bsd_acct: plain current->real_parent access is not always safe
authorPavel Emelyanov <xemul@openvz.org>
Mon, 24 Mar 2008 19:29:52 +0000 (12:29 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 25 Mar 2008 02:22:19 +0000 (19:22 -0700)
commita846a1954b6397e844fe1e258af7598897ec6159
treea90b3a593d528c299fd90e9e84fe17a7cdb23733
parent4dd4b920218326231156c7991ce5b94afad841c3
bsd_acct: plain current->real_parent access is not always safe

This is minor, but dereferencing even current real_parent is not safe on debug
kernels, since the memory, this points to, can be unmapped - RCU protection is
required.

Besides, the tgid field is deprecated and is to be replaced with task_tgid_xxx
call (the 2nd patch), so RCU will be required anyway.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/acct.c