { ++ /* ++ * If there is no fork offset, this may be a freshly-made inode ++ * in a new disk cluster, in which case di_aformat is zeroed. ++ * Otherwise, such an inode must be in EXTENTS format; this goes ++ * for freed inodes as well. ++ */ ++ switch (dip->di_aformat) { ++ case 0: ++ case XFS_DINODE_FMT_EXTENTS: ++ break; ++ default: ++ return __this_address; ++ } ++ if (dip->di_anextents) ++ return __this_address; + } + + /* only version 3 or greater inodes are extensively verified here */ +-- +2.17.0 + diff --git a/0001-xfs-set-format-back-to-extents-if-xfs_bmap_extents_t.patch b/0001-xfs-set-format-back-to-extents-if-xfs_bmap_extents_t.patch new file mode 100644 index 000000000..9c6814c65 --- /dev/null +++ b/0001-xfs-set-format-back-to-extents-if-xfs_bmap_extents_t.patch @@ -0,0 +1,45 @@ +From 2c4306f719b083d17df2963bc761777576b8ad1b Mon Sep 17 00:00:00 2001 +From: Eric Sandeen +Date: Mon, 16 Apr 2018 23:07:27 -0700 +Subject: [PATCH] xfs: set format back to extents if xfs_bmap_extents_to_btree + +If xfs_bmap_extents_to_btree fails in a mode where we call +xfs_iroot_realloc(-1) to de-allocate the root, set the +format back to extents. + +Otherwise we can assume we can dereference ifp->if_broot +based on the XFS_DINODE_FMT_BTREE format, and crash. + +Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199423 +Signed-off-by: Eric Sandeen +Reviewed-by: Christoph Hellwig +Reviewed-by: Darrick J. Wong +Signed-off-by: Darrick J. Wong +--- + fs/xfs/libxfs/xfs_bmap.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c +index 6a7c2f03ea11..040eeda8426f 100644 +--- a/fs/xfs/libxfs/xfs_bmap.c ++++ b/fs/xfs/libxfs/xfs_bmap.c +@@ -725,12 +725,16 @@ xfs_bmap_extents_to_btree( + *logflagsp = 0; + if ((error = xfs_alloc_vextent(&args))) { + xfs_iroot_realloc(ip, -1, whichfork); ++ ASSERT(ifp->if_broot == NULL); ++ XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS); + xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); + return error; + } + + if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) { + xfs_iroot_realloc(ip, -1, whichfork); ++ ASSERT(ifp->if_broot == NULL); ++ XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS); + xfs_btree_del_cursor(cur, XFS_BTREE_ERROR); + return -ENOSPC; + } +-- +2.17.0 + diff --git a/kernel.spec b/kernel.spec index c21cc1c53..af6dbc139 100644 --- a/kernel.spec +++ b/kernel.spec @@ -660,6 +660,12 @@ Patch508: Bluetooth-btusb-autosuspend-XPS-13-9360-fixes.patch # rhbz 1572944 Patch509: Revert-the-random-series-for-4.16.4.patch +# CVE-2018-10322 rhbz 1571623 1571624 +Patch510: 0001-xfs-enhance-dinode-verifier.patch + +# CVE-2018-10323 rhbz 1571627 1571630 +Patch511: 0001-xfs-set-format-back-to-extents-if-xfs_bmap_extents_t.patch + # END OF PATCH DEFINITIONS %endif @@ -1912,6 +1918,10 @@ fi # # %changelog +* Fri May 04 2018 Justin M. Forbes +- Fix CVE-2018-10322 (rhbz 1571623 1571624) +- Fix CVE-2018-10323 (rhbz 1571627 1571630) + * Wed May 02 2018 Jeremy Cline - 4.16.7-200 - Linux v4.16.7 -- cgit