linux-cve-announce - CVE-2022-49261: drm/i915/gem: add missing boundary check in vm

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Message-ID: <2025022628-CVE-2022-49261-d253@gregkh>
Date: Wed, 26 Feb 2025 02:57:46 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49261: drm/i915/gem: add missing boundary check in vm_access

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

drm/i915/gem: add missing boundary check in vm_access

A missing bounds check in vm_access() can lead to an out-of-bounds read
or write in the adjacent memory area, since the len attribute is not
validated before the memcpy later in the function, potentially hitting:

[  183.637831] BUG: unable to handle page fault for address: ffffc90000c86000
[  183.637934] #PF: supervisor read access in kernel mode
[  183.637997] #PF: error_code(0x0000) - not-present page
[  183.638059] PGD 100000067 P4D 100000067 PUD 100258067 PMD 106341067 PTE 0
[  183.638144] Oops: 0000 [#2] PREEMPT SMP NOPTI
[  183.638201] CPU: 3 PID: 1790 Comm: poc Tainted: G      D           5.17.0-rc6-ci-drm-11296+ #1
[  183.638298] Hardware name: Intel Corporation CoffeeLake Client Platform/CoffeeLake H DDR4 RVP, BIOS CNLSFWR1.R00.X208.B00.1905301319 05/30/2019
[  183.638430] RIP: 0010:memcpy_erms+0x6/0x10
[  183.640213] RSP: 0018:ffffc90001763d48 EFLAGS: 00010246
[  183.641117] RAX: ffff888109c14000 RBX: ffff888111bece40 RCX: 0000000000000ffc
[  183.642029] RDX: 0000000000001000 RSI: ffffc90000c86000 RDI: ffff888109c14004
[  183.642946] RBP: 0000000000000ffc R08: 800000000000016b R09: 0000000000000000
[  183.643848] R10: ffffc90000c85000 R11: 0000000000000048 R12: 0000000000001000
[  183.644742] R13: ffff888111bed190 R14: ffff888109c14000 R15: 0000000000001000
[  183.645653] FS:  00007fe5ef807540(0000) GS:ffff88845b380000(0000) knlGS:0000000000000000
[  183.646570] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  183.647481] CR2: ffffc90000c86000 CR3: 000000010ff02006 CR4: 00000000003706e0
[  183.648384] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  183.649271] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  183.650142] Call Trace:
[  183.650988]  <TASK>
[  183.651793]  vm_access+0x1f0/0x2a0 [i915]
[  183.652726]  __access_remote_vm+0x224/0x380
[  183.653561]  mem_rw.isra.0+0xf9/0x190
[  183.654402]  vfs_read+0x9d/0x1b0
[  183.655238]  ksys_read+0x63/0xe0
[  183.656065]  do_syscall_64+0x38/0xc0
[  183.656882]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[  183.657663] RIP: 0033:0x7fe5ef725142
[  183.659351] RSP: 002b:00007ffe1e81c7e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[  183.660227] RAX: ffffffffffffffda RBX: 0000557055dfb780 RCX: 00007fe5ef725142
[  183.661104] RDX: 0000000000001000 RSI: 00007ffe1e81d880 RDI: 0000000000000005
[  183.661972] RBP: 00007ffe1e81e890 R08: 0000000000000030 R09: 0000000000000046
[  183.662832] R10: 0000557055dfc2e0 R11: 0000000000000246 R12: 0000557055dfb1c0
[  183.663691] R13: 00007ffe1e81e980 R14: 0000000000000000 R15: 0000000000000000

Changes since v1:
     - Updated if condition with range_overflows_t [Chris Wilson]

[mauld: tidy up the commit message and add Cc: stable]
(cherry picked from commit 661412e301e2ca86799aa4f400d1cf0bd38c57c6)

The Linux kernel CVE team has assigned CVE-2022-49261 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 5.8 with commit 9f909e215fea0652023b9ed09d3d7bfe10386423 and fixed in 5.10.110 with commit 89ddcc81914ab58cc203acc844f27d55ada8ec0e
	Issue introduced in 5.8 with commit 9f909e215fea0652023b9ed09d3d7bfe10386423 and fixed in 5.15.33 with commit 312d3d4f49e12f97260bcf972c848c3562126a18
	Issue introduced in 5.8 with commit 9f909e215fea0652023b9ed09d3d7bfe10386423 and fixed in 5.16.19 with commit 5f6e560e3e86ac053447524224e411034f41f5c7
	Issue introduced in 5.8 with commit 9f909e215fea0652023b9ed09d3d7bfe10386423 and fixed in 5.17.2 with commit 8f0ebea8f6e8c474264ed97d7a64c9c09ed4f5aa
	Issue introduced in 5.8 with commit 9f909e215fea0652023b9ed09d3d7bfe10386423 and fixed in 5.18 with commit 3886a86e7e6cc6ce2ce93c440fecd8f42aed0ce7

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-49261
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/gpu/drm/i915/gem/i915_gem_mman.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/89ddcc81914ab58cc203acc844f27d55ada8ec0e
	https://git.kernel.org/stable/c/312d3d4f49e12f97260bcf972c848c3562126a18
	https://git.kernel.org/stable/c/5f6e560e3e86ac053447524224e411034f41f5c7
	https://git.kernel.org/stable/c/8f0ebea8f6e8c474264ed97d7a64c9c09ed4f5aa
	https://git.kernel.org/stable/c/3886a86e7e6cc6ce2ce93c440fecd8f42aed0ce7