11913091 |
1 | // vim:shiftwidth=2:expandtab |
2 | #include <stdio.h> |
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3 | |
4 | #include "header.h" |
5 | #include "sys_cacheflush.h" |
6 | |
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7 | #include "override.c" |
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8 | |
9 | // note: first mask must be always full for search algo |
10 | static const unsigned int sig_mask_all[] = { |
11 | 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff, |
12 | 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff |
13 | }; |
0881206b |
14 | |
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15 | static const unsigned int sig_open[] = { |
16 | 0xe59cc000, 0xe33c0000, 0x1a000003, 0xef900005 |
17 | }; |
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18 | #define sig_mask_open sig_mask_all |
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19 | |
20 | static const unsigned int sig_mmap[] = { |
21 | 0xe92d000f, 0xe1a0000d, 0xef90005a, 0xe28dd010 |
22 | }; |
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23 | #define sig_mask_mmap sig_mask_all |
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24 | |
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25 | static const unsigned int sig_mmap2[] = { |
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26 | 0xe52d5004, 0xe59d5008, 0xe52d4004, 0xe59d4008, |
27 | 0xe1b0ca05, 0x1a000006, 0xe1a05625, 0xef9000c0 |
28 | }; |
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29 | #define sig_mask_mmap2 sig_mask_all |
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30 | |
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31 | static const unsigned int sig_read[] = { |
32 | 0xe59fc080, 0xe59cc000, 0xe33c0000, 0x1a000003, 0xef900003 |
33 | }; |
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34 | #define sig_mask_read sig_mask_all |
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35 | |
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36 | static const unsigned int sig_ioctl[] = { |
37 | 0xef900036, 0xe3700a01, 0x312fff1e |
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38 | }; |
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39 | #define sig_mask_ioctl sig_mask_all |
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40 | |
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41 | static const unsigned int sig_sigaction[] = { |
42 | 0xe59f300c, 0xe3530000, 0x0a000000, 0xea000000, 0xea000000 |
43 | }; |
44 | static const unsigned int sig_mask_sigaction[] = { |
45 | 0xffffffff, 0xffffffff, 0xffffffff, 0xff000000, 0xff000000 |
46 | }; |
47 | |
db9191ed |
48 | static const unsigned int sig_execve[] = { |
49 | 0xef90000b, 0xe1a04000, 0xe3700a01 |
50 | }; |
51 | #define sig_mask_execve sig_mask_all |
52 | |
53 | static const unsigned int sig_execve2[] = { |
54 | 0xef90000b, 0xe3700a01, 0xe1a04000 |
55 | }; |
56 | #define sig_mask_execve2 sig_mask_all |
57 | |
58 | static const unsigned int sig_chdir[] = { |
59 | 0xef90000c, 0xe3700a01, 0x312fff1e, 0xea0004bb |
60 | }; |
61 | static const unsigned int sig_mask_chdir[] = { |
62 | 0xffffffff, 0xffffffff, 0xffffffff, 0xff000000 |
63 | }; |
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64 | |
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65 | #define PATCH_(f,p) { sig_##p, sig_mask_##p, ARRAY_SIZE(sig_##p), w_##f } |
66 | #define PATCH(f) PATCH_(f,f) |
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67 | |
68 | static const struct { |
69 | const unsigned int *sig; |
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70 | const unsigned int *sig_mask; |
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71 | size_t sig_cnt; |
72 | void *func; |
73 | } patches[] = { |
74 | PATCH(open), |
75 | PATCH(mmap), |
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76 | PATCH(mmap2), // mmap2 syscall |
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77 | PATCH(read), |
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78 | PATCH(ioctl), |
79 | PATCH(sigaction), |
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80 | // PATCH_(execve, execve2), // hangs |
81 | PATCH(chdir), |
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82 | }; |
83 | |
84 | void do_patches(void *ptr, unsigned int size) |
85 | { |
86 | int i, s; |
87 | |
88 | for (i = 0; i < ARRAY_SIZE(patches); i++) { |
89 | const unsigned int *sig = patches[i].sig; |
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90 | const unsigned int *sig_mask = patches[i].sig_mask; |
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91 | unsigned int *seg = (void *)(((long)ptr + 3) & ~3); |
92 | unsigned int *seg_end = seg + size / 4; |
93 | unsigned int sig0 = sig[0]; |
94 | |
95 | for (; seg < seg_end; seg++) { |
96 | if (*seg != sig0) |
97 | continue; |
98 | |
99 | for (s = 1; s < patches[i].sig_cnt; s++) |
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100 | if ((seg[s] ^ sig[s]) & sig_mask[s]) |
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101 | break; |
102 | |
103 | if (s == patches[i].sig_cnt) |
104 | goto found; |
105 | } |
106 | continue; |
107 | |
108 | found: |
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109 | dbg(" patch #%i @ %08x\n", i, (int)seg); |
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110 | seg[0] = 0xe59ff000; // ldr pc, [pc] |
111 | seg[1] = 0; |
112 | seg[2] = (unsigned int)patches[i].func; |
113 | } |
114 | |
115 | sys_cacheflush(ptr, (char *)ptr + size); |
116 | } |
117 | |