| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49062: cachefiles: Fix KASAN slab-out-of-bounds in cachefiles_set_volume_xattr |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| cachefiles: Fix KASAN slab-out-of-bounds in cachefiles_set_volume_xattr |
| |
| Use the actual length of volume coherency data when setting the |
| xattr to avoid the following KASAN report. |
| |
| BUG: KASAN: slab-out-of-bounds in cachefiles_set_volume_xattr+0xa0/0x350 [cachefiles] |
| Write of size 4 at addr ffff888101e02af4 by task kworker/6:0/1347 |
| |
| CPU: 6 PID: 1347 Comm: kworker/6:0 Kdump: loaded Not tainted 5.18.0-rc1-nfs-fscache-netfs+ #13 |
| Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-4.fc34 04/01/2014 |
| Workqueue: events fscache_create_volume_work [fscache] |
| Call Trace: |
| <TASK> |
| dump_stack_lvl+0x45/0x5a |
| print_report.cold+0x5e/0x5db |
| ? __lock_text_start+0x8/0x8 |
| ? cachefiles_set_volume_xattr+0xa0/0x350 [cachefiles] |
| kasan_report+0xab/0x120 |
| ? cachefiles_set_volume_xattr+0xa0/0x350 [cachefiles] |
| kasan_check_range+0xf5/0x1d0 |
| memcpy+0x39/0x60 |
| cachefiles_set_volume_xattr+0xa0/0x350 [cachefiles] |
| cachefiles_acquire_volume+0x2be/0x500 [cachefiles] |
| ? __cachefiles_free_volume+0x90/0x90 [cachefiles] |
| fscache_create_volume_work+0x68/0x160 [fscache] |
| process_one_work+0x3b7/0x6a0 |
| worker_thread+0x2c4/0x650 |
| ? process_one_work+0x6a0/0x6a0 |
| kthread+0x16c/0x1a0 |
| ? kthread_complete_and_exit+0x20/0x20 |
| ret_from_fork+0x22/0x30 |
| </TASK> |
| |
| Allocated by task 1347: |
| kasan_save_stack+0x1e/0x40 |
| __kasan_kmalloc+0x81/0xa0 |
| cachefiles_set_volume_xattr+0x76/0x350 [cachefiles] |
| cachefiles_acquire_volume+0x2be/0x500 [cachefiles] |
| fscache_create_volume_work+0x68/0x160 [fscache] |
| process_one_work+0x3b7/0x6a0 |
| worker_thread+0x2c4/0x650 |
| kthread+0x16c/0x1a0 |
| ret_from_fork+0x22/0x30 |
| |
| The buggy address belongs to the object at ffff888101e02af0 |
| which belongs to the cache kmalloc-8 of size 8 |
| The buggy address is located 4 bytes inside of |
| 8-byte region [ffff888101e02af0, ffff888101e02af8) |
| |
| The buggy address belongs to the physical page: |
| page:00000000a2292d70 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101e02 |
| flags: 0x17ffffc0000200(slab|node=0|zone=2|lastcpupid=0x1fffff) |
| raw: 0017ffffc0000200 0000000000000000 dead000000000001 ffff888100042280 |
| raw: 0000000000000000 0000000080660066 00000001ffffffff 0000000000000000 |
| page dumped because: kasan: bad access detected |
| |
| Memory state around the buggy address: |
| ffff888101e02980: fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc |
| ffff888101e02a00: 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00 |
| >ffff888101e02a80: fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 04 fc |
| ^ |
| ffff888101e02b00: fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc |
| ffff888101e02b80: fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc |
| ================================================================== |
| |
| The Linux kernel CVE team has assigned CVE-2022-49062 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.17 with commit 413a4a6b0b5553f2423d210f65e98c211b99c3f8 and fixed in 5.17.4 with commit 09a5df1b88c8f126c8ff9938edf160edd4e92f42 |
| Issue introduced in 5.17 with commit 413a4a6b0b5553f2423d210f65e98c211b99c3f8 and fixed in 5.18 with commit 7b2f6c306601240635c72caa61f682e74d4591b2 |
| |
| 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-2022-49062 |
| 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: |
| fs/cachefiles/xattr.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/09a5df1b88c8f126c8ff9938edf160edd4e92f42 |
| https://git.kernel.org/stable/c/7b2f6c306601240635c72caa61f682e74d4591b2 |
