| 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-2024-42300: erofs: fix race in z_erofs_get_gbuf() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| erofs: fix race in z_erofs_get_gbuf() |
| |
| In z_erofs_get_gbuf(), the current task may be migrated to another |
| CPU between `z_erofs_gbuf_id()` and `spin_lock(&gbuf->lock)`. |
| |
| Therefore, z_erofs_put_gbuf() will trigger the following issue |
| which was found by stress test: |
| |
| <2>[772156.434168] kernel BUG at fs/erofs/zutil.c:58! |
| .. |
| <4>[772156.435007] |
| <4>[772156.439237] CPU: 0 PID: 3078 Comm: stress Kdump: loaded Tainted: G E 6.10.0-rc7+ #2 |
| <4>[772156.439239] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 1.0.0 01/01/2017 |
| <4>[772156.439241] pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) |
| <4>[772156.439243] pc : z_erofs_put_gbuf+0x64/0x70 [erofs] |
| <4>[772156.439252] lr : z_erofs_lz4_decompress+0x600/0x6a0 [erofs] |
| .. |
| <6>[772156.445958] stress (3127): drop_caches: 1 |
| <4>[772156.446120] Call trace: |
| <4>[772156.446121] z_erofs_put_gbuf+0x64/0x70 [erofs] |
| <4>[772156.446761] z_erofs_lz4_decompress+0x600/0x6a0 [erofs] |
| <4>[772156.446897] z_erofs_decompress_queue+0x740/0xa10 [erofs] |
| <4>[772156.447036] z_erofs_runqueue+0x428/0x8c0 [erofs] |
| <4>[772156.447160] z_erofs_readahead+0x224/0x390 [erofs] |
| .. |
| |
| The Linux kernel CVE team has assigned CVE-2024-42300 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.10 with commit f36f3010f67611a45d66e773bc91e4c66a9abab5 and fixed in 6.10.3 with commit 49b22e06a947727a6d1c802d2d9ad92420b90fc5 |
| Issue introduced in 6.10 with commit f36f3010f67611a45d66e773bc91e4c66a9abab5 and fixed in 6.11 with commit 7dc5537c3f8be87e005f0844a7626c987914f8fd |
| |
| 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-2024-42300 |
| 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/erofs/zutil.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/49b22e06a947727a6d1c802d2d9ad92420b90fc5 |
| https://git.kernel.org/stable/c/7dc5537c3f8be87e005f0844a7626c987914f8fd |
