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Fix out of boundary writes in XUtils 

It is possible to exceed the unsigned int data type on 64 bit systems
with enough available RAM. Use size_t in all places instead.

Proof of Concept: Create a 4 GB line in .htoprc file and run htop

$ dd if=/dev/zero bs=1024 count=4194304 | tr '\0' 'a' > ~/.htoprc
$ htop
Segmentation fault

Also avoid overflow of stack based "match" array in String_getToken.
This commit is contained in:
Tobias Stoeckmann 2022-01-11 18:55:41 +01:00 committed by BenBE
parent 6eab39c0ab
commit fde1243443
1 changed files with 7 additions and 4 deletions
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11
XUtils.c
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@ -101,6 +101,7 @@ inline bool String_contains_i(const char* s1, const char* s2) {
char* String_cat(const char* s1, const char* s2) {
const size_t l1 = strlen(s1);
const size_t l2 = strlen(s2);
assert(SIZE_MAX - l1 > l2);
char* out = xMalloc(l1 + l2 + 1);
memcpy(out, s1, l1);
memcpy(out + l1, s2, l2);
@ -122,10 +123,10 @@ char* String_trim(const char* in) {
}
char** String_split(const char* s, char sep, size_t* n) {
const unsigned int rate = 10;
const size_t rate = 10;
char** out = xCalloc(rate, sizeof(char*));
size_t ctr = 0;
unsigned int blocks = rate;
size_t blocks = rate;
const char* where;
while ((where = strchr(s, sep)) != NULL) {
size_t size = (size_t)(where - s);
@ -177,6 +178,8 @@ char* String_getToken(const char* line, const unsigned short int numMatch) {
if (inWord == 1) {
if (count == numMatch && line[i] != ' ' && line[i] != '\0' && line[i] != '\n' && line[i] != (char)EOF) {
if (foundCount == sizeof(match) / sizeof(match[0]) - 1)
break;
match[foundCount] = line[i];
foundCount++;
}
@ -188,8 +191,8 @@ char* String_getToken(const char* line, const unsigned short int numMatch) {
}
char* String_readLine(FILE* fd) {
const unsigned int step = 1024;
unsigned int bufSize = step;
const size_t step = 1024;
size_t bufSize = step;
char* buffer = xMalloc(step + 1);
char* at = buffer;
for (;;) {