OpenBSD UBsan support / common

Summary:
Sanitizer common, enable OpenBSD platform.
- Enable common interceptors as possible and create few distinct ones.
- Create necessary sanitizer_struct types.

Patch by: David CARLIER

Reviewers: krytarowski, vitalybuka, visa, kettenis

Reviewed By: vitalybuka

Subscribers: emaste, srhines, kubamracek, mgorny, fedor.sergeev, llvm-commits, #sanitizers

Differential Revision: https://reviews.llvm.org/D43909

llvm-svn: 326650

4 files changed, 762 insertions, 0 deletions

diff --git a/compiler-rt/lib/sanitizer_common/CMakeLists.txt b/compiler-rt/lib/sanitizer_common/CMakeLists.txt
index a77849acfa2..fb73c879293 100644
--- a/compiler-rt/lib/sanitizer_common/CMakeLists.txt
+++ b/compiler-rt/lib/sanitizer_common/CMakeLists.txt
@@ -16,9 +16,11 @@ set(SANITIZER_SOURCES_NOTERMINATION
   sanitizer_linux.cc
   sanitizer_linux_s390.cc
   sanitizer_mac.cc
+  sanitizer_openbsd.cc
   sanitizer_persistent_allocator.cc
   sanitizer_platform_limits_linux.cc
   sanitizer_platform_limits_netbsd.cc
+  sanitizer_platform_limits_openbsd.cc
   sanitizer_platform_limits_posix.cc
   sanitizer_platform_limits_solaris.cc
   sanitizer_posix.cc
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_openbsd.cc b/compiler-rt/lib/sanitizer_common/sanitizer_openbsd.cc
new file mode 100644
index 00000000000..2aea7cb1487
--- /dev/null
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_openbsd.cc
@@ -0,0 +1,101 @@
+//===-- sanitizer_openbsd.cc ----------------------------------------------===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between various sanitizers' runtime libraries and
+// implements Solaris-specific functions.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_platform.h"
+#if SANITIZER_OPENBSD
+
+#include <stdio.h>
+
+#include "sanitizer_common.h"
+#include "sanitizer_flags.h"
+#include "sanitizer_internal_defs.h"
+#include "sanitizer_libc.h"
+#include "sanitizer_placement_new.h"
+#include "sanitizer_platform_limits_posix.h"
+#include "sanitizer_procmaps.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <pthread.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/shm.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+extern char **environ;
+
+namespace __sanitizer {
+
+uptr internal_mmap(void *addr, size_t length, int prot, int flags, int fd,
+                   u64 offset) {
+  return (uptr)mmap(addr, length, prot, flags, fd, offset);
+}
+
+uptr internal_munmap(void *addr, uptr length) { return munmap(addr, length); }
+
+int internal_mprotect(void *addr, uptr length, int prot) {
+  return mprotect(addr, length, prot);
+}
+
+uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
+  // On OpenBSD we cannot get the full path
+  struct kinfo_proc kp;
+  size_t kl;
+  const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()};
+  if (sysctl(Mib, ARRAY_SIZE(Mib), &kp, &kl, NULL, 0) != -1)
+    return internal_snprintf(buf,
+                             (KI_MAXCOMLEN < buf_len ? KI_MAXCOMLEN : buf_len),
+                             "%s", kp.p_comm);
+  return (uptr)0;
+}
+
+static void GetArgsAndEnv(char ***argv, char ***envp) {
+  size_t nargv;
+  size_t nenv;
+  int argvmib[4] = {CTL_KERN, KERN_PROC_ARGS, getpid(), KERN_PROC_ARGV};
+  int envmib[4] = {CTL_KERN, KERN_PROC_ARGS, getpid(), KERN_PROC_ENV};
+  if (sysctl(argvmib, 4, NULL, &nargv, NULL, 0) == -1) {
+    Printf("sysctl KERN_PROC_NARGV failed\n");
+    Die();
+  }
+  if (sysctl(envmib, 4, NULL, &nenv, NULL, 0) == -1) {
+    Printf("sysctl KERN_PROC_NENV failed\n");
+    Die();
+  }
+  if (sysctl(argvmib, 4, &argv, &nargv, NULL, 0) == -1) {
+    Printf("sysctl KERN_PROC_ARGV failed\n");
+    Die();
+  }
+  if (sysctl(envmib, 4, &envp, &nenv, NULL, 0) == -1) {
+    Printf("sysctl KERN_PROC_ENV failed\n");
+    Die();
+  }
+}
+
+char **GetArgv() {
+  char **argv, **envp;
+  GetArgsAndEnv(&argv, &envp);
+  return argv;
+}
+
+void ReExec() {
+  UNIMPLEMENTED();
+}
+
+}  // namespace __sanitizer
+
+#endif  // SANITIZER_OPENBSD
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_openbsd.cc b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_openbsd.cc
new file mode 100644
index 00000000000..7ab0ff60a24
--- /dev/null
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_openbsd.cc
@@ -0,0 +1,279 @@
+//===-- sanitizer_platform_limits_openbsd.cc ------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of Sanitizer common code.
+//
+// Sizes and layouts of platform-specific NetBSD data structures.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_platform.h"
+
+#if SANITIZER_OPENBSD
+#include <arpa/inet.h>
+#include <dirent.h>
+#include <glob.h>
+#include <grp.h>
+#include <ifaddrs.h>
+#include <limits.h>
+#include <link_elf.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <net/ppp_defs.h>
+#include <net/route.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <netinet/ip_mroute.h>
+#include <poll.h>
+#include <pthread.h>
+#include <pwd.h>
+#include <semaphore.h>
+#include <signal.h>
+#include <soundcard.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/filio.h>
+#include <sys/ipc.h>
+#include <sys/mman.h>
+#include <sys/mount.h>
+#include <sys/msg.h>
+#include <sys/mtio.h>
+#include <sys/ptrace.h>
+#include <sys/resource.h>
+#include <sys/shm.h>
+#include <sys/signal.h>
+#include <sys/sockio.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <sys/utsname.h>
+#include <term.h>
+#include <time.h>
+#include <utime.h>
+#include <utmp.h>
+#include <wchar.h>
+
+// Include these after system headers to avoid name clashes and ambiguities.
+#include "sanitizer_internal_defs.h"
+#include "sanitizer_platform_limits_openbsd.h"
+
+namespace __sanitizer {
+unsigned struct_utsname_sz = sizeof(struct utsname);
+unsigned struct_stat_sz = sizeof(struct stat);
+unsigned struct_rusage_sz = sizeof(struct rusage);
+unsigned struct_tm_sz = sizeof(struct tm);
+unsigned struct_passwd_sz = sizeof(struct passwd);
+unsigned struct_group_sz = sizeof(struct group);
+unsigned siginfo_t_sz = sizeof(siginfo_t);
+unsigned struct_sigaction_sz = sizeof(struct sigaction);
+unsigned struct_itimerval_sz = sizeof(struct itimerval);
+unsigned pthread_t_sz = sizeof(pthread_t);
+unsigned pthread_mutex_t_sz = sizeof(pthread_mutex_t);
+unsigned pthread_cond_t_sz = sizeof(pthread_cond_t);
+unsigned pid_t_sz = sizeof(pid_t);
+unsigned timeval_sz = sizeof(timeval);
+unsigned uid_t_sz = sizeof(uid_t);
+unsigned gid_t_sz = sizeof(gid_t);
+unsigned mbstate_t_sz = sizeof(mbstate_t);
+unsigned sigset_t_sz = sizeof(sigset_t);
+unsigned struct_timezone_sz = sizeof(struct timezone);
+unsigned struct_tms_sz = sizeof(struct tms);
+unsigned struct_sched_param_sz = sizeof(struct sched_param);
+unsigned struct_sockaddr_sz = sizeof(struct sockaddr);
+unsigned struct_rlimit_sz = sizeof(struct rlimit);
+unsigned struct_timespec_sz = sizeof(struct timespec);
+unsigned struct_utimbuf_sz = sizeof(struct utimbuf);
+unsigned struct_itimerspec_sz = sizeof(struct itimerspec);
+unsigned struct_msqid_ds_sz = sizeof(struct msqid_ds);
+unsigned struct_statvfs_sz = sizeof(struct statvfs);
+
+const uptr sig_ign = (uptr)SIG_IGN;
+const uptr sig_dfl = (uptr)SIG_DFL;
+const uptr sig_err = (uptr)SIG_ERR;
+const uptr sa_siginfo = (uptr)SA_SIGINFO;
+
+int shmctl_ipc_stat = (int)IPC_STAT;
+
+unsigned struct_utmp_sz = sizeof(struct utmp);
+
+int map_fixed = MAP_FIXED;
+
+int af_inet = (int)AF_INET;
+int af_inet6 = (int)AF_INET6;
+
+uptr __sanitizer_in_addr_sz(int af) {
+  if (af == AF_INET)
+    return sizeof(struct in_addr);
+  else if (af == AF_INET6)
+    return sizeof(struct in6_addr);
+  else
+    return 0;
+}
+
+unsigned struct_ElfW_Phdr_sz = sizeof(Elf_Phdr);
+
+int glob_nomatch = GLOB_NOMATCH;
+int glob_altdirfunc = GLOB_ALTDIRFUNC;
+
+unsigned path_max = PATH_MAX;
+
+const int si_SEGV_MAPERR = SEGV_MAPERR;
+const int si_SEGV_ACCERR = SEGV_ACCERR;
+}  // namespace __sanitizer
+
+using namespace __sanitizer;
+
+COMPILER_CHECK(sizeof(__sanitizer_pthread_attr_t) >= sizeof(pthread_attr_t));
+
+COMPILER_CHECK(sizeof(socklen_t) == sizeof(unsigned));
+CHECK_TYPE_SIZE(pthread_key_t);
+
+CHECK_TYPE_SIZE(dl_phdr_info);
+CHECK_SIZE_AND_OFFSET(dl_phdr_info, dlpi_addr);
+CHECK_SIZE_AND_OFFSET(dl_phdr_info, dlpi_name);
+CHECK_SIZE_AND_OFFSET(dl_phdr_info, dlpi_phdr);
+CHECK_SIZE_AND_OFFSET(dl_phdr_info, dlpi_phnum);
+
+CHECK_TYPE_SIZE(glob_t);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_pathc);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_pathv);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_offs);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_flags);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_closedir);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_readdir);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_opendir);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_lstat);
+CHECK_SIZE_AND_OFFSET(glob_t, gl_stat);
+
+CHECK_TYPE_SIZE(addrinfo);
+CHECK_SIZE_AND_OFFSET(addrinfo, ai_flags);
+CHECK_SIZE_AND_OFFSET(addrinfo, ai_family);
+CHECK_SIZE_AND_OFFSET(addrinfo, ai_socktype);
+CHECK_SIZE_AND_OFFSET(addrinfo, ai_protocol);
+CHECK_SIZE_AND_OFFSET(addrinfo, ai_addrlen);
+CHECK_SIZE_AND_OFFSET(addrinfo, ai_addr);
+CHECK_SIZE_AND_OFFSET(addrinfo, ai_canonname);
+CHECK_SIZE_AND_OFFSET(addrinfo, ai_next);
+
+CHECK_TYPE_SIZE(hostent);
+CHECK_SIZE_AND_OFFSET(hostent, h_name);
+CHECK_SIZE_AND_OFFSET(hostent, h_aliases);
+CHECK_SIZE_AND_OFFSET(hostent, h_addrtype);
+CHECK_SIZE_AND_OFFSET(hostent, h_length);
+CHECK_SIZE_AND_OFFSET(hostent, h_addr_list);
+
+CHECK_TYPE_SIZE(iovec);
+CHECK_SIZE_AND_OFFSET(iovec, iov_base);
+CHECK_SIZE_AND_OFFSET(iovec, iov_len);
+
+CHECK_TYPE_SIZE(msghdr);
+CHECK_SIZE_AND_OFFSET(msghdr, msg_name);
+CHECK_SIZE_AND_OFFSET(msghdr, msg_namelen);
+CHECK_SIZE_AND_OFFSET(msghdr, msg_iov);
+CHECK_SIZE_AND_OFFSET(msghdr, msg_iovlen);
+CHECK_SIZE_AND_OFFSET(msghdr, msg_control);
+CHECK_SIZE_AND_OFFSET(msghdr, msg_controllen);
+CHECK_SIZE_AND_OFFSET(msghdr, msg_flags);
+
+CHECK_TYPE_SIZE(cmsghdr);
+CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_len);
+CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_level);
+CHECK_SIZE_AND_OFFSET(cmsghdr, cmsg_type);
+
+COMPILER_CHECK(sizeof(__sanitizer_dirent) <= sizeof(dirent));
+CHECK_SIZE_AND_OFFSET(dirent, d_fileno);
+CHECK_SIZE_AND_OFFSET(dirent, d_off);
+CHECK_SIZE_AND_OFFSET(dirent, d_reclen);
+
+CHECK_TYPE_SIZE(ifconf);
+CHECK_SIZE_AND_OFFSET(ifconf, ifc_len);
+CHECK_SIZE_AND_OFFSET(ifconf, ifc_ifcu);
+
+CHECK_TYPE_SIZE(pollfd);
+CHECK_SIZE_AND_OFFSET(pollfd, fd);
+CHECK_SIZE_AND_OFFSET(pollfd, events);
+CHECK_SIZE_AND_OFFSET(pollfd, revents);
+
+CHECK_TYPE_SIZE(nfds_t);
+
+CHECK_TYPE_SIZE(sigset_t);
+
+COMPILER_CHECK(sizeof(__sanitizer_sigaction) == sizeof(struct sigaction));
+// Can't write checks for sa_handler and sa_sigaction due to them being
+// preprocessor macros.
+CHECK_STRUCT_SIZE_AND_OFFSET(sigaction, sa_mask);
+
+CHECK_TYPE_SIZE(tm);
+CHECK_SIZE_AND_OFFSET(tm, tm_sec);
+CHECK_SIZE_AND_OFFSET(tm, tm_min);
+CHECK_SIZE_AND_OFFSET(tm, tm_hour);
+CHECK_SIZE_AND_OFFSET(tm, tm_mday);
+CHECK_SIZE_AND_OFFSET(tm, tm_mon);
+CHECK_SIZE_AND_OFFSET(tm, tm_year);
+CHECK_SIZE_AND_OFFSET(tm, tm_wday);
+CHECK_SIZE_AND_OFFSET(tm, tm_yday);
+CHECK_SIZE_AND_OFFSET(tm, tm_isdst);
+CHECK_SIZE_AND_OFFSET(tm, tm_gmtoff);
+CHECK_SIZE_AND_OFFSET(tm, tm_zone);
+
+CHECK_TYPE_SIZE(ipc_perm);
+CHECK_SIZE_AND_OFFSET(ipc_perm, cuid);
+CHECK_SIZE_AND_OFFSET(ipc_perm, cgid);
+CHECK_SIZE_AND_OFFSET(ipc_perm, uid);
+CHECK_SIZE_AND_OFFSET(ipc_perm, gid);
+CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
+CHECK_SIZE_AND_OFFSET(ipc_perm, seq);
+CHECK_SIZE_AND_OFFSET(ipc_perm, key);
+
+CHECK_TYPE_SIZE(shmid_ds);
+CHECK_SIZE_AND_OFFSET(shmid_ds, shm_perm);
+CHECK_SIZE_AND_OFFSET(shmid_ds, shm_segsz);
+CHECK_SIZE_AND_OFFSET(shmid_ds, shm_atime);
+CHECK_SIZE_AND_OFFSET(shmid_ds, __shm_atimensec);
+CHECK_SIZE_AND_OFFSET(shmid_ds, shm_dtime);
+CHECK_SIZE_AND_OFFSET(shmid_ds, __shm_dtimensec);
+CHECK_SIZE_AND_OFFSET(shmid_ds, shm_ctime);
+CHECK_SIZE_AND_OFFSET(shmid_ds, __shm_ctimensec);
+CHECK_SIZE_AND_OFFSET(shmid_ds, shm_cpid);
+CHECK_SIZE_AND_OFFSET(shmid_ds, shm_lpid);
+CHECK_SIZE_AND_OFFSET(shmid_ds, shm_nattch);
+
+CHECK_TYPE_SIZE(clock_t);
+
+CHECK_TYPE_SIZE(ifaddrs);
+CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_next);
+CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_name);
+CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_addr);
+CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_netmask);
+// Compare against the union, because we can't reach into the union in a
+// compliant way.
+#ifdef ifa_dstaddr
+#undef ifa_dstaddr
+#endif
+CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_dstaddr);
+CHECK_SIZE_AND_OFFSET(ifaddrs, ifa_data);
+
+CHECK_TYPE_SIZE(passwd);
+CHECK_SIZE_AND_OFFSET(passwd, pw_name);
+CHECK_SIZE_AND_OFFSET(passwd, pw_passwd);
+CHECK_SIZE_AND_OFFSET(passwd, pw_uid);
+CHECK_SIZE_AND_OFFSET(passwd, pw_gid);
+CHECK_SIZE_AND_OFFSET(passwd, pw_dir);
+CHECK_SIZE_AND_OFFSET(passwd, pw_shell);
+
+CHECK_SIZE_AND_OFFSET(passwd, pw_gecos);
+
+CHECK_TYPE_SIZE(group);
+CHECK_SIZE_AND_OFFSET(group, gr_name);
+CHECK_SIZE_AND_OFFSET(group, gr_passwd);
+CHECK_SIZE_AND_OFFSET(group, gr_gid);
+CHECK_SIZE_AND_OFFSET(group, gr_mem);
+
+#endif  // SANITIZER_OPENBSD
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_openbsd.h b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_openbsd.h
new file mode 100644
index 00000000000..b926ca628eb
--- /dev/null
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_openbsd.h
@@ -0,0 +1,380 @@
+//===-- sanitizer_platform_limits_openbsd.h -------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of Sanitizer common code.
+//
+// Sizes and layouts of platform-specific OpenBSD data structures.
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_PLATFORM_LIMITS_OPENBSD_H
+#define SANITIZER_PLATFORM_LIMITS_OPENBSD_H
+
+#if SANITIZER_OPENBSD
+
+#include "sanitizer_internal_defs.h"
+#include "sanitizer_platform.h"
+
+#define _GET_LINK_MAP_BY_DLOPEN_HANDLE(handle, shift) \
+  ((link_map *)((handle) == nullptr ? nullptr : ((char *)(handle) + (shift))))
+
+#if defined(__x86_64__)
+#define GET_LINK_MAP_BY_DLOPEN_HANDLE(handle) \
+  _GET_LINK_MAP_BY_DLOPEN_HANDLE(handle, 312)
+#elif defined(__i386__)
+#define GET_LINK_MAP_BY_DLOPEN_HANDLE(handle) \
+  _GET_LINK_MAP_BY_DLOPEN_HANDLE(handle, 164)
+#endif
+
+namespace __sanitizer {
+extern unsigned struct_utsname_sz;
+extern unsigned struct_stat_sz;
+extern unsigned struct_rusage_sz;
+extern unsigned siginfo_t_sz;
+extern unsigned struct_itimerval_sz;
+extern unsigned pthread_t_sz;
+extern unsigned pthread_mutex_t_sz;
+extern unsigned pthread_cond_t_sz;
+extern unsigned pid_t_sz;
+extern unsigned timeval_sz;
+extern unsigned uid_t_sz;
+extern unsigned gid_t_sz;
+extern unsigned mbstate_t_sz;
+extern unsigned struct_timezone_sz;
+extern unsigned struct_tms_sz;
+extern unsigned struct_itimerspec_sz;
+extern unsigned struct_sigevent_sz;
+extern unsigned struct_statfs_sz;
+extern unsigned struct_sockaddr_sz;
+
+extern unsigned struct_rlimit_sz;
+extern unsigned struct_utimbuf_sz;
+extern unsigned struct_timespec_sz;
+
+struct __sanitizer_iocb {
+  u64 aio_offset;
+  uptr aio_buf;
+  long aio_nbytes;
+  u32 aio_fildes;
+  u32 aio_lio_opcode;
+  long aio_reqprio;
+#if SANITIZER_WORDSIZE == 64
+  u8 aio_sigevent[32];
+#else
+  u8 aio_sigevent[20];
+#endif
+  u32 _state;
+  u32 _errno;
+  long _retval;
+};
+
+struct __sanitizer___sysctl_args {
+  int *name;
+  int nlen;
+  void *oldval;
+  uptr *oldlenp;
+  void *newval;
+  uptr newlen;
+};
+
+struct __sanitizer_sem_t {
+  uptr data[5];
+};
+
+struct __sanitizer_ipc_perm {
+  u32 cuid;
+  u32 cgid;
+  u32 uid;
+  u32 gid;
+  u32 mode;
+  unsigned short seq;
+  long key;
+};
+
+struct __sanitizer_shmid_ds {
+  __sanitizer_ipc_perm shm_perm;
+  int shm_segsz;
+  u32 shm_lpid;
+  u32 shm_cpid;
+  short shm_nattch;
+  u64 shm_atime;
+  long __shm_atimensec;
+  u64 shm_dtime;
+  long __shm_dtimensec;
+  u64 shm_ctime;
+  long __shm_ctimensec;
+  void *_shm_internal;
+};
+
+extern unsigned struct_msqid_ds_sz;
+extern unsigned struct_mq_attr_sz;
+extern unsigned struct_timex_sz;
+extern unsigned struct_statvfs_sz;
+
+struct __sanitizer_iovec {
+  void *iov_base;
+  uptr iov_len;
+};
+
+struct __sanitizer_ifaddrs {
+  struct __sanitizer_ifaddrs *ifa_next;
+  char *ifa_name;
+  unsigned int ifa_flags;
+  struct __sanitizer_sockaddr *ifa_addr;     // (struct sockaddr *)
+  struct __sanitizer_sockaddr *ifa_netmask;  // (struct sockaddr *)
+  struct __sanitizer_sockaddr *ifa_dstaddr;  // (struct sockaddr *)
+  void *ifa_data;
+};
+
+typedef unsigned __sanitizer_pthread_key_t;
+
+typedef long long __sanitizer_time_t;
+typedef int __sanitizer_suseconds_t;
+
+struct __sanitizer_timeval {
+  __sanitizer_time_t tv_sec;
+  __sanitizer_suseconds_t tv_usec;
+};
+
+struct __sanitizer_itimerval {
+  struct __sanitizer_timeval it_interval;
+  struct __sanitizer_timeval it_value;
+};
+
+struct __sanitizer_passwd {
+  char *pw_name;
+  char *pw_passwd;
+  int pw_uid;
+  int pw_gid;
+  __sanitizer_time_t pw_change;
+  char *pw_class;
+  char *pw_gecos;
+  char *pw_dir;
+  char *pw_shell;
+  __sanitizer_time_t pw_expire;
+};
+
+struct __sanitizer_group {
+  char *gr_name;
+  char *gr_passwd;
+  int gr_gid;
+  char **gr_mem;
+};
+
+struct __sanitizer_ether_addr {
+  u8 octet[6];
+};
+
+struct __sanitizer_tm {
+  int tm_sec;
+  int tm_min;
+  int tm_hour;
+  int tm_mday;
+  int tm_mon;
+  int tm_year;
+  int tm_wday;
+  int tm_yday;
+  int tm_isdst;
+  long int tm_gmtoff;
+  const char *tm_zone;
+};
+
+struct __sanitizer_msghdr {
+  void *msg_name;
+  unsigned msg_namelen;
+  struct __sanitizer_iovec *msg_iov;
+  unsigned msg_iovlen;
+  void *msg_control;
+  unsigned msg_controllen;
+  int msg_flags;
+};
+struct __sanitizer_cmsghdr {
+  unsigned cmsg_len;
+  int cmsg_level;
+  int cmsg_type;
+};
+
+struct __sanitizer_dirent {
+  u64 d_fileno;
+  u64 d_off;
+  u16 d_reclen;
+};
+
+typedef u64 __sanitizer_clock_t;
+typedef u32 __sanitizer_clockid_t;
+
+typedef u32 __sanitizer___kernel_uid_t;
+typedef u32 __sanitizer___kernel_gid_t;
+typedef u64 __sanitizer___kernel_off_t;
+typedef struct {
+  u32 fds_bits[8];
+} __sanitizer___kernel_fd_set;
+
+typedef struct {
+  unsigned int pta_magic;
+  int pta_flags;
+  void *pta_private;
+} __sanitizer_pthread_attr_t;
+
+typedef unsigned int __sanitizer_sigset_t;
+
+struct __sanitizer_siginfo {
+  // The size is determined by looking at sizeof of real siginfo_t on linux.
+  u64 opaque[128 / sizeof(u64)];
+};
+
+using __sanitizer_sighandler_ptr = void (*)(int sig);
+using __sanitizer_sigactionhandler_ptr = void (*)(int sig,
+                                                  __sanitizer_siginfo *siginfo,
+                                                  void *uctx);
+
+struct __sanitizer_sigaction {
+  union {
+    __sanitizer_sighandler_ptr handler;
+    __sanitizer_sigactionhandler_ptr sigaction;
+  };
+  __sanitizer_sigset_t sa_mask;
+  int sa_flags;
+};
+
+typedef __sanitizer_sigset_t __sanitizer_kernel_sigset_t;
+
+struct __sanitizer_kernel_sigaction_t {
+  union {
+    void (*handler)(int signo);
+    void (*sigaction)(int signo, void *info, void *ctx);
+  };
+  unsigned long sa_flags;
+  void (*sa_restorer)(void);
+  __sanitizer_kernel_sigset_t sa_mask;
+};
+
+extern const uptr sig_ign;
+extern const uptr sig_dfl;
+extern const uptr sig_err;
+extern const uptr sa_siginfo;
+
+extern int af_inet;
+extern int af_inet6;
+uptr __sanitizer_in_addr_sz(int af);
+
+struct __sanitizer_dl_phdr_info {
+#if SANITIZER_WORDSIZE == 64
+  u64 dlpi_addr;
+#else
+  u32 dlpi_addr;
+#endif
+  const char *dlpi_name;
+  const void *dlpi_phdr;
+#if SANITIZER_WORDSIZE == 64
+  u32 dlpi_phnum;
+#else
+  u16 dlpi_phnum;
+#endif
+};
+
+extern unsigned struct_ElfW_Phdr_sz;
+
+struct __sanitizer_addrinfo {
+  int ai_flags;
+  int ai_family;
+  int ai_socktype;
+  int ai_protocol;
+  unsigned ai_addrlen;
+  struct __sanitizer_sockaddr *ai_addr;
+  char *ai_canonname;
+  struct __sanitizer_addrinfo *ai_next;
+};
+
+struct __sanitizer_hostent {
+  char *h_name;
+  char **h_aliases;
+  int h_addrtype;
+  int h_length;
+  char **h_addr_list;
+};
+
+struct __sanitizer_pollfd {
+  int fd;
+  short events;
+  short revents;
+};
+
+typedef unsigned __sanitizer_nfds_t;
+
+struct __sanitizer_glob_t {
+  int gl_pathc;
+  int gl_matchc;
+  int gl_offs;
+  int gl_flags;
+  char **gl_pathv;
+  void **gl_statv;
+  int (*gl_errfunc)(const char *, int);
+  void (*gl_closedir)(void *dirp);
+  struct dirent *(*gl_readdir)(void *dirp);
+  void *(*gl_opendir)(const char *);
+  int (*gl_lstat)(const char *, void * /* struct stat* */);
+  int (*gl_stat)(const char *, void * /* struct stat* */);
+};
+
+extern int glob_nomatch;
+extern int glob_altdirfunc;
+
+extern unsigned path_max;
+
+typedef char __sanitizer_FILE;
+#define SANITIZER_HAS_STRUCT_FILE 0
+
+extern int shmctl_ipc_stat;
+
+// This simplifies generic code
+#define struct_shminfo_sz -1
+#define struct_shm_info_sz -1
+#define shmctl_shm_stat -1
+#define shmctl_ipc_info -1
+#define shmctl_shm_info -1
+
+extern unsigned struct_utmp_sz;
+extern unsigned struct_utmpx_sz;
+
+extern int map_fixed;
+
+// ioctl arguments
+struct __sanitizer_ifconf {
+  int ifc_len;
+  union {
+    void *ifcu_req;
+  } ifc_ifcu;
+};
+
+extern const int si_SEGV_MAPERR;
+extern const int si_SEGV_ACCERR;
+}  // namespace __sanitizer
+
+#define CHECK_TYPE_SIZE(TYPE) \
+  COMPILER_CHECK(sizeof(__sanitizer_##TYPE) == sizeof(TYPE))
+
+#define CHECK_SIZE_AND_OFFSET(CLASS, MEMBER)                      \
+  COMPILER_CHECK(sizeof(((__sanitizer_##CLASS *)NULL)->MEMBER) == \
+                 sizeof(((CLASS *)NULL)->MEMBER));                \
+  COMPILER_CHECK(offsetof(__sanitizer_##CLASS, MEMBER) ==         \
+                 offsetof(CLASS, MEMBER))
+
+// For sigaction, which is a function and struct at the same time,
+// and thus requires explicit "struct" in sizeof() expression.
+#define CHECK_STRUCT_SIZE_AND_OFFSET(CLASS, MEMBER)                      \
+  COMPILER_CHECK(sizeof(((struct __sanitizer_##CLASS *)NULL)->MEMBER) == \
+                 sizeof(((struct CLASS *)NULL)->MEMBER));                \
+  COMPILER_CHECK(offsetof(struct __sanitizer_##CLASS, MEMBER) ==         \
+                 offsetof(struct CLASS, MEMBER))
+
+#define SIGACTION_SYMNAME __sigaction14
+
+#endif  // SANITIZER_OPENBSD
+
+#endif