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Replace all uses of sprintf with snprintf

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In all the cases where sprintf was being used within htop, snprintf
could have been used. This patch replaces all uses of sprintf with
snprintf which makes sure that if a buffer is too small to hold the
resulting string, the string is simply cut short instead of causing
a buffer overflow which leads to undefined behaviour.

`sizeof(variable)` was used in these cases, as opposed to `sizeof
variable` which is my personal preference because `sizeof(variable)`
was already used in one way or another in other parts of the code.
This commit is contained in:
Tomasz Kramkowski 2016-12-29 19:42:41 +01:00
parent 8af4d9f453
commit 2b5c1b4b13
6 changed files with 25 additions and 25 deletions
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24
CPUMeter.c
View File

@ -48,7 +48,7 @@ static void CPUMeter_init(Meter* this) {
int cpu = this->param;
if (this->pl->cpuCount > 1) {
char caption[10];
sprintf(caption, "%-3d", Settings_cpuId(this->pl->settings, cpu - 1));
snprintf(caption, sizeof(caption), "%-3d", Settings_cpuId(this->pl->settings, cpu - 1));
Meter_setCaption(this, caption);
}
if (this->param == 0)
@ -74,44 +74,44 @@ static void CPUMeter_display(Object* cast, RichString* out) {
RichString_append(out, CRT_colors[METER_TEXT], "absent");
return;
}
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_NORMAL]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_NORMAL]);
RichString_append(out, CRT_colors[METER_TEXT], ":");
RichString_append(out, CRT_colors[CPU_NORMAL], buffer);
if (this->pl->settings->detailedCPUTime) {
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_KERNEL]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_KERNEL]);
RichString_append(out, CRT_colors[METER_TEXT], "sy:");
RichString_append(out, CRT_colors[CPU_KERNEL], buffer);
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_NICE]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_NICE]);
RichString_append(out, CRT_colors[METER_TEXT], "ni:");
RichString_append(out, CRT_colors[CPU_NICE_TEXT], buffer);
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_IRQ]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_IRQ]);
RichString_append(out, CRT_colors[METER_TEXT], "hi:");
RichString_append(out, CRT_colors[CPU_IRQ], buffer);
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_SOFTIRQ]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_SOFTIRQ]);
RichString_append(out, CRT_colors[METER_TEXT], "si:");
RichString_append(out, CRT_colors[CPU_SOFTIRQ], buffer);
if (this->values[CPU_METER_STEAL]) {
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_STEAL]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_STEAL]);
RichString_append(out, CRT_colors[METER_TEXT], "st:");
RichString_append(out, CRT_colors[CPU_STEAL], buffer);
}
if (this->values[CPU_METER_GUEST]) {
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_GUEST]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_GUEST]);
RichString_append(out, CRT_colors[METER_TEXT], "gu:");
RichString_append(out, CRT_colors[CPU_GUEST], buffer);
}
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_IOWAIT]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_IOWAIT]);
RichString_append(out, CRT_colors[METER_TEXT], "wa:");
RichString_append(out, CRT_colors[CPU_IOWAIT], buffer);
} else {
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_KERNEL]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_KERNEL]);
RichString_append(out, CRT_colors[METER_TEXT], "sys:");
RichString_append(out, CRT_colors[CPU_KERNEL], buffer);
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_NICE]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_NICE]);
RichString_append(out, CRT_colors[METER_TEXT], "low:");
RichString_append(out, CRT_colors[CPU_NICE_TEXT], buffer);
if (this->values[CPU_METER_IRQ]) {
sprintf(buffer, "%5.1f%% ", this->values[CPU_METER_IRQ]);
snprintf(buffer, sizeof(buffer), "%5.1f%% ", this->values[CPU_METER_IRQ]);
RichString_append(out, CRT_colors[METER_TEXT], "vir:");
RichString_append(out, CRT_colors[CPU_GUEST], buffer);
}

8
LoadAverageMeter.c
View File

@ -28,11 +28,11 @@ static void LoadAverageMeter_updateValues(Meter* this, char* buffer, int size) {
static void LoadAverageMeter_display(Object* cast, RichString* out) {
Meter* this = (Meter*)cast;
char buffer[20];
sprintf(buffer, "%.2f ", this->values[0]);
snprintf(buffer, sizeof(buffer), "%.2f ", this->values[0]);
RichString_write(out, CRT_colors[LOAD_AVERAGE_ONE], buffer);
sprintf(buffer, "%.2f ", this->values[1]);
snprintf(buffer, sizeof(buffer), "%.2f ", this->values[1]);
RichString_append(out, CRT_colors[LOAD_AVERAGE_FIVE], buffer);
sprintf(buffer, "%.2f ", this->values[2]);
snprintf(buffer, sizeof(buffer), "%.2f ", this->values[2]);
RichString_append(out, CRT_colors[LOAD_AVERAGE_FIFTEEN], buffer);
}
@ -48,7 +48,7 @@ static void LoadMeter_updateValues(Meter* this, char* buffer, int size) {
static void LoadMeter_display(Object* cast, RichString* out) {
Meter* this = (Meter*)cast;
char buffer[20];
sprintf(buffer, "%.2f ", ((Meter*)this)->values[0]);
snprintf(buffer, sizeof(buffer), "%.2f ", ((Meter*)this)->values[0]);
RichString_write(out, CRT_colors[LOAD], buffer);
}

2
Process.c
View File

@ -198,7 +198,7 @@ void Process_setupColumnWidths() {
snprintf(Process_titleBuffer[i], 20, "%*s ", digits, Process_pidColumns[i].label);
Process_fields[Process_pidColumns[i].id].title = Process_titleBuffer[i];
}
sprintf(Process_pidFormat, "%%%dd ", digits);
snprintf(Process_pidFormat, sizeof(Process_pidFormat), "%%%dd ", digits);
}
void Process_humanNumber(RichString* str, unsigned long number, bool coloring) {

8
TasksMeter.c
View File

@ -40,7 +40,7 @@ static void TasksMeter_display(Object* cast, RichString* out) {
int processes = (int) this->values[2];
sprintf(buffer, "%d", processes);
snprintf(buffer, sizeof(buffer), "%d", processes);
RichString_write(out, CRT_colors[METER_VALUE], buffer);
int threadValueColor = CRT_colors[METER_VALUE];
int threadCaptionColor = CRT_colors[METER_TEXT];
@ -50,18 +50,18 @@ static void TasksMeter_display(Object* cast, RichString* out) {
}
if (!settings->hideUserlandThreads) {
RichString_append(out, CRT_colors[METER_TEXT], ", ");
sprintf(buffer, "%d", (int)this->values[1]);
snprintf(buffer, sizeof(buffer), "%d", (int)this->values[1]);
RichString_append(out, threadValueColor, buffer);
RichString_append(out, threadCaptionColor, " thr");
}
if (!settings->hideKernelThreads) {
RichString_append(out, CRT_colors[METER_TEXT], ", ");
sprintf(buffer, "%d", (int)this->values[0]);
snprintf(buffer, sizeof(buffer), "%d", (int)this->values[0]);
RichString_append(out, threadValueColor, buffer);
RichString_append(out, threadCaptionColor, " kthr");
}
RichString_append(out, CRT_colors[METER_TEXT], "; ");
sprintf(buffer, "%d", (int)this->values[3]);
snprintf(buffer, sizeof(buffer), "%d", (int)this->values[3]);
RichString_append(out, CRT_colors[TASKS_RUNNING], buffer);
RichString_append(out, CRT_colors[METER_TEXT], " running");
}

2
TraceScreen.c
View File

@ -99,7 +99,7 @@ bool TraceScreen_forkTracer(TraceScreen* this) {
dup2(this->fdpair[1], STDERR_FILENO);
int ok = fcntl(this->fdpair[1], F_SETFL, O_NONBLOCK);
if (ok != -1) {
sprintf(buffer, "%d", this->super.process->pid);
snprintf(buffer, sizeof(buffer), "%d", this->super.process->pid);
execlp("strace", "strace", "-p", buffer, NULL);
}
const char* message = "Could not execute 'strace'. Please make sure it is available in your $PATH.";

6
UptimeMeter.c
View File

@ -33,11 +33,11 @@ static void UptimeMeter_updateValues(Meter* this, char* buffer, int len) {
}
char daysbuf[15];
if (days > 100) {
sprintf(daysbuf, "%d days(!), ", days);
snprintf(daysbuf, sizeof(daysbuf), "%d days(!), ", days);
} else if (days > 1) {
sprintf(daysbuf, "%d days, ", days);
snprintf(daysbuf, sizeof(daysbuf), "%d days, ", days);
} else if (days == 1) {
sprintf(daysbuf, "1 day, ");
snprintf(daysbuf, sizeof(daysbuf), "1 day, ");
} else {
daysbuf[0] = '\0';
}