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📁 ..
📄 sancov_flags.cpp(1.64 KB)
📄 sancov_flags.h(1.08 KB)
📄 sancov_flags.inc(777 B)
📄 sanitizer_addrhashmap.h(9.19 KB)
📄 sanitizer_allocator.cpp(8.73 KB)
📄 sanitizer_allocator.h(2.69 KB)
📄 sanitizer_allocator_bytemap.h(3.12 KB)
📄 sanitizer_allocator_checks.cpp(686 B)
📄 sanitizer_allocator_checks.h(2.67 KB)
📄 sanitizer_allocator_combined.h(6.29 KB)
📄 sanitizer_allocator_interface.h(1.83 KB)
📄 sanitizer_allocator_internal.h(2.03 KB)
📄 sanitizer_allocator_local_cache.h(8.95 KB)
📄 sanitizer_allocator_primary32.h(12.64 KB)
📄 sanitizer_allocator_primary64.h(32.71 KB)
📄 sanitizer_allocator_report.cpp(4.68 KB)
📄 sanitizer_allocator_report.h(1.72 KB)
📄 sanitizer_allocator_secondary.h(10.78 KB)
📄 sanitizer_allocator_size_class_map.h(10.12 KB)
📄 sanitizer_allocator_stats.h(2.76 KB)
📄 sanitizer_asm.h(2.57 KB)
📄 sanitizer_atomic.h(1.97 KB)
📄 sanitizer_atomic_clang.h(3.42 KB)
📄 sanitizer_atomic_clang_mips.h(3.77 KB)
📄 sanitizer_atomic_clang_other.h(3.02 KB)
📄 sanitizer_atomic_clang_x86.h(3.77 KB)
📄 sanitizer_atomic_msvc.h(8.53 KB)
📄 sanitizer_bitvector.h(9.43 KB)
📄 sanitizer_bvgraph.h(4.62 KB)
📄 sanitizer_common.cpp(10.13 KB)
📄 sanitizer_common.h(30.64 KB)
📄 sanitizer_common_interceptors.inc(348.66 KB)
📄 sanitizer_common_interceptors_format.inc(16.84 KB)
📄 sanitizer_common_interceptors_ioctl.inc(22.13 KB)
📄 sanitizer_common_interceptors_netbsd_compat.inc(4.07 KB)
📄 sanitizer_common_interceptors_vfork_aarch64.inc.S(1.23 KB)
📄 sanitizer_common_interceptors_vfork_arm.inc.S(1.24 KB)
📄 sanitizer_common_interceptors_vfork_i386.inc.S(1.66 KB)
📄 sanitizer_common_interceptors_vfork_x86_64.inc.S(1.03 KB)
📄 sanitizer_common_interface.inc(2.05 KB)
📄 sanitizer_common_interface_posix.inc(732 B)
📄 sanitizer_common_libcdep.cpp(5.4 KB)
📄 sanitizer_common_nolibc.cpp(1.12 KB)
📄 sanitizer_common_syscalls.inc(85 KB)
📄 sanitizer_coverage_fuchsia.cpp(10.1 KB)
📄 sanitizer_coverage_interface.inc(1.73 KB)
📄 sanitizer_coverage_libcdep_new.cpp(7.39 KB)
📄 sanitizer_coverage_win_dll_thunk.cpp(1.03 KB)
📄 sanitizer_coverage_win_dynamic_runtime_thunk.cpp(1.16 KB)
📄 sanitizer_coverage_win_sections.cpp(3.36 KB)
📄 sanitizer_coverage_win_weak_interception.cpp(1.17 KB)
📄 sanitizer_dbghelp.h(1.44 KB)
📄 sanitizer_deadlock_detector.h(13.28 KB)
📄 sanitizer_deadlock_detector1.cpp(5.6 KB)
📄 sanitizer_deadlock_detector2.cpp(10.84 KB)
📄 sanitizer_deadlock_detector_interface.h(2.66 KB)
📄 sanitizer_errno.cpp(1.09 KB)
📄 sanitizer_errno.h(1.3 KB)
📄 sanitizer_errno_codes.h(1.1 KB)
📄 sanitizer_file.cpp(6.24 KB)
📄 sanitizer_file.h(3.67 KB)
📄 sanitizer_flag_parser.cpp(5.55 KB)
📄 sanitizer_flag_parser.h(5.71 KB)
📄 sanitizer_flags.cpp(3.95 KB)
📄 sanitizer_flags.h(2.13 KB)
📄 sanitizer_flags.inc(12.73 KB)
📄 sanitizer_freebsd.h(3.31 KB)
📄 sanitizer_fuchsia.cpp(16.58 KB)
📄 sanitizer_fuchsia.h(1.03 KB)
📄 sanitizer_getauxval.h(1.73 KB)
📄 sanitizer_glibc_version.h(748 B)
📄 sanitizer_hash.h(1.04 KB)
📄 sanitizer_interceptors_ioctl_netbsd.inc(68.81 KB)
📄 sanitizer_interface_internal.h(5.28 KB)
📄 sanitizer_internal_defs.h(14.28 KB)
📄 sanitizer_lfstack.h(2.08 KB)
📄 sanitizer_libc.cpp(7.21 KB)
📄 sanitizer_libc.h(3.23 KB)
📄 sanitizer_libignore.cpp(4.24 KB)
📄 sanitizer_libignore.h(3.5 KB)
📄 sanitizer_linux.cpp(71.58 KB)
📄 sanitizer_linux.h(5.47 KB)
📄 sanitizer_linux_libcdep.cpp(25.67 KB)
📄 sanitizer_linux_s390.cpp(6.91 KB)
📄 sanitizer_list.h(3.81 KB)
📄 sanitizer_local_address_space_view.h(3.67 KB)
📄 sanitizer_mac.cpp(38.67 KB)
📄 sanitizer_mac.h(2.49 KB)
📄 sanitizer_mac_libcdep.cpp(968 B)
📄 sanitizer_malloc_mac.inc(13.06 KB)
📄 sanitizer_mutex.h(5.17 KB)
📄 sanitizer_netbsd.cpp(9.95 KB)
📄 sanitizer_openbsd.cpp(3.17 KB)
📄 sanitizer_persistent_allocator.cpp(687 B)
📄 sanitizer_persistent_allocator.h(2.31 KB)
📄 sanitizer_placement_new.h(885 B)
📄 sanitizer_platform.h(10.11 KB)
📄 sanitizer_platform_interceptors.h(24.93 KB)
📄 sanitizer_platform_limits_freebsd.cpp(19.79 KB)
📄 sanitizer_platform_limits_freebsd.h(18.41 KB)
📄 sanitizer_platform_limits_linux.cpp(3.32 KB)
📄 sanitizer_platform_limits_netbsd.cpp(109.73 KB)
📄 sanitizer_platform_limits_netbsd.h(81.54 KB)
📄 sanitizer_platform_limits_openbsd.cpp(8.69 KB)
📄 sanitizer_platform_limits_openbsd.h(8.68 KB)
📄 sanitizer_platform_limits_posix.cpp(48.89 KB)
📄 sanitizer_platform_limits_posix.h(40.65 KB)
📄 sanitizer_platform_limits_solaris.cpp(11.93 KB)
📄 sanitizer_platform_limits_solaris.h(12.26 KB)
📄 sanitizer_posix.cpp(11.93 KB)
📄 sanitizer_posix.h(5.14 KB)
📄 sanitizer_posix_libcdep.cpp(16.21 KB)
📄 sanitizer_printf.cpp(12.07 KB)
📄 sanitizer_procmaps.h(2.93 KB)
📄 sanitizer_procmaps_bsd.cpp(3.81 KB)
📄 sanitizer_procmaps_common.cpp(5.27 KB)
📄 sanitizer_procmaps_fuchsia.cpp(2.51 KB)
📄 sanitizer_procmaps_linux.cpp(2.9 KB)
📄 sanitizer_procmaps_mac.cpp(13.7 KB)
📄 sanitizer_procmaps_solaris.cpp(2.18 KB)
📄 sanitizer_ptrauth.h(720 B)
📄 sanitizer_quarantine.h(9.57 KB)
📄 sanitizer_report_decorator.h(1.89 KB)
📄 sanitizer_ring_buffer.h(4.7 KB)
📄 sanitizer_rtems.cpp(7.61 KB)
📄 sanitizer_rtems.h(772 B)
📄 sanitizer_signal_interceptors.inc(2.89 KB)
📄 sanitizer_solaris.cpp(6.6 KB)
📄 sanitizer_stackdepot.cpp(4.54 KB)
📄 sanitizer_stackdepot.h(2.13 KB)
📄 sanitizer_stackdepotbase.h(5.58 KB)
📄 sanitizer_stacktrace.cpp(4.58 KB)
📄 sanitizer_stacktrace.h(5.65 KB)
📄 sanitizer_stacktrace_libcdep.cpp(5.54 KB)
📄 sanitizer_stacktrace_printer.cpp(9.08 KB)
📄 sanitizer_stacktrace_printer.h(3.08 KB)
📄 sanitizer_stacktrace_sparc.cpp(3.05 KB)
📄 sanitizer_stoptheworld.h(2.34 KB)
📄 sanitizer_stoptheworld_fuchsia.cpp(1.28 KB)
📄 sanitizer_stoptheworld_linux_libcdep.cpp(20.8 KB)
📄 sanitizer_stoptheworld_mac.cpp(5.29 KB)
📄 sanitizer_stoptheworld_netbsd_libcdep.cpp(11.02 KB)
📄 sanitizer_suppressions.cpp(5.67 KB)
📄 sanitizer_suppressions.h(1.69 KB)
📄 sanitizer_symbolizer.cpp(3.65 KB)
📄 sanitizer_symbolizer.h(6.62 KB)
📄 sanitizer_symbolizer_fuchsia.h(1.56 KB)
📄 sanitizer_symbolizer_internal.h(5.8 KB)
📄 sanitizer_symbolizer_libbacktrace.cpp(6.1 KB)
📄 sanitizer_symbolizer_libbacktrace.h(1.49 KB)
📄 sanitizer_symbolizer_libcdep.cpp(17.45 KB)
📄 sanitizer_symbolizer_mac.cpp(8.48 KB)
📄 sanitizer_symbolizer_mac.h(1.37 KB)
📄 sanitizer_symbolizer_markup.cpp(5.39 KB)
📄 sanitizer_symbolizer_posix_libcdep.cpp(16.5 KB)
📄 sanitizer_symbolizer_report.cpp(10.01 KB)
📄 sanitizer_symbolizer_rtems.h(1.56 KB)
📄 sanitizer_symbolizer_win.cpp(11.59 KB)
📄 sanitizer_syscall_generic.inc(1.06 KB)
📄 sanitizer_syscall_linux_aarch64.inc(4.58 KB)
📄 sanitizer_syscall_linux_arm.inc(4.58 KB)
📄 sanitizer_syscall_linux_x86_64.inc(3.07 KB)
📄 sanitizer_syscalls_netbsd.inc(120.97 KB)
📄 sanitizer_termination.cpp(2.86 KB)
📄 sanitizer_thread_registry.cpp(10.31 KB)
📄 sanitizer_thread_registry.h(5.44 KB)
📄 sanitizer_tls_get_addr.cpp(5.29 KB)
📄 sanitizer_tls_get_addr.h(2.21 KB)
📄 sanitizer_type_traits.cpp(708 B)
📄 sanitizer_type_traits.h(1.49 KB)
📄 sanitizer_unwind_linux_libcdep.cpp(6.13 KB)
📄 sanitizer_unwind_win.cpp(2.41 KB)
📄 sanitizer_vector.h(2.57 KB)
📄 sanitizer_win.cpp(33.3 KB)
📄 sanitizer_win.h(851 B)
📄 sanitizer_win_defs.h(7.23 KB)
📄 sanitizer_win_dll_thunk.cpp(3.41 KB)
📄 sanitizer_win_dll_thunk.h(11.13 KB)
📄 sanitizer_win_dynamic_runtime_thunk.cpp(1.16 KB)
📄 sanitizer_win_weak_interception.cpp(3.49 KB)
📄 sanitizer_win_weak_interception.h(1.64 KB)
📁 symbolizer
📄 weak_symbols.txt(230 B)

Editing: sanitizer_tls_get_addr.cpp

//===-- sanitizer_tls_get_addr.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
//
//===----------------------------------------------------------------------===//
//
// Handle the __tls_get_addr call.
//
//===----------------------------------------------------------------------===//

#include "sanitizer_tls_get_addr.h"

#include "sanitizer_flags.h"
#include "sanitizer_platform_interceptors.h"

namespace __sanitizer {
#if SANITIZER_INTERCEPT_TLS_GET_ADDR

// The actual parameter that comes to __tls_get_addr
// is a pointer to a struct with two words in it:
struct TlsGetAddrParam {
  uptr dso_id;
  uptr offset;
};

// Glibc starting from 2.19 allocates tls using __signal_safe_memalign,
// which has such header.
struct Glibc_2_19_tls_header {
  uptr size;
  uptr start;
};

// This must be static TLS
__attribute__((tls_model("initial-exec")))
static __thread DTLS dtls;

// Make sure we properly destroy the DTLS objects:
// this counter should never get too large.
static atomic_uintptr_t number_of_live_dtls;

static const uptr kDestroyedThread = -1;

static inline void DTLS_Deallocate(DTLS::DTV *dtv, uptr size) {
  if (!size) return;
  VReport(2, "__tls_get_addr: DTLS_Deallocate %p %zd\n", dtv, size);
  UnmapOrDie(dtv, size * sizeof(DTLS::DTV));
  atomic_fetch_sub(&number_of_live_dtls, 1, memory_order_relaxed);
}

static inline void DTLS_Resize(uptr new_size) {
  if (dtls.dtv_size >= new_size) return;
  new_size = RoundUpToPowerOfTwo(new_size);
  new_size = Max(new_size, 4096UL / sizeof(DTLS::DTV));
  DTLS::DTV *new_dtv =
      (DTLS::DTV *)MmapOrDie(new_size * sizeof(DTLS::DTV), "DTLS_Resize");
  uptr num_live_dtls =
      atomic_fetch_add(&number_of_live_dtls, 1, memory_order_relaxed);
  VReport(2, "__tls_get_addr: DTLS_Resize %p %zd\n", &dtls, num_live_dtls);
  CHECK_LT(num_live_dtls, 1 << 20);
  uptr old_dtv_size = dtls.dtv_size;
  DTLS::DTV *old_dtv = dtls.dtv;
  if (old_dtv_size)
    internal_memcpy(new_dtv, dtls.dtv, dtls.dtv_size * sizeof(DTLS::DTV));
  dtls.dtv = new_dtv;
  dtls.dtv_size = new_size;
  if (old_dtv_size)
    DTLS_Deallocate(old_dtv, old_dtv_size);
}

void DTLS_Destroy() {
  if (!common_flags()->intercept_tls_get_addr) return;
  VReport(2, "__tls_get_addr: DTLS_Destroy %p %zd\n", &dtls, dtls.dtv_size);
  uptr s = dtls.dtv_size;
  dtls.dtv_size = kDestroyedThread;  // Do this before unmap for AS-safety.
  DTLS_Deallocate(dtls.dtv, s);
}

#if defined(__powerpc64__) || defined(__mips__)
// This is glibc's TLS_DTV_OFFSET:
// "Dynamic thread vector pointers point 0x8000 past the start of each
//  TLS block."
static const uptr kDtvOffset = 0x8000;
#else
static const uptr kDtvOffset = 0;
#endif

DTLS::DTV *DTLS_on_tls_get_addr(void *arg_void, void *res,
                                uptr static_tls_begin, uptr static_tls_end) {
  if (!common_flags()->intercept_tls_get_addr) return 0;
  TlsGetAddrParam *arg = reinterpret_cast<TlsGetAddrParam *>(arg_void);
  uptr dso_id = arg->dso_id;
  if (dtls.dtv_size == kDestroyedThread) return 0;
  DTLS_Resize(dso_id + 1);
  if (dtls.dtv[dso_id].beg) return 0;
  uptr tls_size = 0;
  uptr tls_beg = reinterpret_cast<uptr>(res) - arg->offset - kDtvOffset;
  VReport(2, "__tls_get_addr: %p {%p,%p} => %p; tls_beg: %p; sp: %p "
             "num_live_dtls %zd\n",
          arg, arg->dso_id, arg->offset, res, tls_beg, &tls_beg,
          atomic_load(&number_of_live_dtls, memory_order_relaxed));
  if (dtls.last_memalign_ptr == tls_beg) {
    tls_size = dtls.last_memalign_size;
    VReport(2, "__tls_get_addr: glibc <=2.18 suspected; tls={%p,%p}\n",
        tls_beg, tls_size);
  } else if (tls_beg >= static_tls_begin && tls_beg < static_tls_end) {
    // This is the static TLS block which was initialized / unpoisoned at thread
    // creation.
    VReport(2, "__tls_get_addr: static tls: %p\n", tls_beg);
    tls_size = 0;
  } else if ((tls_beg % 4096) == sizeof(Glibc_2_19_tls_header)) {
    // We may want to check gnu_get_libc_version().
    Glibc_2_19_tls_header *header = (Glibc_2_19_tls_header *)tls_beg - 1;
    tls_size = header->size;
    tls_beg = header->start;
    VReport(2, "__tls_get_addr: glibc >=2.19 suspected; tls={%p %p}\n",
        tls_beg, tls_size);
  } else {
    VReport(2, "__tls_get_addr: Can't guess glibc version\n");
    // This may happen inside the DTOR of main thread, so just ignore it.
    tls_size = 0;
  }
  dtls.dtv[dso_id].beg = tls_beg;
  dtls.dtv[dso_id].size = tls_size;
  return dtls.dtv + dso_id;
}

void DTLS_on_libc_memalign(void *ptr, uptr size) {
  if (!common_flags()->intercept_tls_get_addr) return;
  VReport(2, "DTLS_on_libc_memalign: %p %p\n", ptr, size);
  dtls.last_memalign_ptr = reinterpret_cast<uptr>(ptr);
  dtls.last_memalign_size = size;
}

DTLS *DTLS_Get() { return &dtls; }

bool DTLSInDestruction(DTLS *dtls) {
  return dtls->dtv_size == kDestroyedThread;
}

#else
void DTLS_on_libc_memalign(void *ptr, uptr size) {}
DTLS::DTV *DTLS_on_tls_get_addr(void *arg, void *res,
  unsigned long, unsigned long) { return 0; }
DTLS *DTLS_Get() { return 0; }
void DTLS_Destroy() {}
bool DTLSInDestruction(DTLS *dtls) {
  UNREACHABLE("dtls is unsupported on this platform!");
}

#endif  // SANITIZER_INTERCEPT_TLS_GET_ADDR

}  // namespace __sanitizer

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Editing: sanitizer_tls_get_addr.cpp

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