diff options
| author |   Andrew Donnellan <ajd@linux.ibm.com> | 2019-05-03 17:52:53 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-08-05 18:53:04 +1000 |
| commit | e7de4f7b64c23e503a8c42af98d56f2a7462bd6d (patch) | |
| tree | 257229b7c69375e6070b14880695d35f9fd9b847 | |
| parent | powerpc/configs: Disable SCOM_DEBUGFS in powernv_defconfig (diff) | |
| download | linux-dev-e7de4f7b64c23e503a8c42af98d56f2a7462bd6d.tar.xz linux-dev-e7de4f7b64c23e503a8c42af98d56f2a7462bd6d.zip | |
powerpc/powernv: Restrict OPAL symbol map to only be readable by root
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
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c index aba443be7daa..d271accf224b 100644 --- a/arch/powerpc/platforms/powernv/opal.c +++ b/arch/powerpc/platforms/powernv/opal.c @@ -705,7 +705,10 @@ 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) { @@ -722,10 +725,10 @@ 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); } |