| 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-2024-53049: slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache_noprof |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache_noprof |
| |
| 'modprobe slub_kunit' will have a warning as shown below. The root cause |
| is that __kmalloc_cache_noprof was directly used, which resulted in no |
| alloc_tag being allocated. This caused current->alloc_tag to be null, |
| leading to a warning in alloc_tag_add_check. |
| |
| Let's add an alloc_hook layer to __kmalloc_cache_noprof specifically |
| within lib/slub_kunit.c, which is the only user of this internal slub |
| function outside kmalloc implementation itself. |
| |
| [58162.947016] WARNING: CPU: 2 PID: 6210 at |
| ./include/linux/alloc_tag.h:125 alloc_tagging_slab_alloc_hook+0x268/0x27c |
| [58162.957721] Call trace: |
| [58162.957919] alloc_tagging_slab_alloc_hook+0x268/0x27c |
| [58162.958286] __kmalloc_cache_noprof+0x14c/0x344 |
| [58162.958615] test_kmalloc_redzone_access+0x50/0x10c [slub_kunit] |
| [58162.959045] kunit_try_run_case+0x74/0x184 [kunit] |
| [58162.959401] kunit_generic_run_threadfn_adapter+0x2c/0x4c [kunit] |
| [58162.959841] kthread+0x10c/0x118 |
| [58162.960093] ret_from_fork+0x10/0x20 |
| [58162.960363] ---[ end trace 0000000000000000 ]--- |
| |
| The Linux kernel CVE team has assigned CVE-2024-53049 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit a0a44d9175b349df2462089140fb7f292100bd7c and fixed in 6.11.7 with commit 79aea7dfd98fbbf282d1408fc21849fc9a677768 |
| Issue introduced in 6.11 with commit a0a44d9175b349df2462089140fb7f292100bd7c and fixed in 6.12 with commit 2b059d0d1e624adc6e69a754bc48057f8bf459dc |
| |
| 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-2024-53049 |
| 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: |
| lib/slub_kunit.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/79aea7dfd98fbbf282d1408fc21849fc9a677768 |
| https://git.kernel.org/stable/c/2b059d0d1e624adc6e69a754bc48057f8bf459dc |
