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📄 hwasan.cpp(15.25 KB)
📄 hwasan.h(5.69 KB)
📄 hwasan.syms.extra(21 B)
📄 hwasan_allocator.cpp(13.71 KB)
📄 hwasan_allocator.h(3.26 KB)
📄 hwasan_blacklist.txt(282 B)
📄 hwasan_checks.h(4.04 KB)
📄 hwasan_dynamic_shadow.cpp(5.17 KB)
📄 hwasan_dynamic_shadow.h(838 B)
📄 hwasan_exceptions.cpp(2.68 KB)
📄 hwasan_flags.h(799 B)
📄 hwasan_flags.inc(3.27 KB)
📄 hwasan_globals.cpp(3.03 KB)
📄 hwasan_globals.h(1.85 KB)
📄 hwasan_interceptors.cpp(11.1 KB)
📄 hwasan_interceptors_vfork.S(409 B)
📄 hwasan_interface_internal.h(6.32 KB)
📄 hwasan_linux.cpp(15.83 KB)
📄 hwasan_malloc_bisect.h(1.67 KB)
📄 hwasan_mapping.h(2.01 KB)
📄 hwasan_memintrinsics.cpp(1.6 KB)
📄 hwasan_new_delete.cpp(2.29 KB)
📄 hwasan_poisoning.cpp(1.89 KB)
📄 hwasan_poisoning.h(756 B)
📄 hwasan_report.cpp(24.11 KB)
📄 hwasan_report.h(1.2 KB)
📄 hwasan_setjmp.S(2.81 KB)
📄 hwasan_tag_mismatch_aarch64.S(5.89 KB)
📄 hwasan_thread.cpp(3.9 KB)
📄 hwasan_thread.h(2.82 KB)
📄 hwasan_thread_list.cpp(442 B)
📄 hwasan_thread_list.h(6.2 KB)
📄 hwasan_type_test.cpp(918 B)

Editing: hwasan_globals.cpp

//===-- hwasan_globals.cpp ------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of HWAddressSanitizer.
//
// HWAddressSanitizer globals-specific runtime.
//===----------------------------------------------------------------------===//

#include "hwasan_globals.h"

namespace __hwasan {

enum { NT_LLVM_HWASAN_GLOBALS = 3 };
struct hwasan_global_note {
  s32 begin_relptr;
  s32 end_relptr;
};

// Check that the given library meets the code model requirements for tagged
// globals. These properties are not checked at link time so they need to be
// checked at runtime.
static void CheckCodeModel(ElfW(Addr) base, const ElfW(Phdr) * phdr,
                           ElfW(Half) phnum) {
  ElfW(Addr) min_addr = -1ull, max_addr = 0;
  for (unsigned i = 0; i != phnum; ++i) {
    if (phdr[i].p_type != PT_LOAD)
      continue;
    ElfW(Addr) lo = base + phdr[i].p_vaddr, hi = lo + phdr[i].p_memsz;
    if (min_addr > lo)
      min_addr = lo;
    if (max_addr < hi)
      max_addr = hi;
  }

if (max_addr - min_addr > 1ull << 32) {
    Report("FATAL: HWAddressSanitizer: library size exceeds 2^32\n");
    Die();
  }
  if (max_addr > 1ull << 48) {
    Report("FATAL: HWAddressSanitizer: library loaded above address 2^48\n");
    Die();
  }
}

ArrayRef<const hwasan_global> HwasanGlobalsFor(ElfW(Addr) base,
                                               const ElfW(Phdr) * phdr,
                                               ElfW(Half) phnum) {
  // Read the phdrs from this DSO.
  for (unsigned i = 0; i != phnum; ++i) {
    if (phdr[i].p_type != PT_NOTE)
      continue;

const char *note = reinterpret_cast<const char *>(base + phdr[i].p_vaddr);
    const char *nend = note + phdr[i].p_memsz;

// Traverse all the notes until we find a HWASan note.
    while (note < nend) {
      auto *nhdr = reinterpret_cast<const ElfW(Nhdr) *>(note);
      const char *name = note + sizeof(ElfW(Nhdr));
      const char *desc = name + RoundUpTo(nhdr->n_namesz, 4);

// Discard non-HWASan-Globals notes.
      if (nhdr->n_type != NT_LLVM_HWASAN_GLOBALS ||
          internal_strcmp(name, "LLVM") != 0) {
        note = desc + RoundUpTo(nhdr->n_descsz, 4);
        continue;
      }

// Only libraries with instrumented globals need to be checked against the
      // code model since they use relocations that aren't checked at link time.
      CheckCodeModel(base, phdr, phnum);

auto *global_note = reinterpret_cast<const hwasan_global_note *>(desc);
      auto *globals_begin = reinterpret_cast<const hwasan_global *>(
          note + global_note->begin_relptr);
      auto *globals_end = reinterpret_cast<const hwasan_global *>(
          note + global_note->end_relptr);

return {globals_begin, globals_end};
    }
  }

return {};
}

}  // namespace __hwasan

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