linux-hardening - [PATCH] security: don't treat structure as an array of struct hlist

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Date:   Thu,  7 Apr 2022 10:59:30 -0700
From:   Bill Wendling <morbo@...gle.com>
To:     Kees Cook <keescook@...omium.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Cc:     Bill Wendling <morbo@...gle.com>
Subject: [PATCH] security: don't treat structure as an array of struct hlist_head

The initialization of "security_hook_heads" is done by casting it to
another structure pointer type, and treating it as an array of "struct
hlist_head" objects. This requires an exception be made in "randstruct",
because otherwise it will emit an error, reducing the effectiveness of
the hardening technique.

Instead of using a cast, initialize the individual struct hlist_head
elements in security_hook_heads explicitly. This removes the need for
the cast and randstruct exception.

Signed-off-by: Bill Wendling <morbo@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
---
 scripts/gcc-plugins/randomize_layout_plugin.c | 2 --
 security/security.c                           | 9 ++++-----
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/scripts/gcc-plugins/randomize_layout_plugin.c b/scripts/gcc-plugins/randomize_layout_plugin.c
index 334741a31d0a..c2ec81b68505 100644
--- a/scripts/gcc-plugins/randomize_layout_plugin.c
+++ b/scripts/gcc-plugins/randomize_layout_plugin.c
@@ -52,8 +52,6 @@ static const struct whitelist_entry whitelist[] = {
 	{ "net/unix/af_unix.c", "unix_skb_parms", "char" },
 	/* big_key payload.data struct splashing */
 	{ "security/keys/big_key.c", "path", "void *" },
-	/* walk struct security_hook_heads as an array of struct hlist_head */
-	{ "security/security.c", "hlist_head", "security_hook_heads" },
 	{ }
 };
 
diff --git a/security/security.c b/security/security.c
index b7cf5cbfdc67..37a9eeb901e0 100644
--- a/security/security.c
+++ b/security/security.c
@@ -365,13 +365,12 @@ static void __init ordered_lsm_init(void)
 
 int __init early_security_init(void)
 {
-	int i;
-	struct hlist_head *list = (struct hlist_head *) &security_hook_heads;
 	struct lsm_info *lsm;
 
-	for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct hlist_head);
-	     i++)
-		INIT_HLIST_HEAD(&list[i]);
+#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
+	INIT_HLIST_HEAD(&security_hook_heads.NAME);
+#include "linux/lsm_hook_defs.h"
+#undef LSM_HOOK
 
 	for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
 		if (!lsm->enabled)
-- 
2.35.1.1178.g4f1659d476-goog