From 802762cdfff256b6bf3fdb624ac2c56ec043c4f0 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Thu, 25 May 2017 21:40:22 -0700
Subject: randstruct: Whitelist big_key path struct overloading
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The big_key payload structure intentionally stores a struct path in
two void pointers to avoid header soup. Whitelist this case:
security/keys/big_key.c: In function ‘big_key_read’:
security/keys/big_key.c:293:16: note: found mismatched rhs struct pointer types: ‘struct path’ and ‘void *’
struct path *path = (struct path *)&key->payload.data[big_key_path];
^~~~
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
scripts/gcc-plugins/randomize_layout_plugin.c | 2 ++
1 file changed, 2 insertions(+)
(limited to 'scripts/gcc-plugins/randomize_layout_plugin.c')
diff --git a/scripts/gcc-plugins/randomize_layout_plugin.c b/scripts/gcc-plugins/randomize_layout_plugin.c
index 2e710bf29699..c07818dac401 100644
--- a/scripts/gcc-plugins/randomize_layout_plugin.c
+++ b/scripts/gcc-plugins/randomize_layout_plugin.c
@@ -48,6 +48,8 @@ struct whitelist_entry {
static const struct whitelist_entry whitelist[] = {
/* unix_skb_parms via UNIXCB() buffer */
{ "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 list_head */
{ "security/security.c", "list_head", "security_hook_heads" },
{ }
--
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