| 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-2024-35974: block: fix q->blkg_list corruption during disk rebind |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| block: fix q->blkg_list corruption during disk rebind |
| |
| Multiple gendisk instances can allocated/added for single request queue |
| in case of disk rebind. blkg may still stay in q->blkg_list when calling |
| blkcg_init_disk() for rebind, then q->blkg_list becomes corrupted. |
| |
| Fix the list corruption issue by: |
| |
| - add blkg_init_queue() to initialize q->blkg_list & q->blkcg_mutex only |
| - move calling blkg_init_queue() into blk_alloc_queue() |
| |
| The list corruption should be started since commit f1c006f1c685 ("blk-cgroup: |
| synchronize pd_free_fn() from blkg_free_workfn() and blkcg_deactivate_policy()") |
| which delays removing blkg from q->blkg_list into blkg_free_workfn(). |
| |
| The Linux kernel CVE team has assigned CVE-2024-35974 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.18 with commit 1059699f87eb0b3aa9d574b91a572d534897134a and fixed in 6.6.28 with commit 740ffad95ca8033bd6e080ed337655b13b4d38ac |
| Issue introduced in 5.18 with commit 1059699f87eb0b3aa9d574b91a572d534897134a and fixed in 6.8.7 with commit 858c489d81d659af17a4d11cfaad2afb42e47a76 |
| Issue introduced in 5.18 with commit 1059699f87eb0b3aa9d574b91a572d534897134a and fixed in 6.9 with commit 8b8ace080319a866f5dfe9da8e665ae51d971c54 |
| |
| 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-2024-35974 |
| 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: |
| block/blk-cgroup.c |
| block/blk-cgroup.h |
| block/blk-core.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/740ffad95ca8033bd6e080ed337655b13b4d38ac |
| https://git.kernel.org/stable/c/858c489d81d659af17a4d11cfaad2afb42e47a76 |
| https://git.kernel.org/stable/c/8b8ace080319a866f5dfe9da8e665ae51d971c54 |
