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android: handle RELRO sharing by the Chromium linker

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Bug: crashpad:253
Change-Id: I7d6b1bfebe621d90a4b69dd44073abf471fa822c
Reviewed-on: https://chromium-review.googlesource.com/1232293
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
This commit is contained in:
Joshua Peraza 2018-09-20 09:16:22 -07:00 committed by Commit Bot
parent 8595f4b423
commit 9ae453628f
1 changed files with 31 additions and 0 deletions
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31
util/linux/memory_map.cc
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@ -316,6 +316,37 @@ std::vector<const MemoryMap::Mapping*> MemoryMap::FindFilePossibleMmapStarts(
return std::vector<const Mapping*>();
}
#if defined(OS_ANDROID)
// The Android Chromium linker uses ashmem to share RELRO segments between
// processes. The original RELRO segment has been unmapped and replaced with a
// mapping named "/dev/ashmem/RELRO:<libname>" where <libname> is the base
// library name (e.g. libchrome.so) sans any preceding path that may be
// present in other mappings for the library.
// https://crashpad.chromium.org/bug/253
static constexpr char kRelro[] = "/dev/ashmem/RELRO:";
if (mapping.name.compare(0, strlen(kRelro), kRelro, 0, strlen(kRelro)) == 0) {
// The kernel appends "(deleted)" to ashmem mappings because there isn't
// any corresponding file on the filesystem.
static constexpr char kDeleted[] = " (deleted)";
size_t libname_end = mapping.name.rfind(kDeleted);
DCHECK_NE(libname_end, std::string::npos);
if (libname_end == std::string::npos) {
libname_end = mapping.name.size();
}
std::string libname =
mapping.name.substr(strlen(kRelro), libname_end - strlen(kRelro));
for (const auto& candidate : mappings_) {
if (candidate.name.rfind(libname) != std::string::npos) {
possible_starts.push_back(&candidate);
}
if (mapping.Equals(candidate)) {
return possible_starts;
}
}
}
#endif // OS_ANDROID
for (const auto& candidate : mappings_) {
if (candidate.device == mapping.device &&
candidate.inode == mapping.inode &&