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Linux: handle garbage in /proc/loadavg 

When parsing the content of /proc/loadavg via fscanf(3), ensure client
passed parameters are set to sanitized values.

Related to: #581
This commit is contained in:
Christian Göttsche 2021-03-28 18:10:13 +02:00 committed by BenBE
parent 272e72680b
commit 73f5ecf528
1 changed files with 18 additions and 12 deletions
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28
linux/Platform.c
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@ -209,19 +209,25 @@ int Platform_getUptime() {
} }
void Platform_getLoadAverage(double* one, double* five, double* fifteen) { void Platform_getLoadAverage(double* one, double* five, double* fifteen) {
int activeProcs, totalProcs, lastProc;
*one = 0;
*five = 0;
*fifteen = 0;
FILE* fd = fopen(PROCDIR "/loadavg", "r"); FILE* fd = fopen(PROCDIR "/loadavg", "r");
if (fd) { if (!fd)
int total = fscanf(fd, "%32lf %32lf %32lf %32d/%32d %32d", one, five, fifteen, goto err;
&activeProcs, &totalProcs, &lastProc);
(void) total; double scanOne, scanFive, scanFifteen;
assert(total == 6); int r = fscanf(fd, "%lf %lf %lf", &scanOne, &scanFive, &scanFifteen);
fclose(fd); fclose(fd);
} if (r != 3)
goto err;
*one = scanOne;
*five = scanFive;
*fifteen = scanFifteen;
return;
err:
*one = NAN;
*five = NAN;
*fifteen = NAN;
} }
int Platform_getMaxPid() { int Platform_getMaxPid() {