libsanitizer/sanitizer_common/sanitizer_platform_limits_linux.cpp

   1 //===-- sanitizer_platform_limits_linux.cpp -------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of Sanitizer common code.
  10 //
  11 // Sizes and layouts of linux kernel data structures.
  12 //===----------------------------------------------------------------------===//
  13
  14 // This is a separate compilation unit for linux headers that conflict with
  15 // userspace headers.
  16 // Most "normal" includes go in sanitizer_platform_limits_posix.cpp
  17
  18 #include "sanitizer_platform.h"
  19 #if SANITIZER_LINUX
  20
  21 #include "sanitizer_internal_defs.h"
  22 #include "sanitizer_platform_limits_posix.h"
  23
  24 // For offsetof -> __builtin_offsetof definition.
  25 #include <stddef.h>
  26
  27 // With old kernels (and even new kernels on powerpc) asm/stat.h uses types that
  28 // are not defined anywhere in userspace headers. Fake them. This seems to work
  29 // fine with newer headers, too.  Beware that with <sys/stat.h>, struct stat
  30 // takes the form of struct stat64 on 32-bit platforms if _FILE_OFFSET_BITS=64.
  31 // Also, for some platforms (e.g. mips) there are additional members in the
  32 // <sys/stat.h> struct stat:s.
  33 #include <linux/posix_types.h>
  34 #  if defined(__x86_64__) || defined(__mips__) || defined(__hexagon__)
  35 #    include <sys/stat.h>
  36 #  else
  37 #    define ino_t __kernel_ino_t
  38 #    define mode_t __kernel_mode_t
  39 #    define nlink_t __kernel_nlink_t
  40 #    define uid_t __kernel_uid_t
  41 #    define gid_t __kernel_gid_t
  42 #    define off_t __kernel_off_t
  43 #    define time_t __kernel_time_t
  44 // This header seems to contain the definitions of _kernel_ stat* structs.
  45 #    include <asm/stat.h>
  46 #    undef ino_t
  47 #    undef mode_t
  48 #    undef nlink_t
  49 #    undef uid_t
  50 #    undef gid_t
  51 #    undef off_t
  52 #  endif
  53
  54 #  include <linux/aio_abi.h>
  55
  56 #  if !SANITIZER_ANDROID
  57 #    include <sys/statfs.h>
  58 #    include <linux/perf_event.h>
  59 #  endif
  60
  61 using namespace __sanitizer;
  62
  63 #  if !defined(__powerpc64__) && !defined(__x86_64__) &&                   \
  64       !defined(__aarch64__) && !defined(__mips__) && !defined(__s390__) && \
  65       !defined(__sparc__) && !defined(__riscv) && !defined(__hexagon__) && \
  66       !defined(__loongarch__)
  67 COMPILER_CHECK(struct___old_kernel_stat_sz == sizeof(struct __old_kernel_stat));
  68 #endif
  69
  70 COMPILER_CHECK(struct_kernel_stat_sz == sizeof(struct stat));
  71
  72 #if defined(__i386__)
  73 COMPILER_CHECK(struct_kernel_stat64_sz == sizeof(struct stat64));
  74 #endif
  75
  76 CHECK_TYPE_SIZE(io_event);
  77 CHECK_SIZE_AND_OFFSET(io_event, data);
  78 CHECK_SIZE_AND_OFFSET(io_event, obj);
  79 CHECK_SIZE_AND_OFFSET(io_event, res);
  80 CHECK_SIZE_AND_OFFSET(io_event, res2);
  81
  82 #if !SANITIZER_ANDROID
  83 COMPILER_CHECK(sizeof(struct __sanitizer_perf_event_attr) <=
  84                sizeof(struct perf_event_attr));
  85 CHECK_SIZE_AND_OFFSET(perf_event_attr, type);
  86 CHECK_SIZE_AND_OFFSET(perf_event_attr, size);
  87 #endif
  88
  89 COMPILER_CHECK(iocb_cmd_pread == IOCB_CMD_PREAD);
  90 COMPILER_CHECK(iocb_cmd_pwrite == IOCB_CMD_PWRITE);
  91 #if !SANITIZER_ANDROID
  92 COMPILER_CHECK(iocb_cmd_preadv == IOCB_CMD_PREADV);
  93 COMPILER_CHECK(iocb_cmd_pwritev == IOCB_CMD_PWRITEV);
  94 #endif
  95
  96 CHECK_TYPE_SIZE(iocb);
  97 CHECK_SIZE_AND_OFFSET(iocb, aio_data);
  98 // Skip aio_key, it's weird.
  99 CHECK_SIZE_AND_OFFSET(iocb, aio_lio_opcode);
 100 CHECK_SIZE_AND_OFFSET(iocb, aio_reqprio);
 101 CHECK_SIZE_AND_OFFSET(iocb, aio_fildes);
 102 CHECK_SIZE_AND_OFFSET(iocb, aio_buf);
 103 CHECK_SIZE_AND_OFFSET(iocb, aio_nbytes);
 104 CHECK_SIZE_AND_OFFSET(iocb, aio_offset);
 105
 106 #endif  // SANITIZER_LINUX