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authorEric W. Biederman <ebiederm@xmission.com>2012-12-21 20:27:12 -0800
committerEric W. Biederman <ebiederm@xmission.com>2012-12-25 16:10:05 -0800
commitc876ad7682155958d0c9c27afe9017925c230d64 (patch)
tree926064bd7909f60daed3b6b963555e57cab7b520 /fs/proc/generic.c
parent8382fcac1b813ad0a4e68a838fc7ae93fa39eda0 (diff)
pidns: Stop pid allocation when init dies
Oleg pointed out that in a pid namespace the sequence. - pid 1 becomes a zombie - setns(thepidns), fork,... - reaping pid 1. - The injected processes exiting. Can lead to processes attempting access their child reaper and instead following a stale pointer. That waitpid for init can return before all of the processes in the pid namespace have exited is also unfortunate. Avoid these problems by disabling the allocation of new pids in a pid namespace when init dies, instead of when the last process in a pid namespace is reaped. Pointed-out-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/proc/generic.c')
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