Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: exec: do_close_on_exec() before taking exec_update_lock do_close_on_exec() currently happens while holding the exec_update_lock, which is used in a lot of places that access process state to synchronize access checks. I recently added another such use of exec_update_lock, causing a regression. do_close_on_exec() can block waiting for a reply from a filesystem. That means a hung filesystem can block codepaths that use exec_update_lock; and it also means that a FUSE filesystem which attempts to inspect the calling process can deadlock. To avoid such problems, move do_close_on_exec() before the exec_update_lock is taken, but after the FD table has been copied if necessary. I have looked through all the calls between the old and new position of the do_close_on_exec() call; there seems to be no file descriptor table access in between.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected ae1e630bcaac739f625822078edbaea98366930d before 955973fff4a36d39a848b00cac1706863f568fe1; affected d54f14655fd7d7b293698a8b6918563c4c0465e7 before 550feab5b01000ab314868b62211fb3ddfd600e8; affected bb43679356f1f2a4c6b1c88aec4f021e5b5c74e9 before 5aacc19ba2b1faf84c4a2f2cf9a1784e03d1ff38; affected 7456ae990a9738962b33146916fabca62ae3d4e0 before 3feb4020bfb7ccf0d347f27051639d25e19cd65d; affected 4bfe8c481846cee52473a2f7d7b30ee8e6749fc4 before 0d86cd6b709c39216e6ee5ea8f0fc4242bbb2b53; affected f9b4b03ccc9c69bf7f7298d4559906ebea7143b3 before 19ddef61ee0a49782a60f8f497e50597ad5de2da; affected 6650527444dadc63d84aa939d14ecba4fadb2f69 before 63be3d8511bdafa095cd14a393cbf3c58dbbb928; affected 6650527444dadc63d84aa939d14ecba4fadb2f69 before e780259b54e618ceb4763fbc21314acf3565e813; affected c1cfd63326f5d09999134e9052c353faf738286e; affected 5.10.261 before 5.10.271; affected 5.15.212 before 5.15.222; affected 6.1.178 before 6.1.189; affected 6.6.145 before 6.6.158; affected 6.12.97 before 6.12.111; affected 6.18.40 before 6.18.53; affected 7.1.4 before 7.2 |
| Linux / Linux | affected 7.2; unaffected 0 before 7.2; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/955973fff4a36d39a848b00cac1706863f568fe1
- https://git.kernel.org/stable/c/550feab5b01000ab314868b62211fb3ddfd600e8
- https://git.kernel.org/stable/c/5aacc19ba2b1faf84c4a2f2cf9a1784e03d1ff38
- https://git.kernel.org/stable/c/3feb4020bfb7ccf0d347f27051639d25e19cd65d
- https://git.kernel.org/stable/c/0d86cd6b709c39216e6ee5ea8f0fc4242bbb2b53
- https://git.kernel.org/stable/c/19ddef61ee0a49782a60f8f497e50597ad5de2da
- https://git.kernel.org/stable/c/63be3d8511bdafa095cd14a393cbf3c58dbbb928
- https://git.kernel.org/stable/c/e780259b54e618ceb4763fbc21314acf3565e813