datautils0/make_kernel_patchfile.c at master · comex/datautils0 · GitHub

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#include<data/common.h>
#include<data/find.h>
#include<data/mach-o/binary.h>
#include<data/mach-o/link.h>
#include"lambda.h"
#include<data/ios-classify.h>

externunsigned charsandbox_armv6_o[], sandbox_armv7_o[];
externunsigned intsandbox_armv6_o_len, sandbox_armv7_o_len;

intpatchfd;

staticinlinevoidpatch_with_range(constchar*name, addr_taddr, prange_tpr) {
uint32_tlen=strlen(name);
write(patchfd, &len, sizeof(len));
write(patchfd, name, len);
write(patchfd, &addr, sizeof(addr));
uint32_tsize=pr.size; // size_t no good
write(patchfd, &size, sizeof(size));
write(patchfd, pr.start, pr.size);
}

#definepatch(name, addr, typeof_to, to...) \
 ({ typeof_to to_[] = to; \
 patch_with_range(name, addr, (prange_t) {&to_[0], sizeof(to_)}); })

addr_tfind_sysctl(structbinary*binary, constchar*name) {
addr_tcs=find_string(b_macho_segrange(binary, "__TEXT"), name, 0, MUST_FIND | TRAILING_ZERO);
addr_tcsref=find_int32(b_macho_segrange(binary, "__DATA"), cs, MUST_FIND);
returnb_read32(binary, csref-8);
}

voiddo_kernel(structbinary*binary, structbinary*sandbox) {
unsigned intclass=classify(binary);

addr_t_PE_i_can_has_debugger, _vn_getpath, _memcmp;

structfindmany*text=findmany_init(b_macho_segrange(binary, "__TEXT"));

_PE_i_can_has_debugger=b_sym(binary, "_PE_i_can_has_debugger", MUST_FIND | TO_EXECUTE);
_vn_getpath=b_sym(binary, "_vn_getpath", MUST_FIND | TO_EXECUTE);
_memcmp=b_sym(binary, "_memcmp", MUST_FIND | TO_EXECUTE);

addr_tvme; findmany_add(&vme, text, spec(_50, "01 f0 - 06 00 06 28",
_armv7, "- 02 0f .. .. 63 08 03 f0 01 05 e3 0a 13 f0 01 03",
_armv6, "- .. .. .. .. .. 08 1e 1c .. 0a 01 22 .. 1c 16 40 .. 40"));
addr_tvmp; findmany_add(&vmp, text, spec(_50, "- 26 f0 04 06 00 20 29 46",
_armv7, "- 25 f0 04 05 .. e7 92 45 98 bf 02 99 .. d8",
_armv6, "?"));

// this function checks the baked list of hashes
addr_tmystery=find_data(b_macho_segrange(binary, "__PRELINK_TEXT"), spec(_50, "- f0 b5 03 af 2d e9 00 05 04 46 .. .. 14 f8 01 0b 4f f0 13 0c",
_43, "- f0 b5 03 af 4d f8 04 8d .. .. 03 78 80 46",
_armv7, "- 90 b5 01 af 14 29 .. .. .. .. 90 f8 00 c0",
_armv6, "?"),
0, MUST_FIND);
addr_tdei; findmany_add(&dei, text, spec(_50, "24 bf 04 22 01 92 00 98 .. .. -",
_armv7, "04 22 01 92 00 98 .. 49 -",
_armv6, "?"));
addr_ttfp0; findmany_add(&tfp0, text, spec(_50, "91 e8 01 04 d1 f8 08 80 00 21 02 91 ba f1 00 0f 01 91 - 06 d1 02 a8",
_armv7, "85 68 00 23 .. 93 .. 93 - 5c b9 02 a8 29 46 04 22",
_armv6, "85 68 .. 93 .. 93 - 00 2c 0b d1"));
addr_tcsedp; findmany_add(&csedp, text, spec(_50, "df f8 88 33 1d ee 90 0f a2 6a - 1b 68",
_43, "1d ee 90 3f d3 f8 80 33 93 f8 94 30 1b 09 03 f0 01 02 + .. .. .. ..",
_armv7, "1d ee 90 3f d3 f8 4c 33 d3 f8 9c 20 + .. .. .. .. 19 68 00 29",
_armv6, "9c 22 03 59 99 58 + .. .. 1a 68 00 2a"));
addr_tpower=0; if(class >= _43) power=find_data(b_macho_segrange(binary, "__PRELINK_TEXT"),
spec(_50, "- 32 20 00 21 20 22",
_43, "- 32 20 98 47 .. 68"),
0, MUST_FIND);

findmany_go(text);


// vm_map_enter (patch1) - allow RWX pages
patch("vm_map_enter", vme, uint32_t, {spec(_50, 0x28080006,
_armv7, 0x46c00f02,
_armv6, 0x46c046c0)});
// vm_map_protect - allow vm_protect etc. to create RWX pages
patch("vm_map_protect", vmp, uint32_t, {spec(_armv7, 0x46c046c0,
_armv6, 42)});
// AMFI (patch3) - disable the predefined list of executable stuff
patch("AMFI", mystery, uint32_t, {spec(_armv7, 0x47702001,
_armv6, 0xe3a00001)});
// PE_i_can_has_debugger (patch4) - so AMFI allows non-ldid'd binaries (and some other stuff is allowed)
// switching to patching the actual thing, and the startup code
// why? debug_enabled is used directly in kdp, and I was not emulating PE_i_can_has's behavior correctly anyway
patch("+debug_enabled", resolve_ldr(binary, _PE_i_can_has_debugger+2), uint32_t, {1});
patch("-debug_enabled initializer", dei, uint32_t, {spec(_armv7, 0x60082001,
_armv6, 42)});
// task_for_pid 0
// this choice of patch was necessary so that a reboot wasn't required after
// using the screwed up version from jailbreakme 2.0; no reason to change it
patch("task_for_pid 0", tfp0, uint32_t, {spec(_50, 0xa802e006,
_armv7, 0xa802e00b,
_armv6, 0xe00b2c00)});
if(class >= _50) {
// it moved into BSS?
patch("cs_enforcement_disable check", csedp, uint16_t, {0x2301});
 } else {
patch("cs_enforcement_disable", resolve_ldr(binary, csedp), uint32_t, {1});
 }

addr_tscratch=resolve_ldr(binary, spec(_50, mystery+11,
_armv7, mystery+9,
_armv6, 42));
scratch= (scratch+3) & ~3;

// patches

patch("proc_enforce",
find_sysctl(binary, "proc_enforce"),
uint32_t, {0});

/*patch("vnode_enforce",
 find_sysctl(binary, "vnode_enforce"),
 uint32_t, {0});*/

if(class >= _43) {
// br0x's camera kit patch
patch("USB power", power, uint8_t, {0xfa});
 }

// sandbox
range_trange=b_macho_segrange(binary, "__PRELINK_TEXT");
addr_tsb_evaluate=find_bof(range, find_int32(range, find_string(range, "bad opcode", 0, MUST_FIND | TRAILING_ZERO), MUST_FIND), class >= _armv7) & ~1;

DECL_LAMBDA(l, addr_t, (constchar*name), {
if(!strcmp(name, "c_sb_evaluate_orig1")) returnb_read32(binary, sb_evaluate);
if(!strcmp(name, "c_sb_evaluate_orig2")) returnb_read32(binary, sb_evaluate+4);
if(!strcmp(name, "c_sb_evaluate_orig3")) returnb_read32(binary, sb_evaluate+8);
if(!strcmp(name, "c_sb_evaluate_orig4")) returnb_read32(binary, sb_evaluate+12);
if(!strcmp(name, "c_sb_evaluate_jumpto")) returnsb_evaluate+spec(_armv7, 17,
_armv6, 16);

if(!strcmp(name, "c_memcmp")) return_memcmp;
if(!strcmp(name, "c_vn_getpath")) return_vn_getpath;
die("? %s", name);
 });
b_relocate(sandbox, binary, RELOC_DEFAULT, l.func, l.arg, 0);

prange_tsandbox_pr=rangeconv_off(sandbox->segments[0].file_range, MUST_FIND);
store_file(sandbox_pr, "/tmp/wtf.o", 0644);
patch_with_range("sb_evaluate hook",
scratch,
sandbox_pr);

patch("sb_evaluate",
sb_evaluate,
uint32_t, {spec(_armv7, 0xf000f8df,
_armv6, 0xe51ff004),
scratch | 1});

#ifndef__arm__
// this is not a real patch but the address is included for something else to use
patch("scratch", 0, uint32_t, {(scratch+sandbox_pr.size+0xfff) & ~0xfff});
#endif

}


intmain(intargc, char**argv) {
 (void) argc;
structbinarykernel, sandbox;
b_init(&kernel);
b_init(&sandbox);
b_load_macho(&kernel, argv[1]);
b_prange_load_macho(&sandbox, kernel.cpusubtype==9 ? (prange_t) {sandbox_armv7_o, sandbox_armv7_o_len} : (prange_t) {sandbox_armv6_o, sandbox_armv6_o_len}, 0, "sandbox.o");

patchfd=open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0644);
if(patchfd==-1) {
edie("could not open patchfd");
 }

do_kernel(&kernel, &sandbox);

close(patchfd);
return0;
}