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- 6194c9b0d6dbdbeeb27b19d5c61562f985b25ff2 Removing support for NaCL in dynamic_annotations.h. by Abseil Team <absl-team@google.com>

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- 6f89386971a21422c4cd9653e965c96d9f7a3573 Fix handling of VDSOs that are loaded lower then their li... by Abseil Team <absl-team@google.com>
  - f27a7269ab714c9c75fe4e15fa1bce8b12531a92 Check that __GLIBC__ is defined before checking for __GLI... by Derek Mauro <dmauro@google.com>

GitOrigin-RevId: 6194c9b0d6dbdbeeb27b19d5c61562f985b25ff2
Change-Id: I3eceb6f76bf2b25d55d1f5f77fba57af947da0cf
This commit is contained in:
Abseil Team 2018-05-14 07:57:58 -07:00 • committed by jueminyang
parent dd9911a004
commit add89fd0e4
3 changed files with 3 additions and 42 deletions
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22
absl/debugging/internal/elf_mem_image.cc
View file

@ -121,7 +121,7 @@ const void *ElfMemImage::GetSymAddr(const ElfW(Sym) *sym) const {
return reinterpret_cast<const void *>(sym->st_value);
}
ABSL_RAW_CHECK(link_base_ < sym->st_value, "symbol out of range");
return GetTableElement<char>(ehdr_, 0, 1, sym->st_value) - link_base_;
return GetTableElement<char>(ehdr_, 0, 1, sym->st_value - link_base_);
}
const ElfW(Verdef) *ElfMemImage::GetVerdef(int index) const {
@ -161,10 +161,6 @@ void ElfMemImage::Init(const void *base) {
if (!base) {
return;
}
const intptr_t base_as_uintptr_t = reinterpret_cast<uintptr_t>(base);
// Fake VDSO has low bit set.
const bool fake_vdso = ((base_as_uintptr_t & 1) != 0);
base = reinterpret_cast<const void *>(base_as_uintptr_t & ~1);
const char *const base_as_char = reinterpret_cast<const char *>(base);
if (base_as_char[EI_MAG0] != ELFMAG0 || base_as_char[EI_MAG1] != ELFMAG1 ||
base_as_char[EI_MAG2] != ELFMAG2 || base_as_char[EI_MAG3] != ELFMAG3) {
@ -224,21 +220,7 @@ void ElfMemImage::Init(const void *base) {
reinterpret_cast<ElfW(Dyn) *>(dynamic_program_header->p_vaddr +
relocation);
for (; dynamic_entry->d_tag != DT_NULL; ++dynamic_entry) {
ElfW(Xword) value = dynamic_entry->d_un.d_val;
if (fake_vdso) {
// A complication: in the real VDSO, dynamic entries are not relocated
// (it wasn't loaded by a dynamic loader). But when testing with a
// "fake" dlopen()ed vdso library, the loader relocates some (but
// not all!) of them before we get here.
if (dynamic_entry->d_tag == DT_VERDEF) {
// The only dynamic entry (of the ones we care about) libc-2.3.6
// loader doesn't relocate.
value += relocation;
}
} else {
// Real VDSO. Everything needs to be relocated.
value += relocation;
}
const ElfW(Xword) value = dynamic_entry->d_un.d_val + relocation;
switch (dynamic_entry->d_tag) {
case DT_HASH:
hash_ = reinterpret_cast<ElfW(Word) *>(value);