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Ensure strncpy'ed strings are all null terminated

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If there is no null byte among the first n bytes of the source the
resulting string will not be properly null terminated.
Ensure that all strings that are copied via strncpy are properly
terminated copy "sizeof (dest) - 1" bytes and manually terminate
the string in the cases the array was not initialized.

Example compiler warning:
  ../daemon/gamemode-tests.c: In function ‘run_cpu_governor_tests’:
  ../daemon/gamemode-tests.c:326:4: warning: ‘strncpy’ specified bound
      256 equals destination size [-Wstringop-truncation]
    strncpy(defaultgov, currentgov, CONFIG_VALUE_MAX);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This commit is contained in:
Christian Kellner 2019-03-21 09:55:51 +01:00 committed by Alex Smith
parent db4dd87e22
commit bbde1d0357
4 changed files with 12 additions and 11 deletions
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3
daemon/gamemode-gpu.c
View File

@ -224,7 +224,8 @@ int game_mode_get_gpu(GameModeGPUInfo *info)
}
break;
case Vendor_AMD:
strncpy(info->amd_performance_level, buffer, CONFIG_VALUE_MAX);
strncpy(info->amd_performance_level, buffer, sizeof(info->amd_performance_level) - 1);
info->amd_performance_level[sizeof(info->amd_performance_level) - 1] = '\0';
break;
}

10
daemon/gamemode-tests.c
View File

@ -323,7 +323,7 @@ static int run_cpu_governor_tests(struct GameModeConfig *config)
if (defaultgov[0] == '\0') {
const char *currentgov = get_gov_state();
if (currentgov) {
strncpy(defaultgov, currentgov, CONFIG_VALUE_MAX);
strncpy(defaultgov, currentgov, CONFIG_VALUE_MAX - 1);
} else {
LOG_ERROR(
"Could not get current CPU governor state, this indicates an error! See rest "
@ -445,16 +445,16 @@ int run_gpu_optimisation_tests(struct GameModeConfig *config)
long expected_core = gpuinfo->nv_core;
long expected_mem = gpuinfo->nv_mem;
long expected_nv_powermizer_mode = gpuinfo->nv_powermizer_mode;
char expected_amd_performance_level[CONFIG_VALUE_MAX];
strncpy(expected_amd_performance_level, gpuinfo->amd_performance_level, CONFIG_VALUE_MAX);
char expected_amd_performance_level[CONFIG_VALUE_MAX] = { 0 };
strncpy(expected_amd_performance_level, gpuinfo->amd_performance_level, CONFIG_VALUE_MAX - 1);
/* Get current stats */
game_mode_get_gpu(gpuinfo);
long original_nv_core = gpuinfo->nv_core;
long original_nv_mem = gpuinfo->nv_mem;
long original_nv_powermizer_mode = gpuinfo->nv_powermizer_mode;
char original_amd_performance_level[CONFIG_VALUE_MAX];
strncpy(original_amd_performance_level, gpuinfo->amd_performance_level, CONFIG_VALUE_MAX);
char original_amd_performance_level[CONFIG_VALUE_MAX] = { 0 };
strncpy(original_amd_performance_level, gpuinfo->amd_performance_level, CONFIG_VALUE_MAX - 1);
/* account for when settings are not set */
if (expected_nv_powermizer_mode == -1)

2
daemon/governors-query.c
View File

@ -134,7 +134,7 @@ const char *get_gov_state(void)
return "malformed";
}
strncpy(governor, contents, sizeof(governor));
strncpy(governor, contents, sizeof(governor) - 1);
} else {
LOG_ERROR("Failed to read contents of %s\n", gov);
}

8
daemon/gpuclockctl.c
View File

@ -289,7 +289,7 @@ static int get_gpu_state_amd(struct GameModeGPUInfo *info)
return -1;
}
char buff[CONFIG_VALUE_MAX];
char buff[CONFIG_VALUE_MAX] = { 0 };
if (!fgets(buff, CONFIG_VALUE_MAX, file)) {
LOG_ERROR("Could not read file %s (%s)!\n", path, strerror(errno));
return -1;
@ -301,8 +301,8 @@ static int get_gpu_state_amd(struct GameModeGPUInfo *info)
}
/* Copy in the value from the file */
strncpy(info->amd_performance_level, buff, CONFIG_VALUE_MAX);
strncpy(info->amd_performance_level, buff, CONFIG_VALUE_MAX - 1);
info->amd_performance_level[CONFIG_VALUE_MAX - 1] = '\0';
return info == NULL;
}
@ -449,7 +449,7 @@ int main(int argc, char *argv[])
LOG_ERROR("Must pass performance level for AMD gpu!\n");
print_usage_and_exit();
}
strncpy(info.amd_performance_level, argv[3], CONFIG_VALUE_MAX);
strncpy(info.amd_performance_level, argv[3], CONFIG_VALUE_MAX - 1);
return set_gpu_state_amd(&info);
break;
default: