├── LICENSE ├── README.md ├── finders.c ├── functions.c ├── iBoot32Patcher.c ├── include ├── arm32_defs.h ├── finders.h ├── functions.h ├── iBoot32Patcher.h └── patchers.h └── patchers.c /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | iBoot32Patcher - A Universal 32-bit iBoot patcher for iPhone OS 2.0 --> iOS 10 2 | ---------------------------------------------------- 3 | Copyright 2013-2016, iH8sn0w. 4 | 5 | iBoot32Patcher is free software: you can redistribute it and/or modify 6 | it under the terms of the GNU General Public License as published by 7 | the Free Software Foundation, either version 3 of the License, or 8 | (at your option) any later version. 9 | 10 | iBoot32Patcher is distributed in the hope that it will be useful, 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 | GNU General Public License for more details. 14 | 15 | You should have received a copy of the GNU General Public License 16 | along with iBoot32Patcher. If not, see . 17 | 18 | Compiling 19 | --------------------------------------------------- 20 | clang iBoot32Patcher.c finders.c functions.c patchers.c -Wno-multichar -I. -o iBoot32Patcher 21 | 22 | Sample Usage 23 | --------------------------------------------------- 24 | iBoot32Patcher iBoot.n49.RELEASE.dfu.decrypted iBoot.n49.RELEASE.dfu.patched -b "cs_enforcement_disable=1" -c "ticket" 0x80000000 25 | 26 | Bugs 27 | --------------------------------------------------- 28 | Be sure to file a bug report under Github's Issues tab if you run into any. 29 | -------------------------------------------------------------------------------- /finders.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | #include 21 | #include 22 | #include 23 | #include 24 | #include 25 | 26 | void* find_bl_verify_shsh(struct iboot_img* iboot_in) { 27 | int os_vers = get_os_version(iboot_in); 28 | 29 | /* Use the os-specific method for finding BL verify_shsh... */ 30 | if(os_vers >= 5 && os_vers <= 7) { 31 | return find_bl_verify_shsh_5_6_7(iboot_in); 32 | } 33 | 34 | return find_bl_verify_shsh_generic(iboot_in); 35 | } 36 | 37 | void* find_bl_verify_shsh_5_6_7(struct iboot_img* iboot_in) { 38 | printf("%s: Entering...\n", __FUNCTION__); 39 | 40 | /* Find the MOVW Rx, #'RT' instruction... */ 41 | void* movw = find_next_MOVW_insn_with_value(iboot_in->buf, iboot_in->len, 'RT'); 42 | if(!movw) { 43 | printf("%s: Unable to find MOVW instruction!\n", __FUNCTION__); 44 | return 0; 45 | } 46 | 47 | printf("%s: Found MOVW instruction at %p\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, movw)); 48 | 49 | /* Resolve the BL verify_shsh routine from found instruction... */ 50 | void* bl_verify_shsh = find_bl_verify_shsh_insn(iboot_in, movw); 51 | if(!bl_verify_shsh) { 52 | printf("%s: Unable to find a BL verify_shsh! (Image may already be patched?)\n", __FUNCTION__); 53 | return 0; 54 | } 55 | 56 | printf("%s: Found BL verify_shsh at %p\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, bl_verify_shsh)); 57 | 58 | printf("%s: Leaving...\n", __FUNCTION__); 59 | 60 | return bl_verify_shsh; 61 | } 62 | 63 | void* find_bl_verify_shsh_generic(struct iboot_img* iboot_in) { 64 | printf("%s: Entering...\n", __FUNCTION__); 65 | 66 | /* Find the LDR Rx, ='CERT' instruction... */ 67 | void* ldr_insn = find_next_LDR_insn_with_value(iboot_in, 'CERT'); 68 | if(!ldr_insn) { 69 | printf("%s: Unable to find LDR insn!\n", __FUNCTION__); 70 | return 0; 71 | } 72 | 73 | printf("%s: Found LDR instruction at %p\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, ldr_insn)); 74 | 75 | /* Resolve the BL verify_shsh routine from found instruction... */ 76 | void* bl_verify_shsh = find_bl_verify_shsh_insn(iboot_in, ldr_insn); 77 | if(!bl_verify_shsh) { 78 | printf("%s: Unable to find a BL verify_shsh! (Image may already be patched?)\n", __FUNCTION__); 79 | return 0; 80 | } 81 | 82 | printf("%s: Found BL verify_shsh at %p\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, bl_verify_shsh)); 83 | 84 | printf("%s: Leaving...\n", __FUNCTION__); 85 | 86 | return bl_verify_shsh; 87 | } 88 | 89 | void* find_bl_verify_shsh_insn(struct iboot_img* iboot_in, void* pc) { 90 | /* Find the top of the function... */ 91 | void* function_top = find_verify_shsh_top(pc); 92 | if(!function_top) { 93 | printf("%s: Unable to find top of verify_shsh!\n", __FUNCTION__); 94 | return 0; 95 | } 96 | 97 | /* Find the BL insn resolving to this function... (BL verify_shsh seems to only happen once) */ 98 | void* bl_verify_shsh = find_next_bl_insn_to(iboot_in, (uint32_t) ((uintptr_t)GET_IBOOT_FILE_OFFSET(iboot_in, function_top))); 99 | if(!bl_verify_shsh) { 100 | return 0; 101 | } 102 | 103 | return bl_verify_shsh; 104 | } 105 | 106 | void* find_dtre_get_value_bl_insn(struct iboot_img* iboot_in, const char* var) { 107 | printf("%s: Entering...\n", __FUNCTION__); 108 | 109 | /* Find the variable string... */ 110 | void* var_str_loc = memstr(iboot_in->buf, iboot_in->len, var); 111 | if(!var_str_loc) { 112 | printf("%s: Unable to find %s string!\n", __FUNCTION__, var); 113 | return 0; 114 | } 115 | printf("%s: %s string is at %p\n", __FUNCTION__, var, (void*) GET_IBOOT_FILE_OFFSET(iboot_in, var_str_loc)); 116 | 117 | /* Find the variable string xref... */ 118 | void* var_xref = iboot_memmem(iboot_in, var_str_loc); 119 | if(!var_xref) { 120 | printf("%s: Unable to find %s string xref!\n", __FUNCTION__, var); 121 | return 0; 122 | } 123 | printf("%s: \"%s\" xref is at %p\n", __FUNCTION__, var, (void*) GET_IBOOT_FILE_OFFSET(iboot_in, var_xref)); 124 | 125 | /* Locate corresponding LDR insn for xref... */ 126 | void* var_ldr = ldr_to(var_xref); 127 | if(!var_ldr) { 128 | printf("%s: Unable to find %s string LDR from xref!\n", __FUNCTION__, var); 129 | return 0; 130 | } 131 | 132 | struct arm32_thumb_LDR* ldr_rd_debug_enabled = (struct arm32_thumb_LDR*) var_ldr; 133 | printf("%s: Found LDR R%d, =\"%s\" at %p\n", __FUNCTION__, ldr_rd_debug_enabled->rd, var, GET_IBOOT_FILE_OFFSET(iboot_in, var_ldr)); 134 | 135 | /* Find the BL insn that follows the LDR insn... (Usually BL does_dtre_have_var) */ 136 | void* is_in_dtre_bl = bl_search_down(var_ldr, 0x100); 137 | if(!is_in_dtre_bl) { 138 | printf("%s: Unable to find a BL following LDR insn.\n", __FUNCTION__); 139 | return 0; 140 | } 141 | is_in_dtre_bl++; 142 | 143 | /* Find the next BL insn after the previous BL insn... (Usually BL get_value_for_dtre_var) */ 144 | void* get_value_for_dtre_bl = bl_search_down(is_in_dtre_bl, 0x100); 145 | if(!get_value_for_dtre_bl) { 146 | printf("%s: Unable to find a BL following the previous BL.\n", __FUNCTION__); 147 | return 0; 148 | } 149 | 150 | printf("%s: Found BL instruction at %p\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, get_value_for_dtre_bl)); 151 | 152 | printf("%s: Leaving...\n", __FUNCTION__); 153 | 154 | return get_value_for_dtre_bl; 155 | } 156 | 157 | void* find_verify_shsh_top(void* ptr) { 158 | void* top = push_r4_r7_lr_search_up(ptr, 0x500); 159 | if(!top) { 160 | return 0; 161 | } 162 | top++; // Thumb 163 | return top; 164 | } 165 | 166 | -------------------------------------------------------------------------------- /functions.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | #include 21 | #include 22 | #include 23 | #include 24 | 25 | void* bl_search_down(const void* start_addr, int len) { 26 | return pattern_search(start_addr, len, 0xD000F000, 0xD000F800, 1); 27 | } 28 | 29 | void* find_last_LDR_rd(uintptr_t start, size_t len, const uint8_t rd) { 30 | for(uintptr_t i = start; i > 0; i -= sizeof(uint16_t)) { 31 | void* prev_ldr = pattern_search((void*) i, len, 0x00004800, 0x0000F800, -2); 32 | struct arm32_thumb_LDR* ldr = (struct arm32_thumb_LDR*) prev_ldr; 33 | 34 | if(ldr == NULL) { 35 | break; 36 | } else if(ldr->rd == rd) { 37 | return (void*) prev_ldr; 38 | } 39 | i = ((uintptr_t) prev_ldr - sizeof(uint16_t)); 40 | } 41 | return NULL; 42 | } 43 | 44 | void* find_next_bl_insn_to(struct iboot_img* iboot_in, uint32_t addr) { 45 | for(int i = 0; i < iboot_in->len - sizeof(uint32_t); i++) { 46 | void* possible_bl = resolve_bl32(iboot_in->buf + i); 47 | uint32_t resolved = (uintptr_t) GET_IBOOT_FILE_OFFSET(iboot_in, possible_bl); 48 | if(resolved == addr) { 49 | return (void*) (iboot_in->buf + i); 50 | } 51 | } 52 | return NULL; 53 | } 54 | 55 | void* find_next_CMP_insn_with_value(void* start, size_t len, const uint8_t val) { 56 | for(int i = 0; i < len; i += sizeof(uint16_t)) { 57 | struct arm32_thumb* insn = (struct arm32_thumb*) (start + i); 58 | if(insn->op == ARM32_THUMB_CMP && insn->offset == val) { 59 | return (void*) insn; 60 | } 61 | } 62 | return NULL; 63 | } 64 | 65 | void* find_next_LDR_insn_with_value(struct iboot_img* iboot_in, uint32_t value) { 66 | void* ldr_xref = (void*) memmem(iboot_in->buf, iboot_in->len, &value, sizeof(value)); 67 | if(!ldr_xref) { 68 | printf("%s: Unable to find an LDR xref for 0x%X!\n", __FUNCTION__, value); 69 | return 0; 70 | } 71 | void* ldr_insn = ldr_to(ldr_xref); 72 | if(!ldr_insn) { 73 | printf("%s: Unable to resolve to LDR insn from xref %p!\n", __FUNCTION__, ldr_xref); 74 | return 0; 75 | } 76 | return ldr_insn; 77 | } 78 | 79 | void* find_next_MOVW_insn_with_value(void* start, size_t len, const uint16_t val) { 80 | for(int i = 0; i < len; i += sizeof(uint16_t)) { 81 | struct arm32_thumb_MOVW* candidate = (struct arm32_thumb_MOVW*) (start + i); 82 | if(is_MOVW_insn(start + i) && get_MOVW_val(candidate) == val) { 83 | return (void*) candidate; 84 | } 85 | } 86 | return NULL; 87 | } 88 | 89 | uint32_t get_iboot_base_address(void* iboot_buf) { 90 | if(iboot_buf) { 91 | return *(uint32_t*)(iboot_buf + 0x20) & ~0xFFFFF; 92 | } 93 | return 0; 94 | } 95 | 96 | int get_os_version(struct iboot_img* iboot_in) { 97 | for(int i = 0; i < sizeof(iboot_intervals)/sizeof(struct iboot_interval); i++) { 98 | if(iboot_in->VERS >= iboot_intervals[i].low && iboot_in->VERS <= iboot_intervals[i].high) { 99 | return iboot_intervals[i].os; 100 | } 101 | } 102 | return 0; 103 | } 104 | 105 | uint16_t get_MOVW_val(struct arm32_thumb_MOVW* movw) { 106 | return (uint16_t) (((movw->imm4 << 4) + (movw->i << 3) + movw->imm3) << 8) + movw->imm8; 107 | } 108 | 109 | uint16_t get_MOVT_W_val(struct arm32_thumb_MOVT_W* movt_w) { 110 | return get_MOVW_val((struct arm32_thumb_MOVW*) movt_w); 111 | } 112 | 113 | bool has_kernel_load(struct iboot_img* iboot_in) { 114 | void* debug_enabled_str = memstr(iboot_in->buf, iboot_in->len, KERNELCACHE_PREP_STRING); 115 | 116 | return (bool) (debug_enabled_str != NULL); 117 | } 118 | 119 | bool has_recovery_console(struct iboot_img* iboot_in) { 120 | void* entering_recovery_str = memstr(iboot_in->buf, iboot_in->len, ENTERING_RECOVERY_CONSOLE); 121 | 122 | return (bool) (entering_recovery_str != NULL); 123 | } 124 | 125 | void* iboot_memmem(struct iboot_img* iboot_in, void* pat) { 126 | uint32_t new_pat = (uintptr_t) GET_IBOOT_ADDR(iboot_in, pat); 127 | 128 | return (void*) memmem(iboot_in->buf, iboot_in->len, &new_pat, sizeof(uint32_t)); 129 | } 130 | 131 | bool is_BW_insn(void* offset) { 132 | struct arm32_thumb_BW_T4* bw = (struct arm32_thumb_BW_T4*) offset; 133 | uintptr_t ptr = (uintptr_t) offset; 134 | if(bw->pad0 == 0x1E && bw->pad1 == 2 && bw->bit12 == 1 && (ptr & 1)) { 135 | return true; 136 | } 137 | return false; 138 | } 139 | 140 | bool is_LDRW_insn(void* offset) { 141 | struct arm32_thumb_LDR_T3* test = (struct arm32_thumb_LDR_T3*) offset; 142 | if(test->pad == 0xF8D) { 143 | return true; 144 | } 145 | return false; 146 | } 147 | 148 | bool is_MOVT_W_insn(void* offset) { 149 | struct arm32_thumb_MOVT_W* test = (struct arm32_thumb_MOVT_W*) offset; 150 | if(test->pad0 == 0x2C && test->pad1 == 0x1E && test->bit31 == 0) { 151 | return true; 152 | } 153 | return false; 154 | } 155 | 156 | bool is_MOVW_insn(void* offset) { 157 | struct arm32_thumb_MOVW* test = (struct arm32_thumb_MOVW*) offset; 158 | if(test->pad0 == 0x24 && test->pad1 == 0x1E && test->bit31 == 0) { 159 | return true; 160 | } 161 | return false; 162 | } 163 | 164 | bool is_IT_insn(void* offset) { 165 | struct arm32_thumb_IT_T1* it = (struct arm32_thumb_IT_T1*) offset; 166 | if(it->pad == 0xBF) { 167 | return true; 168 | } 169 | return false; 170 | } 171 | 172 | void* ldr_search_up(const void* start_addr, int len) { 173 | return pattern_search(start_addr, len, 0x00004800, 0x0000F800, -1); 174 | } 175 | 176 | void* ldr32_search_up(const void* start_addr, int len) { 177 | return pattern_search(start_addr, len, 0x0000F8DF, 0x0000FFFF, -1); 178 | } 179 | 180 | void* ldr_to(const void* loc) { 181 | uintptr_t xref_target = (uintptr_t)loc; 182 | uintptr_t i = xref_target; 183 | uintptr_t min_addr = xref_target - 0x420; 184 | for(; i > min_addr; i -= 2) { 185 | i = (uintptr_t)ldr_search_up((void*)i, i - min_addr); 186 | if (i == 0) { 187 | break; 188 | } 189 | 190 | uint32_t dw = *(uint32_t*)i; 191 | uintptr_t ldr_target = ((i + 4) & ~3) + ((dw & 0xff) << 2); 192 | if (ldr_target == xref_target) { 193 | return (void*)i; 194 | } 195 | } 196 | 197 | min_addr = xref_target - 0x1000; 198 | for(i = xref_target; i > min_addr; i -= 4) { 199 | i = (uintptr_t)ldr32_search_up((void*)i, i - min_addr); 200 | if (i == 0) { 201 | break; 202 | } 203 | uint32_t dw = *(uint32_t*)i; 204 | uintptr_t ldr_target = ((i + 4) & ~3) + ((dw >> 16) & 0xfff); 205 | if (ldr_target == xref_target) { 206 | return (void*)i; 207 | } 208 | } 209 | return NULL; 210 | } 211 | 212 | void* _memmem(const void* mem, int size, const void* pat, int size2) { 213 | char* cmem = (char*)mem; 214 | const char* cpat = (const char*)pat; 215 | for (int i = 0; i < size; i++) { 216 | for (int j = 0; j < size2; ++j) { 217 | if (cmem[i + j] != cpat[j]) 218 | goto next; 219 | } 220 | return (void*)(cmem + i); 221 | next: 222 | continue; 223 | } 224 | return NULL; 225 | } 226 | 227 | void* memstr(const void* mem, size_t size, const char* str) { 228 | return (void*) memmem(mem, size, str, strlen(str)); 229 | } 230 | 231 | void* pattern_search(const void* addr, int len, int pattern, int mask, int step) { 232 | char* caddr = (char*)addr; 233 | if (len <= 0) 234 | return NULL; 235 | if (step < 0) { 236 | len = -len; 237 | len &= ~-(step+1); 238 | } else { 239 | len &= ~(step-1); 240 | } 241 | for (int i = 0; i != len; i += step) { 242 | uint32_t x = *(uint32_t*)(caddr + i); 243 | if ((x & mask) == pattern) 244 | return (void*)(caddr + i); 245 | } 246 | return NULL; 247 | } 248 | 249 | void* push_r4_r7_lr_search_up(const void* start_addr, int len) { 250 | // F0 B5 251 | return pattern_search(start_addr, len, 0x0000B5F0, 0x0000FFFF, -2); 252 | } 253 | 254 | /* Taken from saurik's substrate framework. (See Hooker.cpp) */ 255 | void* resolve_bl32(const void* bl) { 256 | union { 257 | uint16_t value; 258 | 259 | struct { 260 | uint16_t immediate : 10; 261 | uint16_t s : 1; 262 | uint16_t : 5; 263 | }; 264 | } bits = {*(uint16_t*)bl}; 265 | 266 | union { 267 | uint16_t value; 268 | 269 | struct { 270 | uint16_t immediate : 11; 271 | uint16_t j2 : 1; 272 | uint16_t x : 1; 273 | uint16_t j1 : 1; 274 | uint16_t : 2; 275 | }; 276 | } exts = {((uint16_t*)bl)[1]}; 277 | 278 | int32_t jump = 0; 279 | jump |= bits.s << 24; 280 | jump |= (~(bits.s ^ exts.j1) & 0x1) << 23; 281 | jump |= (~(bits.s ^ exts.j2) & 0x1) << 22; 282 | jump |= bits.immediate << 12; 283 | jump |= exts.immediate << 1; 284 | jump |= exts.x; 285 | jump <<= 7; 286 | jump >>= 7; 287 | 288 | return (void*) (bl + 4 + jump); 289 | } 290 | 291 | void set_MOVT_W_insn_val(void* offset, uint8_t rd, uint16_t val) { 292 | struct arm32_thumb_MOVT_W* movt_w = (struct arm32_thumb_MOVT_W*) offset; 293 | memset(movt_w, 0, sizeof(struct arm32_thumb_MOVT_W)); 294 | 295 | movt_w->pad0 = 0x2C; 296 | movt_w->pad1 = 0x1E; 297 | movt_w->rd = rd; 298 | movt_w->imm4 = (val >> 12); 299 | val &= ~(movt_w->imm4 << 12); 300 | movt_w->imm3 = (val >> 8); 301 | val &= ~(movt_w->imm3 << 8); 302 | movt_w->imm8 = val; 303 | 304 | if(get_MOVT_W_val(movt_w) != val) { 305 | movt_w->i = 1; 306 | } 307 | } 308 | 309 | void set_MOVW_insn_val(void* offset, uint8_t rd, uint16_t val) { 310 | struct arm32_thumb_MOVW* movw = (struct arm32_thumb_MOVW*) offset; 311 | memset(movw, 0, sizeof(struct arm32_thumb_MOVW)); 312 | 313 | movw->pad0 = 0x24; 314 | movw->pad1 = 0x1E; 315 | movw->rd = rd; 316 | movw->imm4 = (val >> 12); 317 | val &= ~(movw->imm4 << 12); 318 | movw->imm3 = (val >> 8); 319 | val &= ~(movw->imm3 << 8); 320 | movw->imm8 = val; 321 | 322 | if(get_MOVW_val(movw) != val) { 323 | movw->i = 1; 324 | } 325 | } 326 | -------------------------------------------------------------------------------- /iBoot32Patcher.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | /* iBoot32Patcher 21 | * 22 | * Universal 32-bit iBoot patcher for iPhone OS 2.0 --> iOS 10 23 | * 24 | * Build: 25 | * clang iBoot32Patcher.c finders.c functions.c patchers.c -Wno-multichar -I. -o iBoot32Patcher 26 | * 27 | * Usage: 28 | * ./iBoot32Patcher iBoot.n49.RELEASE.dfu.decrypted iBoot.n49.RELEASE.dfu.patched 29 | * ./iBoot32Patcher iBoot.n49.RELEASE.dfu.decrypted iBoot.n49.RELEASE.dfu.patched -b "cs_enforcement_disable=1 -v" 30 | * ./iBoot32Patcher iBoot.n49.RELEASE.dfu.decrypted iBoot.n49.RELEASE.dfu.patched -b "cs_enforcement_disable=1" -c "ticket" 0x80000000 31 | * ./iBoot32Patcher iBoot.n49.RELEASE.dfu.decrypted iBoot.n49.RELEASE.dfu.patched -c "ticket" 0x80000000 32 | * 33 | */ 34 | 35 | #include 36 | #include 37 | #include 38 | #include 39 | 40 | #include 41 | #include 42 | #include 43 | #include 44 | #include 45 | 46 | #define HAS_ARG(x,y) (!strcmp(argv[i], x) && (i + y) < argc) 47 | 48 | int main(int argc, char** argv) { 49 | int ret = 0; 50 | FILE* fp = NULL; 51 | uint32_t cmd_handler_ptr = 0; 52 | char* cmd_handler_str = NULL; 53 | char* custom_boot_args = NULL; 54 | struct iboot_img iboot_in; 55 | 56 | memset(&iboot_in, 0, sizeof(iboot_in)); 57 | 58 | if(argc < 3) { 59 | printf("Usage: %s [args]\n", argv[0]); 60 | printf("\t-b \tApply custom boot args.\n"); 61 | printf("\t-c \tChange a command handler's pointer (hex).\n"); 62 | return -1; 63 | } 64 | 65 | printf("%s: Starting...\n", __FUNCTION__); 66 | 67 | for(int i = 0; i < argc; i++) { 68 | if(HAS_ARG("-b", 1)) { 69 | custom_boot_args = (char*) argv[i+1]; 70 | } else if(HAS_ARG("-c", 2)) { 71 | cmd_handler_str = (char*) argv[i+1]; 72 | sscanf((char*) argv[i+2], "0x%08X", &cmd_handler_ptr); 73 | } 74 | } 75 | 76 | fp = fopen(argv[1], "rb"); 77 | if(!fp) { 78 | printf("%s: Error opening %s!\n", __FUNCTION__, argv[1]); 79 | return -1; 80 | } 81 | 82 | fseek(fp, 0, SEEK_END); 83 | iboot_in.len = ftell(fp); 84 | fseek(fp, 0, SEEK_SET); 85 | 86 | iboot_in.buf = (void*)malloc(iboot_in.len); 87 | if(!iboot_in.buf) { 88 | printf("%s: Out of memory!\n", __FUNCTION__); 89 | fclose(fp); 90 | return -1; 91 | } 92 | 93 | fread(iboot_in.buf, 1, iboot_in.len, fp); 94 | fclose(fp); 95 | 96 | uint32_t image_magic = *(uint32_t*)iboot_in.buf; 97 | 98 | if(image_magic == IMAGE3_MAGIC) { 99 | printf("%s: The supplied image appears to be in an img3 container. Please ensure that the image is decrypted and that the img3 header is stripped.\n", __FUNCTION__); 100 | free(iboot_in.buf); 101 | return -1; 102 | } 103 | 104 | if(image_magic != IBOOT32_RESET_VECTOR_BYTES) { 105 | printf("%s: The supplied image is not a valid 32-bit iBoot.\n", __FUNCTION__); 106 | free(iboot_in.buf); 107 | return -1; 108 | } 109 | 110 | const char* iboot_vers_str = (iboot_in.buf + IBOOT_VERS_STR_OFFSET); 111 | 112 | iboot_in.VERS = atoi(iboot_vers_str); 113 | if(!iboot_in.VERS) { 114 | printf("%s: No iBoot version found!\n", __FUNCTION__); 115 | free(iboot_in.buf); 116 | return -1; 117 | } 118 | 119 | printf("%s: iBoot-%d inputted.\n", __FUNCTION__, iboot_in.VERS); 120 | 121 | /* Check to see if the loader has a kernel load routine before trying to apply custom boot args + debug-enabled override. */ 122 | if(has_kernel_load(&iboot_in)) { 123 | if(custom_boot_args) { 124 | ret = patch_boot_args(&iboot_in, custom_boot_args); 125 | if(!ret) { 126 | printf("%s: Error doing patch_boot_args()!\n", __FUNCTION__); 127 | free(iboot_in.buf); 128 | return -1; 129 | } 130 | } 131 | 132 | /* Only bootloaders with the kernel load routines pass the DeviceTree. */ 133 | ret = patch_debug_enabled(&iboot_in); 134 | if(!ret) { 135 | printf("%s: Error doing patch_debug_enabled()!\n", __FUNCTION__); 136 | free(iboot_in.buf); 137 | return -1; 138 | } 139 | } 140 | 141 | /* Ensure that the loader has a shell. */ 142 | if(has_recovery_console(&iboot_in) && cmd_handler_str) { 143 | ret = patch_cmd_handler(&iboot_in, cmd_handler_str, cmd_handler_ptr); 144 | if(!ret) { 145 | printf("%s: Error doing patch_cmd_handler()!\n", __FUNCTION__); 146 | free(iboot_in.buf); 147 | return -1; 148 | } 149 | } 150 | 151 | /* All loaders have the RSA check. */ 152 | ret = patch_rsa_check(&iboot_in); 153 | if(!ret) { 154 | printf("%s: Error doing patch_rsa_check()!\n", __FUNCTION__); 155 | free(iboot_in.buf); 156 | return -1; 157 | } 158 | 159 | printf("%s: Writing out patched file to %s...\n", __FUNCTION__, argv[2]); 160 | 161 | /* Write out the patched file... */ 162 | fp = fopen(argv[2], "wb+"); 163 | if(!fp) { 164 | printf("%s: Unable to open %s!\n", __FUNCTION__, argv[2]); 165 | free(iboot_in.buf); 166 | return -1; 167 | } 168 | 169 | fwrite(iboot_in.buf, 1, iboot_in.len, fp); 170 | fflush(fp); 171 | fclose(fp); 172 | 173 | free(iboot_in.buf); 174 | 175 | printf("%s: Quitting...\n", __FUNCTION__); 176 | return 0; 177 | } 178 | -------------------------------------------------------------------------------- /include/arm32_defs.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | #ifndef ARM_DEFS_H 21 | #define ARM_DEFS_H 22 | 23 | #define ARM32_THUMB_MOV 0 24 | #define ARM32_THUMB_CMP 1 25 | #define ARM32_THUMB_ADD 2 26 | #define ARM32_THUMB_SUB 3 27 | 28 | #define ARM32_THUMB_IT_NE __builtin_bswap16(0x18BF) 29 | #define ARM32_THUMB_IT_EQ __builtin_bswap16(0x08BF) 30 | 31 | struct arm32_thumb_LDR_T3 { 32 | uint8_t rn : 4; 33 | uint16_t pad : 12; 34 | uint16_t imm12 : 12; 35 | uint8_t rt : 4; 36 | } __attribute__ ((packed)); 37 | 38 | struct arm32_thumb_MOVW { 39 | uint8_t imm4 : 4; 40 | uint8_t pad0 : 6; 41 | uint8_t i : 1; 42 | uint8_t pad1 : 5; 43 | uint8_t imm8; 44 | uint8_t rd : 4; 45 | uint8_t imm3 : 3; 46 | uint8_t bit31 : 1; 47 | } __attribute__((packed)); 48 | 49 | struct arm32_thumb_MOVT_W { 50 | uint8_t imm4 : 4; 51 | uint8_t pad0 : 6; 52 | uint8_t i : 1; 53 | uint8_t pad1 : 5; 54 | uint8_t imm8; 55 | uint8_t rd : 4; 56 | uint8_t imm3 : 3; 57 | uint8_t bit31 : 1; 58 | } __attribute__((packed)); 59 | 60 | struct arm32_thumb_BW_T4 { 61 | uint16_t imm10 : 10; 62 | uint8_t s : 1; 63 | uint8_t pad0 : 5; 64 | uint16_t imm11 : 11; 65 | uint8_t j2 : 1; 66 | uint8_t bit12 : 1; 67 | uint8_t j1 : 1; 68 | uint8_t pad1 : 2; 69 | } __attribute__((packed)); 70 | 71 | struct arm32_thumb_IT_T1 { 72 | uint8_t mask : 4; 73 | uint8_t cond : 4; 74 | uint8_t pad : 8; 75 | }__attribute__((packed)); 76 | 77 | struct arm32_thumb_LDR { 78 | uint8_t imm8; 79 | uint8_t rd : 3; 80 | uint8_t padd : 5; 81 | } __attribute__((packed)); 82 | 83 | struct arm32_thumb_hi_reg_op { 84 | uint8_t rd : 3; 85 | uint8_t rs : 3; 86 | uint8_t h2 : 1; 87 | uint8_t h1 : 1; 88 | uint8_t op : 2; 89 | uint8_t pad : 6; 90 | } __attribute__((packed)); 91 | 92 | struct arm32_thumb { 93 | uint8_t offset : 8; 94 | uint8_t rd : 3; 95 | uint8_t op : 2; 96 | uint8_t one : 1; 97 | uint8_t z: 1; 98 | uint8_t zero : 1; 99 | } __attribute__((packed)); 100 | 101 | #endif 102 | -------------------------------------------------------------------------------- /include/finders.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | #ifndef FINDERS_H 21 | #define FINDERS_H 22 | 23 | #include 24 | 25 | void* find_bl_verify_shsh(struct iboot_img* iboot_in); 26 | void* find_bl_verify_shsh_5_6_7(struct iboot_img* iboot_in); 27 | void* find_bl_verify_shsh_generic(struct iboot_img* iboot_in); 28 | void* find_bl_verify_shsh_insn(struct iboot_img* iboot_in, void* pc); 29 | void* find_dtre_get_value_bl_insn(struct iboot_img* iboot_in, const char* var); 30 | void* find_verify_shsh_top(void* ptr); 31 | 32 | #endif 33 | -------------------------------------------------------------------------------- /include/functions.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | #ifndef FUNCTIONS_H 21 | #define FUNCTIONS_H 22 | 23 | #include 24 | #include 25 | 26 | #define ENTERING_RECOVERY_CONSOLE "Entering recovery mode, starting command prompt" 27 | #define KERNELCACHE_PREP_STRING "__PAGEZERO" 28 | 29 | #ifndef memmem 30 | #define memmem _memmem 31 | void* _memmem(const void* mem, int size, const void* pat, int size2); 32 | #endif 33 | 34 | void* bl_search_down(const void* start_addr, int len); 35 | void* iboot_memmem(struct iboot_img* iboot_in, void* pat); 36 | void* find_last_LDR_rd(uintptr_t start, size_t len, const uint8_t rd); 37 | void* find_next_bl_insn_to(struct iboot_img* iboot_in, uint32_t addr); 38 | void* find_next_CMP_insn_with_value(void* start, size_t len, const uint8_t val); 39 | void* find_next_LDR_insn_with_value(struct iboot_img* iboot_in, uint32_t value); 40 | void* find_next_MOVW_insn_with_value(void* start, size_t len, const uint16_t val); 41 | uint32_t get_iboot_base_address(void* iboot_buf); 42 | uint16_t get_MOVT_W_val(struct arm32_thumb_MOVT_W* movt_w); 43 | uint16_t get_MOVW_val(struct arm32_thumb_MOVW* movw); 44 | int get_os_version(struct iboot_img* iboot_in); 45 | bool has_kernel_load(struct iboot_img* iboot_in); 46 | bool has_recovery_console(struct iboot_img* iboot_in); 47 | bool is_BW_insn(void* offset); 48 | bool is_LDRW_insn(void* offset); 49 | bool is_MOVW_insn(void* offset); 50 | bool is_IT_insn(void* offset); 51 | void* ldr_search_up(const void* start_addr, int len); 52 | void* ldr32_search_up(const void* start_addr, int len); 53 | void* ldr_to(const void* loc); 54 | void* memstr(const void* mem, size_t size, const char* str); 55 | void* pattern_search(const void* addr, int len, int pattern, int mask, int step); 56 | void* push_r4_r7_lr_search_up(const void* start_addr, int len); 57 | void* resolve_bl32(const void* bl); 58 | void set_MOVT_W_insn_val(void* offset, uint8_t rd, uint16_t val); 59 | void set_MOVW_insn_val(void* offset, uint8_t rd, uint16_t val); 60 | 61 | #endif 62 | -------------------------------------------------------------------------------- /include/iBoot32Patcher.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | #ifndef IBOOT32PATCHER_H 21 | #define IBOOT32PATCHER_H 22 | 23 | #include 24 | #include 25 | #include 26 | 27 | #define bswap32 __builtin_bswap32 28 | #define bswap16 __builtin_bswap16 29 | 30 | #define GET_IBOOT_FILE_OFFSET(iboot_in, x) (x - (uintptr_t) iboot_in->buf) 31 | #define GET_IBOOT_ADDR(iboot_in, x) (x - (uintptr_t) iboot_in->buf) + get_iboot_base_address(iboot_in->buf) 32 | 33 | #define IMAGE3_MAGIC 'Img3' 34 | #define IBOOT_VERS_STR_OFFSET 0x286 35 | #define IBOOT32_RESET_VECTOR_BYTES bswap32(0x0E0000EA) 36 | 37 | struct iboot_img { 38 | void* buf; 39 | size_t len; 40 | uint32_t VERS; 41 | } __attribute__((packed)); 42 | 43 | struct iboot32_cmd_t { 44 | uint32_t cmd_str_ptr; 45 | uint32_t cmd_ptr; 46 | uint32_t cmd_desc_str_ptr; 47 | } __attribute__((packed)); 48 | 49 | struct iboot64_cmd_t { 50 | uintptr_t cmd_str_ptr; 51 | uintptr_t cmd_ptr; 52 | uintptr_t cmd_desc_str_ptr; 53 | } __attribute__((packed)); 54 | 55 | struct iboot_interval { 56 | int low, high, os; 57 | } __attribute__((packed)); 58 | 59 | const static struct iboot_interval iboot_intervals[] = { 60 | {320, 590, 2}, 61 | {594, 817, 3}, 62 | {889, 1072, 4}, 63 | {1218, 1220, 5}, 64 | {1537, 1537, 6}, 65 | {1940, 1940, 7}, 66 | {2261, 2261, 8}, 67 | {2817, 2817, 9}, 68 | {3393, 3393, 10}, 69 | }; 70 | 71 | uint32_t get_iboot_base_address(void* iboot_buf); 72 | 73 | #endif 74 | -------------------------------------------------------------------------------- /include/patchers.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | #ifndef PATCHERS_H 21 | #define PATCHERS_H 22 | 23 | #include 24 | 25 | #define DEBUG_ENABLED_DTRE_VAR_STR "debug-enabled" 26 | #define DEFAULT_BOOTARGS_STR "rd=md0 nand-enable-reformat=1 -progress" 27 | #define RELIANCE_CERT_STR "Reliance on this certificate" 28 | 29 | int patch_boot_args(struct iboot_img* iboot_in, const char* boot_args); 30 | int patch_cmd_handler(struct iboot_img* iboot_in, const char* cmd_str, uint32_t ptr); 31 | int patch_debug_enabled(struct iboot_img* iboot_in); 32 | int patch_rsa_check(struct iboot_img* iboot_in); 33 | 34 | #endif 35 | -------------------------------------------------------------------------------- /patchers.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2013-2016, iH8sn0w. 3 | * 4 | * This file is part of iBoot32Patcher. 5 | * 6 | * iBoot32Patcher is free software: you can redistribute it and/or modify 7 | * it under the terms of the GNU General Public License as published by 8 | * the Free Software Foundation, either version 3 of the License, or 9 | * (at your option) any later version. 10 | * 11 | * iBoot32Patcher is distributed in the hope that it will be useful, 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | * GNU General Public License for more details. 15 | * 16 | * You should have received a copy of the GNU General Public License 17 | * along with iBoot32Patcher. If not, see . 18 | */ 19 | 20 | #include 21 | #include 22 | #include 23 | #include 24 | #include 25 | #include 26 | 27 | int patch_boot_args(struct iboot_img* iboot_in, const char* boot_args) { 28 | printf("%s: Entering...\n", __FUNCTION__); 29 | 30 | /* Find the pre-defined boot-args from iBoot "rd=md0 ..." */ 31 | void* default_boot_args_str_loc = memstr(iboot_in->buf, iboot_in->len, DEFAULT_BOOTARGS_STR); 32 | if(!default_boot_args_str_loc) { 33 | printf("%s: Unable to find default boot-args string!\n", __FUNCTION__); 34 | return 0; 35 | } 36 | printf("%s: Default boot-args string is at %p\n", __FUNCTION__, (void*) GET_IBOOT_FILE_OFFSET(iboot_in, default_boot_args_str_loc)); 37 | 38 | /* Find the boot-args string xref within the kernel load routine. */ 39 | void* default_boot_args_xref = iboot_memmem(iboot_in, default_boot_args_str_loc); 40 | if(!default_boot_args_xref) { 41 | printf("%s: Unable to find default boot-args string xref!\n", __FUNCTION__); 42 | return 0; 43 | } 44 | printf("%s: boot-args xref is at %p\n", __FUNCTION__, (void*) GET_IBOOT_FILE_OFFSET(iboot_in, default_boot_args_xref)); 45 | 46 | /* If new boot-args length exceeds the pre-defined one in iBoot, we need to point the xref somewhere else... */ 47 | if(strlen(boot_args) > strlen(DEFAULT_BOOTARGS_STR)) { 48 | printf("%s: Relocating boot-args string...\n", __FUNCTION__); 49 | 50 | /* Find the "Reliance on this cert..." string. */ 51 | char* reliance_cert_str_loc = (char*) memstr(iboot_in->buf, iboot_in->len, RELIANCE_CERT_STR); 52 | if(!reliance_cert_str_loc) { 53 | printf("%s: Unable to find \"%s\" string!\n", __FUNCTION__, RELIANCE_CERT_STR); 54 | return 0; 55 | } 56 | printf("%s: \"%s\" string found at %p\n", __FUNCTION__, RELIANCE_CERT_STR, GET_IBOOT_FILE_OFFSET(iboot_in, reliance_cert_str_loc)); 57 | 58 | /* Point the boot-args xref to the "Reliance on this cert..." string. */ 59 | printf("%s: Pointing default boot-args xref to %p...\n", __FUNCTION__, GET_IBOOT_ADDR(iboot_in, reliance_cert_str_loc)); 60 | *(uint32_t*)default_boot_args_xref = (uintptr_t) GET_IBOOT_ADDR(iboot_in, reliance_cert_str_loc); 61 | 62 | default_boot_args_str_loc = reliance_cert_str_loc; 63 | } 64 | printf("%s: Applying custom boot-args \"%s\"\n", __FUNCTION__, boot_args); 65 | strcpy(default_boot_args_str_loc, boot_args); 66 | 67 | /* This is where things get tricky... (Might run into issues on older loaders)*/ 68 | 69 | /* Patch out the conditional branches... */ 70 | void* _ldr_rd_boot_args = ldr_to(default_boot_args_xref); 71 | if(!_ldr_rd_boot_args) { 72 | uintptr_t default_boot_args_str_loc_with_base = (uintptr_t) GET_IBOOT_FILE_OFFSET(iboot_in, default_boot_args_str_loc) + get_iboot_base_address(iboot_in->buf); 73 | 74 | _ldr_rd_boot_args = find_next_LDR_insn_with_value(iboot_in, (uint32_t) default_boot_args_str_loc_with_base); 75 | if(!_ldr_rd_boot_args) { 76 | printf("%s: Error locating LDR Rx, =boot_args!\n", __FUNCTION__); 77 | return 0; 78 | } 79 | } 80 | 81 | struct arm32_thumb_LDR* ldr_rd_boot_args = (struct arm32_thumb_LDR*) _ldr_rd_boot_args; 82 | printf("%s: Found LDR R%d, =boot_args at %p\n", __FUNCTION__, ldr_rd_boot_args->rd, GET_IBOOT_FILE_OFFSET(iboot_in, _ldr_rd_boot_args)); 83 | 84 | /* Find next CMP Rd, #0 instruction... */ 85 | void* _cmp_insn = find_next_CMP_insn_with_value(ldr_rd_boot_args, 0x100, 0); 86 | if(!_cmp_insn) { 87 | printf("%s: Error locating next CMP instruction!\n", __FUNCTION__); 88 | return 0; 89 | } 90 | 91 | struct arm32_thumb* cmp_insn = (struct arm32_thumb*) _cmp_insn; 92 | void* arm32_thumb_IT_insn = _cmp_insn; 93 | 94 | printf("%s: Found CMP R%d, #%d at %p\n", __FUNCTION__, cmp_insn->rd, cmp_insn->offset, GET_IBOOT_FILE_OFFSET(iboot_in, _cmp_insn)); 95 | 96 | /* Find the next IT EQ/IT NE instruction following the CMP Rd, #0 instruction... (kinda hacky) */ 97 | while(*(uint16_t*)arm32_thumb_IT_insn != ARM32_THUMB_IT_EQ && *(uint16_t*)arm32_thumb_IT_insn != ARM32_THUMB_IT_NE) { 98 | arm32_thumb_IT_insn++; 99 | } 100 | 101 | printf("%s: Found IT EQ/IT NE at %p\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, arm32_thumb_IT_insn)); 102 | 103 | /* MOV Rd, Rs instruction usually follows right after the IT instruction. */ 104 | struct arm32_thumb_hi_reg_op* mov_insn = (struct arm32_thumb_hi_reg_op*) (arm32_thumb_IT_insn + 2); 105 | 106 | printf("%s: Found MOV R%d, R%d at %p\n", __FUNCTION__, mov_insn->rd, mov_insn->rs, GET_IBOOT_FILE_OFFSET(iboot_in, arm32_thumb_IT_insn + 2)); 107 | 108 | /* Find the last LDR Rd which holds the null string pointer... */ 109 | int null_str_reg = (ldr_rd_boot_args->rd == mov_insn->rs) ? mov_insn->rd : mov_insn->rs; 110 | 111 | /* + 0x10: Some iBoots have the null string load after the CMP instruction... */ 112 | void* ldr_null_str = find_last_LDR_rd((uintptr_t) (_cmp_insn + 0x10), 0x200, null_str_reg); 113 | if(!ldr_null_str) { 114 | printf("%s: Unable to find LDR R%d, =null_str\n", __FUNCTION__, null_str_reg); 115 | return 0; 116 | } 117 | 118 | printf("%s: Found LDR R%d, =null_str at %p\n", __FUNCTION__, null_str_reg, GET_IBOOT_FILE_OFFSET(iboot_in, ldr_null_str)); 119 | 120 | /* Calculate the new PC relative load from the default boot args xref to the LDR Rd, =null_string location. */ 121 | uint32_t diff = (uint32_t) (GET_IBOOT_FILE_OFFSET(iboot_in, default_boot_args_xref) - GET_IBOOT_FILE_OFFSET(iboot_in, ldr_null_str)); 122 | 123 | /* T1 LDR PC-based instructions use the immediate 8 bits multiplied by 4. */ 124 | struct arm32_thumb_LDR* ldr_rd_null_str = (struct arm32_thumb_LDR*) ldr_null_str; 125 | printf("%s: Pointing LDR R%d, =null_str to boot-args xref...\n", __FUNCTION__, ldr_rd_null_str->rd); 126 | ldr_rd_null_str->imm8 = (diff / 0x4); 127 | 128 | printf("%s: Leaving...\n", __FUNCTION__); 129 | return 1; 130 | } 131 | 132 | int patch_cmd_handler(struct iboot_img* iboot_in, const char* cmd_str, uint32_t ptr) { 133 | printf("%s: Entering...\n", __FUNCTION__); 134 | 135 | size_t cmd_str_len = strlen(cmd_str); 136 | size_t cmd_bytes_len = cmd_str_len + 2; 137 | 138 | char* cmd_bytes = (char*)malloc(cmd_bytes_len); 139 | if(!cmd_bytes) { 140 | printf("%s: Out of memory.\n", __FUNCTION__); 141 | return 0; 142 | } 143 | 144 | memset(cmd_bytes, 0, cmd_bytes_len); 145 | 146 | /* Fill the buffer to make the string look like \0\0 */ 147 | for(int i = 0; i < cmd_str_len; i++) { 148 | cmd_bytes[i+1] = cmd_str[i]; 149 | } 150 | 151 | /* Find the cmd handler string... */ 152 | void* cmd_ptr_str_loc = memmem(iboot_in->buf, iboot_in->len, cmd_bytes, cmd_bytes_len); 153 | 154 | free(cmd_bytes); 155 | 156 | if(!cmd_ptr_str_loc) { 157 | printf("%s: Unable to find the cmd \"%s\".\n", __FUNCTION__, cmd_str); 158 | return 0; 159 | } 160 | /* +1 to bring the found offset to the beginning of the cmd string... \0\0 --> \0 */ 161 | cmd_ptr_str_loc++; 162 | 163 | printf("%s: Found the cmd string at %p\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, cmd_ptr_str_loc)); 164 | 165 | /* Resolve the cmd table referencing the cmd string... */ 166 | struct iboot32_cmd_t* cmd = (struct iboot32_cmd_t*) iboot_memmem(iboot_in, cmd_ptr_str_loc); 167 | if(!cmd) { 168 | printf("%s: Unable to find a ref to \"%p\".\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, cmd_ptr_str_loc)); 169 | return 0; 170 | } 171 | 172 | printf("%s: Found the cmd string reference at %p\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, (void*) cmd)); 173 | 174 | printf("%s: Pointing \"%s\" from 0x%08x to 0x%08x...\n", __FUNCTION__, cmd_str, cmd->cmd_ptr, ptr); 175 | 176 | /* Point cmd handler to user-specified pointer... */ 177 | cmd->cmd_ptr = ptr; 178 | 179 | printf("%s: Leaving...\n", __FUNCTION__); 180 | 181 | return 1; 182 | } 183 | 184 | int patch_debug_enabled(struct iboot_img* iboot_in) { 185 | printf("%s: Entering...\n", __FUNCTION__); 186 | 187 | /* Find the BL get_value_for_dtre_var insn... */ 188 | void* get_value_for_dtre_bl = find_dtre_get_value_bl_insn(iboot_in, DEBUG_ENABLED_DTRE_VAR_STR); 189 | if(!get_value_for_dtre_bl) { 190 | printf("%s: Unable to find appropriate BL insn.\n", __FUNCTION__); 191 | return 0; 192 | } 193 | 194 | printf("%s: Patching BL insn at %p...\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, get_value_for_dtre_bl)); 195 | 196 | /* BL get_dtre_value --> MOVS R0, #1; MOVS R0, #1 */ 197 | *(uint32_t*)get_value_for_dtre_bl = bswap32(0x01200120); 198 | 199 | printf("%s: Leaving...\n", __FUNCTION__); 200 | return 1; 201 | } 202 | 203 | int patch_rsa_check(struct iboot_img* iboot_in) { 204 | printf("%s: Entering...\n", __FUNCTION__); 205 | 206 | /* Find the BL verify_shsh instruction... */ 207 | void* bl_verify_shsh = find_bl_verify_shsh(iboot_in); 208 | if(!bl_verify_shsh) { 209 | printf("%s: Unable to find BL verify_shsh!\n", __FUNCTION__); 210 | return 0; 211 | } 212 | 213 | printf("%s: Patching BL verify_shsh at %p...\n", __FUNCTION__, GET_IBOOT_FILE_OFFSET(iboot_in, bl_verify_shsh)); 214 | 215 | /* BL verify_shsh --> MOVS R0, #0; STR R0, [R3] */ 216 | *(uint32_t*)bl_verify_shsh = bswap32(0x00201860); 217 | 218 | printf("%s: Leaving...\n", __FUNCTION__); 219 | return 1; 220 | } 221 | --------------------------------------------------------------------------------