linux-kernel - [PATCH 5.0 158/238] powerpc/powernv: Make opal log only readable by root

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Message-Id: <20190322111307.617971480@linuxfoundation.org>
Date:   Fri, 22 Mar 2019 12:16:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jordan Niethe <jniethe5@...il.com>,
        Stewart Smith <stewart@...ux.ibm.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 5.0 158/238] powerpc/powernv: Make opal log only readable by root

5.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jordan Niethe <jniethe5@...il.com>

commit 7b62f9bd2246b7d3d086e571397c14ba52645ef1 upstream.

Currently the opal log is globally readable. It is kernel policy to
limit the visibility of physical addresses / kernel pointers to root.
Given this and the fact the opal log may contain this information it
would be better to limit the readability to root.

Fixes: bfc36894a48b ("powerpc/powernv: Add OPAL message log interface")
Cc: stable@...r.kernel.org # v3.15+
Signed-off-by: Jordan Niethe <jniethe5@...il.com>
Reviewed-by: Stewart Smith <stewart@...ux.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@....ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/platforms/powernv/opal-msglog.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/platforms/powernv/opal-msglog.c
+++ b/arch/powerpc/platforms/powernv/opal-msglog.c
@@ -98,7 +98,7 @@ static ssize_t opal_msglog_read(struct f
 }
 
 static struct bin_attribute opal_msglog_attr = {
-	.attr = {.name = "msglog", .mode = 0444},
+	.attr = {.name = "msglog", .mode = 0400},
 	.read = opal_msglog_read
 };