Description: fs/namespace.c: fix mountpoint reference counter race References: https://www.openwall.com/lists/oss-security/2020/05/04/2 Notes: carnil> According to the commit message this race condition between carnil> threads updating mountpoint reference counter affects longterm carnil> releases 4.4.220, 4.9.220, 4.14.177 and 4.19.118. and got fixed carnil> in 4.4.221, 4.9.221, 4.14.178 and 4.19.119. This was fixed carnil> upstream along with 4edbe133f851 ("make struct mountpoint bear carnil> the dentry reference to mountpoint, not struct mount") in carnil> 5.3-rc1. Similar issue (but not covered by the CVE) is adressed carnil> in b0d3869ce9ee ("propagate_one(): mnt_set_mountpoint() needs carnil> mount_lock"). This was adressed as well in 4.4.221, 4.9.221, carnil> 4.14.178 and 4.19.120. Additionally in 5.4.37 and 5.6.9. Bugs: upstream: released (5.3-rc1) [4edbe133f851c9e3a2f2a1db367e826b01e72594] 4.19-upstream-stable: released (4.19.119) [f511dc75d22e0c000fc70b54f670c2c17f5fba9a] 4.9-upstream-stable: released (4.9.221) [91e997939dda1a866f23ddfb043dcd4a3ff57524] 3.16-upstream-stable: released (3.16.84) [172f22d527862eb5aa9dd767826f5d68562943db] sid: released (5.3.7-1) 4.19-buster-security: released (4.19.118-2+deb10u1) [bugfix/all/fs-namespace.c-fix-mountpoint-reference-counter-race.patch] 4.9-stretch-security: released (4.9.210-1+deb9u1) [bugfix/all/fs-namespace.c-fix-mountpoint-reference-counter-race.patch] 3.16-jessie-security: released (3.16.84-1)