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Skip entries with zero inode when parsing /proc/PID/maps

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This also skips all entries that point to deleted files.

PiperOrigin-RevId: 344244273
Change-Id: Ic47c6ab0dff4eaf4b4dea2779c45685922adc608
This commit is contained in:
Christian Blichmann 2020-11-25 06:46:11 -08:00 committed by Copybara-Service
parent 5001778443
commit 6587e571f1
1 changed files with 24 additions and 21 deletions
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45
sandboxed_api/sandbox2/unwind/unwind.cc
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@ -24,6 +24,7 @@
#include <string>
#include <vector>
#include "absl/strings/match.h"
#include "absl/strings/str_cat.h"
#include "libunwind-ptrace.h"
#include "sandboxed_api/sandbox2/comms.h"
@ -185,27 +186,29 @@ std::vector<std::string> RunLibUnwindAndSymbolizer(pid_t pid,
addr_to_symbol[entry.end] = "";
}
const bool should_parse = entry.is_executable && !entry.path.empty() &&
entry.path != "[vdso]" &&
entry.path != "[vsyscall]";
if (should_parse) {
auto elf_or = ElfFile::ParseFromFile(entry.path, ElfFile::kLoadSymbols);
if (!elf_or.ok()) {
SAPI_RAW_LOG(WARNING, "Could not load symbols for %s: %s", entry.path,
elf_or.status().message());
continue;
}
auto elf = std::move(elf_or).value();
if (!entry.is_executable ||
entry.inode == 0 || // Only parse file-backed entries
entry.path.empty() ||
absl::EndsWith(entry.path, " (deleted)") // Skip deleted files
) {
continue;
}
for (const auto& symbol : elf.symbols()) {
if (elf.position_independent()) {
if (symbol.address < entry.end - entry.start) {
addr_to_symbol[symbol.address + entry.start] = symbol.name;
}
} else {
if (symbol.address >= entry.start && symbol.address < entry.end) {
addr_to_symbol[symbol.address] = symbol.name;
}
auto elf = ElfFile::ParseFromFile(entry.path, ElfFile::kLoadSymbols);
if (!elf.ok()) {
SAPI_RAW_LOG(WARNING, "Could not load symbols for %s: %s", entry.path,
elf.status().message());
continue;
}
for (const auto& symbol : elf->symbols()) {
if (elf->position_independent()) {
if (symbol.address < entry.end - entry.start) {
addr_to_symbol[symbol.address + entry.start] = symbol.name;
}
} else {
if (symbol.address >= entry.start && symbol.address < entry.end) {
addr_to_symbol[symbol.address] = symbol.name;
}
}
}
@ -213,7 +216,7 @@ std::vector<std::string> RunLibUnwindAndSymbolizer(pid_t pid,
std::vector<std::string> stack_trace;
stack_trace.reserve(ips->size());
// Symbolize stacktrace.
// Symbolize stacktrace
for (const auto& ip : *ips) {
const std::string symbol =
GetSymbolAt(addr_to_symbol, static_cast<uint64_t>(ip));