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From 01df9f93baafe0243264cf24f42d84e124c9ee0a Mon Sep 17 00:00:00 2001
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From: Joe Lawrence <joe.lawrence@redhat.com>
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Date: Tue, 4 Jan 2022 13:53:44 -0500
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Subject: [KPATCH CVE-2021-4155] xfs: kpatch fixes for CVE-2021-4155
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Kernels:
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3.10.0-1160.15.2.el7
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3.10.0-1160.21.1.el7
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3.10.0-1160.24.1.el7
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3.10.0-1160.25.1.el7
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3.10.0-1160.31.1.el7
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3.10.0-1160.36.2.el7
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3.10.0-1160.41.1.el7
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3.10.0-1160.42.2.el7
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3.10.0-1160.45.1.el7
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3.10.0-1160.49.1.el7
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3.10.0-1160.53.1.el7
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Changes since last build:
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arches: x86_64 ppc64le
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xfs_ioctl.o: changed function: xfs_ioc_space
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---------------------------
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Kpatch-MR: https://gitlab.com/redhat/prdsc/rhel/src/kpatch/rhel-7/-/merge_requests/15
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Approved-by: Yannick Cote (@ycote1)
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Approved-by: Artem Savkov (@artem.savkov)
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Kernels:
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3.10.0-1160.21.1.el7
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3.10.0-1160.24.1.el7
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3.10.0-1160.25.1.el7
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3.10.0-1160.31.1.el7
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3.10.0-1160.36.2.el7
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3.10.0-1160.41.1.el7
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3.10.0-1160.42.2.el7
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3.10.0-1160.45.1.el7
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3.10.0-1160.49.1.el7
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3.10.0-1160.53.1.el7
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Modifications: none
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Z-MR: https://gitlab.com/redhat/prdsc/rhel/src/kernel-private/rhel-7/-/merge_requests/18
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KT0 test PASS: https://beaker.engineering.redhat.com/jobs/6164756
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for kpatch-patch-3_10_0-1160_15_2-1-11.el7 scratch build:
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https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=42181339
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commit 65cb42abca9a5a600cbbdbbef8ddbafd028b7b5d
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Author: Carlos Maiolino <cmaiolino@redhat.com>
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Date: Tue Jan 4 08:29:12 2022 +0100
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xfs: map unwritten blocks in XFS_IOC_{ALLOC,FREE}SP just like fallocate
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2034857
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CVE: CVE-2021-4155
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Tested: xfstests and specific reproducer
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Upstream status: Posted privately due to embargo
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Conflicts:
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- el7 required small adjustment to the patch, to fit the old
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code.
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The old ALLOCSP/FREESP ioctls in XFS can be used to preallocate space at
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the end of files, just like fallocate and RESVSP. Make the behavior
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consistent with the other ioctls.
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Reported-by: Kirill Tkhai <ktkhai@virtuozzo.com>
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Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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Reviewed-by: Dave Chinner <dchinner@redhat.com>
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Reviewed-by: Eric Sandeen <sandeen@redhat.com>
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(cherry picked from commit 983d8e60f50806f90534cc5373d0ce867e5aaf79)
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Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
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Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
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---
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fs/xfs/xfs_ioctl.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
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index 722396680482..8f1c795c8765 100644
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--- a/fs/xfs/xfs_ioctl.c
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+++ b/fs/xfs/xfs_ioctl.c
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@@ -773,7 +773,8 @@ xfs_ioc_space(
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flags |= XFS_PREALLOC_CLEAR;
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if (bf->l_start > XFS_ISIZE(ip)) {
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error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
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- bf->l_start - XFS_ISIZE(ip), 0);
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+ bf->l_start - XFS_ISIZE(ip),
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+ XFS_BMAPI_PREALLOC);
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if (error)
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goto out_unlock;
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}
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--
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2.26.3
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