From: Al Viro <viro@ZenIV.linux.org.uk>
Date: Wed, 2 Jan 2008 14:09:57 +0000 (+0000)
Subject: restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace pid
X-Git-Tag: v2.6.24-rc7~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=831830b5a2b5d413407adf380ef62fe17d6fcbf2;p=pandora-kernel.git

restrict reading from /proc/<pid>/maps to those who share ->mm or can ptrace pid

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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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