Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 223/280] powerpc/powernv: Make opal log only readable by root | Date | Fri, 22 Mar 2019 12:16:16 +0100 |
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4.19-stable review patch. If anyone has any objections, please let me know.
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From: Jordan Niethe <jniethe5@gmail.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@vger.kernel.org # v3.15+ Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Reviewed-by: Stewart Smith <stewart@linux.ibm.com> Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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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