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comparison miscprog/memwrite-grep.c @ 205:8bdc87c0fc03

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memwrite-grep hack-utility written
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Thu, 10 Dec 2015 07:29:35 +0000
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204:e9254e0234ab 205:8bdc87c0fc03
1 /*
2 * This utility performs a memmem() binary "grep", checking to see if a given
3 * binary file (firmware image) contains the $l1tm_mem_write implementation
4 * code found in our TCS211 objects and in that one C11x fw version for which
5 * we have the map file.
6 */
7
8 #define _GNU_SOURCE
9 #include <sys/types.h>
10 #include <sys/file.h>
11 #include <sys/stat.h>
12 #include <stdio.h>
13 #include <string.h>
14 #include <stdlib.h>
15 #include <unistd.h>
16
17 u_char needle[50] = {
18 0x30, 0xb5,
19 0x45, 0x68,
20 0x42, 0x78,
21 0x04, 0x3a,
22 0x12, 0x06,
23 0x13, 0x0e,
24 0x00, 0x2b,
25 0x09, 0xd0,
26 0x00, 0x22,
27 0x14, 0x18,
28 0x24, 0x7a,
29 0x54, 0x55,
30 0x52, 0x1c,
31 0x12, 0x04,
32 0x12, 0x0c,
33 0x01, 0x3b,
34 0x00, 0x2b,
35 0xf6, 0xd1,
36 0x00, 0x20,
37 0x88, 0x80,
38 0x00, 0x06,
39 0x00, 0x0e,
40 0x48, 0x70,
41 0x88, 0x70,
42 0x30, 0xbd
43 };
44
45 u_char *haystack;
46 size_t haystack_size;
47
48 read_file(filename)
49 char *filename;
50 {
51 int fd;
52 struct stat st;
53
54 fd = open(filename, O_RDONLY);
55 if (fd < 0) {
56 perror(filename);
57 exit(1);
58 }
59 fstat(fd, &st);
60 if (!S_ISREG(st.st_mode)) {
61 fprintf(stderr, "error: %s is not a regular file\n", filename);
62 exit(1);
63 }
64 haystack_size = st.st_size;
65 haystack = malloc(haystack_size);
66 if (!haystack) {
67 fprintf(stderr, "unable to malloc buffer for %s\n", filename);
68 exit(1);
69 }
70 read(fd, haystack, haystack_size);
71 close(fd);
72 }
73
74 main(argc, argv)
75 char **argv;
76 {
77 u_char *result;
78
79 if (argc != 2) {
80 fprintf(stderr, "usage: %s firmware.bin\n", argv[0]);
81 exit(1);
82 }
83 read_file(argv[1]);
84 result = memmem(haystack, haystack_size, needle, sizeof needle);
85 if (result)
86 printf("Found the needle bytes at offset 0x%x\n",
87 result - haystack);
88 else
89 printf("Needle bytes not found in this image\n");
90 exit(0);
91 }