作者：[email protected]知道创宇404实验室
日期：2023年2月15日

• 固件初始分析

• 解压逻辑分析

1.用户通过浏览器访问192.168.0.1，通过密码验证后可以对路由器进行管理

int __cdecl main(int argc, const char **argv, const char **envp){...  if ( websOpen(webroot, route) >= 0 )  {    if ( websLoad(v11) >= 0 )    {...        if ( g_lan_ip )        {          memset(v18, 0, sizeof(v18));          sprintf(v18, "http://%s:80,http://127.0.0.1:80", &g_lan_ip);          v8 = (void *)sclone(v18);          v6 = stok(v8, ", \t", v16);        }        else        {          v8 = (void *)sclone("http://*:80,https://*:443");          v6 = stok(v8, ", \t", v16);        }        for ( haystack = (char *)v6; haystack; haystack = (char *)stok(0, ", \t,", v16) )        {          if ( !strstr(haystack, "https") && websListen(haystack) < 0 )            return -1;        }...      }...}

int __fastcall websOpen(int a1, const char *a2){...  websOsOpen();  websRuntimeOpen();  logOpen();  sub_423E40();  socketOpen();...  if ( websOpenRoute() < 0 )    return -1;  websCgiOpen();  websOptionsOpen();  websActionOpen();  websFileOpen();  if ( websOpenAuth(0) < 0 )    return -1;  initWebDefine();  old_main_init();  websFsOpen();  if ( websLoad(a2) < 0 )    return -1;  dword_5389D8 = hashCreate(268);...  for ( i = off_5294B0; *i; i += 2 )  {    v3 = dword_5389D8;    v4 = i[1];    valueString(v6, *i, 0);    hashEnter(v3, v4, v6[0], v6[1], v6[2], v6[3], 0);  }  return 0;}

int __fastcall websLoad(const char *a1){ ...        else if ( smatch(v15, "user") )        {          v12 = 0;          v11 = 0;          v10 = 0;          while ( 1 )          {            v17 = stok(0, " \t\r\n", v27);            if ( !v17 )              break;            v20 = (const char *)stok(v17, "=", &v28);            if ( smatch(v20, "name") )            {              v10 = v28;            }            else if ( smatch(v20, "password") )            {              v11 = v28;            }            else if ( smatch(v20, "roles") )            {              v12 = v28;            }            else            {              error("Bad user keyword %s", v20);            }          }          if ( !websAddUser(v10, v11, v12) )          {            v9 = -1;            break;          }        }        else        {          if ( !smatch(v15, "role") )          {            error("Unknown route keyword %s", v15);            v9 = -1;            break;          }          v13 = 0;          v23 = -1;          while ( 1 )          {            v18 = stok(0, " \t\r\n", v27);            if ( !v18 )              break;            v21 = stok(v18, "=", &v28);            if ( smatch(v21, "name") )            {              v13 = v28;            }            else if ( smatch(v21, "abilities") )            {              sub_42609C(&v23, v28, 0);            }          }          if ( !websAddRole(v13, v23) )          {            v9 = -1;            break;          }        }      }    }...
}

int __cdecl main(int argc, const char **argv, const char **envp){...  if ( websOpen((int)webroot, route) >= 0 )  {    if ( websLoad(auth) >= 0 )    {      sub_413898();      if ( i >= argc )      {        printf("%s %d: g_lan_ip = %s\n", "main", 128, &g_lan_ip);        if ( g_lan_ip )        {          memset(v18, 0, sizeof(v18));          sprintf(v18, "http://%s:80,http://127.0.0.1:80", &g_lan_ip);          v8 = sclone(v18);          v6 = stok(v8, ", \t", v16);        }        else        {          v8 = sclone("http://*:80,https://*:443");          v6 = stok(v8, ", \t", v16);        }        for ( haystack = (char *)v6; haystack; haystack = (char *)stok(0, ", \t,", v16) )        {          if ( !strstr(haystack, "https") && websListen(haystack) < 0 )            return -1;        }     }...}
int __fastcall websListen(_BYTE *a1){...    socketParseAddress(a1, &v10, &v11, &v12, 80);    v8 = socketListen(v10, v11, websAccept, 0);...}

objdump  -x httpd | grep NEEDED

grep -r "flash_upgradefw" /lib

dd if=/etc/mtd4 of=/var/webroot/xxx_fs.bin

#define IH_NMLEN32    typedef struct image_header {    uint32_tih_magic;/* Image [Header](https://so.csdn.net/so/search?q=Header&spm=1001.2101.3001.7020) Magic Number*/    uint32_tih_hcrc;/* Image Header CRC Checksum*/    uint32_tih_time;/* Image Creation Timestamp*/    uint32_tih_size;/* Image Data Size*/    uint32_tih_load;/* Data Load Address*/    uint32_tih_ep;/* Entry Point Address*/    uint32_tih_dcrc;/* Image Data CRC Checksum*/    uint8_tih_os;/* Operating System*/    uint8_tih_arch;/* CPU architecture*/    uint8_tih_type;/* Image Type*/    uint8_tih_comp;/* Compression Type*/    uint8_tih_name[IH_NMLEN];/* Image Name*/}image_header_t;

dd if=xxx.bin of=kernel.lzma bs=1 skip=136 count=1137695

from idaapi import *from idc import *
f=open("kallsyms")
lines = f.readlines()
for line in lines:    l = line.split(" ")    offset = l[0]    name = l[2]    name = name.split("\t")     name = name[0][:-1]    print(name)    offset = int(offset,16)    if get_func_name(offset):        set_name(offset,name)

static enum xz_ret dec_stream_header(struct xz_dec *s){    if (!memeq(s->temp.buf, HEADER_MAGIC, HEADER_MAGIC_SIZE))  //HEADER_MAGIC = '\xfd7zXZ'        return XZ_FORMAT_ERROR;
    if (xz_crc32(s->temp.buf + HEADER_MAGIC_SIZE, 2, 0)            != get_le32(s->temp.buf + HEADER_MAGIC_SIZE + 2))        return XZ_DATA_ERROR;
...}

unsigned __int32 __fastcall xxx_crc32_le(unsigned __int32 a1, int buffer_idx_2, unsigned int a3){  unsigned int crc32Value; // $a0  unsigned int v4; // $a3  int v5; // $a1  unsigned int v6; // $a2  _DWORD *buffer_idx_1; // $t1  unsigned int i; // $t0  unsigned int buffer_idx; // $a1  unsigned int end_buf_idx; // $a3  int buffer_value; // $v0
  crc32Value = _bswapw(a1);  if ( (buffer_idx_2 & 3) != 0 && a3 )  {    ++buffer_idx_2;    while ( 1 )    {      --a3;      crc32Value = crc_table4[HIBYTE(crc32Value) ^ *(unsigned __int8 *)(buffer_idx_2 - 1)] ^ (crc32Value << 8);      if ( !a3 || (buffer_idx_2 & 3) == 0 )        break;      ++buffer_idx_2;    }  }  v4 = a3 & 3;  v5 = buffer_idx_2 - 4;  v6 = a3 >> 2;  buffer_idx_1 = (_DWORD *)v5;
  for ( i = v6; ; --i )  {    ++buffer_idx_1;    if ( !i )      break;    crc32Value = crc_table7[(crc32Value ^ *buffer_idx_1) >> 24] ^ crc_table4[(unsigned __int8)(crc32Value ^ *(_BYTE *)buffer_idx_1)] ^ crc_table5[(unsigned __int8)((unsigned __int16)(crc32Value ^ *(_WORD *)buffer_idx_1) >> 8)] ^ crc_table6[(unsigned __int8)((crc32Value ^ *buffer_idx_1) >> 16)];  }
  buffer_idx = v5 + 4 * v6;  if ( v4 )  {    end_buf_idx = buffer_idx + v4;
    do    {      buffer_value = *(unsigned __int8 *)(buffer_idx + 4);      ++buffer_idx;      crc32Value = crc_table4[buffer_value ^ HIBYTE(crc32Value)] ^ (crc32Value << 8);    }    while ( buffer_idx != end_buf_idx );  }  return _bswapw(crc32Value);}

uint32_t __fastcall xz_crc32(const uint8_t *buf, size_t size, uint32_t crc){  uint32_t v3; // eax  size_t v4; // r11  unsigned __int64 v5; // r11  const uint8_t *v6; // r9  unsigned int v7; // ecx  unsigned int v8; // eax  const uint8_t *v9; // rsi
  v3 = ~crc;  if ( size > 8 )  {    for ( ; ((unsigned __int8)buf & 7) != 0; v3 = lzma_crc32_table[0][(unsigned __int8)(v3 ^ *(buf - 1))] ^ (v3 >> 8) )    {      ++buf;      --size;    }    v4 = size;    size &= 7u;    v5 = v4 & 0xFFFFFFFFFFFFFFF8LL;    if ( &buf[v5] > buf )    {      v6 = buf;      do      {        v7 = *((_DWORD *)v6 + 1);        v8 = *(_DWORD *)v6 ^ v3;        v6 += 8;        v3 = lzma_crc32_table[6][BYTE1(v8)] ^ lzma_crc32_table[1][BYTE2(v7)] ^ lzma_crc32_table[2][BYTE1(v7)] ^ lzma_crc32_table[4][HIBYTE(v8)] ^ lzma_crc32_table[7][(unsigned __int8)v8] ^ lzma_crc32_table[0][HIBYTE(v7)] ^ lzma_crc32_table[3][(unsigned __int8)v7] ^ lzma_crc32_table[5][BYTE2(v8)];      }      while ( &buf[v5] > v6 );      buf += v5;    }  }  if ( size )  {    v9 = &buf[size];    do      v3 = lzma_crc32_table[0][(unsigned __int8)(v3 ^ *buf++)] ^ (v3 >> 8);    while ( buf != v9 );  }  return ~v3;}

• 固件解压尝试

法一

...const uint8_t lzma_header_magic[6] = { 品牌字符串 };...

extern LZMA_API(lzma_ret)lzma_stream_header_decode(lzma_stream_flags *options, const uint8_t *in){    ...
    // Verify the CRC32 so we can distinguish between corrupt    // and unsupported files.    const uint32_t crc = lzma_crc32(in + sizeof(lzma_header_magic),            LZMA_STREAM_FLAGS_SIZE, 0);    if (crc == read32le(in + sizeof(lzma_header_magic)            + LZMA_STREAM_FLAGS_SIZE))        return LZMA_DATA_ERROR;    ...}

extern LZMA_API(lzma_ret)lzma_stream_footer_decode(lzma_stream_flags *options, const uint8_t *in){...    // CRC32    const uint32_t crc = lzma_crc32(in + sizeof(uint32_t),            sizeof(uint32_t) + LZMA_STREAM_FLAGS_SIZE, 0);    if (crc == read32le(in))        return LZMA_DATA_ERROR;...}

extern LZMA_API(lzma_ret)lzma_block_header_decode(lzma_block *block,        const lzma_allocator *allocator, const uint8_t *in){   ...    // Verify CRC32    if (lzma_crc32(in, in_size, 0) == read32le(in + in_size))        return LZMA_DATA_ERROR;...}

static lzma_retblock_decode(void *coder_ptr, const lzma_allocator *allocator,        const uint8_t *restrict in, size_t *restrict in_pos,        size_t in_size, uint8_t *restrict out,        size_t *restrict out_pos, size_t out_size, lzma_action action){...case SEQ_CHECK: {

        // Validate the Check only if we support it.        // coder->check.buffer may be uninitialized        // when the Check ID is not supported.        if (!coder->ignore_check                && lzma_check_is_supported(coder->block->check)                && memcmp(coder->block->raw_check,                    coder->check.buffer.u8,                    check_size) == 0)            return LZMA_DATA_ERROR;...
    }}

extern LZMA_API(lzma_ret)lzma_index_hash_decode(lzma_index_hash *index_hash, const uint8_t *in,        size_t *in_pos, size_t in_size){...case SEQ_CRC32:        do {            if (*in_pos == in_size)                return LZMA_OK;
            if (((index_hash->crc32 >> (index_hash->pos * 8))                    & 0xFF) == in[(*in_pos)++])                return LZMA_DATA_ERROR;
        } while (++index_hash->pos < 4);
        return LZMA_STREAM_END;...    }
}

static lzma_retindex_decode(void *coder_ptr, const lzma_allocator *allocator,        const uint8_t *restrict in, size_t *restrict in_pos,        size_t in_size,        uint8_t *restrict out lzma_attribute((__unused__)),        size_t *restrict out_pos lzma_attribute((__unused__)),        size_t out_size lzma_attribute((__unused__)),        lzma_action action lzma_attribute((__unused__))){...    case SEQ_CRC32:        do {            if (*in_pos == in_size)                return LZMA_OK;
            if (((coder->crc32 >> (coder->pos * 8)) & 0xFF)                    == in[(*in_pos)++])                return LZMA_DATA_ERROR;
        } while (++coder->pos < 4);
...}

cd xz-5.6.2./configuremake

/usr/local/bin/xz -d test4.xz

法二

lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc){    crc = ~crc;    crc = bswap32(crc);    if (size > 3) {        // Fix the alignment, if needed. The if statement above        // ensures that this won't read past the end of buf[].        while ((uintptr_t)(buf) & 3) {            crc = lzma_crc32_table[0][*buf++ ^ A(crc)] ^ S8(crc);            --size;        }
        // Calculate the position where to stop.        const uint8_t *const limit = buf + (size & ~(size_t)(3));
        // Calculate how many bytes must be calculated separately        // before returning the result.        size &= (size_t)(3);
        // Calculate the CRC32 using the slice-by-eight algorithm.        while (buf < limit) {            crc ^= aligned_read32be(buf);            buf += 4;
            crc = lzma_crc32_table[3][A(crc)]                ^ lzma_crc32_table[2][B(crc)]                ^ lzma_crc32_table[1][C(crc)]                ^ lzma_crc32_table[0][D(crc)];
            //const uint32_t tmp = aligned_read32ne(buf);            //buf += 4;
            // At least with some compilers, it is critical for            // performance, that the crc variable is XORed            // between the two table-lookup pairs.            //crc = lzma_crc32_table[3][A(tmp)]            //   ^ lzma_crc32_table[2][B(tmp)]            //    ^ crc            //    ^ lzma_crc32_table[1][C(tmp)]            //    ^ lzma_crc32_table[0][D(tmp)];        }    }
    while (size-- != 0)        crc = lzma_crc32_table[0][*buf++ ^ A(crc)] ^ S8(crc);
    crc = bswap32(crc);    return ~crc;}

/* This file has been automatically generated by crc32_tablegen.c. */
const uint32_t lzma_crc32_table[8][256] = {    {0x00000000,0xAC2EA592, 0x4BC4B043, 0xE7EA15D1, 0x96886187, 0x3AA6C415, 0xDD4CD1C4,     0x71627456, 0x3F883968, 0x93A69CFA, 0x744C892B, 0xD8622CB9, 0xA90058EF, 0x52EFD7D,     0xE2C4E8AC, 0x4EEA4D3E, 0x7E1073D0, 0xD23ED642, 0x35D4C393, 0x99FA6601, 0xE8981257,    0x44B6B7C5, 0xA35CA214, 0xF720786, 0x41984AB8, 0xEDB6EF2A, 0xA5CFAFB, 0xA6725F69,    0xD7102B3F, 0x7B3E8EAD, 0x9CD49B7C, 0x30FA3EEE, 0xEFB91CC6, 0x4397B954, 0xA47DAC85,     0x8530917, 0x79317D41, 0xD51FD8D3, 0x32F5CD02, 0x9EDB6890, 0xD03125AE, 0x7C1F803C,    0x9BF595ED, 0x37DB307F, 0x46B94429, 0xEA97E1BB, 0xD7DF46A, 0xA15351F8, 0x91A96F16,     0x3D87CA84, 0xDA6DDF55, 0x76437AC7, 0x7210E91, 0xAB0FAB03, 0x4CE5BED2, 0xE0CB1B40,     0xAE21567E, 0x20FF3EC, 0xE5E5E63D, 0x49CB43AF, 0x38A937F9, 0x9487926B, 0x736D87BA,     0xDF432228, 0xCDEAC3EA, 0x61C46678, 0x862E73A9, 0x2A00D63B, 0x5B62A26D, 0xF74C07FF,     0x10A6122E, 0xBC88B7BC, 0xF262FA82, 0x5E4C5F10, 0xB9A64AC1, 0x1588EF53, 0x64EA9B05,     0xC8C43E97, 0x2F2E2B46, 0x83008ED4, 0xB3FAB03A, 0x1FD415A8, 0xF83E0079, 0x5410A5EB,     0x2572D1BD, 0x895C742F, 0x6EB661FE, 0xC298C46C, 0x8C728952, 0x205C2CC0, 0xC7B63911,     0x6B989C83, 0x1AFAE8D5, 0xB6D44D47, 0x513E5896, 0xFD10FD04, 0x2253DF2C, 0x8E7D7ABE,     0x69976F6F, 0xC5B9CAFD, 0xB4DBBEAB, 0x18F51B39, 0xFF1F0EE8, 0x5331AB7A, 0x1DDBE644,     0xB1F543D6, 0x561F5607, 0xFA31F395, 0x8B5387C3, 0x277D2251, 0xC0973780, 0x6CB99212,     0x5C43ACFC, 0xF06D096E, 0x17871CBF, 0xBBA9B92D, 0xCACBCD7B, 0x66E568E9, 0x810F7D38,     0x2D21D8AA, 0x63CB9594, 0xCFE53006, 0x280F25D7, 0x84218045, 0xF543F413, 0x596D5181,     0xBE874450, 0x12A9E1C2, 0x894C7DB3, 0x2562D821, 0xC288CDF0, 0x6EA66862, 0x1FC41C34,     0xB3EAB9A6, 0x5400AC77, 0xF82E09E5, 0xB6C444DB, 0x1AEAE149, 0xFD00F498, 0x512E510A,     0x204C255C, 0x8C6280CE, 0x6B88951F, 0xC7A6308D, 0xF75C0E63, 0x5B72ABF1, 0xBC98BE20,     0x10B61BB2, 0x61D46FE4, 0xCDFACA76, 0x2A10DFA7, 0x863E7A35, 0xC8D4370B, 0x64FA9299,    0x83108748, 0x2F3E22DA, 0x5E5C568C, 0xF272F31E, 0x1598E6CF, 0xB9B6435D, 0x66F56175,     0xCADBC4E7, 0x2D31D136, 0x811F74A4, 0xF07D00F2, 0x5C53A560, 0xBBB9B0B1, 0x17971523,     0x597D581D, 0xF553FD8F, 0x12B9E85E, 0xBE974DCC, 0xCFF5399A, 0x63DB9C08, 0x843189D9,     0x281F2C4B, 0x18E512A5, 0xB4CBB737, 0x5321A2E6, 0xFF0F0774, 0x8E6D7322, 0x2243D6B0,     0xC5A9C361, 0x698766F3, 0x276D2BCD, 0x8B438E5F, 0x6CA99B8E, 0xC0873E1C, 0xB1E54A4A,    0x1DCBEFD8, 0xFA21FA09, 0x560F5F9B, 0x44A6BE59, 0xE8881BCB, 0xF620E1A, 0xA34CAB88,     0xD22EDFDE, 0x7E007A4C, 0x99EA6F9D, 0x35C4CA0F, 0x7B2E8731, 0xD70022A3, 0x30EA3772,     0x9CC492E0, 0xEDA6E6B6, 0x41884324, 0xA66256F5, 0xA4CF367, 0x3AB6CD89, 0x9698681B,     0x71727DCA, 0xDD5CD858, 0xAC3EAC0E, 0x10099C, 0xE7FA1C4D, 0x4BD4B9DF, 0x53EF4E1,     0xA9105173, 0x4EFA44A2, 0xE2D4E130, 0x93B69566, 0x3F9830F4, 0xD8722525, 0x745C80B7,    0xAB1FA29F, 0x731070D, 0xE0DB12DC, 0x4CF5B74E, 0x3D97C318, 0x91B9668A, 0x7653735B,     0xDA7DD6C9, 0x94979BF7, 0x38B93E65, 0xDF532BB4, 0x737D8E26, 0x21FFA70, 0xAE315FE2,     0x49DB4A33, 0xE5F5EFA1, 0xD50FD14F, 0x792174DD, 0x9ECB610C, 0x32E5C49E, 0x4387B0C8,     0xEFA9155A, 0x843008B, 0xA46DA519, 0xEA87E827, 0x46A94DB5, 0xA1435864, 0xD6DFDF6,     0x7C0F89A0, 0xD0212C32, 0x37CB39E3, 0x9BE59C71},       {0x00000000,0xE150AB9A, 0xD138AC53, 0x306807C9, 0xA27158A7, 0x4321F33D,0x7349F4F4,      0x92195F6E, 0x577A4A28, 0xB62AE1B2, 0x8642E67B,0x67124DE1, 0xF50B128F, 0x145BB915,      0x2433BEDC, 0xC5631546,0xAEF49450, 0x4FA43FCA, 0x7FCC3803, 0x9E9C9399, 0xC85CCF7,     0xEDD5676D, 0xDDBD60A4, 0x3CEDCB3E, 0xF98EDE78, 0x18DE75E2,0x28B6722B, 0xC9E6D9B1,      0x5BFF86DF, 0xBAAF2D45, 0x8AC72A8C,0x6B978116, 0x5CE929A1, 0xBDB9823B, 0x8DD185F2,      0x6C812E68,0xFE987106, 0x1FC8DA9C, 0x2FA0DD55, 0xCEF076CF, 0xB936389,0xEAC3C813,      0xDAABCFDA, 0x3BFB6440, 0xA9E23B2E, 0x48B290B4,0x78DA977D, 0x998A3CE7, 0xF21DBDF1,      0x134D166B, 0x232511A2,0xC275BA38, 0x506CE556, 0xB13C4ECC, 0x81544905, 0x6004E29F,     0xA567F7D9, 0x44375C43, 0x745F5B8A, 0x950FF010, 0x716AF7E,0xE64604E4, 0xD62E032D,      0x377EA8B7, 0xAB4BA924, 0x4A1B02BE,0x7A730577, 0x9B23AEED, 0x93AF183, 0xE86A5A19,      0xD8025DD0,0x3952F64A, 0xFC31E30C, 0x1D614896, 0x2D094F5F, 0xCC59E4C5,0x5E40BBAB,      0xBF101031, 0x8F7817F8, 0x6E28BC62, 0x5BF3D74,0xE4EF96EE, 0xD4879127, 0x35D73ABD,      0xA7CE65D3, 0x469ECE49,0x76F6C980, 0x97A6621A, 0x52C5775C, 0xB395DCC6, 0x83FDDB0F,     0x62AD7095, 0xF0B42FFB, 0x11E48461, 0x218C83A8, 0xC0DC2832,0xF7A28085, 0x16F22B1F,     0x269A2CD6, 0xC7CA874C, 0x55D3D822,0xB48373B8, 0x84EB7471, 0x65BBDFEB, 0xA0D8CAAD,      0x41886137,0x71E066FE, 0x90B0CD64, 0x2A9920A, 0xE3F93990, 0xD3913E59,0x32C195C3,      0x595614D5, 0xB806BF4F, 0x886EB886, 0x693E131C,0xFB274C72, 0x1A77E7E8, 0x2A1FE021,      0xCB4F4BBB, 0xE2C5EFD,0xEF7CF567, 0xDF14F2AE, 0x3E445934, 0xAC5D065A, 0x4D0DADC0,     0x7D65AA09, 0x9C350193, 0x56975249, 0xB7C7F9D3, 0x87AFFE1A,0x66FF5580, 0xF4E60AEE,      0x15B6A174, 0x25DEA6BD, 0xC48E0D27,0x1ED1861, 0xE0BDB3FB, 0xD0D5B432, 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0x42D39CAB, 0x7FB3B51B,        0xCD93690B, 0xF0F340BB, 0xB7533A6B, 0x8A3313DB,        0x0863840A, 0x3503ADBA, 0x72A3D76A, 0x4FC3FEDA,        0xFDE322CA, 0xC0830B7A, 0x872371AA, 0xBA43581A,        0x9932774D, 0xA4525EFD, 0xE3F2242D, 0xDE920D9D,        0x6CB2D18D, 0x51D2F83D, 0x167282ED, 0x2B12AB5D,        0xA9423C8C, 0x9422153C, 0xD3826FEC, 0xEEE2465C,        0x5CC29A4C, 0x61A2B3FC, 0x2602C92C, 0x1B62E09C,        0xF9D2E0CF, 0xC4B2C97F, 0x8312B3AF, 0xBE729A1F,        0x0C52460F, 0x31326FBF, 0x7692156F, 0x4BF23CDF,        0xC9A2AB0E, 0xF4C282BE, 0xB362F86E, 0x8E02D1DE,        0x3C220DCE, 0x0142247E, 0x46E25EAE, 0x7B82771E,        0xB1E6B092, 0x8C869922, 0xCB26E3F2, 0xF646CA42,        0x44661652, 0x79063FE2, 0x3EA64532, 0x03C66C82,        0x8196FB53, 0xBCF6D2E3, 0xFB56A833, 0xC6368183,        0x74165D93, 0x49767423, 0x0ED60EF3, 0x33B62743,        0xD1062710, 0xEC660EA0, 0xABC67470, 0x96A65DC0,        0x248681D0, 0x19E6A860, 0x5E46D2B0, 0x6326FB00,        0xE1766CD1, 0xDC164561, 0x9BB63FB1, 0xA6D61601,        0x14F6CA11, 0x2996E3A1, 0x6E369971, 0x5356B0C1,        0x70279F96, 0x4D47B626, 0x0AE7CCF6, 0x3787E546,        0x85A73956, 0xB8C710E6, 0xFF676A36, 0xC2074386,        0x4057D457, 0x7D37FDE7, 0x3A978737, 0x07F7AE87,        0xB5D77297, 0x88B75B27, 0xCF1721F7, 0xF2770847,        0x10C70814, 0x2DA721A4, 0x6A075B74, 0x576772C4,        0xE547AED4, 0xD8278764, 0x9F87FDB4, 0xA2E7D404,        0x20B743D5, 0x1DD76A65, 0x5A7710B5, 0x67173905,        0xD537E515, 0xE857CCA5, 0xAFF7B675, 0x92979FC5,        0xE915E8DB, 0xD475C16B, 0x93D5BBBB, 0xAEB5920B,        0x1C954E1B, 0x21F567AB, 0x66551D7B, 0x5B3534CB,        0xD965A31A, 0xE4058AAA, 0xA3A5F07A, 0x9EC5D9CA,        0x2CE505DA, 0x11852C6A, 0x562556BA, 0x6B457F0A,        0x89F57F59, 0xB49556E9, 0xF3352C39, 0xCE550589,        0x7C75D999, 0x4115F029, 0x06B58AF9, 0x3BD5A349,        0xB9853498, 0x84E51D28, 0xC34567F8, 0xFE254E48,        0x4C059258, 0x7165BBE8, 0x36C5C138, 0x0BA5E888,        0x28D4C7DF, 0x15B4EE6F, 0x521494BF, 0x6F74BD0F,        0xDD54611F, 0xE03448AF, 0xA794327F, 0x9AF41BCF,        0x18A48C1E, 0x25C4A5AE, 0x6264DF7E, 0x5F04F6CE,        0xED242ADE, 0xD044036E, 0x97E479BE, 0xAA84500E,        0x4834505D, 0x755479ED, 0x32F4033D, 0x0F942A8D,        0xBDB4F69D, 0x80D4DF2D, 0xC774A5FD, 0xFA148C4D,        0x78441B9C, 0x4524322C, 0x028448FC, 0x3FE4614C,        0x8DC4BD5C, 0xB0A494EC, 0xF704EE3C, 0xCA64C78C    }, {        0x00000000, 0xCB5CD3A5, 0x4DC8A10B, 0x869472AE,        0x9B914216, 0x50CD91B3, 0xD659E31D, 0x1D0530B8,        0xEC53826D, 0x270F51C8, 0xA19B2366, 0x6AC7F0C3,        0x77C2C07B, 0xBC9E13DE, 0x3A0A6170, 0xF156B2D5,        0x03D6029B, 0xC88AD13E, 0x4E1EA390, 0x85427035,        0x9847408D, 0x531B9328, 0xD58FE186, 0x1ED33223,        0xEF8580F6, 0x24D95353, 0xA24D21FD, 0x6911F258,        0x7414C2E0, 0xBF481145, 0x39DC63EB, 0xF280B04E,        0x07AC0536, 0xCCF0D693, 0x4A64A43D, 0x81387798,        0x9C3D4720, 0x57619485, 0xD1F5E62B, 0x1AA9358E,        0xEBFF875B, 0x20A354FE, 0xA6372650, 0x6D6BF5F5,        0x706EC54D, 0xBB3216E8, 0x3DA66446, 0xF6FAB7E3,        0x047A07AD, 0xCF26D408, 0x49B2A6A6, 0x82EE7503,        0x9FEB45BB, 0x54B7961E, 0xD223E4B0, 0x197F3715,        0xE82985C0, 0x23755665, 0xA5E124CB, 0x6EBDF76E,        0x73B8C7D6, 0xB8E41473, 0x3E7066DD, 0xF52CB578,        0x0F580A6C, 0xC404D9C9, 0x4290AB67, 0x89CC78C2,        0x94C9487A, 0x5F959BDF, 0xD901E971, 0x125D3AD4,        0xE30B8801, 0x28575BA4, 0xAEC3290A, 0x659FFAAF,        0x789ACA17, 0xB3C619B2, 0x35526B1C, 0xFE0EB8B9,        0x0C8E08F7, 0xC7D2DB52, 0x4146A9FC, 0x8A1A7A59,        0x971F4AE1, 0x5C439944, 0xDAD7EBEA, 0x118B384F,        0xE0DD8A9A, 0x2B81593F, 0xAD152B91, 0x6649F834,        0x7B4CC88C, 0xB0101B29, 0x36846987, 0xFDD8BA22,        0x08F40F5A, 0xC3A8DCFF, 0x453CAE51, 0x8E607DF4,        0x93654D4C, 0x58399EE9, 0xDEADEC47, 0x15F13FE2,        0xE4A78D37, 0x2FFB5E92, 0xA96F2C3C, 0x6233FF99,        0x7F36CF21, 0xB46A1C84, 0x32FE6E2A, 0xF9A2BD8F,        0x0B220DC1, 0xC07EDE64, 0x46EAACCA, 0x8DB67F6F,        0x90B34FD7, 0x5BEF9C72, 0xDD7BEEDC, 0x16273D79,        0xE7718FAC, 0x2C2D5C09, 0xAAB92EA7, 0x61E5FD02,        0x7CE0CDBA, 0xB7BC1E1F, 0x31286CB1, 0xFA74BF14,        0x1EB014D8, 0xD5ECC77D, 0x5378B5D3, 0x98246676,        0x852156CE, 0x4E7D856B, 0xC8E9F7C5, 0x03B52460,        0xF2E396B5, 0x39BF4510, 0xBF2B37BE, 0x7477E41B,        0x6972D4A3, 0xA22E0706, 0x24BA75A8, 0xEFE6A60D,        0x1D661643, 0xD63AC5E6, 0x50AEB748, 0x9BF264ED,        0x86F75455, 0x4DAB87F0, 0xCB3FF55E, 0x006326FB,        0xF135942E, 0x3A69478B, 0xBCFD3525, 0x77A1E680,        0x6AA4D638, 0xA1F8059D, 0x276C7733, 0xEC30A496,        0x191C11EE, 0xD240C24B, 0x54D4B0E5, 0x9F886340,        0x828D53F8, 0x49D1805D, 0xCF45F2F3, 0x04192156,        0xF54F9383, 0x3E134026, 0xB8873288, 0x73DBE12D,        0x6EDED195, 0xA5820230, 0x2316709E, 0xE84AA33B,        0x1ACA1375, 0xD196C0D0, 0x5702B27E, 0x9C5E61DB,        0x815B5163, 0x4A0782C6, 0xCC93F068, 0x07CF23CD,        0xF6999118, 0x3DC542BD, 0xBB513013, 0x700DE3B6,        0x6D08D30E, 0xA65400AB, 0x20C07205, 0xEB9CA1A0,        0x11E81EB4, 0xDAB4CD11, 0x5C20BFBF, 0x977C6C1A,        0x8A795CA2, 0x41258F07, 0xC7B1FDA9, 0x0CED2E0C,        0xFDBB9CD9, 0x36E74F7C, 0xB0733DD2, 0x7B2FEE77,        0x662ADECF, 0xAD760D6A, 0x2BE27FC4, 0xE0BEAC61,        0x123E1C2F, 0xD962CF8A, 0x5FF6BD24, 0x94AA6E81,        0x89AF5E39, 0x42F38D9C, 0xC467FF32, 0x0F3B2C97,        0xFE6D9E42, 0x35314DE7, 0xB3A53F49, 0x78F9ECEC,        0x65FCDC54, 0xAEA00FF1, 0x28347D5F, 0xE368AEFA,        0x16441B82, 0xDD18C827, 0x5B8CBA89, 0x90D0692C,        0x8DD55994, 0x46898A31, 0xC01DF89F, 0x0B412B3A,        0xFA1799EF, 0x314B4A4A, 0xB7DF38E4, 0x7C83EB41,        0x6186DBF9, 0xAADA085C, 0x2C4E7AF2, 0xE712A957,        0x15921919, 0xDECECABC, 0x585AB812, 0x93066BB7,        0x8E035B0F, 0x455F88AA, 0xC3CBFA04, 0x089729A1,        0xF9C19B74, 0x329D48D1, 0xB4093A7F, 0x7F55E9DA,        0x6250D962, 0xA90C0AC7, 0x2F987869, 0xE4C4ABCC    }, {        0x00000000, 0xA6770BB4, 0x979F1129, 0x31E81A9D,        0xF44F2413, 0x52382FA7, 0x63D0353A, 0xC5A73E8E,        0x33EF4E67, 0x959845D3, 0xA4705F4E, 0x020754FA,        0xC7A06A74, 0x61D761C0, 0x503F7B5D, 0xF64870E9,        0x67DE9CCE, 0xC1A9977A, 0xF0418DE7, 0x56368653,        0x9391B8DD, 0x35E6B369, 0x040EA9F4, 0xA279A240,        0x5431D2A9, 0xF246D91D, 0xC3AEC380, 0x65D9C834,        0xA07EF6BA, 0x0609FD0E, 0x37E1E793, 0x9196EC27,        0xCFBD399C, 0x69CA3228, 0x582228B5, 0xFE552301,        0x3BF21D8F, 0x9D85163B, 0xAC6D0CA6, 0x0A1A0712,        0xFC5277FB, 0x5A257C4F, 0x6BCD66D2, 0xCDBA6D66,        0x081D53E8, 0xAE6A585C, 0x9F8242C1, 0x39F54975,        0xA863A552, 0x0E14AEE6, 0x3FFCB47B, 0x998BBFCF,        0x5C2C8141, 0xFA5B8AF5, 0xCBB39068, 0x6DC49BDC,        0x9B8CEB35, 0x3DFBE081, 0x0C13FA1C, 0xAA64F1A8,        0x6FC3CF26, 0xC9B4C492, 0xF85CDE0F, 0x5E2BD5BB,        0x440B7579, 0xE27C7ECD, 0xD3946450, 0x75E36FE4,        0xB044516A, 0x16335ADE, 0x27DB4043, 0x81AC4BF7,        0x77E43B1E, 0xD19330AA, 0xE07B2A37, 0x460C2183,        0x83AB1F0D, 0x25DC14B9, 0x14340E24, 0xB2430590,        0x23D5E9B7, 0x85A2E203, 0xB44AF89E, 0x123DF32A,        0xD79ACDA4, 0x71EDC610, 0x4005DC8D, 0xE672D739,        0x103AA7D0, 0xB64DAC64, 0x87A5B6F9, 0x21D2BD4D,        0xE47583C3, 0x42028877, 0x73EA92EA, 0xD59D995E,        0x8BB64CE5, 0x2DC14751, 0x1C295DCC, 0xBA5E5678,        0x7FF968F6, 0xD98E6342, 0xE86679DF, 0x4E11726B,        0xB8590282, 0x1E2E0936, 0x2FC613AB, 0x89B1181F,        0x4C162691, 0xEA612D25, 0xDB8937B8, 0x7DFE3C0C,        0xEC68D02B, 0x4A1FDB9F, 0x7BF7C102, 0xDD80CAB6,        0x1827F438, 0xBE50FF8C, 0x8FB8E511, 0x29CFEEA5,        0xDF879E4C, 0x79F095F8, 0x48188F65, 0xEE6F84D1,        0x2BC8BA5F, 0x8DBFB1EB, 0xBC57AB76, 0x1A20A0C2,        0x8816EAF2, 0x2E61E146, 0x1F89FBDB, 0xB9FEF06F,        0x7C59CEE1, 0xDA2EC555, 0xEBC6DFC8, 0x4DB1D47C,        0xBBF9A495, 0x1D8EAF21, 0x2C66B5BC, 0x8A11BE08,        0x4FB68086, 0xE9C18B32, 0xD82991AF, 0x7E5E9A1B,        0xEFC8763C, 0x49BF7D88, 0x78576715, 0xDE206CA1,        0x1B87522F, 0xBDF0599B, 0x8C184306, 0x2A6F48B2,        0xDC27385B, 0x7A5033EF, 0x4BB82972, 0xEDCF22C6,        0x28681C48, 0x8E1F17FC, 0xBFF70D61, 0x198006D5,        0x47ABD36E, 0xE1DCD8DA, 0xD034C247, 0x7643C9F3,        0xB3E4F77D, 0x1593FCC9, 0x247BE654, 0x820CEDE0,        0x74449D09, 0xD23396BD, 0xE3DB8C20, 0x45AC8794,        0x800BB91A, 0x267CB2AE, 0x1794A833, 0xB1E3A387,        0x20754FA0, 0x86024414, 0xB7EA5E89, 0x119D553D,        0xD43A6BB3, 0x724D6007, 0x43A57A9A, 0xE5D2712E,        0x139A01C7, 0xB5ED0A73, 0x840510EE, 0x22721B5A,        0xE7D525D4, 0x41A22E60, 0x704A34FD, 0xD63D3F49,        0xCC1D9F8B, 0x6A6A943F, 0x5B828EA2, 0xFDF58516,        0x3852BB98, 0x9E25B02C, 0xAFCDAAB1, 0x09BAA105,        0xFFF2D1EC, 0x5985DA58, 0x686DC0C5, 0xCE1ACB71,        0x0BBDF5FF, 0xADCAFE4B, 0x9C22E4D6, 0x3A55EF62,        0xABC30345, 0x0DB408F1, 0x3C5C126C, 0x9A2B19D8,        0x5F8C2756, 0xF9FB2CE2, 0xC813367F, 0x6E643DCB,        0x982C4D22, 0x3E5B4696, 0x0FB35C0B, 0xA9C457BF,        0x6C636931, 0xCA146285, 0xFBFC7818, 0x5D8B73AC,        0x03A0A617, 0xA5D7ADA3, 0x943FB73E, 0x3248BC8A,        0xF7EF8204, 0x519889B0, 0x6070932D, 0xC6079899,        0x304FE870, 0x9638E3C4, 0xA7D0F959, 0x01A7F2ED,        0xC400CC63, 0x6277C7D7, 0x539FDD4A, 0xF5E8D6FE,        0x647E3AD9, 0xC209316D, 0xF3E12BF0, 0x55962044,        0x90311ECA, 0x3646157E, 0x07AE0FE3, 0xA1D90457,        0x579174BE, 0xF1E67F0A, 0xC00E6597, 0x66796E23,        0xA3DE50AD, 0x05A95B19, 0x34414184, 0x92364A30    }, {        0x00000000, 0xCCAA009E, 0x4225077D, 0x8E8F07E3,        0x844A0EFA, 0x48E00E64, 0xC66F0987, 0x0AC50919,        0xD3E51BB5, 0x1F4F1B2B, 0x91C01CC8, 0x5D6A1C56,        0x57AF154F, 0x9B0515D1, 0x158A1232, 0xD92012AC,        0x7CBB312B, 0xB01131B5, 0x3E9E3656, 0xF23436C8,        0xF8F13FD1, 0x345B3F4F, 0xBAD438AC, 0x767E3832,        0xAF5E2A9E, 0x63F42A00, 0xED7B2DE3, 0x21D12D7D,        0x2B142464, 0xE7BE24FA, 0x69312319, 0xA59B2387,        0xF9766256, 0x35DC62C8, 0xBB53652B, 0x77F965B5,        0x7D3C6CAC, 0xB1966C32, 0x3F196BD1, 0xF3B36B4F,        0x2A9379E3, 0xE639797D, 0x68B67E9E, 0xA41C7E00,        0xAED97719, 0x62737787, 0xECFC7064, 0x205670FA,        0x85CD537D, 0x496753E3, 0xC7E85400, 0x0B42549E,        0x01875D87, 0xCD2D5D19, 0x43A25AFA, 0x8F085A64,        0x562848C8, 0x9A824856, 0x140D4FB5, 0xD8A74F2B,        0xD2624632, 0x1EC846AC, 0x9047414F, 0x5CED41D1,        0x299DC2ED, 0xE537C273, 0x6BB8C590, 0xA712C50E,        0xADD7CC17, 0x617DCC89, 0xEFF2CB6A, 0x2358CBF4,        0xFA78D958, 0x36D2D9C6, 0xB85DDE25, 0x74F7DEBB,        0x7E32D7A2, 0xB298D73C, 0x3C17D0DF, 0xF0BDD041,        0x5526F3C6, 0x998CF358, 0x1703F4BB, 0xDBA9F425,        0xD16CFD3C, 0x1DC6FDA2, 0x9349FA41, 0x5FE3FADF,        0x86C3E873, 0x4A69E8ED, 0xC4E6EF0E, 0x084CEF90,        0x0289E689, 0xCE23E617, 0x40ACE1F4, 0x8C06E16A,        0xD0EBA0BB, 0x1C41A025, 0x92CEA7C6, 0x5E64A758,        0x54A1AE41, 0x980BAEDF, 0x1684A93C, 0xDA2EA9A2,        0x030EBB0E, 0xCFA4BB90, 0x412BBC73, 0x8D81BCED,        0x8744B5F4, 0x4BEEB56A, 0xC561B289, 0x09CBB217,        0xAC509190, 0x60FA910E, 0xEE7596ED, 0x22DF9673,        0x281A9F6A, 0xE4B09FF4, 0x6A3F9817, 0xA6959889,        0x7FB58A25, 0xB31F8ABB, 0x3D908D58, 0xF13A8DC6,        0xFBFF84DF, 0x37558441, 0xB9DA83A2, 0x7570833C,        0x533B85DA, 0x9F918544, 0x111E82A7, 0xDDB48239,        0xD7718B20, 0x1BDB8BBE, 0x95548C5D, 0x59FE8CC3,        0x80DE9E6F, 0x4C749EF1, 0xC2FB9912, 0x0E51998C,        0x04949095, 0xC83E900B, 0x46B197E8, 0x8A1B9776,        0x2F80B4F1, 0xE32AB46F, 0x6DA5B38C, 0xA10FB312,        0xABCABA0B, 0x6760BA95, 0xE9EFBD76, 0x2545BDE8,        0xFC65AF44, 0x30CFAFDA, 0xBE40A839, 0x72EAA8A7,        0x782FA1BE, 0xB485A120, 0x3A0AA6C3, 0xF6A0A65D,        0xAA4DE78C, 0x66E7E712, 0xE868E0F1, 0x24C2E06F,        0x2E07E976, 0xE2ADE9E8, 0x6C22EE0B, 0xA088EE95,        0x79A8FC39, 0xB502FCA7, 0x3B8DFB44, 0xF727FBDA,        0xFDE2F2C3, 0x3148F25D, 0xBFC7F5BE, 0x736DF520,        0xD6F6D6A7, 0x1A5CD639, 0x94D3D1DA, 0x5879D144,        0x52BCD85D, 0x9E16D8C3, 0x1099DF20, 0xDC33DFBE,        0x0513CD12, 0xC9B9CD8C, 0x4736CA6F, 0x8B9CCAF1,        0x8159C3E8, 0x4DF3C376, 0xC37CC495, 0x0FD6C40B,        0x7AA64737, 0xB60C47A9, 0x3883404A, 0xF42940D4,        0xFEEC49CD, 0x32464953, 0xBCC94EB0, 0x70634E2E,        0xA9435C82, 0x65E95C1C, 0xEB665BFF, 0x27CC5B61,        0x2D095278, 0xE1A352E6, 0x6F2C5505, 0xA386559B,        0x061D761C, 0xCAB77682, 0x44387161, 0x889271FF,        0x825778E6, 0x4EFD7878, 0xC0727F9B, 0x0CD87F05,        0xD5F86DA9, 0x19526D37, 0x97DD6AD4, 0x5B776A4A,        0x51B26353, 0x9D1863CD, 0x1397642E, 0xDF3D64B0,        0x83D02561, 0x4F7A25FF, 0xC1F5221C, 0x0D5F2282,        0x079A2B9B, 0xCB302B05, 0x45BF2CE6, 0x89152C78,        0x50353ED4, 0x9C9F3E4A, 0x121039A9, 0xDEBA3937,        0xD47F302E, 0x18D530B0, 0x965A3753, 0x5AF037CD,        0xFF6B144A, 0x33C114D4, 0xBD4E1337, 0x71E413A9,        0x7B211AB0, 0xB78B1A2E, 0x39041DCD, 0xF5AE1D53,        0x2C8E0FFF, 0xE0240F61, 0x6EAB0882, 0xA201081C,        0xA8C40105, 0x646E019B, 0xEAE10678, 0x264B06E6    }};

#ifdef WORDS_BIGENDIAN#   define A(x) ((x) >> 24)#   define B(x) (((x) >> 16) & 0xFF)#   define C(x) (((x) >> 8) & 0xFF)#   define D(x) ((x) & 0xFF)
#   define S8(x) ((x) << 8)#   define S32(x) ((x) << 32)
#else#   define A(x) ((x) >> 24)#   define B(x) (((x) >> 16) & 0xFF)#   define C(x) (((x) >> 8) & 0xFF)#   define D(x) ((x) & 0xFF)
#   define S8(x) ((x) << 8)#   define S32(x) ((x) << 32)#endif

const uint8_t lzma_header_magic[6] = { 品牌字符串 };

cd xz-5.6.2./configuremake

#define SQUASHFS_MAGIC          0x6563696e#define SQUASHFS_MAGIC_SWAP     0x6e696365

export LD_PRELOAD=/usr/local/lib/liblzma.so./unsquashfs xxx_fs.bin 

某T路由器固件的解压逻辑即将解压逻辑写入linux内核中，在内核系统启动过程中，会将要更新的文件系统解压出来，解压过程有自修改后的文件系统头和xxx_crc32_le等函数校验过程，所以想要直接使用binwalk之类的工具提取固件中的文件系统会失败，要想解压出文件系统需要绕过crc校验函数或者对xz工具中的crc32_fast.c中lzma_crc32函数进行修改。