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@ellerman.id.au Cc: Jordan Niethe jniethe5@gmail.com Cc: Stewart Smith stewart@linux.ibm.com Fixes: c8742f85125d ("powerpc/powernv: Expose OPAL firmware symbol map") Cc: stable@vger.kernel.org Signed-off-by: Andrew Donnellan ajd@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])); + symbol_map_attr.size = be64_to_cpu(syms[1]);

- rc = sysfs_create_bin_file(opal_kobj, &bin_attr_symbol_map); + rc = sysfs_create_bin_file(opal_kobj, &symbol_map_attr); if (rc) pr_warn("Error %d creating OPAL symbols file\n", rc); }