Rev 4874 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | #include |
| 2 | #include |
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| 3 | #include |
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| 4 | #include |
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| 5 | #include |
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| 6 | #include |
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| 7 | #include |
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| 8 | |||
| 9874 | turbocat | 9 | #include |
| 4349 | Serge | 10 | |
| 11 | #include "list.h" |
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| 12 | #include "pe.h" |
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| 13 | |||
| 14 | #define unlikely(x) __builtin_expect(!!(x), 0) |
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| 15 | |||
| 16 | //#define DBG(format,...) printf(format,##__VA_ARGS__) |
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| 17 | |||
| 18 | #define DBG(format,...) |
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| 19 | |||
| 20 | static inline void sec_copy(void *dst, void *src, size_t len) |
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| 21 | { |
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| 22 | __asm__ __volatile__ ( |
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| 23 | "shrl $2, %%ecx \n\t" |
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| 24 | "rep movsl" |
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| 25 | : |
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| 26 | :"c"(len),"S"(src),"D"(dst) |
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| 27 | :"cc"); |
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| 28 | __asm__ __volatile__ ( |
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| 29 | "" |
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| 30 | :::"ecx","esi","edi"); |
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| 31 | }; |
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| 32 | |||
| 33 | void* load_libc(); |
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| 34 | |||
| 35 | static inline int IsPowerOf2(uint32_t val) |
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| 36 | { |
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| 37 | if(val == 0) |
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| 38 | return 0; |
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| 39 | return (val & (val - 1)) == 0; |
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| 40 | } |
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| 41 | |||
| 42 | int validate_pe(void *raw, size_t raw_size) |
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| 43 | { |
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| 44 | PIMAGE_DOS_HEADER dos; |
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| 45 | PIMAGE_NT_HEADERS32 nt; |
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| 46 | |||
| 47 | dos = (PIMAGE_DOS_HEADER)raw; |
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| 48 | |||
| 49 | if( !raw || raw_size < sizeof(IMAGE_DOS_HEADER) ) |
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| 50 | return 0; |
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| 51 | |||
| 52 | if( dos->e_magic != IMAGE_DOS_SIGNATURE || dos->e_lfanew <= 0) |
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| 53 | return 0; |
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| 54 | |||
| 55 | nt = MakePtr( PIMAGE_NT_HEADERS32, dos, dos->e_lfanew); |
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| 56 | |||
| 57 | if( (uint32_t)nt < (uint32_t)raw) |
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| 58 | return 0; |
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| 59 | |||
| 60 | if(nt->Signature != IMAGE_NT_SIGNATURE) |
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| 61 | return 0; |
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| 62 | |||
| 63 | if(nt->FileHeader.Machine != IMAGE_FILE_MACHINE_I386) |
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| 64 | return 0; |
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| 65 | |||
| 66 | if(nt->OptionalHeader.Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC) |
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| 67 | return 0; |
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| 68 | |||
| 69 | if(nt->OptionalHeader.SectionAlignment < 4096) |
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| 70 | { |
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| 71 | if(nt->OptionalHeader.FileAlignment != nt->OptionalHeader.SectionAlignment) |
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| 72 | return 0; |
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| 73 | } |
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| 74 | else if(nt->OptionalHeader.SectionAlignment < nt->OptionalHeader.FileAlignment) |
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| 75 | return 0; |
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| 76 | |||
| 77 | if(!IsPowerOf2(nt->OptionalHeader.SectionAlignment) || |
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| 78 | !IsPowerOf2(nt->OptionalHeader.FileAlignment)) |
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| 79 | return 0; |
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| 80 | |||
| 81 | if(nt->FileHeader.NumberOfSections > 96) |
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| 82 | return 0; |
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| 83 | |||
| 84 | return 1; |
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| 85 | } |
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| 86 | |||
| 87 | void* create_image(void *raw) |
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| 88 | { |
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| 89 | PIMAGE_DOS_HEADER dos; |
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| 90 | PIMAGE_NT_HEADERS32 nt; |
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| 91 | PIMAGE_SECTION_HEADER img_sec; |
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| 92 | |||
| 93 | void *img_base; |
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| 94 | uint32_t sec_align; |
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| 95 | int i; |
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| 96 | |||
| 97 | dos = (PIMAGE_DOS_HEADER)raw; |
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| 98 | nt = MakePtr( PIMAGE_NT_HEADERS32, dos, dos->e_lfanew); |
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| 99 | |||
| 9874 | turbocat | 100 | img_base = _ksys_alloc(nt->OptionalHeader.SizeOfImage); |
| 4349 | Serge | 101 | |
| 102 | if(unlikely(img_base == NULL)) |
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| 103 | return 0; |
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| 104 | |||
| 105 | sec_copy(img_base, raw, nt->OptionalHeader.SizeOfHeaders); |
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| 106 | |||
| 107 | img_sec = MakePtr(PIMAGE_SECTION_HEADER, nt, sizeof(IMAGE_NT_HEADERS32)); |
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| 108 | |||
| 109 | sec_align = nt->OptionalHeader.SectionAlignment; |
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| 110 | |||
| 111 | for(i=0; i< nt->FileHeader.NumberOfSections; i++) |
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| 112 | { |
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| 113 | void *src_ptr; |
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| 114 | void *dest_ptr; |
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| 115 | size_t sec_size; |
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| 116 | |||
| 117 | if ( img_sec->SizeOfRawData && img_sec->PointerToRawData ) |
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| 118 | { |
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| 119 | src_ptr = MakePtr(void*, raw, img_sec->PointerToRawData); |
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| 120 | dest_ptr = MakePtr(void*, img_base, img_sec->VirtualAddress); |
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| 121 | sec_copy(dest_ptr, src_ptr, img_sec->SizeOfRawData); |
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| 122 | }; |
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| 123 | |||
| 124 | img_sec++; |
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| 125 | }; |
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| 126 | |||
| 127 | if(nt->OptionalHeader.DataDirectory[5].Size) |
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| 128 | { |
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| 129 | PIMAGE_BASE_RELOCATION reloc; |
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| 130 | |||
| 131 | uint32_t delta = (uint32_t)img_base - nt->OptionalHeader.ImageBase; |
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| 132 | |||
| 133 | reloc = MakePtr(PIMAGE_BASE_RELOCATION, img_base, |
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| 134 | nt->OptionalHeader.DataDirectory[5].VirtualAddress); |
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| 135 | |||
| 136 | while ( reloc->SizeOfBlock != 0 ) |
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| 137 | { |
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| 138 | uint32_t cnt; |
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| 139 | uint16_t *entry; |
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| 140 | uint16_t reltype; |
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| 141 | uint32_t offs; |
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| 142 | |||
| 143 | cnt = (reloc->SizeOfBlock - sizeof(*reloc))/sizeof(uint16_t); |
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| 144 | entry = MakePtr( uint16_t*, reloc, sizeof(*reloc) ); |
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| 145 | |||
| 146 | for ( i=0; i < cnt; i++ ) |
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| 147 | { |
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| 148 | uint16_t *p16; |
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| 149 | uint32_t *p32; |
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| 150 | |||
| 151 | reltype = (*entry & 0xF000) >> 12; |
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| 152 | offs = (*entry & 0x0FFF) + reloc->VirtualAddress; |
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| 153 | switch(reltype) |
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| 154 | { |
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| 155 | case 1: |
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| 156 | p16 = MakePtr(uint16_t*, img_base, offs); |
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| 157 | *p16+= (uint16_t)(delta>>16); |
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| 158 | break; |
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| 159 | case 2: |
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| 160 | p16 = MakePtr(uint16_t*, img_base, offs); |
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| 161 | *p16+= (uint16_t)delta; |
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| 162 | break; |
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| 163 | case 3: |
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| 164 | p32 = MakePtr(uint32_t*, img_base, offs); |
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| 165 | *p32+= delta; |
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| 166 | } |
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| 167 | entry++; |
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| 168 | } |
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| 169 | reloc = MakePtr(PIMAGE_BASE_RELOCATION, reloc,reloc->SizeOfBlock); |
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| 170 | }; |
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| 171 | // printf("unmap base %p offset %x %d page(s)\n", |
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| 172 | // img_base, |
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| 173 | // nt->OptionalHeader.DataDirectory[5].VirtualAddress, |
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| 174 | // (nt->OptionalHeader.DataDirectory[5].Size+4095)>>12); |
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| 175 | |||
| 176 | user_unmap(img_base,nt->OptionalHeader.DataDirectory[5].VirtualAddress, |
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| 177 | nt->OptionalHeader.DataDirectory[5].Size); |
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| 178 | }; |
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| 179 | return img_base; |
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| 180 | }; |
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| 181 | |||
| 182 | void* get_entry_point(void *raw) |
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| 183 | { |
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| 184 | PIMAGE_DOS_HEADER dos; |
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| 185 | PIMAGE_NT_HEADERS32 nt; |
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| 186 | |||
| 187 | dos = (PIMAGE_DOS_HEADER)raw; |
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| 188 | nt = MakePtr( PIMAGE_NT_HEADERS32, dos, dos->e_lfanew); |
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| 189 | |||
| 190 | return MakePtr(void*, raw, nt->OptionalHeader.AddressOfEntryPoint); |
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| 191 | }; |
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| 192 | |||
| 193 | |||
| 194 | void* load_libc() |
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| 195 | { |
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| 196 | void *raw_img; |
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| 197 | size_t raw_size; |
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| 198 | void *img_base = NULL; |
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| 9874 | turbocat | 199 | ksys_ufile_t uf; |
| 4349 | Serge | 200 | |
| 9874 | turbocat | 201 | uf = _ksys_load_file("/kolibrios/lib/libc.dll"); |
| 4349 | Serge | 202 | |
| 203 | raw_img = uf.data; |
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| 204 | raw_size = uf.size; |
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| 205 | |||
| 206 | if(raw_img == NULL) |
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| 207 | return NULL; |
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| 208 | |||
| 209 | // printf("libc.dll raw %p, size %d\n", raw_img, raw_size); |
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| 210 | |||
| 211 | if(validate_pe(raw_img, raw_size) != 0) |
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| 212 | { |
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| 213 | // printf("invalide libc.dll\n"); |
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| 214 | img_base = create_image(raw_img); |
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| 215 | }; |
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| 216 | |||
| 9874 | turbocat | 217 | _ksys_free(raw_img); |
| 4349 | Serge | 218 | |
| 219 | return img_base; |
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| 220 | |||
| 221 | } |
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| 222 |