Bug 1227869 (CVE-2024-41001)

Summary: VUL-0: CVE-2024-41001: kernel: io_uring/sqpoll: work around a potential audit memory leak
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Kernel Bugs <kernel-bugs>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: camila.matos
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/413928/
Whiteboard: CVSSv3.1:SUSE:CVE-2024-41001:4.4:(AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-07-15 19:22:49 UTC 
In the Linux kernel, the following vulnerability has been resolved:

io_uring/sqpoll: work around a potential audit memory leak

kmemleak complains that there's a memory leak related to connect
handling:

unreferenced object 0xffff0001093bdf00 (size 128):
comm "iou-sqp-455", pid 457, jiffies 4294894164
hex dump (first 32 bytes):
02 00 fa ea 7f 00 00 01 00 00 00 00 00 00 00 00  ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
backtrace (crc 2e481b1a):
[<00000000c0a26af4>] kmemleak_alloc+0x30/0x38
[<000000009c30bb45>] kmalloc_trace+0x228/0x358
[<000000009da9d39f>] __audit_sockaddr+0xd0/0x138
[<0000000089a93e34>] move_addr_to_kernel+0x1a0/0x1f8
[<000000000b4e80e6>] io_connect_prep+0x1ec/0x2d4
[<00000000abfbcd99>] io_submit_sqes+0x588/0x1e48
[<00000000e7c25e07>] io_sq_thread+0x8a4/0x10e4
[<00000000d999b491>] ret_from_fork+0x10/0x20

which can can happen if:

1) The command type does something on the prep side that triggers an
   audit call.
2) The thread hasn't done any operations before this that triggered
   an audit call inside ->issue(), where we have audit_uring_entry()
   and audit_uring_exit().

Work around this by issuing a blanket NOP operation before the SQPOLL
does anything.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-41001
https://www.cve.org/CVERecord?id=CVE-2024-41001
https://git.kernel.org/stable/c/55c22375cbaa24f77dd13f9ae0642915444a1227
https://git.kernel.org/stable/c/9e810bd995823786ea30543e480e8a573e5e5667
https://git.kernel.org/stable/c/a40e90d9304629002fb17200f7779823a81191d3
https://git.kernel.org/stable/c/c4ce0ab27646f4206a9eb502d6fe45cb080e1cae
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-41001.mbox