| 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-2024-26901: do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak |
| |
| syzbot identified a kernel information leak vulnerability in |
| do_sys_name_to_handle() and issued the following report [1]. |
| |
| [1] |
| "BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] |
| BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40 |
| instrument_copy_to_user include/linux/instrumented.h:114 [inline] |
| _copy_to_user+0xbc/0x100 lib/usercopy.c:40 |
| copy_to_user include/linux/uaccess.h:191 [inline] |
| do_sys_name_to_handle fs/fhandle.c:73 [inline] |
| __do_sys_name_to_handle_at fs/fhandle.c:112 [inline] |
| __se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94 |
| __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94 |
| ... |
| |
| Uninit was created at: |
| slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768 |
| slab_alloc_node mm/slub.c:3478 [inline] |
| __kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517 |
| __do_kmalloc_node mm/slab_common.c:1006 [inline] |
| __kmalloc+0x121/0x3c0 mm/slab_common.c:1020 |
| kmalloc include/linux/slab.h:604 [inline] |
| do_sys_name_to_handle fs/fhandle.c:39 [inline] |
| __do_sys_name_to_handle_at fs/fhandle.c:112 [inline] |
| __se_sys_name_to_handle_at+0x441/0xb10 fs/fhandle.c:94 |
| __x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94 |
| ... |
| |
| Bytes 18-19 of 20 are uninitialized |
| Memory access of size 20 starts at ffff888128a46380 |
| Data copied to user address 0000000020000240" |
| |
| Per Chuck Lever's suggestion, use kzalloc() instead of kmalloc() to |
| solve the problem. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26901 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 4.19.311 with commit 4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1 |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 5.4.273 with commit 772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 5.10.214 with commit cde76b3af247f615447bcfecf610bb76c3529126 |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 5.15.153 with commit 423b6bdf19bbc5e1f7e7461045099917378f7e71 |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 6.1.83 with commit e6450d5e46a737a008b4885aa223486113bf0ad6 |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 6.6.23 with commit c1362eae861db28b1608b9dc23e49634fe87b63b |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 6.7.11 with commit cba138f1ef37ec6f961baeab62f312dedc7cf730 |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 6.8.2 with commit bf9ec1b24ab4e94345aa1c60811dd329f069c38b |
| Issue introduced in 2.6.39 with commit 990d6c2d7aee921e3bce22b2d6a750fd552262be and fixed in 6.9 with commit 3948abaa4e2be938ccdfc289385a27342fb13d43 |
| |
| 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-2024-26901 |
| 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/fhandle.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/4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1 |
| https://git.kernel.org/stable/c/772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b |
| https://git.kernel.org/stable/c/cde76b3af247f615447bcfecf610bb76c3529126 |
| https://git.kernel.org/stable/c/423b6bdf19bbc5e1f7e7461045099917378f7e71 |
| https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6 |
| https://git.kernel.org/stable/c/c1362eae861db28b1608b9dc23e49634fe87b63b |
| https://git.kernel.org/stable/c/cba138f1ef37ec6f961baeab62f312dedc7cf730 |
| https://git.kernel.org/stable/c/bf9ec1b24ab4e94345aa1c60811dd329f069c38b |
| https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43 |
