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authorOleg Nesterov <oleg@tv-sign.ru>2008-04-30 00:54:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 08:29:48 -0700
commit24336eaeecea860b2a82530e07c80bc7e0558b73 (patch)
tree12a34660f732e12ba18262083c1a2eea5a824f6a /kernel/sys.c
parent65450cebc6a2efde80ed45514f727e6e4dc1eafd (diff)
pids: introduce change_pid() helper
Based on Eric W. Biederman's idea. Without tasklist_lock held task_session()/task_pgrp() can return NULL if the caller races with setprgp()/setsid() which does detach_pid() + attach_pid(). This can happen even if task == current. Intoduce the new helper, change_pid(), which should be used instead. This way the caller always sees the special pid != NULL, either old or new. Also change the prototype of attach_pid(), it always returns 0 and nobody check the returned value. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sys.c')
0 files changed, 0 insertions, 0 deletions