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Date: Sun, 11 Mar 2012 00:25:12 +0100
From: Djalal Harouni <tixxdz@...ndz.org>
To: linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Al Viro <viro@...iv.linux.org.uk>,
Alexey Dobriyan <adobriyan@...il.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Vasiliy Kulikov <segoon@...nwall.com>,
Kees Cook <keescook@...omium.org>,
Solar Designer <solar@...nwall.com>,
WANG Cong <xiyou.wangcong@...il.com>,
James Morris <james.l.morris@...cle.com>,
Oleg Nesterov <oleg@...hat.com>,
linux-security-module@...r.kernel.org,
linux-fsdevel@...r.kernel.org
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>,
Greg KH <gregkh@...uxfoundation.org>,
Ingo Molnar <mingo@...e.hu>,
Stephen Wilson <wilsons@...rt.ca>,
"Jason A. Donenfeld" <Jason@...c4.com>,
Djalal Harouni <tixxdz@...ndz.org>,
Vasiliy Kulikov <segoon@...nwall.com>,
Solar Designer <solar@...nwall.com>
Subject: [PATCH 2/9] proc: add proc_file_private struct to store private information
In order to store and to track the private information specific to each
procfs opened file we convert the 'proc_maps_private' struct which is used
by the /proc/$pid/{maps,smaps,numa_maps} files to 'proc_file_private'
which can now be used by all the /proc/<pid>/* and even other /proc/* files
to store private information that must be kept across syscalls.
The proc_file_private struct includes an exec_id member which can be used
to track and to protect special and sensitive procfs files. In general it
will be set at open time to the task's exec_id to bind the file to this
task.
The proc_file_private struct offers the way to make the checks and to
bind special procfs files to the appropriate task in a consistent and
unified way.
Cc: Vasiliy Kulikov <segoon@...nwall.com>
Cc: Solar Designer <solar@...nwall.com>
Signed-off-by: Djalal Harouni <tixxdz@...ndz.org>
---
fs/proc/internal.h | 11 ++++++++++-
1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 2925775..a8968f6 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -61,10 +61,19 @@ extern const struct file_operations proc_pagemap_operations;
extern const struct file_operations proc_net_operations;
extern const struct inode_operations proc_net_inode_operations;
-struct proc_maps_private {
+/*
+ * Internal proc_file_private is used to track procfs files being
+ * processed especially the ones that varies during runtime.
+ */
+struct proc_file_private {
+ /* The Execve ID of the task, use this to protect special procfs
+ * files. Must be set at open time. */
+ u64 exec_id;
struct pid *pid;
+ struct inode *inode;
struct task_struct *task;
#ifdef CONFIG_MMU
+ /* For /proc/pid/{maps,smaps...} */
struct vm_area_struct *tail_vma;
#endif
};
--
1.7.1
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