libc/include/bits/fortify/socket.h

/*
 * Copyright (C) 2017 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _SYS_SOCKET_H_
#error "Never include this file directly; instead, include <sys/socket.h>"
#endif

extern ssize_t __sendto_chk(int, const void*, size_t, size_t, int, const struct sockaddr*,
        socklen_t) __INTRODUCED_IN(26);
ssize_t __recvfrom_chk(int, void*, size_t, size_t, int, struct sockaddr*,
        socklen_t*) __INTRODUCED_IN(21);

#if defined(__BIONIC_FORTIFY)

#define __recvfrom_bad_size "recvfrom called with size bigger than buffer"
#define __sendto_bad_size "sendto called with size bigger than buffer"
#if defined(__clang__)
#if __ANDROID_API__ >= __ANDROID_API_N__
__BIONIC_ERROR_FUNCTION_VISIBILITY
ssize_t recvfrom(int fd, void* const buf __pass_object_size0, size_t len,
                 int flags, struct sockaddr* src_addr, socklen_t* addr_len)
        __overloadable
        __enable_if(__bos(buf) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&
                    __bos(buf) < len, "selected when the buffer is too small")
        __errorattr(__recvfrom_bad_size);

__BIONIC_FORTIFY_INLINE
ssize_t recvfrom(int fd, void* const buf __pass_object_size0, size_t len,
                 int flags, struct sockaddr* src_addr, socklen_t* addr_len)
      __overloadable {
  size_t bos = __bos0(buf);

  if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
    return __call_bypassing_fortify(recvfrom)(fd, buf, len, flags, src_addr,
              addr_len);
  }

  return __recvfrom_chk(fd, buf, len, bos, flags, src_addr, addr_len);
}
#endif /* __ANDROID_API__ >= __ANDROID_API_N__ */

#if __ANDROID_API__ >= __ANDROID_API_N_MR1__
__BIONIC_ERROR_FUNCTION_VISIBILITY
ssize_t sendto(int fd, const void* buf, size_t len, int flags,
               const struct sockaddr* dest_addr, socklen_t addr_len)
        __overloadable
        __enable_if(__bos0(buf) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&
                    __bos0(buf) < len, "selected when the buffer is too small")
        __errorattr(__sendto_bad_size);

__BIONIC_FORTIFY_INLINE
ssize_t sendto(int fd, const void* const buf __pass_object_size0, size_t len,
               int flags, const struct sockaddr* dest_addr, socklen_t addr_len)
      __overloadable {
  size_t bos = __bos0(buf);

  if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
    return __call_bypassing_fortify(sendto)(fd, buf, len, flags, dest_addr,
              addr_len);
  }

  return __sendto_chk(fd, buf, len, bos, flags, dest_addr, addr_len);
}

__BIONIC_ERROR_FUNCTION_VISIBILITY
ssize_t send(int socket, const void* buf, size_t len, int flags)
        __overloadable
        __enable_if(__bos0(buf) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&
                    __bos0(buf) < len, "selected when the buffer is too small")
        __errorattr("send called with size bigger than buffer");
#endif /* __ANDROID_API__ >= __ANDROID_API_N_MR1__ */

#else /* defined(__clang__) */
ssize_t __recvfrom_real(int, void*, size_t, int, struct sockaddr*, socklen_t*) __RENAME(recvfrom);
__errordecl(__recvfrom_error, __recvfrom_bad_size);

extern ssize_t __sendto_real(int, const void*, size_t, int, const struct sockaddr*, socklen_t)
        __RENAME(sendto);
__errordecl(__sendto_error, __sendto_bad_size);

#if __ANDROID_API__ >= __ANDROID_API_N__
__BIONIC_FORTIFY_INLINE
ssize_t recvfrom(int fd, void* buf, size_t len, int flags,
                 struct sockaddr* src_addr, socklen_t* addr_len) {
  size_t bos = __bos0(buf);

  if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
    return __recvfrom_real(fd, buf, len, flags, src_addr, addr_len);
  }

  if (__builtin_constant_p(len) && (len <= bos)) {
    return __recvfrom_real(fd, buf, len, flags, src_addr, addr_len);
  }

  if (__builtin_constant_p(len) && (len > bos)) {
    __recvfrom_error();
  }

  return __recvfrom_chk(fd, buf, len, bos, flags, src_addr, addr_len);
}
#endif /* __ANDROID_API__ >= __ANDROID_API_N__ */

#if __ANDROID_API__ >= __ANDROID_API_N_MR1__
__BIONIC_FORTIFY_INLINE
ssize_t sendto(int fd, const void* buf, size_t len, int flags,
               const struct sockaddr* dest_addr, socklen_t addr_len) {
  size_t bos = __bos0(buf);

  if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
    return __sendto_real(fd, buf, len, flags, dest_addr, addr_len);
  }

  if (__builtin_constant_p(len) && (len <= bos)) {
    return __sendto_real(fd, buf, len, flags, dest_addr, addr_len);
  }

  if (__builtin_constant_p(len) && (len > bos)) {
    __sendto_error();
  }

  return __sendto_chk(fd, buf, len, bos, flags, dest_addr, addr_len);
}
#endif /* __ANDROID_API__ >= __ANDROID_API_N_MR1__ */

#endif /* defined(__clang__) */
#undef __recvfrom_bad_size
#undef __sendto_bad_size

__BIONIC_FORTIFY_INLINE
ssize_t recv(int socket, void* const buf __pass_object_size0, size_t len,
             int flags) __overloadable {
  return recvfrom(socket, buf, len, flags, NULL, 0);
}

__BIONIC_FORTIFY_INLINE
ssize_t send(int socket, const void* const buf __pass_object_size0, size_t len, int flags)
        __overloadable {
  return sendto(socket, buf, len, flags, NULL, 0);
}

#endif /* __BIONIC_FORTIFY */