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From cec4ee812b7c642c552c64c488a299323d622638 Mon Sep 17 00:00:00 2001
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From: Joe Lawrence <joe.lawrence@redhat.com>
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Date: Fri, 7 Jan 2022 14:11:20 -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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4.18.0-348.el8
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4.18.0-348.2.1.el8_5
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4.18.0-348.7.1.el8_5
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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-8/-/merge_requests/12
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Approved-by: Artem Savkov (@artem.savkov)
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Kernels:
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4.18.0-348.el8
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4.18.0-348.2.1.el8_5
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4.18.0-348.7.1.el8_5
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Modifications: none
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Z-MR: https://gitlab.com/redhat/prdsc/rhel/src/kernel-private/rhel-8/-/merge_requests/28
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KT0 test PASS: https://beaker.engineering.redhat.com/jobs/6173055
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for kpatch-patch-4_18_0-348-1-2.el8 scratch build:
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https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=42267085
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commit 374251004418783ae2e1e191b957cf63e3796d5e
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Author: Bruno Meneguele <bmeneg@redhat.com>
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Date: Thu Jan 6 17:19:24 2022 -0300
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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/2034864
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CVE: CVE-2021-4155
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O-Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2034865
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O-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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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: Bruno Meneguele <bmeneg@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 2a68819e4fe5..7d9c76c5cfb0 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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@@ -686,7 +686,8 @@ xfs_ioc_space(
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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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