linux-kernel - [PATCH 2/2] procfs: restore 0400 permissions on /proc/*/pagemap

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Message-Id: <1377534240-13227-2-git-send-email-tixxdz@opendz.org>
Date:	Mon, 26 Aug 2013 17:24:00 +0100
From:	Djalal Harouni <tixxdz@...ndz.org>
To:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com
Cc:	Djalal Harouni <tixxdz@...ndz.org>
Subject: [PATCH 2/2] procfs: restore 0400 permissions on /proc/*/pagemap

Do not give an fd on privileged /proc/*/pagemap files for free.

Restore the previous 0400 mode

Signed-off-by: Djalal Harouni <tixxdz@...ndz.org>
---
 fs/proc/base.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 6b162cd..93a1c89 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2605,7 +2605,7 @@ static const struct pid_entry tgid_base_stuff[] = {
 #ifdef CONFIG_PROC_PAGE_MONITOR
 	REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
 	REG("smaps",      S_IRUGO, proc_pid_smaps_operations),
-	REG("pagemap",    S_IRUGO, proc_pagemap_operations),
+	REG("pagemap",    S_IRUSR, proc_pagemap_operations),
 #endif
 #ifdef CONFIG_SECURITY
 	DIR("attr",       S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
@@ -2943,7 +2943,7 @@ static const struct pid_entry tid_base_stuff[] = {
 #ifdef CONFIG_PROC_PAGE_MONITOR
 	REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
 	REG("smaps",     S_IRUGO, proc_tid_smaps_operations),
-	REG("pagemap",    S_IRUGO, proc_pagemap_operations),
+	REG("pagemap",    S_IRUSR, proc_pagemap_operations),
 #endif
 #ifdef CONFIG_SECURITY
 	DIR("attr",      S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
-- 
1.7.11.7

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