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.
 30#include <linux/posix_types.h>
 31#  if defined(__x86_64__) || defined(__mips__) || defined(__hexagon__)
 32#    include <sys/stat.h>
 33#  else
 34#    define ino_t __kernel_ino_t
 35#    define mode_t __kernel_mode_t
 36#    define nlink_t __kernel_nlink_t
 37#    define uid_t __kernel_uid_t
 38#    define gid_t __kernel_gid_t
 39#    define off_t __kernel_off_t
 40#    define time_t __kernel_time_t
 41// This header seems to contain the definitions of _kernel_ stat* structs.
 42#    include <asm/stat.h>
 43#    undef ino_t
 44#    undef mode_t
 45#    undef nlink_t
 46#    undef uid_t
 47#    undef gid_t
 48#    undef off_t
 49#  endif
 50
 51#  include <linux/aio_abi.h>
 52
 53#  if !SANITIZER_ANDROID
 54#    include <sys/statfs.h>
 55#    include <linux/perf_event.h>
 56#  endif
 57
 58using namespace __sanitizer;
 59
 60#  if !defined(__powerpc64__) && !defined(__x86_64__) &&                   \
 61      !defined(__aarch64__) && !defined(__mips__) && !defined(__s390__) && \
 62      !defined(__sparc__) && !defined(__riscv) && !defined(__hexagon__) && \
 63      !defined(__loongarch__)
 64COMPILER_CHECK(struct___old_kernel_stat_sz == sizeof(struct __old_kernel_stat));
 65#endif
 66
 67COMPILER_CHECK(struct_kernel_stat_sz == sizeof(struct stat));
 68
 69#if defined(__i386__)
 70COMPILER_CHECK(struct_kernel_stat64_sz == sizeof(struct stat64));
 71#endif
 72
 73CHECK_TYPE_SIZE(io_event);
 74CHECK_SIZE_AND_OFFSET(io_event, data);
 75CHECK_SIZE_AND_OFFSET(io_event, obj);
 76CHECK_SIZE_AND_OFFSET(io_event, res);
 77CHECK_SIZE_AND_OFFSET(io_event, res2);
 78
 79#if !SANITIZER_ANDROID
 80COMPILER_CHECK(sizeof(struct __sanitizer_perf_event_attr) <=
 81               sizeof(struct perf_event_attr));
 82CHECK_SIZE_AND_OFFSET(perf_event_attr, type);
 83CHECK_SIZE_AND_OFFSET(perf_event_attr, size);
 84#endif
 85
 86COMPILER_CHECK(iocb_cmd_pread == IOCB_CMD_PREAD);
 87COMPILER_CHECK(iocb_cmd_pwrite == IOCB_CMD_PWRITE);
 88#if !SANITIZER_ANDROID
 89COMPILER_CHECK(iocb_cmd_preadv == IOCB_CMD_PREADV);
 90COMPILER_CHECK(iocb_cmd_pwritev == IOCB_CMD_PWRITEV);
 91#endif
 92
 93CHECK_TYPE_SIZE(iocb);
 94CHECK_SIZE_AND_OFFSET(iocb, aio_data);
 95// Skip aio_key, it's weird.
 96CHECK_SIZE_AND_OFFSET(iocb, aio_lio_opcode);
 97CHECK_SIZE_AND_OFFSET(iocb, aio_reqprio);
 98CHECK_SIZE_AND_OFFSET(iocb, aio_fildes);
 99CHECK_SIZE_AND_OFFSET(iocb, aio_buf);
100CHECK_SIZE_AND_OFFSET(iocb, aio_nbytes);
101CHECK_SIZE_AND_OFFSET(iocb, aio_offset);
102
103#endif  // SANITIZER_LINUX