Mitigate Baron SameEdit (CVE-2021-3156) vulnerability

sles 15.2
integer weakness #35

2

Weakness Breakdown


Definition:

An integer overflow occurs when the answer to an arithmetic operation exceeds the maximum size of the integer type used to store it. The resulting value will appear to have wrapped around the maximum value and started again at the minimum value. This would look like a clock that represents 13:00 by pointing at 1:00. An attacker can use an integer overflow during a buffer length calculation, which results in the allocated buffer being too small to hold the data copied into it, thus causing a buffer overflow.

Warning code(s):

Unless checked, the resulting number can exceed the expected range.

File Name:

fstrm-0.3.2/t/test_fstrm_io_file.c

Context:

The highlighted line of code below is the trigger point of this particular Sles 15.2 integer weakness.

 }

int
main(int argc, char **argv)
{
	struct timespec ts_a, ts_b;
	double elapsed;
	char *file_path;
	char *queue_model_str;
	unsigned num_messages;
	unsigned num_threads;
	fstrm_iothr_queue_model queue_model;

	if (argc != 5) {
		fprintf(stderr, "Usage: %s <FILE> <QUEUE MODEL> <NUM THREADS> <NUM MESSAGES>\n", argv[0]);
		fprintf(stderr, "\n");
		fprintf(stderr, "FILE is a filesystem path.\n");
		fprintf(stderr, "QUEUE MODEL is the string 'SPSC' or 'MPSC'.\n");
		fprintf(stderr, "NUM THREADS is an integer.\n");
		fprintf(stderr, "NUM MESSAGES is an integer.\n");
		return EXIT_FAILURE;
	}
	file_path = argv[1];
	queue_model_str = argv[2];
	num_threads = atoi(argv[3]);
	num_messages = atoi(argv[4]);
	if (num_threads < 1) {
		fprintf(stderr, "%s: Error: invalid number of threads\n", argv[0]);
		return EXIT_FAILURE;
	}
	if (num_messages < 1) {
		fprintf(stderr, "%s: Error: invalid number of messages\n", argv[0]);
		return EXIT_FAILURE;
	}

	if (strcasecmp(queue_model_str, "SPSC") == 0) {
		queue_model = FSTRM_IOTHR_QUEUE_MODEL_SPSC;
	} else if (strcasecmp(queue_model_str, "MPSC") == 0) {
		queue_model = FSTRM_IOTHR_QUEUE_MODEL_MPSC;
	} else {
		fprintf(stderr, "%s: Error: invalid queue model\n", argv[0]);
		return EXIT_FAILURE;
	}

	printf("testing fstrm_iothr with file= %s "
	       "queue_model= %s "
	       "num_threads= %u "
	       "num_messages= %u\n",
	       file_path, queue_model_str, num_threads, num_messages);
 

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