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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
// This file is shared between executor and csource package.
#include <unistd.h>
#include <zircon/process.h>
#include <zircon/syscalls.h>
#if defined(SYZ_EXECUTOR) || defined(SYZ_THREADED) || defined(SYZ_COLLIDE)
#include <pthread.h>
#include <stdlib.h>
#endif
#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT))
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#endif
#define doexit exit
#include "common.h"
#if defined(SYZ_EXECUTOR) || defined(SYZ_HANDLE_SEGV)
static __thread int skip_segv;
static __thread jmp_buf segv_env;
static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
// Generated programs can contain bad (unmapped/protected) addresses,
// which cause SIGSEGVs during copyin/copyout.
// This handler ignores such crashes to allow the program to proceed.
// We additionally opportunistically check that the faulty address
// is not within executable data region, because such accesses can corrupt
// output region and then fuzzer will fail on corrupted data.
uintptr_t addr = (uintptr_t)info->si_addr;
const uintptr_t prog_start = 1 << 20;
const uintptr_t prog_end = 100 << 20;
if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) {
debug("SIGSEGV on %p, skipping\n", addr);
_longjmp(segv_env, 1);
}
debug("SIGSEGV on %p, exiting\n", addr);
doexit(sig);
for (;;) {
}
}
static void install_segv_handler()
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = segv_handler;
sa.sa_flags = SA_NODEFER | SA_SIGINFO;
sigaction(SIGSEGV, &sa, NULL);
sigaction(SIGBUS, &sa, NULL);
}
#define NONFAILING(...) \
{ \
__atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \
if (_setjmp(segv_env) == 0) { \
__VA_ARGS__; \
} \
__atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \
}
#endif
#if defined(SYZ_EXECUTOR) || (defined(SYZ_REPEAT) && defined(SYZ_WAIT_REPEAT))
static uint64_t current_time_ms()
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
fail("clock_gettime failed");
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}
#endif
#if defined(SYZ_EXECUTOR)
static void sleep_ms(uint64_t ms)
{
usleep(ms * 1000);
}
#endif
#if defined(SYZ_EXECUTOR) || defined(SYZ_FAULT_INJECTION)
static int inject_fault(int nth)
{
return 0;
}
static int fault_injected(int fail_fd)
{
return 0;
}
#endif
#if defined(SYZ_EXECUTOR) || defined(__NR_syz_mmap)
long syz_mmap(size_t addr, size_t size)
{
zx_handle_t root = zx_vmar_root_self();
zx_info_vmar_t info;
zx_status_t status = zx_object_get_info(root, ZX_INFO_VMAR, &info, sizeof(info), 0, 0);
if (status != ZX_OK)
error("zx_object_get_info(ZX_INFO_VMAR) failed: %d", status);
uintptr_t res = 0;
zx_handle_t mapping = 0;
status = zx_vmar_allocate(root, addr - info.base, size,
ZX_VM_FLAG_SPECIFIC | ZX_VM_FLAG_CAN_MAP_READ | ZX_VM_FLAG_CAN_MAP_WRITE,
&mapping, &res);
if (status == ZX_OK && addr != res)
error("zx_vmar_allocate allocated wrong address: %p, want %p", (void*)res, (void*)addr);
return status;
}
#endif
#if defined(SYZ_EXECUTOR) || defined(__NR_syz_process_self)
long syz_process_self()
{
return zx_process_self();
}
#endif
#if defined(SYZ_EXECUTOR) || defined(__NR_syz_thread_self)
long syz_thread_self()
{
return zx_thread_self();
}
#endif
#if defined(SYZ_EXECUTOR) || defined(__NR_syz_vmar_root_self)
long syz_vmar_root_self()
{
return zx_vmar_root_self();
}
#endif
#if defined(SYZ_EXECUTOR) || defined(__NR_syz_job_default)
long syz_job_default()
{
return zx_job_default();
}
#endif
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