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Commit b0934990 authored by Jordan Niethe's avatar Jordan Niethe Committed by Greg Kroah-Hartman
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powerpc/powernv: Make opal log only readable by root 



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: bfc36894 ("powerpc/powernv: Add OPAL message log interface")
Cc: stable@vger.kernel.org # v3.15+
Signed-off-by: default avatarJordan Niethe <jniethe5@gmail.com>
Reviewed-by: default avatarStewart Smith <stewart@linux.ibm.com>
Reviewed-by: default avatarAndrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9b530550

arch/powerpc/platforms/powernv/opal-msglog.c

+1 −1
Original line number Diff line number Diff line
@@ -98,7 +98,7 @@ static ssize_t opal_msglog_read(struct file *file, struct kobject *kobj, 
}



static struct bin_attribute opal_msglog_attr = {

	.attr = {.name = "msglog", .mode = 0444},

	.attr = {.name = "msglog", .mode = 0400},

	.read = opal_msglog_read

};