libbpf: Extract and generalize CPU mask parsing logic

commit 6803ee25f0 upstream.

This logic is re-used for parsing a set of online CPUs. Having it as an
isolated piece of code working with input string makes it conveninent to test
this logic as well. While refactoring, also improve the robustness of original
implementation.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191212013548.1690564-1-andriin@fb.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/lib/bpf/libbpf.c

@@ -5905,62 +5905,104 @@ void bpf_program__bpil_offs_to_addr(struct bpf_prog_info_linear *info_linear)
 	}
 }
 
+int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz)
+{
+	int err = 0, n, len, start, end = -1;
+	bool *tmp;
+
+	*mask = NULL;
+	*mask_sz = 0;
+
+	/* Each sub string separated by ',' has format \d+-\d+ or \d+ */
+	while (*s) {
+		if (*s == ',' || *s == '\n') {
+			s++;
+			continue;
+		}
+		n = sscanf(s, "%d%n-%d%n", &start, &len, &end, &len);
+		if (n <= 0 || n > 2) {
+			pr_warning("Failed to get CPU range %s: %d\n", s, n);
+			err = -EINVAL;
+			goto cleanup;
+		} else if (n == 1) {
+			end = start;
+		}
+		if (start < 0 || start > end) {
+			pr_warning("Invalid CPU range [%d,%d] in %s\n",
+				   start, end, s);
+			err = -EINVAL;
+			goto cleanup;
+		}
+		tmp = realloc(*mask, end + 1);
+		if (!tmp) {
+			err = -ENOMEM;
+			goto cleanup;
+		}
+		*mask = tmp;
+		memset(tmp + *mask_sz, 0, start - *mask_sz);
+		memset(tmp + start, 1, end - start + 1);
+		*mask_sz = end + 1;
+		s += len;
+	}
+	if (!*mask_sz) {
+		pr_warning("Empty CPU range\n");
+		return -EINVAL;
+	}
+	return 0;
+cleanup:
+	free(*mask);
+	*mask = NULL;
+	return err;
+}
+
+int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz)
+{
+	int fd, err = 0, len;
+	char buf[128];
+
+	fd = open(fcpu, O_RDONLY);
+	if (fd < 0) {
+		err = -errno;
+		pr_warning("Failed to open cpu mask file %s: %d\n", fcpu, err);
+		return err;
+	}
+	len = read(fd, buf, sizeof(buf));
+	close(fd);
+	if (len <= 0) {
+		err = len ? -errno : -EINVAL;
+		pr_warning("Failed to read cpu mask from %s: %d\n", fcpu, err);
+		return err;
+	}
+	if (len >= sizeof(buf)) {
+		pr_warning("CPU mask is too big in file %s\n", fcpu);
+		return -E2BIG;
+	}
+	buf[len] = '\0';
+
+	return parse_cpu_mask_str(buf, mask, mask_sz);
+}
+
 int libbpf_num_possible_cpus(void)
 {
 	static const char *fcpu = "/sys/devices/system/cpu/possible";
-	int len = 0, n = 0, il = 0, ir = 0;
-	unsigned int start = 0, end = 0;
-	int tmp_cpus = 0;
 	static int cpus;
-	char buf[128];
+	int err, n, i, tmp_cpus;
-	int error = 0;
+	bool *mask;
-	int fd = -1;
 
 	tmp_cpus = READ_ONCE(cpus);
 	if (tmp_cpus > 0)
 		return tmp_cpus;
 
-	fd = open(fcpu, O_RDONLY);
+	err = parse_cpu_mask_file(fcpu, &mask, &n);
-	if (fd < 0) {
+	if (err)
-		error = errno;
+		return err;
-		pr_warning("Failed to open file %s: %s\n",
-			   fcpu, strerror(error));
-		return -error;
-	}
-	len = read(fd, buf, sizeof(buf));
-	close(fd);
-	if (len <= 0) {
-		error = len ? errno : EINVAL;
-		pr_warning("Failed to read # of possible cpus from %s: %s\n",
-			   fcpu, strerror(error));
-		return -error;
-	}
-	if (len == sizeof(buf)) {
-		pr_warning("File %s size overflow\n", fcpu);
-		return -EOVERFLOW;
-	}
-	buf[len] = '\0';
 
-	for (ir = 0, tmp_cpus = 0; ir <= len; ir++) {
+	tmp_cpus = 0;
-		/* Each sub string separated by ',' has format \d+-\d+ or \d+ */
+	for (i = 0; i < n; i++) {
-		if (buf[ir] == ',' || buf[ir] == '\0') {
+		if (mask[i])
-			buf[ir] = '\0';
+			tmp_cpus++;
-			n = sscanf(&buf[il], "%u-%u", &start, &end);
-			if (n <= 0) {
-				pr_warning("Failed to get # CPUs from %s\n",
-					   &buf[il]);
-				return -EINVAL;
-			} else if (n == 1) {
-				end = start;
-			}
-			tmp_cpus += end - start + 1;
-			il = ir + 1;
-		}
-	}
-	if (tmp_cpus <= 0) {
-		pr_warning("Invalid #CPUs %d from %s\n", tmp_cpus, fcpu);
-		return -EINVAL;
 	}
+	free(mask);
 
 	WRITE_ONCE(cpus, tmp_cpus);
 	return tmp_cpus;

tools/lib/bpf/libbpf_internal.h

@@ -63,6 +63,8 @@ do {				\
 #define pr_info(fmt, ...)	__pr(LIBBPF_INFO, fmt, ##__VA_ARGS__)
 #define pr_debug(fmt, ...)	__pr(LIBBPF_DEBUG, fmt, ##__VA_ARGS__)
 
+int parse_cpu_mask_str(const char *s, bool **mask, int *mask_sz);
+int parse_cpu_mask_file(const char *fcpu, bool **mask, int *mask_sz);
 int libbpf__load_raw_btf(const char *raw_types, size_t types_len,
 			 const char *str_sec, size_t str_len);