[PATCH] powerpc/powernv: Restrict OPAL symbol map to only be readable by root

[Greg KH]

On Fri, May 03, 2019 at 05:44:05PM +1000, Andrew Donnellan wrote:
> Currently the OPAL symbol map is globally readable, which seems bad as it
> contains physical addresses.
> 
> Restrict it to root.
> 
> Suggested-by: Michael Ellerman <mpe at ellerman.id.au>
> Cc: Jordan Niethe <jniethe5 at gmail.com>
> Cc: Stewart Smith <stewart at linux.ibm.com>
> Fixes: c8742f85125d ("powerpc/powernv: Expose OPAL firmware symbol map")
> Cc: stable at vger.kernel.org
> Signed-off-by: Andrew Donnellan <ajd at linux.ibm.com>
> ---
>  arch/powerpc/platforms/powernv/opal.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
> index 2b0eca104f86..505460a72052 100644
> --- a/arch/powerpc/platforms/powernv/opal.c
> +++ b/arch/powerpc/platforms/powernv/opal.c
> @@ -681,7 +681,10 @@ static ssize_t symbol_map_read(struct file *fp, struct kobject *kobj,
>  				       bin_attr->size);
>  }
>  
> -static BIN_ATTR_RO(symbol_map, 0);
> +static struct bin_attribute symbol_map_attr = {
> +	.attr = {.name = "symbol_map", .mode = 0400},
> +	.read = symbol_map_read
> +};
>  
>  static void opal_export_symmap(void)
>  {
> @@ -698,10 +701,10 @@ static void opal_export_symmap(void)
>  		return;
>  
>  	/* Setup attributes */
> -	bin_attr_symbol_map.private = __va(be64_to_cpu(syms[0]));
> -	bin_attr_symbol_map.size = be64_to_cpu(syms[1]);
> +        symbol_map_attr.private = __va(be64_to_cpu(syms[0]));

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