Description: FUSE-backed /proc/PID/cmdline
References:
 http://www.openwall.com/lists/oss-security/2018/05/17/1
Notes:
 carnil> Backport to 3.16.x (and older) seem at the moment more 
 carnil> substantial. E.g. in 272ddc8b37354c3fe111ab26d25e792629148eee
 carnil> v4.9-rc3 and earlier commits needs some extra care.
 carnil> Earlier, 6347e8d5bcce33fc36e651901efefbe2c93a43ef (in 4.9-rc2)
 carnil> access_remote_vm() write parameter is replaced with gup_flags.
Bugs:
upstream: released (4.17-rc6) [7f7ccc2ccc2e70c6054685f5e3522efa81556830]
4.19-upstream-stable: N/A "Fixed before branch point"
4.9-upstream-stable: released (4.9.101) [6f1abf8628b750905606996fd5ff5ea22d149238]
3.16-upstream-stable: ignored "Too risky to backport"
3.2-upstream-stable: ignored "EOL"
sid: released (4.16.12-1)
4.9-stretch-security: released (4.9.107-1)
3.16-jessie-security: ignored "Too risky to backport"
3.2-wheezy-security: ignored "EOL"