From: Andrew Donnellan ajd@linux.ibm.com
commit e7de4f7b64c23e503a8c42af98d56f2a7462bd6d upstream.
Currently the OPAL symbol map is globally readable, which seems bad as it contains physical addresses.
Restrict it to root.
Fixes: c8742f85125d ("powerpc/powernv: Expose OPAL firmware symbol map") Cc: stable@vger.kernel.org # v3.19+ Suggested-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Andrew Donnellan ajd@linux.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20190503075253.22798-1-ajd@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/platforms/powernv/opal.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
--- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -617,7 +617,10 @@ static ssize_t symbol_map_read(struct fi 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) { @@ -634,10 +637,10 @@ 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); }