Description: io_uring/kbuf: defer release of mapped buffer rings
References:
 https://bugs.chromium.org/p/project-zero/issues/detail?id=2504
 https://bugzilla.redhat.com/show_bug.cgi?id=2254050
 https://www.openwall.com/lists/oss-security/2024/04/24/3
Notes:
 carnil> Issue introduced with c56e022c0a27 ("io_uring: add support for
 carnil> user mapped provided buffer ring") in 6.4-rc1.
Bugs:
upstream: released (6.7-rc4) [c392cbecd8eca4c53f2bf508731257d9d0a21c2d]
6.1-upstream-stable: N/A "Vulnerable code not present"
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.6.8-1)
6.1-bookworm-security: N/A "Vulnerable code not present"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"