Description
In the Linux kernel, the following vulnerability has been resolved: bcache: fix cached_dev.sb_bio use-after-free and crash In our production environment, we have received multiple crash reports regarding libceph, which have caught our attention: ``` [6888366.280350] Call Trace: [6888366.280452] blk_update_request+0x14e/0x370 [6888366.280561] blk_mq_end_request+0x1a/0x130 [6888366.280671] rbd_img_handle_request+0x1a0/0x1b0 [rbd] [6888366.280792] rbd_obj_handle_request+0x32/0x40 [rbd] [6888366.280903] __complete_request+0x22/0x70 [libceph] [6888366.281032] osd_dispatch+0x15e/0xb40 [libceph] [6888366.281164] ? inet_recvmsg+0x5b/0xd0 [6888366.281272] ? ceph_tcp_recvmsg+0x6f/0xa0 [libceph] [6888366.281405] ceph_con_process_message+0x79/0x140 [libceph] [6888366.281534] ceph_con_v1_try_read+0x5d7/0xf30 [libceph] [6888366.281661] ceph_con_workfn+0x329/0x680 [libceph] ``` After analyzing the coredump file, we found that the address of dc->sb_bio has been freed. We know that cached_dev is only freed when it is stopped. Since sb_bio is a part of struct cached_dev, rather than an alloc every time. If the device is stopped while writing to the superblock, the released address will be accessed at endio. This patch hopes to wait for sb_write to complete in cached_dev_free. It should be noted that we analyzed the cause of the problem, then tell all details to the QWEN and adopted the modifications it made.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 81f44ed8c3f54abb7561ece774ea4cca5070b2f2affectedcafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < f50e7c325ab1207fe941555bcff659f6d7050572affectedcafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 9467d360be70e6ee55b0c1cd2a1f1424f57b5b85affectedcafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1affectedcafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < add4982510f3b7c318a2dd7438bdc9c63171e753affectedcafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 2d6965581e164fa2ba3f7652ddae5535f6336576affectedcafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 4f71c8ba2dc009042493021d94a9718fbe2ebf27affectedcafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < 383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9affectedcafe563591446cf80bfbc2fe3bc72a2e36cf1060 to < fec114a98b8735ee89c75216c45a78e28be0f128affected
Linux Linux
Default version status: affected
3.10affected0 to < 3.10unaffected5.10.258 to ≤ 5.10.*unaffected5.15.209 to ≤ 5.15.*unaffected6.1.175 to ≤ 6.1.*unaffected6.6.136 to ≤ 6.6.*unaffected6.12.83 to ≤ 6.12.*unaffected6.18.24 to ≤ 6.18.*unaffected6.19.14 to ≤ 6.19.*unaffected7.0.1 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2 ↗
- https://git.kernel.org/stable/c/f50e7c325ab1207fe941555bcff659f6d7050572 ↗
- https://git.kernel.org/stable/c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85 ↗
- https://git.kernel.org/stable/c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1 ↗
- https://git.kernel.org/stable/c/add4982510f3b7c318a2dd7438bdc9c63171e753 ↗
- https://git.kernel.org/stable/c/2d6965581e164fa2ba3f7652ddae5535f6336576 ↗
- https://git.kernel.org/stable/c/4f71c8ba2dc009042493021d94a9718fbe2ebf27 ↗
- https://git.kernel.org/stable/c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9 ↗
- https://git.kernel.org/stable/c/fec114a98b8735ee89c75216c45a78e28be0f128 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗