linux-kernel - [PATCH] sysctl: Allow non-root to read mmap_min

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Message-ID: <20100512083929.GC21829@os.inf.tu-dresden.de>
Date:	Wed, 12 May 2010 10:39:29 +0200
From:	Adam Lackorzynski <adam@...inf.tu-dresden.de>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] sysctl: Allow non-root to read mmap_min_addr value

Although /proc/sys/vm/mmap_min_addr has 644 permissions a read call returns
-EPERM. Allow any user to read the mmap_min_addr value.

Signed-off-by: Adam Lackorzynski <adam@...inf.tu-dresden.de>
---
 security/min_addr.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/security/min_addr.c b/security/min_addr.c
index e86f297..f728728 100644
--- a/security/min_addr.c
+++ b/security/min_addr.c
@@ -33,7 +33,7 @@ int mmap_min_addr_handler(struct ctl_table *table, int write,
 {
 	int ret;
 
-	if (!capable(CAP_SYS_RAWIO))
+	if (write && !capable(CAP_SYS_RAWIO))
 		return -EPERM;
 
 	ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
-- 
1.7.1

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