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Document stuff run before backdoor_setup() #5

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merged 5 commits into from
Apr 10, 2024
Merged

Document stuff run before backdoor_setup() #5

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3ac4f50
Add typedef that is missing in older glibc
ljbade Apr 9, 2024
735c081
Fix up printf format specifiers
ljbade Apr 9, 2024
3ef15a7
Document stuff run before backdoor_setup()
ljbade Apr 10, 2024
10300a6
Document some early functions in backdoor_setup()
ljbade Apr 10, 2024
af361a1
Document the remaining special relocation segments
ljbade Apr 10, 2024
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17 changes: 9 additions & 8 deletions xzre.c
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Original file line number Diff line number Diff line change
Expand Up @@ -92,7 +92,7 @@ void xzre_secret_data_test(){}

static void *get_elf_base(const char *path){
char cmdBuf[128];
char template[] = "grep -E 'r--p 00000000.*%s' /proc/%zu/maps | cut -d '-' -f1";
char template[] = "grep -E 'r--p 00000000.*%s' /proc/%d/maps | cut -d '-' -f1";
snprintf(cmdBuf, sizeof(cmdBuf), template, path, getpid());
FILE *hProc = popen(cmdBuf, "r");
memset(cmdBuf, 0x00, sizeof(cmdBuf));
Expand Down Expand Up @@ -200,7 +200,7 @@ void xzre_backdoor_setup(){
.shared = &shared,
.hook_params = &hook_params
};
printf("pid is %zu\n", getpid());
printf("pid is %d\n", getpid());
//asm volatile("jmp .");
if(!backdoor_setup(&para)){
puts("backdoor_setup() FAIL");
Expand Down Expand Up @@ -233,8 +233,8 @@ void main_shared(){
string_item_t *item = &strings.entries[i];
printf(
"----> %s\n"
"str %2d: id=0x%x, start=%p, end=%p, xref=%p (size: 0x%04lx, xref_offset: 0x%04lx\n"
"RVA_start: %p, RVA_end: %p, RVA_xref: %p\n\n",
"str %2d: id=0x%x, start=%p, end=%p, xref=%p (size: 0x%04zx, xref_offset: 0x%04zx\n"
"RVA_start: 0x%tx, RVA_end: 0x%tx, RVA_xref: 0x%tx\n\n",
StringXrefName[i],
i, item->string_id, item->func_start, item->func_end, item->xref,
(item->func_start && item->func_end) ? PTRDIFF(item->func_end, item->func_start) : 0,
Expand All @@ -258,8 +258,9 @@ int main(int argc, char *argv[]){
if(!res) break;
//hexdump(&ctx, sizeof(ctx));
printf(
"[%2d]: opcode: 0x%08x (orig:0x%08X) (l: %2llu) -- "
"modrm: 0x%02x (%d, %d, %d), operand: %lx, mem_disp: %lx, rex.br: %d, f: %02hhx\n", i,
"[%2d]: opcode: 0x%08"PRIx32" (orig:0x%08"PRIX32") (l: %2"PRIu64") -- "
"modrm: 0x%02"PRIx8" (%"PRId8", %"PRId8", %"PRId8"), operand: %"PRIx64", mem_disp: %"PRIx64", rex.br: %d, f: %02"PRIx8"\n",
i,
XZDASM_OPC(ctx.opcode), ctx.opcode,
ctx.instruction_size,
ctx.modrm, ctx.modrm_mod, ctx.modrm_reg, ctx.modrm_rm,
Expand All @@ -270,7 +271,7 @@ int main(int argc, char *argv[]){
ctx.flags);
printf(" --> ");
for(int i=0; i<ctx.instruction_size; i++){
printf("%02hhx ", ctx.instruction[i]);
printf("%02"PRIx8" ", ctx.instruction[i]);
}
printf("\n");
};
Expand Down Expand Up @@ -325,4 +326,4 @@ uint32_t __attribute__((ifunc("resolver"))) lzma_crc32(const uint8_t *buf, size
uint64_t __attribute__((ifunc("resolver"))) lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc);
#endif

#endif
#endif
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