To avoid potential format string expansion via module parameters,
do not use the zpool type directly in request_module() without a
format string. Additionally, to avoid arbitrary modules being loaded
via zpool API (e.g. via the zswap_zpool_type module parameter) add a
"zpool-" prefix to the requested module, as well as module aliases for
the existing zpool types (zbud and zsmalloc).
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
mm/zbud.c | 1 +
mm/zpool.c | 2 +-
mm/zsmalloc.c | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/zbud.c b/mm/zbud.c
index a05790b1915e..aa74f7addab1 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -619,3 +619,4 @@ module_exit(exit_zbud);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Seth Jennings <sjenning@xxxxxxxxxxxxxxxxxx>");
MODULE_DESCRIPTION("Buddy Allocator for Compressed Pages");
+MODULE_ALIAS("zpool-zbud");
diff --git a/mm/zpool.c b/mm/zpool.c
index e40612a1df00..739cdf0d183a 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -150,7 +150,7 @@ struct zpool *zpool_create_pool(char *type, gfp_t gfp, struct zpool_ops *ops)
driver = zpool_get_driver(type);
if (!driver) {
- request_module(type);
+ request_module("zpool-%s", type);
driver = zpool_get_driver(type);
}
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 4e2fc83cb394..36af729eb3f6 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1199,3 +1199,4 @@ module_exit(zs_exit);
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Nitin Gupta <ngupta@xxxxxxxxxx>");
+MODULE_ALIAS("zpool-zsmalloc");
--
1.9.1
--
Kees Cook
Chrome OS Security
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