Description
In the Linux kernel, the following vulnerability has been resolved: nbd: Fix hung when signal interrupts nbd_start_device_ioctl() syzbot reported hung task [1]. The following program is a simplified version of the reproducer: int main(void) { int sv[2], fd; if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv) < 0) return 1; if ((fd = open("/dev/nbd0", 0)) < 0) return 1; if (ioctl(fd, NBD_SET_SIZE_BLOCKS, 0x81) < 0) return 1; if (ioctl(fd, NBD_SET_SOCK, sv[0]) < 0) return 1; if (ioctl(fd, NBD_DO_IT) < 0) return 1; return 0; } When signal interrupt nbd_start_device_ioctl() waiting the condition atomic_read(&config->recv_threads) == 0, the task can hung because it waits the completion of the inflight IOs. This patch fixes the issue by clearing queue, not just shutdown, when signal interrupt nbd_start_device_ioctl().
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
5ea8d10802ec4c153a6e21eebaf412e2abd29736 to < 3ba3846cb3e2fb3c6fbf79e998472821b298419eaffected5ea8d10802ec4c153a6e21eebaf412e2abd29736 to < c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398affected5ea8d10802ec4c153a6e21eebaf412e2abd29736 to < 3575949513ea3b387b30dac1e69468a923c86cafaffected5ea8d10802ec4c153a6e21eebaf412e2abd29736 to < b2700f98b3f4dd19fb4315b70581e5caff89eb49affected5ea8d10802ec4c153a6e21eebaf412e2abd29736 to < c0d73be0af8c1310713bc39a8d7a22e35084e14faffected5ea8d10802ec4c153a6e21eebaf412e2abd29736 to < 62006a72b05e0d38727eef5188700f2488be5e89affected5ea8d10802ec4c153a6e21eebaf412e2abd29736 to < 35fb7d4a53d9e36d1b91161ea9870d9c6d57dccfaffected5ea8d10802ec4c153a6e21eebaf412e2abd29736 to < 1de7c3cf48fc41cd95adb12bd1ea9033a917798aaffected
Linux Linux
Default version status: affected
4.12affected0 to < 4.12unaffected4.14.296 to ≤ 4.14.*unaffected4.19.262 to ≤ 4.19.*unaffected5.4.220 to ≤ 5.4.*unaffected5.10.150 to ≤ 5.10.*unaffected5.15.75 to ≤ 5.15.*unaffected5.19.17 to ≤ 5.19.*unaffected6.0.3 to ≤ 6.0.*unaffected6.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/3ba3846cb3e2fb3c6fbf79e998472821b298419e ↗
- https://git.kernel.org/stable/c/c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398 ↗
- https://git.kernel.org/stable/c/3575949513ea3b387b30dac1e69468a923c86caf ↗
- https://git.kernel.org/stable/c/b2700f98b3f4dd19fb4315b70581e5caff89eb49 ↗
- https://git.kernel.org/stable/c/c0d73be0af8c1310713bc39a8d7a22e35084e14f ↗
- https://git.kernel.org/stable/c/62006a72b05e0d38727eef5188700f2488be5e89 ↗
- https://git.kernel.org/stable/c/35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf ↗
- https://git.kernel.org/stable/c/1de7c3cf48fc41cd95adb12bd1ea9033a917798a ↗