linux-kernel - [PATCH] crypto: qat - avoid memcpy() overflow warning

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Date: Wed,  3 Jan 2024 17:26:02 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Damian Muszynski <damian.muszynski@...el.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Jie Wang <jie.wang@...el.com>,
	qat-linux@...el.com,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: qat - avoid memcpy() overflow warning

From: Arnd Bergmann <arnd@...db.de>

The use of array_size() leads gcc to assume the memcpy() can have a larger
limit than actually possible, which triggers a string fortification warning:

In file included from include/linux/string.h:296,
                 from include/linux/bitmap.h:12,
                 from include/linux/cpumask.h:12,
                 from include/linux/sched.h:16,
                 from include/linux/delay.h:23,
                 from include/linux/iopoll.h:12,
                 from drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c:3:
In function 'fortify_memcpy_chk',
    inlined from 'adf_gen4_init_thd2arb_map' at drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c:401:3:
include/linux/fortify-string.h:579:4: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
  579 |    __write_overflow_field(p_size_field, size);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/fortify-string.h:588:4: error: call to '__read_overflow2_field' declared with attribute warning: detected read beyond size of field (2nd parameter); maybe use struct_group()? [-Werror=attribute-warning]
  588 |    __read_overflow2_field(q_size_field, size);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Add an explicit range check to avoid this.

Fixes: 5da6a2d5353e ("crypto: qat - generate dynamically arbiter mappings")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c b/drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c
index 9985683056d5..f752653ccb47 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c
@@ -398,6 +398,9 @@ int adf_gen4_init_thd2arb_map(struct adf_accel_dev *accel_dev)
 			 ADF_GEN4_ADMIN_ACCELENGINES;
 
 	if (srv_id == SVC_DCC) {
+		if (ae_cnt > ICP_QAT_HW_AE_DELIMITER)
+			return -EINVAL;
+
 		memcpy(thd2arb_map, thrd_to_arb_map_dcc,
 		       array_size(sizeof(*thd2arb_map), ae_cnt));
 		return 0;
-- 
2.39.2