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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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10
daemon/gamemode-tests.c
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@@ -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)