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limits ok

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CrazyRedMachine 2024-06-17 23:11:04 +02:00
parent 4c0000870e
commit a28dcbd882
1 changed files with 59 additions and 47 deletions
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106
popnhax/omnimix_patch.cc
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@ -74,7 +74,7 @@ uint32_t *find_binary_xref(char *data, DWORD dllSize, const char *search_pattern
} }
uint32_t get_table_size_by_xref(char *data, DWORD dllSize, uint32_t *ea, uint32_t entry_size) uint32_t get_table_size_by_xref(char *data, DWORD data_size, uint32_t *ea, uint32_t entry_size)
{ {
fprintf(stderr, "get table size by xref\n"); fprintf(stderr, "get table size by xref\n");
uint32_t *orig_ea = ea; uint32_t *orig_ea = ea;
@ -86,27 +86,26 @@ uint32_t get_table_size_by_xref(char *data, DWORD dllSize, uint32_t *ea, uint32_
while (!found) while (!found)
{ {
uint32_t curr_limit = (((uint32_t)ea)-((uint32_t)orig_ea))/entry_size;
uint32_t *as_int = (uint32_t*)&ea; uint32_t *as_int = (uint32_t*)&ea;
//fprintf(stderr, "looking for xref to %0X\n", *as_int); //fprintf(stderr, "limit candidate %u, looking for xref to %0X\n", curr_limit, *as_int);
if ( bst_search(g_xref_bst, *as_int) != NULL ) if ( bst_search(g_xref_bst, *as_int) != NULL )
{ {
//fprintf(stderr, "found .text XREF in BST\n");
found=true; found=true;
} } else {
/* uint32_t *xref = find_binary(data, dllSize, as_hex, 4, 0, 0); //look for Xref in data section
if ( xref != NULL ) char *as_hex = (char*)&ea;
{ uint32_t *xref = find_binary(data, data_size, as_hex, 4, 0, 0);
fprintf(stderr, "found at addr %p\n", xref); if ( xref != NULL )
if ( xref != (uint32_t*)0x10169236 )
{ {
found = true; //fprintf(stderr, "found .data XREF at addr %p\n", xref);
} found = true;
else
{
fprintf(stderr, "bad offset\n");
} }
} }
*/
if (!found) if (!found)
ea = (uint32_t*)((uint32_t)ea+entry_size); ea = (uint32_t*)((uint32_t)ea+entry_size);
} }
@ -115,25 +114,6 @@ uint32_t get_table_size_by_xref(char *data, DWORD dllSize, uint32_t *ea, uint32_
return (((uint32_t)ea)-((uint32_t)orig_ea))/entry_size; return (((uint32_t)ea)-((uint32_t)orig_ea))/entry_size;
} }
/*
def get_table_size_by_xref(ea, entry_size):
# Skip 10 entries because why not. We're looking for the end anyway
orig_ea = ea
ea += entry_size * 10
found_end = False
while not found_end:
for xref_idx, xref in enumerate(idautils.XrefsTo(ea)):
found_end = True
break
if not found_end:
ea += entry_size
return (ea - orig_ea) // entry_size
*/
void print_cb(x86_insn_t *insn, void *arg) void print_cb(x86_insn_t *insn, void *arg)
{ {
char line[LINE_SIZE]; /* buffer of line to print */ char line[LINE_SIZE]; /* buffer of line to print */
@ -146,7 +126,7 @@ static void add_xref_to_bst(uint32_t addr)
if ( bst_search(g_xref_bst, addr) == NULL ) if ( bst_search(g_xref_bst, addr) == NULL )
{ {
//LOG("added addr %0X to BST\n", addr); //LOG("added addr %0X to BST\n", addr);
g_xref_bst = bst_insert(g_xref_bst, addr); g_xref_bst = bst_insert(g_xref_bst, addr);
} }
} }
@ -200,16 +180,48 @@ bool make_omnimix_patch(const char *dllFilename){
DWORD dllSize = 0; DWORD dllSize = 0;
char *buf = getDllData(dllFilename, &dllSize); char *buf = getDllData(dllFilename, &dllSize);
/*
const char *dummy_buf = "\x8b\x0c\x95\xfc\x28\x32\x10";
DWORD dummy_size = 7;
*/
/* build instruction table indexed by parameter */
LOG("START DISASSEMBLY\n");
x86_init(opt_none, NULL, NULL); char *text = NULL;
DWORD text_size = 0;
unsigned int num_insn = x86_disasm_range( (unsigned char *)buf, (uint32_t) buf, 0, dllSize, &add_xref, NULL); char *data = NULL;
DWORD data_size = 0;
char *rdata = NULL;
DWORD rdata_size = 0;
PIMAGE_NT_HEADERS headers = (PIMAGE_NT_HEADERS)(buf + ((PIMAGE_DOS_HEADER)buf)->e_lfanew);
PIMAGE_SECTION_HEADER section_header = IMAGE_FIRST_SECTION(headers);
for (WORD SectionIndex = 0; SectionIndex < headers->FileHeader.NumberOfSections; SectionIndex++)
{
PIMAGE_SECTION_HEADER curr_header = &section_header[SectionIndex];
if ( strcmp( (const char*)curr_header->Name, ".text" ) == 0 || curr_header->Characteristics & IMAGE_SCN_CNT_CODE )
{
text = (char*) ((int64_t)buf + curr_header->VirtualAddress);
text_size = curr_header->Misc.VirtualSize;
}
if ( strcmp( (const char*)curr_header->Name, ".data" ) == 0 )
{
data = (char*) ((int64_t)buf + curr_header->VirtualAddress);
data_size = curr_header->Misc.VirtualSize;
}
if ( strcmp( (const char*)curr_header->Name, ".rdata" ) == 0 )
{
rdata = (char*) ((int64_t)buf + curr_header->VirtualAddress);
rdata_size = curr_header->Misc.VirtualSize;
}
}
LOG("buf addr is %p\n", buf);
LOG("text section size %lX, addr %p, beginning %02X %02X %02X %02X\n", text_size, text, text[0], text[1], text[2], text[3]);
LOG("data section size %lX, addr %p, beginning %02X %02X %02X %02X\n", data_size, data, data[0], data[1], data[2], data[3]);
LOG("rdata section size %lX, addr %p, beginning %02X %02X %02X %02X\n", rdata_size, rdata, rdata[0], rdata[1], rdata[2], rdata[3]);
// disassemble .text section and add all xrefs to our BST
LOG("START DISASSEMBLY\n");
x86_init(opt_none, NULL, NULL);
unsigned int num_insn = x86_disasm_range( (unsigned char *)text, (uint32_t) buf, 0, text_size, &add_xref, NULL);
LOG("parsed %u instructions\n", num_insn); LOG("parsed %u instructions\n", num_insn);
LOG("END DISASSEMBLY\n"); LOG("END DISASSEMBLY\n");
@ -243,11 +255,11 @@ g_tables[FLAVOR_IDX].size = 0x60;
g_tables[CHARA_IDX].size = 0x4C; g_tables[CHARA_IDX].size = 0x4C;
// buffer_addr + (buffer_entry_size * limit) should give you the very end of the array (after the last entry) // buffer_addr + (buffer_entry_size * limit) should give you the very end of the array (after the last entry)
g_tables[MUSIC_IDX].limit = get_table_size_by_xref(buf, dllSize, g_tables[MUSIC_IDX].addr, g_tables[MUSIC_IDX].size); g_tables[MUSIC_IDX].limit = get_table_size_by_xref(data, data_size, g_tables[MUSIC_IDX].addr, g_tables[MUSIC_IDX].size);
g_tables[CHART_IDX].limit = get_table_size_by_xref(buf, dllSize, g_tables[CHART_IDX].addr, g_tables[CHART_IDX].size); g_tables[CHART_IDX].limit = get_table_size_by_xref(data, data_size, g_tables[CHART_IDX].addr, g_tables[CHART_IDX].size);
g_tables[STYLE_IDX].limit = get_table_size_by_xref(buf, dllSize, g_tables[STYLE_IDX].addr, g_tables[STYLE_IDX].size); g_tables[STYLE_IDX].limit = get_table_size_by_xref(data, data_size, g_tables[STYLE_IDX].addr, g_tables[STYLE_IDX].size);
g_tables[FLAVOR_IDX].limit = get_table_size_by_xref(buf, dllSize, g_tables[FLAVOR_IDX].addr, g_tables[FLAVOR_IDX].size); g_tables[FLAVOR_IDX].limit = get_table_size_by_xref(data, data_size, g_tables[FLAVOR_IDX].addr, g_tables[FLAVOR_IDX].size);
g_tables[CHARA_IDX].limit = get_table_size_by_xref(buf, dllSize, g_tables[CHARA_IDX].addr, g_tables[CHARA_IDX].size); g_tables[CHARA_IDX].limit = get_table_size_by_xref(data, data_size, g_tables[CHARA_IDX].addr, g_tables[CHARA_IDX].size);
/* /*
# Modify the entry sizes as required # Modify the entry sizes as required