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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.
#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
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