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Message-Id: <20231006201719.work.356-kees@kernel.org>
Date: Fri, 6 Oct 2023 13:17:20 -0700
From: Kees Cook <keescook@...omium.org>
To: Christian Lamparter <chunkeey@...glemail.com>
Cc: Kees Cook <keescook@...omium.org>, Kalle Valo <kvalo@...nel.org>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
linux-wireless@...r.kernel.org, linux-hardening@...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
Subject: [PATCH] wifi: p54: Annotate struct p54_cal_database 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 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 p54_cal_database.
Cc: Christian Lamparter <chunkeey@...glemail.com>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-wireless@...r.kernel.org
Cc: linux-hardening@...r.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/net/wireless/intersil/p54/p54.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/intersil/p54/p54.h b/drivers/net/wireless/intersil/p54/p54.h
index 3356ea708d81..770e348d1f6c 100644
--- a/drivers/net/wireless/intersil/p54/p54.h
+++ b/drivers/net/wireless/intersil/p54/p54.h
@@ -126,7 +126,7 @@ struct p54_cal_database {
size_t entry_size;
size_t offset;
size_t len;
- u8 data[];
+ u8 data[] __counted_by(entries);
};
#define EEPROM_READBACK_LEN 0x3fc
--
2.34.1
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