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#include "frida-gum.h"
#include "debug.h"
#include "cmplog.h"
#include "complog.h"
#include "util.h"
#if defined(__x86_64__)
#define X86_REG_8L(LABEL, REG) \
case LABEL: { \
\
return REG & GUM_INT8_MASK; \
\
}
#define X86_REG_8H(LABEL, REG) \
case LABEL: { \
\
return (REG & GUM_INT16_MASK) >> 8; \
\
}
#define X86_REG_16(LABEL, REG) \
case LABEL: { \
\
return (REG & GUM_INT16_MASK); \
\
}
#define X86_REG_32(LABEL, REG) \
case LABEL: { \
\
return (REG & GUM_INT32_MASK); \
\
}
#define X86_REG_64(LABEL, REG) \
case LABEL: { \
\
return (REG); \
\
}
typedef struct {
x86_op_type type;
uint8_t size;
union {
x86_op_mem mem;
x86_reg reg;
int64_t imm;
};
} complog_ctx_t;
typedef struct {
complog_ctx_t operand1;
complog_ctx_t operand2;
} complog_pair_ctx_t;
static guint64 complog_read_reg(GumX64CpuContext *ctx, x86_reg reg) {
switch (reg) {
X86_REG_8L(X86_REG_AL, ctx->rax)
X86_REG_8L(X86_REG_BL, ctx->rbx)
X86_REG_8L(X86_REG_CL, ctx->rcx)
X86_REG_8L(X86_REG_DL, ctx->rdx)
X86_REG_8L(X86_REG_BPL, ctx->rbp)
X86_REG_8L(X86_REG_SIL, ctx->rsi)
X86_REG_8L(X86_REG_DIL, ctx->rdi)
X86_REG_8H(X86_REG_AH, ctx->rax)
X86_REG_8H(X86_REG_BH, ctx->rbx)
X86_REG_8H(X86_REG_CH, ctx->rcx)
X86_REG_8H(X86_REG_DH, ctx->rdx)
X86_REG_16(X86_REG_AX, ctx->rax)
X86_REG_16(X86_REG_BX, ctx->rbx)
X86_REG_16(X86_REG_CX, ctx->rcx)
X86_REG_16(X86_REG_DX, ctx->rdx)
X86_REG_16(X86_REG_DI, ctx->rdi)
X86_REG_16(X86_REG_SI, ctx->rsi)
X86_REG_16(X86_REG_BP, ctx->rbp)
X86_REG_32(X86_REG_EAX, ctx->rax)
X86_REG_32(X86_REG_ECX, ctx->rcx)
X86_REG_32(X86_REG_EDX, ctx->rdx)
X86_REG_32(X86_REG_EBX, ctx->rbx)
X86_REG_32(X86_REG_ESP, ctx->rsp)
X86_REG_32(X86_REG_EBP, ctx->rbp)
X86_REG_32(X86_REG_ESI, ctx->rsi)
X86_REG_32(X86_REG_EDI, ctx->rdi)
X86_REG_32(X86_REG_R8D, ctx->r8)
X86_REG_32(X86_REG_R9D, ctx->r9)
X86_REG_32(X86_REG_R10D, ctx->r10)
X86_REG_32(X86_REG_R11D, ctx->r11)
X86_REG_32(X86_REG_R12D, ctx->r12)
X86_REG_32(X86_REG_R13D, ctx->r13)
X86_REG_32(X86_REG_R14D, ctx->r14)
X86_REG_32(X86_REG_R15D, ctx->r15)
X86_REG_32(X86_REG_EIP, ctx->rip)
X86_REG_64(X86_REG_RAX, ctx->rax)
X86_REG_64(X86_REG_RCX, ctx->rcx)
X86_REG_64(X86_REG_RDX, ctx->rdx)
X86_REG_64(X86_REG_RBX, ctx->rbx)
X86_REG_64(X86_REG_RSP, ctx->rsp)
X86_REG_64(X86_REG_RBP, ctx->rbp)
X86_REG_64(X86_REG_RSI, ctx->rsi)
X86_REG_64(X86_REG_RDI, ctx->rdi)
X86_REG_64(X86_REG_R8, ctx->r8)
X86_REG_64(X86_REG_R9, ctx->r9)
X86_REG_64(X86_REG_R10, ctx->r10)
X86_REG_64(X86_REG_R11, ctx->r11)
X86_REG_64(X86_REG_R12, ctx->r12)
X86_REG_64(X86_REG_R13, ctx->r13)
X86_REG_64(X86_REG_R14, ctx->r14)
X86_REG_64(X86_REG_R15, ctx->r15)
X86_REG_64(X86_REG_RIP, ctx->rip)
default:
FATAL("Failed to read register: %d", reg);
return 0;
}
}
static guint64 complog_read_mem(GumX64CpuContext *ctx, x86_op_mem *mem) {
guint64 base = 0;
guint64 index = 0;
guint64 address;
if (mem->base != X86_REG_INVALID) base = complog_read_reg(ctx, mem->base);
if (mem->index != X86_REG_INVALID) index = complog_read_reg(ctx, mem->index);
address = base + (index * mem->scale) + mem->disp;
return address;
}
static guint64 cmplog_get_operand_value(GumCpuContext *context,
complog_ctx_t *ctx) {
switch (ctx->type) {
case X86_OP_REG:
return complog_read_reg(context, ctx->reg);
case X86_OP_IMM:
return ctx->imm;
case X86_OP_MEM:
return complog_read_mem(context, &ctx->mem);
default:
FATAL("Invalid operand type: %d\n", ctx->type);
}
}
static void complog_call_callout(GumCpuContext *context, gpointer user_data) {
UNUSED_PARAMETER(user_data);
guint64 address = complog_read_reg(context, X86_REG_RIP);
guint64 rdi = complog_read_reg(context, X86_REG_RDI);
guint64 rsi = complog_read_reg(context, X86_REG_RSI);
void *ptr1 = GSIZE_TO_POINTER(rdi);
void *ptr2 = GSIZE_TO_POINTER(rsi);
if (!complog_is_readable(ptr1, 32) || !complog_is_readable(ptr2, 32)) return;
uintptr_t k = address;
k = (k >> 4) ^ (k << 8);
k &= CMP_MAP_W - 1;
__afl_cmp_map->headers[k].type = CMP_TYPE_RTN;
u32 hits = __afl_cmp_map->headers[k].hits;
__afl_cmp_map->headers[k].hits = hits + 1;
__afl_cmp_map->headers[k].shape = 31;
hits &= CMP_MAP_RTN_H - 1;
gum_memcpy(((struct cmpfn_operands *)__afl_cmp_map->log[k])[hits].v0, ptr1,
32);
gum_memcpy(((struct cmpfn_operands *)__afl_cmp_map->log[k])[hits].v1, ptr2,
32);
}
static void complog_instrument_put_operand(complog_ctx_t *ctx,
cs_x86_op * operand) {
ctx->type = operand->type;
ctx->size = operand->size;
switch (operand->type) {
case X86_OP_REG:
gum_memcpy(&ctx->reg, &operand->reg, sizeof(x86_reg));
break;
case X86_OP_IMM:
gum_memcpy(&ctx->imm, &operand->imm, sizeof(int64_t));
break;
case X86_OP_MEM:
gum_memcpy(&ctx->mem, &operand->mem, sizeof(x86_op_mem));
break;
default:
FATAL("Invalid operand type: %d\n", operand->type);
}
}
static void complog_instrument_call_put_callout(GumStalkerIterator *iterator,
cs_x86_op * operand) {
complog_ctx_t *ctx = g_malloc(sizeof(complog_ctx_t));
if (ctx == NULL) return;
complog_instrument_put_operand(ctx, operand);
gum_stalker_iterator_put_callout(iterator, complog_call_callout, ctx, g_free);
}
static void complog_instrument_call(const cs_insn * instr,
GumStalkerIterator *iterator) {
cs_x86 x86 = instr->detail->x86;
cs_x86_op *operand;
if (instr->id != X86_INS_CALL) return;
if (x86.op_count != 1) return;
operand = &x86.operands[0];
if (operand->type == X86_OP_INVALID) return;
if (operand->type == X86_OP_MEM && operand->mem.segment != X86_REG_INVALID)
return;
complog_instrument_call_put_callout(iterator, operand);
}
static void complog_handle_cmp_sub(GumCpuContext *context, guint64 operand1,
guint64 operand2, uint8_t size) {
guint64 address = complog_read_reg(context, X86_REG_RIP);
register uintptr_t k = (uintptr_t)address;
k = (k >> 4) ^ (k << 8);
k &= CMP_MAP_W - 1;
__afl_cmp_map->headers[k].type = CMP_TYPE_INS;
u32 hits = __afl_cmp_map->headers[k].hits;
__afl_cmp_map->headers[k].hits = hits + 1;
__afl_cmp_map->headers[k].shape = (size - 1);
hits &= CMP_MAP_H - 1;
__afl_cmp_map->log[k][hits].v0 = operand1;
__afl_cmp_map->log[k][hits].v1 = operand2;
}
static void complog_cmp_sub_callout(GumCpuContext *context,
gpointer user_data) {
complog_pair_ctx_t *ctx = (complog_pair_ctx_t *)user_data;
if (ctx->operand1.size != ctx->operand2.size) FATAL("Operand size mismatch");
guint64 operand1 = cmplog_get_operand_value(context, &ctx->operand1);
guint64 operand2 = cmplog_get_operand_value(context, &ctx->operand2);
complog_handle_cmp_sub(context, operand1, operand2, ctx->operand1.size);
}
static void complog_instrument_cmp_sub_put_callout(GumStalkerIterator *iterator,
cs_x86_op * operand1,
cs_x86_op *operand2) {
complog_pair_ctx_t *ctx = g_malloc(sizeof(complog_pair_ctx_t));
if (ctx == NULL) return;
complog_instrument_put_operand(&ctx->operand1, operand1);
complog_instrument_put_operand(&ctx->operand2, operand2);
gum_stalker_iterator_put_callout(iterator, complog_cmp_sub_callout, ctx,
g_free);
}
static void complog_instrument_cmp_sub(const cs_insn * instr,
GumStalkerIterator *iterator) {
cs_x86 x86 = instr->detail->x86;
cs_x86_op *operand1;
cs_x86_op *operand2;
switch (instr->id) {
case X86_INS_CMP:
case X86_INS_SUB:
break;
default:
return;
}
if (x86.op_count != 2) return;
operand1 = &x86.operands[0];
operand2 = &x86.operands[1];
if (operand1->type == X86_OP_INVALID) return;
if (operand2->type == X86_OP_INVALID) return;
if ((operand1->type == X86_OP_MEM) &&
(operand1->mem.segment != X86_REG_INVALID))
return;
if ((operand2->type == X86_OP_MEM) &&
(operand2->mem.segment != X86_REG_INVALID))
return;
complog_instrument_cmp_sub_put_callout(iterator, operand1, operand2);
}
void complog_instrument(const cs_insn *instr, GumStalkerIterator *iterator) {
if (__afl_cmp_map == NULL) return;
complog_instrument_call(instr, iterator);
complog_instrument_cmp_sub(instr, iterator);
}
#endif
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