mirror of
https://github.com/reactos/syzkaller.git
synced 2024-11-27 13:20:34 +00:00
120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
// 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.
|
|
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
static void os_init(int argc, char** argv, void* data, size_t data_size)
|
|
{
|
|
#if GOOS_openbsd
|
|
// W^X not allowed by default on OpenBSD.
|
|
int prot = PROT_READ | PROT_WRITE;
|
|
#else
|
|
int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
|
|
#endif
|
|
|
|
if (mmap(data, data_size, prot, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) != data)
|
|
fail("mmap of data segment failed");
|
|
|
|
// Makes sure the file descriptor limit is sufficient to map control pipes.
|
|
struct rlimit rlim;
|
|
rlim.rlim_cur = rlim.rlim_max = kMaxFd;
|
|
setrlimit(RLIMIT_NOFILE, &rlim);
|
|
}
|
|
|
|
static long execute_syscall(const call_t* c, long a[kMaxArgs])
|
|
{
|
|
if (c->call)
|
|
return c->call(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8]);
|
|
return __syscall(c->sys_nr, a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8]);
|
|
}
|
|
|
|
#if GOOS_freebsd
|
|
|
|
#define KIOENABLE _IOW('c', 2, int) // Enable coverage recording
|
|
#define KIODISABLE _IO('c', 3) // Disable coverage recording
|
|
#define KIOSETBUFSIZE _IOW('c', 4, unsigned int) // Set the buffer size
|
|
|
|
#define KCOV_MODE_NONE -1
|
|
#define KCOV_MODE_TRACE_PC 0
|
|
#define KCOV_MODE_TRACE_CMP 1
|
|
|
|
#elif GOOS_openbsd
|
|
|
|
#define KIOSETBUFSIZE _IOW('K', 1, unsigned long)
|
|
#define KIOENABLE _IO('K', 2)
|
|
#define KIODISABLE _IO('K', 3)
|
|
|
|
#endif
|
|
|
|
#if GOOS_freebsd || GOOS_openbsd
|
|
|
|
static void cover_open(cover_t* cov)
|
|
{
|
|
int fd = open("/dev/kcov", O_RDWR);
|
|
if (fd == -1)
|
|
fail("open of /dev/kcov failed");
|
|
if (dup2(fd, cov->fd) < 0)
|
|
fail("failed to dup2(%d, %d) cover fd", fd, cov->fd);
|
|
close(fd);
|
|
|
|
#if GOOS_freebsd
|
|
if (ioctl(cov->fd, KIOSETBUFSIZE, &kCoverSize))
|
|
fail("ioctl init trace write failed");
|
|
#elif GOOS_openbsd
|
|
unsigned long cover_size = kCoverSize;
|
|
if (ioctl(cov->fd, KIOSETBUFSIZE, &cover_size))
|
|
fail("ioctl init trace write failed");
|
|
#endif
|
|
|
|
size_t mmap_alloc_size = kCoverSize * (is_kernel_64_bit ? 8 : 4);
|
|
char* mmap_ptr = (char*)mmap(NULL, mmap_alloc_size,
|
|
PROT_READ | PROT_WRITE,
|
|
MAP_SHARED, cov->fd, 0);
|
|
if (mmap_ptr == NULL)
|
|
fail("cover mmap failed");
|
|
cov->data = mmap_ptr;
|
|
cov->data_end = mmap_ptr + mmap_alloc_size;
|
|
}
|
|
|
|
static void cover_enable(cover_t* cov, bool collect_comps)
|
|
{
|
|
#if GOOS_freebsd
|
|
int kcov_mode = flag_collect_comps ? KCOV_MODE_TRACE_CMP : KCOV_MODE_TRACE_PC;
|
|
if (ioctl(cov->fd, KIOENABLE, &kcov_mode))
|
|
exitf("cover enable write trace failed, mode=%d", kcov_mode);
|
|
#elif GOOS_openbsd
|
|
if (ioctl(cov->fd, KIOENABLE))
|
|
exitf("cover enable write trace failed");
|
|
#endif
|
|
}
|
|
|
|
static void cover_reset(cover_t* cov)
|
|
{
|
|
*(uint64*)cov->data = 0;
|
|
}
|
|
|
|
static void cover_collect(cover_t* cov)
|
|
{
|
|
cov->size = *(uint64*)cov->data;
|
|
}
|
|
|
|
static bool cover_check(uint32 pc)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static bool cover_check(uint64 pc)
|
|
{
|
|
return true;
|
|
}
|
|
#else
|
|
#include "nocover.h"
|
|
#endif
|