From: Rik van Riel <riel@redhat.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace pid
Date: Wed, 2 Jan 2008 09:37:19 -0500 [thread overview]
Message-ID: <20080102093719.4f9bc413@bree.surriel.com> (raw)
In-Reply-To: <20080102140957.GR27894@ZenIV.linux.org.uk>
On Wed, 2 Jan 2008 14:09:57 +0000
Al Viro <viro@ZenIV.linux.org.uk> wrote:
> Contents of /proc/*/maps is sensitive and may become sensitive
> after open() (e.g. if target originally shares our ->mm and later
> does exec on suid-root binary).
> Check at read() (actually, ->start() of iterator) time that
> mm_struct we'd grabbed and locked is
> * still the ->mm of target
> * equal to reader's ->mm or the target is ptracable by reader.
>
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Rik van Riel <riel@redhat.com>
--
All rights reversed.
next prev parent reply other threads:[~2008-01-02 14:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-02 14:09 [PATCH] restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace pid Al Viro
2008-01-02 14:37 ` Rik van Riel [this message]
2008-01-05 9:31 ` Andrew Morton
2008-01-05 9:48 ` Al Viro
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