xref: /external/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc

//===-- sanitizer_common_interceptors.inc -----------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Common function interceptors for tools like AddressSanitizer,
// ThreadSanitizer, MemorySanitizer, etc.
//
// This file should be included into the tool's interceptor file,
// which has to define it's own macros:
//   COMMON_INTERCEPTOR_ENTER
//   COMMON_INTERCEPTOR_READ_RANGE
//   COMMON_INTERCEPTOR_WRITE_RANGE
//   COMMON_INTERCEPTOR_FD_ACQUIRE
//   COMMON_INTERCEPTOR_FD_RELEASE
//   COMMON_INTERCEPTOR_SET_THREAD_NAME
//===----------------------------------------------------------------------===//
#include "interception/interception.h"
#include "sanitizer_platform_interceptors.h"

#include <stdarg.h>

#ifdef _WIN32
#define va_copy(dst, src) ((dst) = (src))
#endif // _WIN32

#if SANITIZER_INTERCEPT_READ
INTERCEPTOR(SSIZE_T, read, int fd, void *ptr, SIZE_T count) {
  void *ctx;
  COMMON_INTERCEPTOR_ENTER(ctx, read, fd, ptr, count);
  SSIZE_T res = REAL(read)(fd, ptr, count);
  if (res > 0)
    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, res);
  if (res >= 0 && fd >= 0)
    COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd);
  return res;
}
#define INIT_READ INTERCEPT_FUNCTION(read)
#else
#define INIT_READ
#endif

#if SANITIZER_INTERCEPT_PREAD
INTERCEPTOR(SSIZE_T, pread, int fd, void *ptr, SIZE_T count, OFF_T offset) {
  void *ctx;
  COMMON_INTERCEPTOR_ENTER(ctx, pread, fd, ptr, count, offset);
  SSIZE_T res = REAL(pread)(fd, ptr, count, offset);
  if (res > 0)
    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, res);
  if (res >= 0 && fd >= 0)
    COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd);
  return res;
}
#define INIT_PREAD INTERCEPT_FUNCTION(pread)
#else
#define INIT_PREAD
#endif

#if SANITIZER_INTERCEPT_PREAD64
INTERCEPTOR(SSIZE_T, pread64, int fd, void *ptr, SIZE_T count, OFF64_T offset) {
  void *ctx;
  COMMON_INTERCEPTOR_ENTER(ctx, pread64, fd, ptr, count, offset);
  SSIZE_T res = REAL(pread64)(fd, ptr, count, offset);
  if (res > 0)
    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, res);
  if (res >= 0 && fd >= 0)
    COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd);
  return res;
}
#define INIT_PREAD64 INTERCEPT_FUNCTION(pread64)
#else
#define INIT_PREAD64
#endif

#if SANITIZER_INTERCEPT_WRITE
INTERCEPTOR(SSIZE_T, write, int fd, void *ptr, SIZE_T count) {
  void *ctx;
  COMMON_INTERCEPTOR_ENTER(ctx, write, fd, ptr, count);
  if (fd >= 0)
    COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd);
  SSIZE_T res = REAL(write)(fd, ptr, count);
  if (res > 0)
    COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, res);
  return res;
}
#define INIT_WRITE INTERCEPT_FUNCTION(write)
#else
#define INIT_WRITE
#endif

#if SANITIZER_INTERCEPT_PWRITE
INTERCEPTOR(SSIZE_T, pwrite, int fd, void *ptr, SIZE_T count, OFF_T offset) {
  void *ctx;
  COMMON_INTERCEPTOR_ENTER(ctx, pwrite, fd, ptr, count, offset);
  if (fd >= 0)
    COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd);
  SSIZE_T res = REAL(pwrite)(fd, ptr, count, offset);
  if (res > 0)
    COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, res);
  return res;
}
#define INIT_PWRITE INTERCEPT_FUNCTION(pwrite)
#else
#define INIT_PWRITE
#endif

#if SANITIZER_INTERCEPT_PWRITE64
INTERCEPTOR(SSIZE_T, pwrite64, int fd, void *ptr, OFF64_T count,
            OFF64_T offset) {
  void *ctx;
  COMMON_INTERCEPTOR_ENTER(ctx, pwrite64, fd, ptr, count, offset);
  if (fd >= 0)
    COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd);
  SSIZE_T res = REAL(pwrite64)(fd, ptr, count, offset);
  if (res > 0)
    COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, res);
  return res;
}
#define INIT_PWRITE64 INTERCEPT_FUNCTION(pwrite64)
#else
#define INIT_PWRITE64
#endif

#if SANITIZER_INTERCEPT_PRCTL
INTERCEPTOR(int, prctl, int option, unsigned long arg2,
            unsigned long arg3,                       // NOLINT
            unsigned long arg4, unsigned long arg5) { // NOLINT
  void *ctx;
  COMMON_INTERCEPTOR_ENTER(ctx, prctl, option, arg2, arg3, arg4, arg5);
  static const int PR_SET_NAME = 15;
  int res = REAL(prctl(option, arg2, arg3, arg4, arg5));
  if (option == PR_SET_NAME) {
    char buff[16];
    internal_strncpy(buff, (char *)arg2, 15);
    buff[15] = 0;
    COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, buff);
  }
  return res;
}
#define INIT_PRCTL INTERCEPT_FUNCTION(prctl)
#else
#define INIT_PRCTL
#endif // SANITIZER_INTERCEPT_PRCTL

#if SANITIZER_INTERCEPT_SCANF

#include "sanitizer_common_interceptors_scanf.inc"

#define VSCANF_INTERCEPTOR_IMPL(vname, allowGnuMalloc, ...)                    \
  {                                                                            \
    void *ctx;                                                                 \
    COMMON_INTERCEPTOR_ENTER(ctx, vname, __VA_ARGS__);                         \
    va_list aq;                                                                \
    va_copy(aq, ap);                                                           \
    int res = REAL(vname)(__VA_ARGS__);                                        \
    if (res > 0)                                                               \
      scanf_common(ctx, res, allowGnuMalloc, format, aq);                      \
    va_end(aq);                                                                \
    return res;                                                                \
  }

INTERCEPTOR(int, vscanf, const char *format, va_list ap)
VSCANF_INTERCEPTOR_IMPL(vscanf, true, format, ap)

INTERCEPTOR(int, vsscanf, const char *str, const char *format, va_list ap)
VSCANF_INTERCEPTOR_IMPL(vsscanf, true, str, format, ap)

INTERCEPTOR(int, vfscanf, void *stream, const char *format, va_list ap)
VSCANF_INTERCEPTOR_IMPL(vfscanf, true, stream, format, ap)

INTERCEPTOR(int, __isoc99_vscanf, const char *format, va_list ap)
VSCANF_INTERCEPTOR_IMPL(__isoc99_vscanf, false, format, ap)

INTERCEPTOR(int, __isoc99_vsscanf, const char *str, const char *format,
            va_list ap)
VSCANF_INTERCEPTOR_IMPL(__isoc99_vsscanf, false, str, format, ap)

INTERCEPTOR(int, __isoc99_vfscanf, void *stream, const char *format, va_list ap)
VSCANF_INTERCEPTOR_IMPL(__isoc99_vfscanf, false, stream, format, ap)

#define SCANF_INTERCEPTOR_IMPL(name, vname, ...)                               \
  {                                                                            \
    void *ctx;                                                                 \
    COMMON_INTERCEPTOR_ENTER(ctx, name, __VA_ARGS__);                          \
    va_list ap;                                                                \
    va_start(ap, format);                                                      \
    int res = vname(__VA_ARGS__, ap);                                          \
    va_end(ap);                                                                \
    return res;                                                                \
  }

INTERCEPTOR(int, scanf, const char *format, ...)
SCANF_INTERCEPTOR_IMPL(scanf, vscanf, format)

INTERCEPTOR(int, fscanf, void *stream, const char *format, ...)
SCANF_INTERCEPTOR_IMPL(fscanf, vfscanf, stream, format)

INTERCEPTOR(int, sscanf, const char *str, const char *format, ...)
SCANF_INTERCEPTOR_IMPL(sscanf, vsscanf, str, format)

INTERCEPTOR(int, __isoc99_scanf, const char *format, ...)
SCANF_INTERCEPTOR_IMPL(__isoc99_scanf, __isoc99_vscanf, format)

INTERCEPTOR(int, __isoc99_fscanf, void *stream, const char *format, ...)
SCANF_INTERCEPTOR_IMPL(__isoc99_fscanf, __isoc99_vfscanf, stream, format)

INTERCEPTOR(int, __isoc99_sscanf, const char *str, const char *format, ...)
SCANF_INTERCEPTOR_IMPL(__isoc99_sscanf, __isoc99_vsscanf, str, format)

#define INIT_SCANF                                                             \
  INTERCEPT_FUNCTION(scanf);                                                   \
  INTERCEPT_FUNCTION(sscanf);                                                  \
  INTERCEPT_FUNCTION(fscanf);                                                  \
  INTERCEPT_FUNCTION(vscanf);                                                  \
  INTERCEPT_FUNCTION(vsscanf);                                                 \
  INTERCEPT_FUNCTION(vfscanf);                                                 \
  INTERCEPT_FUNCTION(__isoc99_scanf);                                          \
  INTERCEPT_FUNCTION(__isoc99_sscanf);                                         \
  INTERCEPT_FUNCTION(__isoc99_fscanf);                                         \
  INTERCEPT_FUNCTION(__isoc99_vscanf);                                         \
  INTERCEPT_FUNCTION(__isoc99_vsscanf);                                        \
  INTERCEPT_FUNCTION(__isoc99_vfscanf);

#else
#define INIT_SCANF
#endif

#define SANITIZER_COMMON_INTERCEPTORS_INIT                                     \
  INIT_READ;                                                                   \
  INIT_PREAD;                                                                  \
  INIT_PREAD64;                                                                \
  INIT_PRCTL;                                                                  \
  INIT_WRITE;                                                                  \
  INIT_PWRITE;                                                                 \
  INIT_PWRITE64;                                                               \
  INIT_SCANF;