On Ubuntu 20.04, in Release mode, gcc fails with this error:
In file included from /usr/include/string.h:495,
from /opt/rocm/include/hsa/hsa_api_trace.h:57,
from ../roctracer/src/util/hsa_rsrc_factory.h:29,
from ../roctracer/src/util/hsa_rsrc_factory.cpp:25:
In function ‘char* strncpy(char*, const char*, size_t)’,
inlined from ‘const util::AgentInfo* util::HsaRsrcFactory::AddAgentInfo(hsa_agent_t)’ at ../roctracer/src/util/hsa_rsrc_factory.cpp:323:12:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:106:34: error: ‘char* __builtin___strncpy_chk(char*, const char*, long unsigned int, long unsigned int)’ specified bound depends on the length of the source argument [-Werror=stringop-overflow=]
106 | return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
| ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../roctracer/src/util/hsa_rsrc_factory.cpp: In member function ‘const util::AgentInfo* util::HsaRsrcFactory::AddAgentInfo(hsa_agent_t)’:
../roctracer/src/util/hsa_rsrc_factory.cpp:322:39: note: length computed here
322 | const int gfxip_label_len = strlen(agent_info->name) - 2;
| ~~~~~~^~~~~~~~~~~~~~~~~~
The error is caused by the following 2 lines:
const int gfxip_label_len = strlen(agent_info->name) - 2;
strncpy(agent_info->gfxip, agent_info->name, gfxip_label_len);
The size argument to strncpy should not depend on the input string.
Since the terminating character is not considered (the copy is at
most len - 2 bytes), using memcpy is preferable. Also, make sure
the destination does not overflow by clamping the size.
Change-Id: I37c5c45418e7c31a017581b6c16e5d47cd61aec5
Laurent Morichetti
38009bfba4