]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
signals: check_kill_permission: check session under tasklist_lock
authorOleg Nesterov <oleg@tv-sign.ru>
Wed, 30 Apr 2008 07:53:01 +0000 (00:53 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 30 Apr 2008 15:29:37 +0000 (08:29 -0700)
commit2e2ba22ea4fd4bb85f0fa37c521066db6775cbef
treeaada1523affbcbe1301decad43ad0875e1f680c4
parent53c30337f2c61aff6eecf2a446e839641172f9bd
signals: check_kill_permission: check session under tasklist_lock

This wasn't documented, but as Atsushi Tsuji pointed out
check_kill_permission() needs tasklist_lock for task_session_nr().  I missed
this fact when removed tasklist from the callers.

Change check_kill_permission() to take tasklist_lock for the SIGCONT case.
Re-order security checks so that we take tasklist_lock only if/when it is
actually needed.  This is a minimal fix for now, tasklist will be removed
later.

Also change the code to use task_session() instead of task_session_nr().

Also, remove the SIGCONT check from cap_task_kill(), it is bogus (and the
whole function is bogus.  Serge, Eric, why it is still alive?).

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Atsushi Tsuji <a-tsuji@bk.jp.nec.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/signal.c