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