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/*
*
* honggfuzz - Intel PT decoder
* -----------------------------------------
*
* Author: Robert Swiecki <swiecki@google.com>
*
* Copyright 2010-2018 by Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. You may obtain
* a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*
*/
#include "pt.h"
#include <inttypes.h>
#include <linux/perf_event.h>
#include <stdio.h>
#include "libhfcommon/common.h"
#include "libhfcommon/log.h"
#include "libhfcommon/util.h"
#ifdef _HF_LINUX_INTEL_PT_LIB
#include <intel-pt.h>
struct pt_cpu ptCpu = {
.vendor = pcv_unknown,
.family = 0,
.model = 0,
.stepping = 0,
};
void perf_ptInit(void) {
FILE* f = fopen("/proc/cpuinfo", "rb");
if (!f) {
PLOG_E("Couldn't open '/proc/cpuinfo'");
return;
}
for (;;) {
char k[1024], t[1024], v[1024];
int ret = fscanf(f, "%1023[^\t]%1023[\t]: %1023[^\n]\n", k, t, v);
if (ret == EOF) {
break;
}
if (ret != 3) {
break;
}
if (strcmp(k, "vendor_id") == 0) {
if (strcmp(v, "GenuineIntel") == 0) {
ptCpu.vendor = pcv_intel;
LOG_D("IntelPT vendor: Intel");
} else {
ptCpu.vendor = pcv_unknown;
LOG_D("Current processor is not Intel, IntelPT will not work");
}
}
if (strcmp(k, "cpu family") == 0) {
ptCpu.family = atoi(v);
LOG_D("IntelPT family: %" PRIu16, ptCpu.family);
}
if (strcmp(k, "model") == 0) {
ptCpu.model = atoi(v);
LOG_D("IntelPT model: %" PRIu8, ptCpu.model);
}
if (strcmp(k, "stepping") == 0) {
ptCpu.stepping = atoi(v);
LOG_D("IntelPT stepping: %" PRIu8, ptCpu.stepping);
}
}
fclose(f);
}
/* Sign-extend a uint64_t value. */
inline static uint64_t sext(uint64_t val, uint8_t sign) {
uint64_t signbit, mask;
signbit = 1ull << (sign - 1);
mask = ~0ull << sign;
return val & signbit ? val | mask : val & ~mask;
}
__attribute__((hot)) inline static void perf_ptAnalyzePkt(run_t* run, struct pt_packet* packet) {
if (packet->type != ppt_tip) {
return;
}
uint64_t ip;
switch (packet->payload.ip.ipc) {
case pt_ipc_update_16:
ip = packet->payload.ip.ip & 0xFFFF;
break;
case pt_ipc_update_32:
ip = packet->payload.ip.ip & 0xFFFFFFFF;
break;
case pt_ipc_update_48:
ip = packet->payload.ip.ip & 0xFFFFFFFFFFFF;
break;
case pt_ipc_sext_48:
ip = sext(packet->payload.ip.ip, 48);
break;
case pt_ipc_full:
ip = packet->payload.ip.ip;
break;
default:
return;
}
if (ip >= run->global->linux.dynamicCutOffAddr) {
return;
}
ip &= _HF_PERF_BITMAP_BITSZ_MASK;
register uint8_t prev = ATOMIC_BTS(run->global->feedback.feedbackMap->bbMapPc, ip);
if (!prev) {
run->linux.hwCnts.newBBCnt++;
}
return;
}
void arch_ptAnalyze(run_t* run) {
struct perf_event_mmap_page* pem = (struct perf_event_mmap_page*)run->linux.perfMmapBuf;
uint64_t aux_tail = ATOMIC_GET(pem->aux_tail);
uint64_t aux_head = ATOMIC_GET(pem->aux_head);
/* smp_rmb() required as per /usr/include/linux/perf_event.h */
rmb();
struct pt_config ptc;
pt_config_init(&ptc);
ptc.begin = &run->linux.perfMmapAux[aux_tail];
ptc.end = &run->linux.perfMmapAux[aux_head];
ptc.cpu = ptCpu;
int errcode = pt_cpu_errata(&ptc.errata, &ptc.cpu);
if (errcode < 0) {
LOG_F("pt_errata() failed: %s", pt_errstr(-errcode));
}
struct pt_packet_decoder* ptd = pt_pkt_alloc_decoder(&ptc);
if (ptd == NULL) {
LOG_F("pt_pkt_alloc_decoder() failed");
}
defer {
pt_pkt_free_decoder(ptd);
};
errcode = pt_pkt_sync_forward(ptd);
if (errcode < 0) {
LOG_W("pt_pkt_sync_forward() failed: %s", pt_errstr(-errcode));
return;
}
for (;;) {
struct pt_packet packet;
errcode = pt_pkt_next(ptd, &packet, sizeof(packet));
if (errcode == -pte_eos) {
break;
}
if (errcode < 0) {
LOG_W("pt_pkt_next() failed: %s", pt_errstr(-errcode));
break;
}
perf_ptAnalyzePkt(run, &packet);
}
}
#else /* _HF_LINUX_INTEL_PT_LIB */
void perf_ptInit(void) {
return;
}
void arch_ptAnalyze(run_t* fuzzer HF_ATTR_UNUSED) {
LOG_F(
"The program has not been linked against the Intel's Processor Trace Library (libipt.so)");
}
#endif /* _HF_LINUX_INTEL_PT_LIB */
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