Description
In the Linux kernel, the following vulnerability has been resolved: md: avoid repeated calls to del_gendisk There is a uaf problem which is found by case 23rdev-lifetime: Oops: general protection fault, probably for non-canonical address 0xdead000000000122 RIP: 0010:bdi_unregister+0x4b/0x170 Call Trace: <TASK> __del_gendisk+0x356/0x3e0 mddev_unlock+0x351/0x360 rdev_attr_store+0x217/0x280 kernfs_fop_write_iter+0x14a/0x210 vfs_write+0x29e/0x550 ksys_write+0x74/0xf0 do_syscall_64+0xbb/0x380 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff5250a177e The sequence is: 1. rdev remove path gets reconfig_mutex 2. rdev remove path release reconfig_mutex in mddev_unlock 3. md stop calls do_md_stop and sets MD_DELETED 4. rdev remove path calls del_gendisk because MD_DELETED is set 5. md stop path release reconfig_mutex and calls del_gendisk again So there is a race condition we should resolve. This patch adds a flag MD_DO_DELETE to avoid the race condition.
Product status
9e59d609763f70a992a8f3808dabcce60f14eb5c (git) before b4c5cf406062ad44cd178269571530c6435b2f3b
9e59d609763f70a992a8f3808dabcce60f14eb5c (git) before f0fae1debeb9102398ddf2ef69b4f5d395afafed
9e59d609763f70a992a8f3808dabcce60f14eb5c (git) before 90e3bb44c0a86e245d8e5c6520206fa113acb1ee
6.17
Any version before 6.17
6.17.13 (semver)
6.18.2 (semver)
6.19-rc1 (original_commit_for_fix)
References
git.kernel.org/...c/b4c5cf406062ad44cd178269571530c6435b2f3b
git.kernel.org/...c/f0fae1debeb9102398ddf2ef69b4f5d395afafed
git.kernel.org/...c/90e3bb44c0a86e245d8e5c6520206fa113acb1ee
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