linux-hardening - [PATCH][next] wifi: mac80211: Add __counted_by for struct ieee802_11_elems and use struct

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Date: Mon, 9 Oct 2023 11:59:41 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Johannes Berg <johannes@...solutions.net>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] wifi: mac80211: Add __counted_by for struct
 ieee802_11_elems and use struct_size()

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

While there, use struct_size() helper, instead of the open-coded
version, to calculate the size for the allocation of the whole
flexible structure including, of course, the flexible-array member.

This code was found with the help of Coccinelle, and audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 net/mac80211/ieee80211_i.h | 2 +-
 net/mac80211/util.c        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index e92eaf835ee0..0d3d386445c5 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1746,7 +1746,7 @@ struct ieee802_11_elems {
 	 */
 	size_t scratch_len;
 	u8 *scratch_pos;
-	u8 scratch[];
+	u8 scratch[] __counted_by(scratch_len);
 };
 
 static inline struct ieee80211_local *hw_to_local(
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 98a3bffc6991..a91b0e7795a4 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1612,7 +1612,7 @@ ieee802_11_parse_elems_full(struct ieee80211_elems_parse_params *params)
 	int nontransmitted_profile_len = 0;
 	size_t scratch_len = 3 * params->len;
 
-	elems = kzalloc(sizeof(*elems) + scratch_len, GFP_ATOMIC);
+	elems = kzalloc(struct_size(elems, scratch, scratch_len), GFP_ATOMIC);
 	if (!elems)
 		return NULL;
 	elems->ie_start = params->start;
-- 
2.34.1