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18ac22ea6e
radare2/libr/anal/op.c
pancake 18ac22ea6e Fix #5872 - uninitialized free in pdj
2016-09-28 16:47:33 +02:00

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/* radare - LGPL - Copyright 2010-2016 - pancake, nibble */
#include <r_anal.h>
#include <r_util.h>
#include <r_list.h>
#define SDB_VARUSED_FMT "qzdq"
struct VarUsedType {
ut64 fcn_addr;
char *type;
ut32 scope;
st64 delta;
};
R_API RAnalOp *r_anal_op_new () {
RAnalOp *op = R_NEW0 (RAnalOp);
if (!op) return NULL;
op->addr = UT64_MAX;
op->jump = UT64_MAX;
op->fail = UT64_MAX;
op->ptr = UT64_MAX;
op->val = UT64_MAX;
r_strbuf_init (&op->esil);
return op;
}
R_API RList *r_anal_op_list_new() {
RList *list = r_list_new ();
if (!list) {
return NULL;
}
list->free = &r_anal_op_free;
return list;
}
R_API bool r_anal_op_fini(RAnalOp *op) {
if (!op) {
return false;
}
r_anal_var_free (op->var);
r_anal_value_free (op->src[0]);
r_anal_value_free (op->src[1]);
r_anal_value_free (op->src[2]);
r_anal_value_free (op->dst);
r_strbuf_fini (&op->esil);
r_anal_switch_op_free (op->switch_op);
R_FREE (op->mnemonic);
return true;
}
R_API void r_anal_op_free(void *_op) {
if (!_op) {
return;
}
r_anal_op_fini (_op);
memset (_op, 0, sizeof (RAnalOp));
free (_op);
}
static RAnalVar *get_used_var(RAnal *anal, RAnalOp *op) {
char *inst_key = sdb_fmt (0, "inst.0x%"PFMT64x".vars", op->addr);
const char *var_def = sdb_const_get (anal->sdb_fcns, inst_key, 0);
struct VarUsedType vut;
RAnalVar *res;
if (sdb_fmt_tobin (var_def, SDB_VARUSED_FMT, &vut) != 4) {
return NULL;
}
res = r_anal_var_get (anal, vut.fcn_addr, vut.type[0], vut.scope, vut.delta);
sdb_fmt_free (&vut, SDB_VARUSED_FMT);
return res;
}
R_API int r_anal_op(RAnal *anal, RAnalOp *op, ut64 addr, const ut8 *data, int len) {
int ret = 0;
RAnalVar *tmp;
//len will end up in memcmp so check for negative
if (!anal || len < 0) {
return -1;
}
if (anal->pcalign) {
if (addr % anal->pcalign) {
memset (op, 0, sizeof (RAnalOp));
op->type = R_ANAL_OP_TYPE_ILL;
op->addr = addr;
op->size = 1;
return -1;
}
}
memset (op, 0, sizeof (RAnalOp));
if (len > 0 && anal->cur && anal->cur->op && strcmp (anal->cur->name, "null")) {
ret = anal->cur->op (anal, op, addr, data, len);
op->addr = addr;
//free the previous var in op->var
tmp = get_used_var (anal, op);
if (tmp) {
r_anal_var_free (op->var);
op->var = tmp;
}
if (ret < 1) {
op->type = R_ANAL_OP_TYPE_ILL;
}
} else {
if (!memcmp (data, "\xff\xff\xff\xff", R_MIN(4, len))) {
op->type = R_ANAL_OP_TYPE_ILL;
ret = 2; // HACK
} else {
op->type = R_ANAL_OP_TYPE_MOV;
}
}
return ret;
}
R_API RAnalOp *r_anal_op_copy (RAnalOp *op) {
RAnalOp *nop = R_NEW0 (RAnalOp);
if (!nop) return NULL;
*nop = *op;
if (op->mnemonic) {
nop->mnemonic = strdup (op->mnemonic);
if (!nop->mnemonic) {
free (nop);
return NULL;
}
} else {
nop->mnemonic = NULL;
}
nop->src[0] = r_anal_value_copy (op->src[0]);
nop->src[1] = r_anal_value_copy (op->src[1]);
nop->src[2] = r_anal_value_copy (op->src[2]);
nop->dst = r_anal_value_copy (op->dst);
r_strbuf_init (&nop->esil);
r_strbuf_set (&nop->esil, r_strbuf_get (&op->esil));
return nop;
}
// TODO: return RAnalException *
R_API int r_anal_op_execute (RAnal *anal, RAnalOp *op) {
while (op) {
if (op->delay > 0) {
anal->queued = r_anal_op_copy (op);
return false;
}
switch (op->type) {
case R_ANAL_OP_TYPE_JMP:
case R_ANAL_OP_TYPE_UJMP:
case R_ANAL_OP_TYPE_RJMP:
case R_ANAL_OP_TYPE_IJMP:
case R_ANAL_OP_TYPE_IRJMP:
case R_ANAL_OP_TYPE_CALL:
break;
case R_ANAL_OP_TYPE_ADD:
// dst = src[0] + src[1] + src[2]
r_anal_value_set_ut64 (anal, op->dst,
r_anal_value_to_ut64 (anal, op->src[0]) +
r_anal_value_to_ut64 (anal, op->src[1]) +
r_anal_value_to_ut64 (anal, op->src[2]));
break;
case R_ANAL_OP_TYPE_SUB:
// dst = src[0] + src[1] + src[2]
r_anal_value_set_ut64 (anal, op->dst,
r_anal_value_to_ut64 (anal, op->src[0]) -
r_anal_value_to_ut64 (anal, op->src[1]) -
r_anal_value_to_ut64 (anal, op->src[2]));
break;
case R_ANAL_OP_TYPE_DIV:
{
ut64 div = r_anal_value_to_ut64 (anal, op->src[1]);
if (div == 0) {
eprintf ("r_anal_op_execute: division by zero\n");
eprintf ("TODO: throw RAnalException\n");
} else r_anal_value_set_ut64 (anal, op->dst,
r_anal_value_to_ut64 (anal, op->src[0])/div);
}
break;
case R_ANAL_OP_TYPE_MUL:
r_anal_value_set_ut64 (anal, op->dst,
r_anal_value_to_ut64 (anal, op->src[0])*
r_anal_value_to_ut64 (anal, op->src[1]));
break;
case R_ANAL_OP_TYPE_MOV:
// dst = src[0]
r_anal_value_set_ut64 (anal, op->dst,
r_anal_value_to_ut64 (anal, op->src[0]));
break;
case R_ANAL_OP_TYPE_NOP:
// do nothing
break;
}
op = op->next;
}
if (anal->queued) {
anal->queued->delay--;
if (anal->queued->delay == 0) {
r_anal_op_execute (anal, anal->queued);
r_anal_op_free (anal->queued);
anal->queued = NULL;
}
}
return true;
}
R_API const char *r_anal_optype_to_string(int t) {
t &= R_ANAL_OP_TYPE_MASK; // ignore the modifier bits
switch (t) {
case R_ANAL_OP_TYPE_IO : return "io";
case R_ANAL_OP_TYPE_ACMP : return "acmp";
case R_ANAL_OP_TYPE_ADD : return "add";
case R_ANAL_OP_TYPE_AND : return "and";
case R_ANAL_OP_TYPE_CALL : return "call";
case R_ANAL_OP_TYPE_CCALL : return "ccall";
case R_ANAL_OP_TYPE_CJMP : return "cjmp";
case R_ANAL_OP_TYPE_MJMP : return "mjmp";
case R_ANAL_OP_TYPE_CMP : return "cmp";
case R_ANAL_OP_TYPE_CRET : return "cret";
case R_ANAL_OP_TYPE_DIV : return "div";
case R_ANAL_OP_TYPE_ILL : return "ill";
case R_ANAL_OP_TYPE_JMP : return "jmp";
case R_ANAL_OP_TYPE_LEA : return "lea";
case R_ANAL_OP_TYPE_LEAVE : return "leave";
case R_ANAL_OP_TYPE_LOAD : return "load";
case R_ANAL_OP_TYPE_MOD : return "mod";
case R_ANAL_OP_TYPE_CMOV : return "cmov";
case R_ANAL_OP_TYPE_MOV : return "mov";
case R_ANAL_OP_TYPE_MUL : return "mul";
case R_ANAL_OP_TYPE_NOP : return "nop";
case R_ANAL_OP_TYPE_NOT : return "not";
case R_ANAL_OP_TYPE_NULL : return "null";
case R_ANAL_OP_TYPE_OR : return "or";
case R_ANAL_OP_TYPE_POP : return "pop";
case R_ANAL_OP_TYPE_PUSH : return "push";
case R_ANAL_OP_TYPE_REP : return "rep";
case R_ANAL_OP_TYPE_RET : return "ret";
case R_ANAL_OP_TYPE_ROL : return "rol";
case R_ANAL_OP_TYPE_ROR : return "ror";
case R_ANAL_OP_TYPE_SAL : return "sal";
case R_ANAL_OP_TYPE_SAR : return "sar";
case R_ANAL_OP_TYPE_SHL : return "shl";
case R_ANAL_OP_TYPE_SHR : return "shr";
case R_ANAL_OP_TYPE_STORE : return "store";
case R_ANAL_OP_TYPE_SUB : return "sub";
case R_ANAL_OP_TYPE_SWI : return "swi";
case R_ANAL_OP_TYPE_SWITCH: return "switch";
case R_ANAL_OP_TYPE_TRAP : return "trap";
case R_ANAL_OP_TYPE_UCALL : return "ucall";
case R_ANAL_OP_TYPE_RCALL : return "ucall"; // needs to be changed
case R_ANAL_OP_TYPE_ICALL : return "ucall"; // needs to be changed
case R_ANAL_OP_TYPE_IRCALL: return "ucall"; // needs to be changed
case R_ANAL_OP_TYPE_UCCALL: return "uccall";
case R_ANAL_OP_TYPE_UCJMP : return "ucjmp";
case R_ANAL_OP_TYPE_UJMP : return "ujmp";
case R_ANAL_OP_TYPE_RJMP : return "ujmp"; // needs to be changed
case R_ANAL_OP_TYPE_IJMP : return "ujmp"; // needs to be changed
case R_ANAL_OP_TYPE_IRJMP : return "ujmp"; // needs to be changed
case R_ANAL_OP_TYPE_UNK : return "unk";
case R_ANAL_OP_TYPE_UPUSH : return "upush";
case R_ANAL_OP_TYPE_XCHG : return "xchg";
case R_ANAL_OP_TYPE_XOR : return "xor";
case R_ANAL_OP_TYPE_CASE : return "case";
case R_ANAL_OP_TYPE_CPL : return "cpl";
case R_ANAL_OP_TYPE_CRYPTO: return "crypto";
}
return "undefined";
}
R_API const char *r_anal_op_to_esil_string(RAnal *anal, RAnalOp *op) {
return r_strbuf_get (&op->esil);
}
// TODO: use esil here?
R_API char *r_anal_op_to_string(RAnal *anal, RAnalOp *op) {
RAnalBlock *bb;
RAnalFunction *f;
char ret[128];
char *cstr;
char *r0 = r_anal_value_to_string (op->dst);
char *a0 = r_anal_value_to_string (op->src[0]);
char *a1 = r_anal_value_to_string (op->src[1]);
if (!r0) r0 = strdup ("?");
if (!a0) a0 = strdup ("?");
if (!a1) a1 = strdup ("?");
switch (op->type) {
case R_ANAL_OP_TYPE_MOV:
snprintf (ret, sizeof (ret), "%s = %s", r0, a0);
break;
case R_ANAL_OP_TYPE_CJMP:
if ((bb = r_anal_bb_from_offset (anal, op->addr))) {
cstr = r_anal_cond_to_string (bb->cond);
snprintf (ret, sizeof (ret), "if (%s) goto 0x%"PFMT64x, cstr, op->jump);
free (cstr);
} else {
snprintf (ret, sizeof (ret), "if (%s) goto 0x%"PFMT64x, "?", op->jump);
}
break;
case R_ANAL_OP_TYPE_JMP:
snprintf (ret, sizeof (ret), "goto 0x%"PFMT64x, op->jump);
break;
case R_ANAL_OP_TYPE_UJMP:
case R_ANAL_OP_TYPE_RJMP:
case R_ANAL_OP_TYPE_IJMP:
case R_ANAL_OP_TYPE_IRJMP:
snprintf (ret, sizeof (ret), "goto %s", r0);
break;
case R_ANAL_OP_TYPE_PUSH:
case R_ANAL_OP_TYPE_UPUSH:
snprintf (ret, sizeof (ret), "push %s", a0);
break;
case R_ANAL_OP_TYPE_POP:
snprintf (ret, sizeof (ret), "pop %s", r0);
break;
case R_ANAL_OP_TYPE_UCALL:
case R_ANAL_OP_TYPE_RCALL:
case R_ANAL_OP_TYPE_ICALL:
case R_ANAL_OP_TYPE_IRCALL:
snprintf (ret, sizeof (ret), "%s()", r0);
break;
case R_ANAL_OP_TYPE_CALL:
f = r_anal_get_fcn_in (anal, op->jump, R_ANAL_FCN_TYPE_NULL);
if (f) snprintf (ret, sizeof (ret), "%s()", f->name);
else snprintf (ret, sizeof (ret), "0x%"PFMT64x"()", op->jump);
break;
case R_ANAL_OP_TYPE_CCALL:
f = r_anal_get_fcn_in (anal, op->jump, R_ANAL_FCN_TYPE_NULL);
if ((bb = r_anal_bb_from_offset (anal, op->addr))) {
cstr = r_anal_cond_to_string (bb->cond);
if (f) snprintf (ret, sizeof (ret), "if (%s) %s()", cstr, f->name);
else snprintf (ret, sizeof (ret), "if (%s) 0x%"PFMT64x"()", cstr, op->jump);
free (cstr);
} else {
if (f) snprintf (ret, sizeof (ret), "if (unk) %s()", f->name);
else snprintf (ret, sizeof (ret), "if (unk) 0x%"PFMT64x"()", op->jump);
}
break;
case R_ANAL_OP_TYPE_ADD:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "%s += %s", r0, a0);
} else {
snprintf (ret, sizeof (ret), "%s = %s + %s", r0, a0, a1);
}
break;
case R_ANAL_OP_TYPE_SUB:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "%s -= %s", r0, a0);
} else {
snprintf (ret, sizeof (ret), "%s = %s - %s", r0, a0, a1);
}
break;
case R_ANAL_OP_TYPE_MUL:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "%s *= %s", r0, a0);
} else {
snprintf (ret, sizeof (ret), "%s = %s * %s", r0, a0, a1);
}
break;
case R_ANAL_OP_TYPE_DIV:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "%s /= %s", r0, a0);
} else snprintf (ret, sizeof (ret), "%s = %s / %s", r0, a0, a1);
break;
case R_ANAL_OP_TYPE_AND:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "%s &= %s", r0, a0);
} else snprintf (ret, sizeof (ret), "%s = %s & %s", r0, a0, a1);
break;
case R_ANAL_OP_TYPE_OR:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "%s |= %s", r0, a0);
} else snprintf (ret, sizeof (ret), "%s = %s | %s", r0, a0, a1);
break;
case R_ANAL_OP_TYPE_XOR:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "%s ^= %s", r0, a0);
} else snprintf (ret, sizeof (ret), "%s = %s ^ %s", r0, a0, a1);
break;
case R_ANAL_OP_TYPE_LEA:
snprintf (ret, sizeof (ret), "%s -> %s", r0, a0);
break;
case R_ANAL_OP_TYPE_CMP:
memcpy (ret, ";", 2);
break;
case R_ANAL_OP_TYPE_NOP:
memcpy (ret, "nop", 4);
break;
case R_ANAL_OP_TYPE_RET:
memcpy (ret, "ret", 4);
break;
case R_ANAL_OP_TYPE_CRET:
if ((bb = r_anal_bb_from_offset (anal, op->addr))) {
cstr = r_anal_cond_to_string (bb->cond);
snprintf (ret, sizeof (ret), "if (%s) ret", cstr);
free (cstr);
} else {
strcpy (ret, "if (unk) ret");
}
break;
case R_ANAL_OP_TYPE_LEAVE:
memcpy (ret, "leave", 6);
break;
case R_ANAL_OP_TYPE_MOD:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "%s %%= %s", r0, a0);
} else {
snprintf (ret, sizeof (ret), "%s = %s %% %s", r0, a0, a1);
}
break;
case R_ANAL_OP_TYPE_XCHG:
if (!a1 || !strcmp (a0, a1)) {
snprintf (ret, sizeof (ret), "tmp = %s; %s = %s; %s = tmp", r0, r0, a0, a0);
} else {
snprintf (ret, sizeof (ret), "%s = %s ^ %s", r0, a0, a1);
}
break;
case R_ANAL_OP_TYPE_ROL:
case R_ANAL_OP_TYPE_ROR:
case R_ANAL_OP_TYPE_SWITCH:
case R_ANAL_OP_TYPE_CASE:
eprintf ("Command not implemented.\n");
free (r0);
free (a0);
free (a1);
return NULL;
default:
free (r0);
free (a0);
free (a1);
return NULL;
}
free (r0);
free (a0);
free (a1);
return strdup (ret);
}
R_API const char *r_anal_stackop_tostring(int s) {
switch (s) {
case R_ANAL_STACK_NULL:
return "null";
case R_ANAL_STACK_NOP:
return "nop";
case R_ANAL_STACK_INC:
return "inc";
case R_ANAL_STACK_GET:
return "get";
case R_ANAL_STACK_SET:
return "set";
case R_ANAL_STACK_RESET:
return "reset";
}
return "unk";
}
R_API const char *r_anal_op_family_to_string(int n) {
static char num[32];
switch (n) {
case R_ANAL_OP_FAMILY_UNKNOWN: return "unk";
case R_ANAL_OP_FAMILY_CPU: return "cpu";
case R_ANAL_OP_FAMILY_FPU: return "fpu";
case R_ANAL_OP_FAMILY_MMX: return "mmx";
case R_ANAL_OP_FAMILY_PRIV: return "priv";
case R_ANAL_OP_FAMILY_VIRT: return "virt";
default:
snprintf (num, sizeof (num), "%d", n);
break;
}
return num;
}
R_API int r_anal_op_family_from_string(const char *f) {
if (!strcmp (f, "cpu")) return R_ANAL_OP_FAMILY_CPU;
if (!strcmp (f, "fpu")) return R_ANAL_OP_FAMILY_FPU;
if (!strcmp (f, "mmx")) return R_ANAL_OP_FAMILY_MMX;
if (!strcmp (f, "priv")) return R_ANAL_OP_FAMILY_PRIV;
if (!strcmp (f, "virt")) return R_ANAL_OP_FAMILY_VIRT;
return R_ANAL_OP_FAMILY_UNKNOWN;
}
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