Skip to contentSkip to conversation

crypto: qat - avoid memcpy() overflow warning

PATCH In review Arnd Bergmann 3 participants 3 messages Jan 3, 2024 – Jan 26, 2024

Subsystems (2)
Crypto API QAT driver
lore
Share & tools
lore

Arnd Bergmann

author
#0 lore raw

PATCH 1/1 crypto: qat - avoid memcpy() overflow warning

From: Arnd Bergmann <[email protected]>

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 <[email protected]>
---
 drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c | 3 +++
 1 file changed, 3 insertions(+)
drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c +3 -0
index 9985683056d5..f752653ccb47 100644
@@ -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;
Signature · 1 line
2.39.2
maintainer Acked-by on v1 1/1
#1 lore raw
Quoted 21 lines · Arnd Bergmann

From: Arnd Bergmann <[email protected]>

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);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Quoted 4 lines

Add an explicit range check to avoid this.

Fixes 5da6a2d5353e ("crypto: qat - generate dynamically arbiter mappings")
Signed-off-by Arnd Bergmann <[email protected]>
Acked-by Giovanni Cabiddu <[email protected]>
maintainer
#2 lore raw
In reply to Arnd Bergmann
Quoted 21 lines · Arnd Bergmann

From: Arnd Bergmann <[email protected]>

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);
      |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Quoted 7 lines

Add an explicit range check to avoid this.

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

Patch applied. Thanks.

Signature · 3 lines
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt