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Kernel: Mask kernel addresses in backtraces and profiles

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Addresses outside the userspace virtual range will now show up as
0xdeadc0de in backtraces and profiles generated by unprivileged users.
This commit is contained in:
Andreas Kling 2020-01-02 20:49:21 +01:00
parent 8eb20bdfa2
commit 32ec1e5aed
4 changed files with 24 additions and 14 deletions
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22
Kernel/Thread.cpp
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@ -714,21 +714,27 @@ String Thread::backtrace_impl() const
recognized_symbols.append({ retaddr, ksymbolicate(retaddr) });
}
bool mask_kernel_addresses = !current->process().is_superuser();
for (auto& symbol : recognized_symbols) {
if (!symbol.address)
break;
if (!symbol.ksym) {
if (!Scheduler::is_active() && process.elf_loader() && process.elf_loader()->has_symbols())
builder.appendf("%p %s\n", symbol.address, process.elf_loader()->symbolicate(symbol.address).characters());
else
builder.appendf("%p\n", symbol.address);
if (!is_user_address(VirtualAddress(symbol.address))) {
builder.append("0xdeadc0de\n");
} else {
if (!Scheduler::is_active() && process.elf_loader() && process.elf_loader()->has_symbols())
builder.appendf("%p %s\n", symbol.address, process.elf_loader()->symbolicate(symbol.address).characters());
else
builder.appendf("%p\n", symbol.address);
}
continue;
}
unsigned offset = symbol.address - symbol.ksym->address;
if (symbol.ksym->address == ksym_highest_address && offset > 4096)
builder.appendf("%p\n", symbol.address);
else
builder.appendf("%p %s +%u\n", symbol.address, demangle(symbol.ksym->name).characters(), offset);
if (symbol.ksym->address == ksym_highest_address && offset > 4096) {
builder.appendf("%p\n", mask_kernel_addresses ? 0xdeadc0de : symbol.address);
} else {
builder.appendf("%p %s +%u\n", mask_kernel_addresses ? 0xdeadc0de : symbol.address, demangle(symbol.ksym->name).characters(), offset);
}
}
return builder.to_string();
}