198 lines
8.1 KiB
C
198 lines
8.1 KiB
C
#include <data/common.h>
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#include <data/find.h>
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#include <data/binary.h>
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#include <data/link.h>
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#include "lambda.h"
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extern unsigned char sandbox_o[];
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extern unsigned int sandbox_o_len;
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int patchfd;
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static inline void patch_with_range(const char *name, addr_t addr, prange_t pr) {
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uint32_t len = strlen(name);
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write(patchfd, &len, sizeof(len));
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write(patchfd, name, len);
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write(patchfd, &addr, sizeof(addr));
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uint32_t size = pr.size; // size_t no good
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write(patchfd, &size, sizeof(size));
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write(patchfd, pr.start, pr.size);
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}
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#define patch(name, addr, typeof_to, to...) \
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({ typeof_to to_[] = to; \
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patch_with_range(name, addr, (prange_t) {&to_[0], sizeof(to_)}); })
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uint32_t find_dvp_struct_offset(struct binary *binary) {
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bool is_armv7 = binary->actual_cpusubtype == 9;
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range_t range = b_macho_segrange(binary, "__PRELINK_TEXT");
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addr_t derive_vnode_path = find_bof(range, find_int32(range, find_string(range, "path", 0, true), true), is_armv7);
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uint8_t byte = b_read8(binary, find_data((range_t){binary, derive_vnode_path, 1024}, !is_armv7 ? "00 00 50 e3 02 30 a0 11 - .. 00 94 e5" : "- .. 69 6a 46", 0, true));
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if(is_armv7) {
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return (4 | (byte >> 6)) << 2;
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} else {
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return byte;
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}
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}
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addr_t find_scratch(struct binary *binary) {
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range_t range = b_macho_segrange(binary, "__PRELINK_TEXT");
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prange_t pr = rangeconv(range);
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for(size_t o = 0; o < pr.size - 0x1000; o += 4) {
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for(size_t p = 0; p < 0x1000; p++) {
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uint8_t c = ((char *) pr.start)[o + p];
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if(!((p != 0 && c == 0) || c == 0x14)) goto nope;
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}
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return range.start + o;
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nope:;
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}
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die("didn't find scratch");
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}
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addr_t find_sysctl(struct binary *binary, const char *name) {
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addr_t cs = find_string(b_macho_segrange(binary, "__TEXT"), name, 0, true);
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addr_t csref = find_int32(b_macho_segrange(binary, "__DATA"), cs, true);
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return b_read32(binary, csref - 8);
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}
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void do_kernel(struct binary *binary, struct binary *sandbox) {
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bool is_armv7 = binary->actual_cpusubtype == 9;
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addr_t _kernel_pmap, _PE_i_can_has_debugger, _vn_getpath, _memcmp;
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if(0) {
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_kernel_pmap = 0x8027e2dc;
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_PE_i_can_has_debugger = 0x80203f75;
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_vn_getpath = 0x8008d7bd;
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_memcmp = 0x8006558d;
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} else {
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_kernel_pmap = b_sym(binary, "_kernel_pmap", false, true);
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_PE_i_can_has_debugger = b_sym(binary, "_PE_i_can_has_debugger", true, true);
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_vn_getpath = b_sym(binary, "_vn_getpath", true, true);
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_memcmp = b_sym(binary, "_memcmp", true, true);
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}
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// '+' = in place only, '-' = in advance only
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// patches
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patch("+kernel_pmap.nx_enabled",
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b_read32(binary, _kernel_pmap) + 0x420,
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uint32_t, {0});
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// the second ref to mem_size
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bool four_dot_three;
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{
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addr_t nxe = find_data(b_macho_segrange(binary, "__TEXT"), "23 68 - c3 f8 24 84", 0, false);
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four_dot_three = nxe;
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if(nxe) {
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patch("-kernel_pmap.nx_enabled initializer",
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nxe,
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uint32_t, {0x6424f8c3});
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} else {
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patch("-kernel_pmap.nx_enabled initializer",
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find_data(b_macho_segrange(binary, "__TEXT"), is_armv7 ? "03 68 - c3 f8 20 24" : "84 23 db 00 - d5 50 22 68", 0, true),
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uint32_t, {is_armv7 ? 0xc420f8c3 : 0x682250d0});
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}
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}
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patch("-lunchd",
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find_string(b_macho_segrange(binary, "__DATA"), "/sbin/launchd", 0, true),
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char, "/sbin/lunchd");
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// vm_map_enter (patch1) - allow RWX pages
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patch("vm_map_enter",
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find_data(b_macho_segrange(binary, "__TEXT"), is_armv7 ? "- 02 0f .. .. 63 08 03 f0 01 05 e3 0a 13 f0 01 03" : "- .. .. .. .. .. 08 1e 1c .. 0a 01 22 .. 1c 16 40 .. 40", 0, true),
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uint32_t, {is_armv7 ? 0x46c00f02 : 0x46c046c0});
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// vm_map_protect - allow vm_protect etc. to create RWX pages
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patch("vm_map_protect",
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find_data(b_macho_segrange(binary, "__TEXT"), is_armv7 ? "- 25 f0 04 05 .. e7 92 45 98 bf 02 99 .. d8" : "?", 0, true),
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uint32_t, {0x0500f025});
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// AMFI (patch3) - disable the predefined list of executable stuff
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// safe because it follows longs
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addr_t mystery = find_data(b_macho_segrange(binary, "__PRELINK_TEXT"), four_dot_three ? "- f0 b5 03 af 4d f8 04 8d .. .. 03 78 80 46" : is_armv7 ? "- 90 b5 01 af 14 29 .. .. .. .. 90 f8 00 c0" : "???", 0, true);
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addr_t scratch = resolve_ldr(binary, is_armv7 ? (mystery + 9) : 42);
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patch("AMFI", mystery, uint32_t, {is_armv7 ? 0x47702001 : 0xe3a00001});
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// PE_i_can_has_debugger (patch4) - so AMFI allows non-ldid'd binaries (and some other stuff is allowed)
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// switching to patching the actual thing, and the startup code
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// why? debug_enabled is used directly in kdp, and I was not emulating PE_i_can_has's behavior correctly anyway
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patch("+debug_enabled",
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resolve_ldr(binary, _PE_i_can_has_debugger + 2),
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uint32_t, {1});
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patch("-debug_enabled initializer",
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find_data(b_macho_segrange(binary, "__TEXT"), is_armv7 ? "04 22 01 92 00 98 .. 49 -" : "?", 0, true),
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uint32_t, {0x60082001}); // mov r0, #1; str r0, [r1]
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// task_for_pid 0
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// this is necessary so a reboot isn't required after using the screwed up version
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patch("task_for_pid 0",
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find_data(b_macho_segrange(binary, "__TEXT"), is_armv7 ? "85 68 00 23 .. 93 .. 93 - 5c b9 02 a8 29 46 04 22" : "85 68 .. 93 .. 93 - 00 2c 0b d1", 0, true),
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uint32_t, {is_armv7 ? 0xa802e00b : 0xe00b2c00});
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// cs_enforcement_disable
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patch("cs_enforcement_disable",
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resolve_ldr(binary, find_data(b_macho_segrange(binary, "__TEXT"), four_dot_three ? "1d ee 90 3f d3 f8 80 33 93 f8 94 30 1b 09 03 f0 01 02 + .. .. .. .." : is_armv7 ? "1d ee 90 3f d3 f8 4c 33 d3 f8 9c 20 + .. .. .. .. 19 68 00 29" : "9c 22 03 59 99 58 + .. .. 1a 68 00 2a", 0, true)),
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uint32_t, {1});
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// sandbox
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range_t range = b_macho_segrange(binary, "__PRELINK_TEXT");
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addr_t sb_evaluate = find_bof(range, find_int32(range, find_string(range, "bad opcode", false, true), true), is_armv7);
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DECL_LAMBDA(l, uint32_t, (const char *name), {
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if(!strcmp(name, "c_sb_evaluate_orig1")) return b_read32(binary, sb_evaluate);
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if(!strcmp(name, "c_sb_evaluate_orig2")) return b_read32(binary, sb_evaluate + 4);
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if(!strcmp(name, "c_sb_evaluate_jumpto")) return sb_evaluate + (is_armv7 ? 9 : 8);
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if(!strcmp(name, "c_memcmp")) return _memcmp;
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if(!strcmp(name, "c_vn_getpath")) return _vn_getpath;
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if(!strcmp(name, "c_dvp_struct_offset")) return find_dvp_struct_offset(binary);
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if(!strcmp(name, "c_is_armv7")) return is_armv7;
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die("? %s", name);
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})
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b_relocate(sandbox, (void *) l.arg, (void *) l.func, 0);
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prange_t sandbox_pr = rangeconv(b_nth_segment(sandbox, 0));
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patch_with_range("sb_evaluate hook",
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scratch,
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sandbox_pr);
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patch("sb_evaluate",
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sb_evaluate,
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uint32_t, {(is_armv7 ? 0xf000f8df : 0xe51ff004), scratch | 1});
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patch("proc_enforce",
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find_sysctl(binary, "proc_enforce"),
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uint32_t, {0});
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// some "notes"
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addr_t sysent = find_data(b_macho_segrange(binary, "__DATA"), "21 00 00 00 00 10 86 00 -", 0, true);
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addr_t sysent_patch_orig = b_read32(binary, sysent + 4);
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patch("sysent patch", 0, uint32_t, {sysent + 4});
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patch("sysent patch orig", 0, uint32_t, {sysent_patch_orig});
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patch("scratch", 0, uint32_t, {(scratch + sandbox_pr.size + 0xfff) & ~0xfff});
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//patch("IOLog", 0, uint32_t, {b_sym(binary, "_IOLog", true, true)});*/
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}
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int main(int argc, char **argv) {
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(void) argc;
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struct binary kernel, sandbox;
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b_init(&kernel);
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b_init(&sandbox);
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b_load_macho(&kernel, argv[1], false);
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b_prange_load_macho(&sandbox, (prange_t) {&sandbox_o, sandbox_o_len}, "sandbox.o");
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patchfd = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0644);
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if(patchfd == -1) {
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edie("could not open patchfd");
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}
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do_kernel(&kernel, &sandbox);
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close(patchfd);
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return 0;
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}
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