linux-kernel - Re: PATCH [1/1]: audit: acquire creds selectively to reduce atomic op overhead

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 11 Mar 2011 16:33:52 +0000
From:	David Howells <dhowells@...hat.com>
To:	Tony Jones <tonyj@...e.de>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	linux-audit@...hat.com, Eric Paris <eparis@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: PATCH [1/1]: audit: acquire creds selectively to reduce atomic op overhead

Tony Jones <tonyj@...e.de> wrote:

> I'm not seeing the 'tsk->real_cred' usage, can you clarify?

get_task_cred() and task_cred_xxxx() call __task_cred() which uses
tsk->real_cred.  These are the real credentials of the process, and the ones
that are used when the process is being acted upon and the ones that are
visible through /proc.

However, if a task is acting upon something, task->cred is used instead.  These
are not visible from the outside and may be overridden.  current_cred_xxx()
uses these.

It's possible that the credentials being used in audit_filter_rules() are
incorrect under most circumstances and should be task->cred, not
task->real_cred.

David
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/