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Message-Id: <20230817211531.4193219-6-keescook@chromium.org>
Date: Thu, 17 Aug 2023 14:15:28 -0700
From: Kees Cook <keescook@...omium.org>
To: Johannes Berg <johannes@...solutions.net>
Cc: Kees Cook <keescook@...omium.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: [PATCH 6/7] wifi: cfg80211: Annotate struct cfg80211_scan_request with __counted_by
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 checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).
As found with Coccinelle[1], add __counted_by for struct cfg80211_scan_request.
Additionally, since the element count member must be set before accessing
the annotated flexible array member, move its initialization earlier.
[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Johannes Berg <johannes@...solutions.net>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: linux-wireless@...r.kernel.org
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
include/net/cfg80211.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 6efe216c01d2..a2afc94a5408 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2544,7 +2544,7 @@ struct cfg80211_scan_request {
struct cfg80211_scan_6ghz_params *scan_6ghz_params;
/* keep last */
- struct ieee80211_channel *channels[];
+ struct ieee80211_channel *channels[] __counted_by(n_channels);
};
static inline void get_random_mask_addr(u8 *buf, const u8 *addr, const u8 *mask)
--
2.34.1
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