firmware-utils: mkfwimage: fix more errors reported by gcc-6/7/9

src/mkfwimage.c:276:8: error: format '%lld' expects argument of type 'long long int', but argument 4 has type '__off_t' {aka 'const long int'} [-Werror=format=]
src/fw.h:71:36: error: format '%llu' expects argument of type 'long long unsigned int', but argument 6 has type '__off_t' {aka 'long int'} [-Werror=format=]
    inlined from 'main' at src/mkfwimage.c:543:12:
/string_fortified.h:106:10: error: '__builtin_strncpy' output truncated before terminating nul copying 4 bytes from a string of the same length [-Werror=stringop-truncation]
    inlined from 'write_part' at src/mkfwimage.c:235:2,
string_fortified.h:106:10: error: '__builtin_strncpy' specified bound 16 equals destination size [-Werror=stringop-truncation]
    inlined from 'main' at src/mkfwimage.c:477:5:
string_fortified.h:106:10: error: '__builtin_strncpy' specified bound 256 equals destination size [-Werror=stringop-truncation]
    inlined from 'main' at src/mkfwimage.c:496:5:
string_fortified.h:106:10: error: '__builtin_strncpy' specified bound 4096 equals destination size [-Werror=stringop-truncation]
    inlined from 'main' at src/mkfwimage.c:481:5:
string_fortified.h:106:10: error: '__builtin_strncpy' specified bound 4096 equals destination size [-Werror=stringop-truncation]
    inlined from 'main' at src/mkfwimage.c:485:5:
string_fortified.h:106:10: error: '__builtin_strncpy' specified bound 16 equals destination size [-Werror=stringop-truncation]

Runtested on ath79 and UBNT Bullet M XW.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

tools/firmware-utils/Makefile

@@ -38,7 +38,7 @@ define Host/Compile
 	$(call cc,mkzynfw)
 	$(call cc,lzma2eva,-lz)
 	$(call cc,mkcasfw)
-	$(call cc,mkfwimage,-lz -Wall -Werror -Wextra)
+	$(call cc,mkfwimage,-lz -Wall -Werror -Wextra -D_FILE_OFFSET_BITS=64)
 	$(call cc,mkfwimage2,-lz)
 	$(call cc,imagetag imagetag_cmdline cyg_crc32)
 	$(call cc,add_header)

tools/firmware-utils/src/fw.h

@@ -27,6 +27,7 @@
 #define MAGIC_ENDS	"ENDS"
 
 #define MAGIC_LENGTH	4
+#define PART_NAME_LENGTH 16
 
 typedef struct header {
 	char magic[MAGIC_LENGTH];
@@ -37,7 +38,7 @@ typedef struct header {
 
 typedef struct part {
 	char magic[MAGIC_LENGTH];
-	char name[16];
+	char name[PART_NAME_LENGTH];
 	char pad[12];
 	u_int32_t memaddr;
 	u_int32_t index;

tools/firmware-utils/src/mkfwimage.c

@@ -230,9 +230,10 @@ static int write_part(void* mem, part_data_t* d)
 	memcpy(mem + sizeof(part_t), addr, d->stats.st_size);
 	munmap(addr, d->stats.st_size);
 
-	memset(p->name, 0, sizeof(p->name));
-	strncpy(p->magic, MAGIC_PART, MAGIC_LENGTH);
-	strncpy(p->name, d->partition_name, sizeof(p->name));
+	memset(p->name, 0, PART_NAME_LENGTH);
+	memcpy(p->magic, MAGIC_PART, MAGIC_LENGTH);
+	memcpy(p->name, d->partition_name, PART_NAME_LENGTH);
+
 	p->index = htonl(d->partition_index);
 	p->data_size = htonl(d->stats.st_size);
 	p->part_size = htonl(d->partition_length);
@@ -273,7 +274,7 @@ static void print_image_info(const image_info_t* im)
 	for (i = 0; i < im->part_count; ++i)
 	{
 		const part_data_t* d = &im->parts[i];
-		INFO(" %10s: %8lld bytes (free: %8lld)\n",
+		INFO(" %10s: %8ld bytes (free: %8ld)\n",
 		     d->partition_name,
 		     d->stats.st_size,
 		     d->partition_length - d->stats.st_size);
@@ -372,7 +373,7 @@ static int validate_image_layout(image_info_t* im)
 			return -3;
 		}
 		if (d->stats.st_size > d->partition_length) {
-			ERROR("File '%s' too big (%d) - max size: 0x%08X (exceeds %llu bytes)\n",
+			ERROR("File '%s' too big (%d) - max size: 0x%08X (exceeds %lu bytes)\n",
 				       	d->filename, i, d->partition_length,
 					d->stats.st_size - d->partition_length);
 			return -4;
@@ -474,30 +475,30 @@ int main(int argc, char* argv[])
 		switch (o) {
 		case 'v':
 			if (optarg)
-				strncpy(im.version, optarg, sizeof(im.version));
+				strncpy(im.version, optarg, sizeof(im.version) - 1);
 			break;
 		case 'o':
 			if (optarg)
-				strncpy(im.outputfile, optarg, sizeof(im.outputfile));
+				strncpy(im.outputfile, optarg, sizeof(im.outputfile) - 1);
 			break;
 		case 'm':
 			if (optarg)
-				strncpy(im.magic, optarg, sizeof(im.magic));
+				strncpy(im.magic, optarg, sizeof(im.magic) - 1);
 			break;
 		case 'h':
 			usage(argv[0]);
 			return -1;
 		case 'k':
 			if (optarg)
-				strncpy(kernelfile, optarg, sizeof(kernelfile));
+				strncpy(kernelfile, optarg, sizeof(kernelfile) - 1);
 			break;
 		case 'r':
 			if (optarg)
-				strncpy(rootfsfile, optarg, sizeof(rootfsfile));
+				strncpy(rootfsfile, optarg, sizeof(rootfsfile) - 1);
 			break;
 		case 'B':
 			if (optarg)
-				strncpy(board_name, optarg, sizeof(board_name));
+				strncpy(board_name, optarg, sizeof(board_name) - 1);
 			break;
 		}
 	}