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From 84e2346b7ae9c50f95701027f8d860424623a294 Mon Sep 17 00:00:00 2001
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From: Joe Lawrence <joe.lawrence@redhat.com>
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Date: Fri, 14 Jan 2022 09:25:24 -0500
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Subject: [KPATCH CVE-2022-0185] vfs: kpatch fixes for CVE-2022-0185
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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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fs_context.o: changed function: legacy_parse_param
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---------------------------
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Kpatch-MR: https://gitlab.com/redhat/prdsc/rhel/src/kpatch/rhel-8/-/merge_requests/15
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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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commit 689263a917cde581464bdc69777dd0f3d9e808af
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Author: Frantisek Hrbata <fhrbata@redhat.com>
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Date: Fri Jan 14 10:30:05 2022 +0100
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vfs: Out-of-bounds write of heap buffer in fs_context.c
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Bugzilla: https://bugzilla.redhat.com/2040585
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CVE: CVE-2022-0185
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From Jamie Hill-Daniel <jamie@hill-daniel.co.uk>
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The "PAGE_SIZE - 2 - size" calculation is is an unsigned type so
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a large value of "size" results in a high positive value. This
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results in heap overflow which can be exploited by a standard
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user for privilege escalation.
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Signed-off-by: Frantisek Hrbata <fhrbata@redhat.com>
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Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
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---
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fs/fs_context.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/fs/fs_context.c b/fs/fs_context.c
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index b1eacb03b72f..c921102b2398 100644
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--- a/fs/fs_context.c
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+++ b/fs/fs_context.c
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@@ -563,8 +563,10 @@ static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)
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return invalf(fc, "VFS: Legacy: Parameter type for '%s' not supported",
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param->key);
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}
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-
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- if (len > PAGE_SIZE - 2 - size)
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+ /* Subtracting 'size' from PAGE_SIZE can lead to integer underflow,
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+ * so check bounds using addition instead.
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+ */
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+ if (size + len + 2 > PAGE_SIZE)
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return invalf(fc, "VFS: Legacy: Cumulative options too large");
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if (strchr(param->key, ',') ||
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(param->type == fs_value_is_string &&
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--
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2.26.3
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