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Message-Id: <20190322111335.399249553@linuxfoundation.org>
Date: Fri, 22 Mar 2019 12:16:16 +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 4.19 223/280] powerpc/powernv: Make opal log only readable by root
4.19-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
};
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