nganhkhoa/ios-kernel-patch
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work around an issue caused because I am an idiot

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This commit is contained in:
comex 2011-12-21 19:06:43 -08:00
parent a234e43a6a
commit abb0793b63
1 changed files with 23 additions and 14 deletions
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37
make_kernel_patchfile.c
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@ -30,6 +30,25 @@ addr_t find_sysctl(struct binary *binary, const char *name) {
return b_read32(binary, csref - 8);
}
static addr_t sandbox_lookup_sym(const struct binary *binary, const char *name) {
// this is stupid
addr_t _memcmp = binary->reserved[0],
_vn_getpath = binary->reserved[1],
sb_evaluate = binary->reserved[2];
unsigned int class = classify(binary);
if(!strcmp(name, "c_sb_evaluate_orig1")) return b_read32(binary, sb_evaluate);
if(!strcmp(name, "c_sb_evaluate_orig2")) return b_read32(binary, sb_evaluate + 4);
if(!strcmp(name, "c_sb_evaluate_orig3")) return b_read32(binary, sb_evaluate + 8);
if(!strcmp(name, "c_sb_evaluate_orig4")) return b_read32(binary, sb_evaluate + 12);
if(!strcmp(name, "c_sb_evaluate_jumpto")) return sb_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);
}
void do_kernel(struct binary *binary, struct binary *sandbox) {
unsigned int class = classify(binary);
@ -125,20 +144,10 @@ void do_kernel(struct binary *binary, struct binary *sandbox) {
range_t range = b_macho_segrange(binary, "__PRELINK_TEXT");
addr_t sb_evaluate = find_bof(range, find_int32(range, find_string(range, "bad opcode", 0, MUST_FIND), MUST_FIND), class >= _armv7) & ~1;
DECL_LAMBDA(l, uint32_t, (const char *name), {
if(!strcmp(name, "c_sb_evaluate_orig1")) return b_read32(binary, sb_evaluate);
if(!strcmp(name, "c_sb_evaluate_orig2")) return b_read32(binary, sb_evaluate + 4);
if(!strcmp(name, "c_sb_evaluate_orig3")) return b_read32(binary, sb_evaluate + 8);
if(!strcmp(name, "c_sb_evaluate_orig4")) return b_read32(binary, sb_evaluate + 12);
if(!strcmp(name, "c_sb_evaluate_jumpto")) return sb_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, (void *) l.arg, RELOC_DEFAULT, (void *) l.func, 0);
binary->reserved[0] = _memcmp;
binary->reserved[1] = _vn_getpath;
binary->reserved[2] = sb_evaluate;
b_relocate(sandbox, binary, RELOC_DEFAULT, sandbox_lookup_sym, 0);
prange_t sandbox_pr = rangeconv_off(sandbox->segments[0].file_range, MUST_FIND);
store_file(sandbox_pr, "/tmp/wtf.o", 0644);
patch_with_range("sb_evaluate hook",