linux-kernel - [PATCH] crypto: qat: Annotate struct adf_fw_counters with __counted

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Date:   Fri, 22 Sep 2023 10:54:33 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Giovanni Cabiddu <giovanni.cabiddu@...el.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Adam Guerin <adam.guerin@...el.com>,
        Lucas Segarra Fernandez <lucas.segarra.fernandez@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        qat-linux@...el.com, linux-crypto@...r.kernel.org,
        llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH] crypto: qat: Annotate struct adf_fw_counters 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 adf_fw_counters.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Giovanni Cabiddu <giovanni.cabiddu@...el.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Nathan Chancellor <nathan@...nel.org>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Tom Rix <trix@...hat.com>
Cc: Adam Guerin <adam.guerin@...el.com>
Cc: Lucas Segarra Fernandez <lucas.segarra.fernandez@...el.com>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: qat-linux@...el.com
Cc: linux-crypto@...r.kernel.org
Cc: llvm@...ts.linux.dev
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/crypto/intel/qat/qat_common/adf_fw_counters.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/intel/qat/qat_common/adf_fw_counters.c b/drivers/crypto/intel/qat/qat_common/adf_fw_counters.c
index cb6e09ef5c9f..6abe4736eab8 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_fw_counters.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_fw_counters.c
@@ -34,7 +34,7 @@ struct adf_ae_counters {
 
 struct adf_fw_counters {
 	u16 ae_count;
-	struct adf_ae_counters ae_counters[];
+	struct adf_ae_counters ae_counters[] __counted_by(ae_count);
 };
 
 static void adf_fw_counters_parse_ae_values(struct adf_ae_counters *ae_counters, u32 ae,
-- 
2.34.1