patchdiff2/sig.cpp at master · filcab/patchdiff2 · GitHub

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Patchdiff2

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License version 2 as

published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program. If not, see <http://www.gnu.org/licenses/>.

#include "precomp.hpp"

#include "sig.hpp"

#include "x86.hpp"

#include "ppc.hpp"

#include "patchdiff.hpp"

#include "pchart.hpp"

#include "os.hpp"

extern cpu_t patchdiff_cpu;

/*------------------------------------------------*/

/* function : pget_func_name */

/* description: Gets function name */

/*------------------------------------------------*/

char * pget_func_name(ea_t ea, char * buffer, size_t blen)

{

char * pos;

char tmp[512];

if (!get_func_name(ea, buffer, blen))

return NULL;

// make sure this is not a c++ class/struct badly defined as a function

demangle_name(tmp, blen, buffer, inf.long_demnames);

if ( (strstr(tmp, "public: static") || strstr(tmp, "private: static")) &&

(!strstr(tmp, "(") || strstr(tmp, "public: static long (__stdcall")) )

return NULL;

demangle_name(buffer, blen, buffer, inf.short_demnames);

// remove duplicates of the same name

pos = strstr(buffer, "Z$0");

if (pos)

pos[0] = '\0';

return buffer;

}

/*------------------------------------------------*/

/* function : sig_init */

/* description: Allocates and initializes a new */

/* function signature */

/*------------------------------------------------*/

psig_t * sig_init()

{

psig_t * sig;

sig = (psig_t *)qalloc(sizeof(*sig));

if (!sig)

return NULL;

memset(sig, 0, sizeof(*sig));

sig->mtype = DIFF_UNMATCHED;

sig->msig = NULL;

return sig;

}

/*------------------------------------------------*/

/* function : frefs_free */

/* description: Frees chained list */

/*------------------------------------------------*/

void frefs_free(frefs_t * frefs)

{

fref_t * fref, * next;

fref = frefs->list;

while (fref)

{

next = fref->next;

qfree(fref);

fref = next;

}

qfree(frefs);

}

/*------------------------------------------------*/

/* function : dsig_free */

/* description: Frees chained list */

/*------------------------------------------------*/

void dsig_free(dpsig_t * ds)

{

dpsig_t * next;

while (ds)

{

next = ds->next;

qfree(ds);

ds = next;

}

qfree(ds);

}

/*------------------------------------------------*/

/* function : clist_free */

/* description: Frees clist_t structure */

/*------------------------------------------------*/

void clist_free(clist_t * cl)

{

dsig_free(cl->sigs);

dsig_free(cl->msigs);

qfree(cl);

}

/*------------------------------------------------*/

/* function : sig_free */

/* description: Frees signature */

/*------------------------------------------------*/

void sig_free(psig_t * sig)

{

if (sig->name)

{

qfree(sig->name);

sig->name = NULL;

}

if (sig->dl.lines != NULL)

qfree(sig->dl.lines);

if (sig->prefs) frefs_free(sig->prefs);

if (sig->srefs) frefs_free(sig->srefs);

if (sig->cp) clist_free(sig->cp);

if (sig->cs) clist_free(sig->cs);

qfree(sig);

}

/*------------------------------------------------*/

/* function : sig_set_name */

/* description: Sets function signature name */

/*------------------------------------------------*/

void sig_set_name(psig_t * sig, const char * name)

{

sig->name = qstrdup(name);

}

/*------------------------------------------------*/

/* function : sig_set_start */

/* description: Sets function start address */

/*------------------------------------------------*/

void sig_set_start(psig_t * sig, ea_t ea)

{

sig->startEA = ea;

}

/*------------------------------------------------*/

/* function : sig_get_start */

/* description: Returns function start address */

/*------------------------------------------------*/

ea_t sig_get_start(psig_t * sig)

{

return sig->startEA;

}

/*------------------------------------------------*/

/* function : sig_get_preds */

/* description: Returns signature pred xrefs */

/*------------------------------------------------*/

frefs_t * sig_get_preds(psig_t * sig)

{

return sig->prefs;

}

/*------------------------------------------------*/

/* function : sig_get_succs */

/* description: Returns signature succ xrefs */

/*------------------------------------------------*/

frefs_t * sig_get_succs(psig_t * sig)

{

return sig->srefs;

}

/*------------------------------------------------*/

/* function : sig_get_crefs */

/* description: Returns signature cxrefs */

/*------------------------------------------------*/

clist_t * sig_get_crefs(psig_t * sig, int type)

{

if (type == SIG_PRED)

return sig->cp;

if (type == SIG_SUCC)

return sig->cs;

return NULL;

}

/*------------------------------------------------*/

/* function : sig_set_crefs */

/* description: Sets signature cxrefs */

/*------------------------------------------------*/

void sig_set_crefs(psig_t * sig, int type, clist_t * cl)

{

if (type == SIG_PRED)

sig->cp = cl;

else if (type == SIG_SUCC)

sig->cs = cl;

}

/*------------------------------------------------*/

/* function : sig_set_nfile */

/* description: Sets file number */

/*------------------------------------------------*/

void sig_set_nfile(psig_t * sig, int num)

{

sig->nfile = num;

}

/*------------------------------------------------*/

/* function : sig_set_matched_sig */

/* description: Sets matched address */

/*------------------------------------------------*/

void sig_set_matched_sig(psig_t * sig, psig_t * sig2, int type)

{

sig->msig = sig2;

sig->matchedEA = sig2->startEA;

sig2->msig = sig;

sig2->matchedEA = sig->startEA;

sig->mtype = sig2->mtype = type;

if (sig->crc_hash != sig2->crc_hash)

sig->id_crc = sig2->id_crc = 1;

}

/*------------------------------------------------*/

/* function : sig_get_matched_sig */

/* description: Returns matched address */

/*------------------------------------------------*/

psig_t * sig_get_matched_sig(psig_t * sig)

{

return sig->msig;

}

/*------------------------------------------------*/

/* function : sig_get_matched_type */

/* description: Returns matched type */

/*------------------------------------------------*/

int sig_get_matched_type(psig_t * sig)

{

return sig->mtype;

}

/*------------------------------------------------*/

/* function : sig_add_fref */

/* description: Adds a function reference to the */

/* signature */

/*------------------------------------------------*/

int sig_add_fref(frefs_t ** frefs, ea_t ea, int type, char rtype)

{

fref_t * ref, * next;

if (!*frefs)

{

*frefs = (frefs_t *)qalloc(sizeof(**frefs));

if (!*frefs) return -1;

memset(*frefs, 0, sizeof(**frefs));

}

else

{

//don't add duplicates

next = (*frefs)->list;

while(next)

{

if (next->ea == ea)

return -1;

next = next->next;

}

ref = (fref_t *)qalloc(sizeof(*ref));

if (!ref) return -1;

ref->ea = ea;

ref->type = type;

ref->rtype = rtype;

ref->next = (*frefs)->list;

(*frefs)->num++;

(*frefs)->list = ref;

return 0;

}

/*------------------------------------------------*/

/* function : sig_add_pref */

/* description: Adds a function reference to the */

/* signature */

/*------------------------------------------------*/

int sig_add_pref(psig_t * sig, ea_t ea, int type, char rtype)

{

return sig_add_fref(&sig->prefs, ea, type, rtype);

}

/*------------------------------------------------*/

/* function : sig_add_sref */

/* description: Adds a function reference to the */

/* signature */

/*------------------------------------------------*/

int sig_add_sref(psig_t * sig, ea_t ea, int type, char rtype)

{

return sig_add_fref(&sig->srefs, ea, type, rtype);

}

/*------------------------------------------------*/

/* function : is_fake_jump */

/* description: Returns TRUE if the instruction at*/

/* ea is a jump */

/*------------------------------------------------*/

bool is_fake_jump(ea_t ea)

{

switch(patchdiff_cpu)

{

case CPU_X8632:

case CPU_X8664:

if (x86_get_fake_jump(ea) != BADADDR)

return true;

default:

return false;

}

/*------------------------------------------------*/

/* function : ignore_jump */

/* description: Returns TRUE if the instruction at*/

/* ea is a jump that must be ignored */

/* in the signature */

/*------------------------------------------------*/

bool ignore_jump(ea_t ea)

{

switch(patchdiff_cpu)

{

case CPU_X8632:

case CPU_X8664:

if (!x86_is_direct_jump(ea))

return false;

default:

return true;

}

/*------------------------------------------------*/

/* function : is_jump */

/* description: Returns TRUE if the instruction at*/

/* ea is a jump */

/*------------------------------------------------*/

bool is_jump(psig_t * sig, ea_t ea, bool * call, bool * cj)

{

xrefblk_t xb;

cref_t cr;

*call = false;

*cj = false;

if (xb.first_from(ea, XREF_FAR))

{

cr = (cref_t)xb.type;

if (xb.iscode && (cr == fl_JF || cr == fl_JN)) {

if (ignore_jump(ea)) {

return true;

} else {

*cj = true;

}

if (xb.iscode && (cr == fl_CF || cr == fl_CN))

{

if (sig->type == 1)

sig_add_sref(sig, xb.to, 0, CHECK_REF);

*call = true;

}

else

return is_fake_jump(ea);

return false;

}

/*------------------------------------------------*/

/* function : remove_instr */

/* description: Returns TRUE if the instruction at*/

/* ea must not be added to the sig */

/*------------------------------------------------*/

bool remove_instr(unsigned char byte, ea_t ea)

{

switch (patchdiff_cpu)

{

case CPU_X8632:

case CPU_X8664:

return x86_remove_instr(byte, ea);

case CPU_PPC:

return ppc_remove_instr(byte, ea);

default:

return false;

}

/*------------------------------------------------*/

/* function : get_byte_with_optimization */

/* description: Returns byte at address ea */

/* note: Uses the processor optimized function if */

/* available */

/*------------------------------------------------*/

char get_byte_with_optimization(ea_t ea)

{

switch (patchdiff_cpu)

{

case CPU_X8632:

case CPU_X8664:

return x86_get_byte(ea);

case CPU_PPC:

return ppc_get_byte(ea);

default:

{

decode_insn(ea);

return (char)cmd.itype;

}

unsigned long ror(unsigned long val, int r)

{

return (val >> r) | (val << (32-r));

}

/*------------------------------------------------*/

/* function : dline_add */

/* description: Adds a disassembled line to the */

/* signature */

/*------------------------------------------------*/

int dline_add(dline_t * dl, ea_t ea, char options)

{

char buf[256];

char tmp[256];

char dis[256];

char addr[30];

char * dll;

int len;

flags_t f;

buf[0] = '\0';

f = getFlags(ea);

generate_disasm_line(ea, dis, sizeof(dis));

decode_insn(ea);

init_output_buffer(buf, sizeof(buf));

// Adds block label

if (has_dummy_name(f))

{

get_nice_colored_name(ea,tmp,sizeof(tmp),GNCN_NOSEG|GNCN_NOFUNC);

out_snprintf("%s", tmp);

out_line(":\n", COLOR_DATNAME);

}

if (options)

{

qsnprintf(addr, sizeof(addr), "%a", ea);

out_snprintf("%s ", addr);

}

out_insert(get_output_ptr(), dis);

term_output_buffer();

len = strlen(buf);

if (dl->available < (len+3))

{

dll = (char *)qrealloc(dl->lines, sizeof(char*) * (dl->num+len+256));

if (!dll) return -1;

dl->available = len+256;

dl->lines = dll;

}

if (dl->num)

{

dl->lines[dl->num] = '\n';

dl->num++;

}

memcpy(&dl->lines[dl->num], buf, len);

dl->available -= len+1;

dl->num += len;

dl->lines[dl->num] = '\0';

return 0;

}

/*------------------------------------------------*/

/* function : sig_add_address */

/* description: Adds an address to the signature */

/*------------------------------------------------*/

int sig_add_address(psig_t * sig, short opcodes[256], ea_t ea, bool b, bool line, char options)

{

unsigned char byte;

unsigned char buf[200];

uint32 s, i;

bool call;

bool cj;

ea_t tea;

flags_t f;

if (line)

dline_add(&sig->dl, ea, options);

if (is_jump(sig, ea, &call, &cj))

return -1;

byte = get_byte_with_optimization(ea);

if (remove_instr(byte, ea))

return -1;

sig->lines++;

opcodes[byte]++;

if (!b && !call)

{

if (cj)

{

buf[0] = byte;

s = 1;

}

else

{

s = (uint32)get_item_size(ea);

if (s > sizeof(buf)) s = sizeof(buf);

get_many_bytes(ea, buf, s);

}

for (i=0; i<s; i++)

{

sig->crc_hash += buf[i];

sig->crc_hash += ( sig->crc_hash << 10 );

sig->crc_hash ^= ( sig->crc_hash >> 6 );

}

else if (b)

{

tea = get_first_dref_from(ea);

if (tea != BADADDR)

{

f = getFlags(tea);

if (isASCII(f))

{

opinfo_t op_info;

get_opinfo(tea, 0, f, &op_info);

s = get_max_ascii_length(tea, op_info.strtype);

if (!get_ascii_contents2(tea, s, op_info.strtype, buf, sizeof(buf)))

s = sizeof(buf);

for (i=0; i<s; i++)

sig->str_hash += buf[i]*i;

}

return 0;

}

/*------------------------------------------------*/

/* function : sig_add_block */

/* description: Adds a block to the signature */

/*------------------------------------------------*/

int sig_add_block(psig_t * sig, short opcodes[256], ea_t startEA, ea_t endEA, bool line, char options)

{

ea_t ea;

flags_t flags;

bool b;

ea = startEA;

while (ea < endEA)

{

flags = getFlags (ea);

if (!isCode (flags))

return -1;

b = get_first_dref_from(ea) != BADADDR ? true : false;

sig_add_address(sig, opcodes, ea, isOff(flags, OPND_ALL) || b, line, options);

ea += get_item_size(ea);

}

return 0;

}

int OS_CDECL compare(const void *arg1, const void *arg2)

{

return *((short *)arg1) - *((short *)arg2);

}

/*------------------------------------------------*/

/* function : sig_calc_sighash */

/* description: generates a sig/hash for the */

/* signature opcodes */

/*------------------------------------------------*/

int sig_calc_sighash(psig_t * sig, short _opcodes[256], int do_sig)

{

short tmp;

short opcodes[256];

int i, j;

memcpy(opcodes, _opcodes, sizeof(opcodes));

qsort(opcodes, 256, sizeof(short), compare);

for (i=0; i<256; i++)

for (j=0; j<255; j++)

if (opcodes[j] > opcodes[j+1])

{

tmp = opcodes[j+1];

opcodes[j+1] = opcodes[j];

opcodes[j] = tmp;

}

sig->hash2 = 0;

if (do_sig) sig->sig = 0;

for (i=0; i<256; i++)

{

if (do_sig) sig->sig += opcodes[i] * i;

sig->hash2 = ror(sig->hash2, 13);

sig->hash2 += _opcodes[i];

}

return 0;

}

/*------------------------------------------------*/

/* function : sig_parse_dref_list */

/* description: checks if the data ref is a class */

/* like structure. Returns class ea */

/* on success */

/*------------------------------------------------*/

ea_t sig_parse_dref_list(psig_t * sig, ea_t ea)

{

ea_t fref;

flags_t f;

// scan up

{

fref = get_first_dref_from(ea);

if (fref == BADADDR)

return BADADDR;

f = getFlags(fref);

if (!isCode(f))

return BADADDR;

fref = get_first_dref_to(ea);

if (fref != BADADDR)

{

f = getFlags(fref);

if (!isCode(f))

return BADADDR;

return ea;

}

ea = prev_visea(ea);

} while(ea != BADADDR);

return ea;

}

/*------------------------------------------------*/

/* function : sig_is_class */

/* description: Returns true is the signature is */

/* a class */

/*------------------------------------------------*/

bool sig_is_class(psig_t * sig)

{

if (sig->sig == CLASS_SIG && sig->hash == CLASS_SIG && sig->crc_hash == CLASS_SIG)

return true;

return false;

}

/*------------------------------------------------*/

/* function : sig_class_generate */

/* description: generates a signature for the */

/* class structure */

/*------------------------------------------------*/

psig_t * sig_class_generate(ea_t ea)

{

func_t * xfct;

psig_t * sig;

ea_t fref;

char buf[512];

sig = sig_init();

if (!sig)

return NULL;

// Adds function start address

sig_set_start(sig, ea);

// Adds function name

qsnprintf(buf, sizeof(buf), "sub_%a", ea);

sig_set_name(sig, buf);

// Adds class references

fref = get_first_dref_to(ea);

while (fref != BADADDR)

{

xfct = get_func(fref);

if (xfct)

sig_add_sref(sig, xfct->startEA, 0, CHECK_REF);

fref = get_next_dref_to(ea, fref);

}

sig->hash = sig->crc_hash = sig->sig = CLASS_SIG;

return sig;

}

/*------------------------------------------------*/

/* function : sig_generate */

/* description: generates a signature for the */

/* given function */

/*------------------------------------------------*/

psig_t * sig_generate(size_t fct_num, qvector<ea_t> & class_l)

{

func_t * fct, * xfct;

pflow_chart_t * fchart;

psig_t * sig;

ea_t fref, ea;

int bnum, i;

char buf[512];

short opcodes[256];

qvector<int> call_list;

flags_t f;

fct = getn_func(fct_num);

memset(opcodes, '\0', sizeof(opcodes));

fchart = new pflow_chart_t(fct);

sig = sig_init();

if (!sig)

{

delete fchart;

return NULL;

}

sig->type = 1;

// Adds function start address

sig_set_start(sig, fct->startEA);

// Adds function name

if (pget_func_name(fct->startEA, buf, sizeof(buf)))

sig_set_name(sig, buf);

else return NULL;

// Adds function references

fref = get_first_dref_to(fct->startEA);

while (fref != BADADDR)

{

f = getFlags(fref);

if (isCode(f))

{

xfct = get_func(fref);

if (xfct && xfct->startEA != fct->startEA)

sig_add_pref(sig, xfct->startEA, 0, CHECK_REF);

}

else

{

ea = sig_parse_dref_list(sig, fref);

if (ea != BADADDR)

{

sig_add_pref(sig, ea, 0, CHECK_REF);

class_l.add_unique(ea);

}

fref = get_next_dref_to(fct->startEA, fref);

}

// Adds each block to the signature

bnum = fchart->nproper;

sig->hash = 0;

sig->sig = 0;

for (i=0; i<bnum; i++)

{

int j;

int ttype;

int smax = fchart->nsucc(i);

sig->sig += (i+1) + smax*i;

sig_add_block(sig, opcodes, fchart->blocks[i].startEA, fchart->blocks[i].endEA, 0, 0);

for(j=0; j<smax; j++)

{

sig->hash = ror(sig->hash, 13);

ttype = fchart->blocks[i].succ[j].type;

if (ttype == 2) ttype--;

sig->hash += ttype;

}

sig_calc_sighash(sig, opcodes, 0);

delete fchart;

return sig;

}

/*------------------------------------------------*/

/* function : sig_save */

/* description: Saves signature refs to disk */

/*------------------------------------------------*/

void sig_save_refs(FILE * fp, frefs_t * refs)

{

int num, i;

fref_t * tmp;

if (refs)

{

num = refs->num;

qfwrite(fp, &num, sizeof(num));

tmp = refs->list;

for (i=0; i<num; i++)

{

qfwrite(fp, &tmp->ea, sizeof(tmp->ea));

qfwrite(fp, &tmp->type, sizeof(tmp->type));

tmp = tmp->next;

}

else

{

num = 0;

qfwrite(fp, &num, sizeof(num));

}

/*------------------------------------------------*/

/* function : sig_save */

/* description: Saves signature to disk */

/*------------------------------------------------*/

int sig_save(psig_t * sig, FILE * fp)

{

size_t len;

// saves function name

len = strlen(sig->name);

qfwrite(fp, &len, sizeof(len));

qfwrite(fp, sig->name, len);

// saves function start address

qfwrite(fp, &sig->startEA, sizeof(sig->startEA));

// saves function lines

qfwrite(fp, &sig->dl.num, sizeof(sig->dl.num));

qfwrite(fp, sig->dl.lines, sig->dl.num);

// saves sig/hash

qfwrite(fp, &sig->sig, sizeof(sig->sig));

qfwrite(fp, &sig->hash, sizeof(sig->hash));

qfwrite(fp, &sig->hash2, sizeof(sig->hash2));

qfwrite(fp, &sig->crc_hash, sizeof(sig->crc_hash));

qfwrite(fp, &sig->str_hash, sizeof(sig->str_hash));

// saves function refs

sig_save_refs(fp, sig->prefs);

sig_save_refs(fp, sig->srefs);

return 0;

}

/*------------------------------------------------*/

/* function : sig_load_prefs */

/* description: Loads signature refs from disk */

/*------------------------------------------------*/

void sig_load_prefs(psig_t * sig, FILE * fp, int type)

{

int num, i;

pedge_t * eatab;

// loads function refs in reverse order

qfread(fp, &num, sizeof(num));

eatab = (pedge_t *)qalloc(num * sizeof(*eatab));

for (i=0; i<num; i++)

{

qfread(fp, &eatab[i].ea, sizeof(eatab[i].ea));

qfread(fp, &eatab[i].type, sizeof(eatab[i].type));

}

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patchdiff2/sig.cpp at master · filcab/patchdiff2 · GitHub

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