mirror of
https://github.com/reactos/syzkaller.git
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19cfcead69
Since the OpenBSD target does not make use of syz_execute_func yet, just drop
PROT_EXEC for now.
Supporting write and exec would require one to edit /etc/fstab during
installation.
Regression introduced in commit a4718693 ("sys/linux: add syz_execute_func").
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
// Copyright 2017 syzkaller project authors. All rights reserved.
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// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
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// This is just so that "make executor TARGETOS=freebsd/netbsd" works on linux.
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#define __syscall syscall
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#endif
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static void os_init(int argc, char** argv, void* data, size_t data_size)
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{
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#if GOOS_openbsd
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// W^X not allowed by default on OpenBSD.
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int prot = PROT_READ | PROT_WRITE;
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#else
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int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
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#endif
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if (mmap(data, data_size, prot, MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0) != data)
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fail("mmap of data segment failed");
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// Some minimal sandboxing.
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// TODO: this should go into common_bsd.h because csource needs this too.
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struct rlimit rlim;
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#if GOOS_netbsd
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// This causes frequent random aborts on netbsd. Reason unknown.
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rlim.rlim_cur = rlim.rlim_max = 128 << 20;
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setrlimit(RLIMIT_AS, &rlim);
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#endif
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rlim.rlim_cur = rlim.rlim_max = 8 << 20;
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setrlimit(RLIMIT_MEMLOCK, &rlim);
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rlim.rlim_cur = rlim.rlim_max = 1 << 20;
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setrlimit(RLIMIT_FSIZE, &rlim);
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rlim.rlim_cur = rlim.rlim_max = 1 << 20;
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setrlimit(RLIMIT_STACK, &rlim);
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rlim.rlim_cur = rlim.rlim_max = 0;
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setrlimit(RLIMIT_CORE, &rlim);
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rlim.rlim_cur = rlim.rlim_max = 256; // see kMaxFd
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setrlimit(RLIMIT_NOFILE, &rlim);
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}
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static long execute_syscall(const call_t* c, long a[kMaxArgs])
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{
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if (c->call)
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return c->call(a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8]);
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return __syscall(c->sys_nr, a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8]);
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}
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#if GOOS_freebsd
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#define KIOENABLE _IOW('c', 2, int) // Enable coverage recording
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#define KIODISABLE _IO('c', 3) // Disable coverage recording
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#define KIOSETBUFSIZE _IOW('c', 4, unsigned int) // Set the buffer size
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#define KCOV_MODE_NONE -1
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#define KCOV_MODE_TRACE_PC 0
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#define KCOV_MODE_TRACE_CMP 1
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#elif GOOS_openbsd
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#define KIOSETBUFSIZE _IOW('K', 1, unsigned long)
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#define KIOENABLE _IO('K', 2)
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#define KIODISABLE _IO('K', 3)
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#endif
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#if GOOS_freebsd || GOOS_openbsd
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static void cover_open(cover_t* cov)
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{
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int fd = open("/dev/kcov", O_RDWR);
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if (fd == -1)
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fail("open of /dev/kcov failed");
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if (dup2(fd, cov->fd) < 0)
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fail("failed to dup2(%d, %d) cover fd", fd, cov->fd);
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close(fd);
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#if GOOS_freebsd
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if (ioctl(cov->fd, KIOSETBUFSIZE, &kCoverSize))
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fail("ioctl init trace write failed");
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#elif GOOS_openbsd
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unsigned long cover_size = kCoverSize;
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if (ioctl(cov->fd, KIOSETBUFSIZE, &cover_size))
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fail("ioctl init trace write failed");
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#endif
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size_t mmap_alloc_size = kCoverSize * (is_kernel_64_bit ? 8 : 4);
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char* mmap_ptr = (char*)mmap(NULL, mmap_alloc_size,
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PROT_READ | PROT_WRITE,
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MAP_SHARED, cov->fd, 0);
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if (mmap_ptr == NULL)
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fail("cover mmap failed");
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cov->data = mmap_ptr;
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cov->data_end = mmap_ptr + mmap_alloc_size;
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}
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static void cover_enable(cover_t* cov, bool collect_comps)
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{
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#if GOOS_freebsd
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int kcov_mode = flag_collect_comps ? KCOV_MODE_TRACE_CMP : KCOV_MODE_TRACE_PC;
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if (ioctl(cov->fd, KIOENABLE, &kcov_mode))
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exitf("cover enable write trace failed, mode=%d", kcov_mode);
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#elif GOOS_openbsd
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if (ioctl(cov->fd, KIOENABLE))
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exitf("cover enable write trace failed");
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#endif
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}
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static void cover_reset(cover_t* cov)
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{
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*(uint64*)cov->data = 0;
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}
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static void cover_collect(cover_t* cov)
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{
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cov->size = *(uint64*)cov->data;
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}
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static bool cover_check(uint32 pc)
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{
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return true;
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}
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static bool cover_check(uint64 pc)
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{
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return true;
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}
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#else
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#include "nocover.h"
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#endif
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