tree 10095a9404a310996aed02d60f6ad0b5ed790229
parent a0832d47f7eb859f75301ae321be5dea4ccb17f3
author Gilles Peskine <Gilles.Peskine@arm.com> 1612868413 +0100
committer Gilles Peskine <Gilles.Peskine@arm.com> 1612868413 +0100

More robust code to set the IV

Check that the source address and the frame counter have the expected
length. Otherwise, if the test data was invalid, the test code could
build nonsensical inputs, potentially overflowing the iv buffer.

The primary benefit of this change is that it also silences a warning
from compiling with `gcc-10 -O3` (observed with GCC 10.2.0 on
Linux/amd64). GCC unrolled the loops and complained about a buffer
overflow with warnings like:
```
suites/test_suite_ccm.function: In function 'test_mbedtls_ccm_star_auth_decrypt':
suites/test_suite_ccm.function:271:15: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
  271 |         iv[i] = source_address->x[i];
      |         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~
suites/test_suite_ccm.function:254:19: note: at offset [13, 14] to object 'iv' with size 13 declared here
  254 |     unsigned char iv[13];
```
Just using memcpy instead of loops bypasses this warnings. The added
checks are a bonus.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>