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.
Product status
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before 81f44ed8c3f54abb7561ece774ea4cca5070b2f2
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before f50e7c325ab1207fe941555bcff659f6d7050572
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before 9467d360be70e6ee55b0c1cd2a1f1424f57b5b85
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before 47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before add4982510f3b7c318a2dd7438bdc9c63171e753
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before 2d6965581e164fa2ba3f7652ddae5535f6336576
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before 4f71c8ba2dc009042493021d94a9718fbe2ebf27
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before 383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9
cafe563591446cf80bfbc2fe3bc72a2e36cf1060 (git) before fec114a98b8735ee89c75216c45a78e28be0f128
3.10
Any version before 3.10
5.10.258 (semver)
5.15.209 (semver)
6.1.175 (semver)
6.6.136 (semver)
6.12.83 (semver)
6.18.24 (semver)
6.19.14 (semver)
7.0.1 (semver)
7.1-rc1 (original_commit_for_fix)
References
git.kernel.org/...c/81f44ed8c3f54abb7561ece774ea4cca5070b2f2
git.kernel.org/...c/f50e7c325ab1207fe941555bcff659f6d7050572
git.kernel.org/...c/9467d360be70e6ee55b0c1cd2a1f1424f57b5b85
git.kernel.org/...c/47fa09fe7f3e09df28a51cb2cbd8f5d2f7f6edc1
git.kernel.org/...c/add4982510f3b7c318a2dd7438bdc9c63171e753
git.kernel.org/...c/2d6965581e164fa2ba3f7652ddae5535f6336576
git.kernel.org/...c/4f71c8ba2dc009042493021d94a9718fbe2ebf27
git.kernel.org/...c/383f7fec0de8cee1cf7ae1f9d9f14044a61f10f9
git.kernel.org/...c/fec114a98b8735ee89c75216c45a78e28be0f128