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Kernel: Unbreak ASLR in the new RegionTree world

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Functions that allocate and/or place a Region now take a parameter
that tells it whether to randomize unspecified addresses.
This commit is contained in:
Andreas Kling 2022-04-03 18:46:27 +02:00
parent e89c9ed2ca
commit 858b196c59
9 changed files with 33 additions and 27 deletions
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2
Kernel/Syscalls/clock.cpp
View file

@ -17,7 +17,7 @@ ErrorOr<FlatPtr> Process::sys$map_time_page()
auto& vmobject = TimeManagement::the().time_page_vmobject();
auto* region = TRY(address_space().allocate_region_with_vmobject({}, PAGE_SIZE, PAGE_SIZE, vmobject, 0, "Kernel time page"sv, PROT_READ, true));
auto* region = TRY(address_space().allocate_region_with_vmobject(Memory::RandomizeVirtualAddress::Yes, {}, PAGE_SIZE, PAGE_SIZE, vmobject, 0, "Kernel time page"sv, PROT_READ, true));
return region->vaddr().get();
}

10
Kernel/Syscalls/execve.cpp
View file

@ -295,7 +295,7 @@ static ErrorOr<LoadResult> load_elf_object(NonnullOwnPtr<Memory::AddressSpace> n
}
auto region_name = TRY(KString::formatted("{} (master-tls)", elf_name));
master_tls_region = TRY(new_space->allocate_region({}, program_header.size_in_memory(), PAGE_SIZE, region_name->view(), PROT_READ | PROT_WRITE, AllocationStrategy::Reserve));
master_tls_region = TRY(new_space->allocate_region(Memory::RandomizeVirtualAddress::No, {}, program_header.size_in_memory(), PAGE_SIZE, region_name->view(), PROT_READ | PROT_WRITE, AllocationStrategy::Reserve));
master_tls_size = program_header.size_in_memory();
master_tls_alignment = program_header.alignment();
@ -323,7 +323,7 @@ static ErrorOr<LoadResult> load_elf_object(NonnullOwnPtr<Memory::AddressSpace> n
size_t rounded_range_end = TRY(Memory::page_round_up(program_header.vaddr().offset(load_offset).offset(program_header.size_in_memory()).get()));
auto range_end = VirtualAddress { rounded_range_end };
auto region = TRY(new_space->allocate_region(range_base, range_end.get() - range_base.get(), PAGE_SIZE, region_name->view(), prot, AllocationStrategy::Reserve));
auto region = TRY(new_space->allocate_region(Memory::RandomizeVirtualAddress::No, range_base, range_end.get() - range_base.get(), PAGE_SIZE, region_name->view(), prot, AllocationStrategy::Reserve));
// It's not always the case with PIE executables (and very well shouldn't be) that the
// virtual address in the program header matches the one we end up giving the process.
@ -358,7 +358,7 @@ static ErrorOr<LoadResult> load_elf_object(NonnullOwnPtr<Memory::AddressSpace> n
auto range_base = VirtualAddress { Memory::page_round_down(program_header.vaddr().offset(load_offset).get()) };
size_t rounded_range_end = TRY(Memory::page_round_up(program_header.vaddr().offset(load_offset).offset(program_header.size_in_memory()).get()));
auto range_end = VirtualAddress { rounded_range_end };
auto region = TRY(new_space->allocate_region_with_vmobject(range_base, range_end.get() - range_base.get(), program_header.alignment(), *vmobject, program_header.offset(), elf_name->view(), prot, true));
auto region = TRY(new_space->allocate_region_with_vmobject(Memory::RandomizeVirtualAddress::No, range_base, range_end.get() - range_base.get(), program_header.alignment(), *vmobject, program_header.offset(), elf_name->view(), prot, true));
if (should_allow_syscalls == ShouldAllowSyscalls::Yes)
region->set_syscall_region(true);
@ -392,7 +392,7 @@ static ErrorOr<LoadResult> load_elf_object(NonnullOwnPtr<Memory::AddressSpace> n
return ENOEXEC;
}
auto* stack_region = TRY(new_space->allocate_region({}, Thread::default_userspace_stack_size, PAGE_SIZE, "Stack (Main thread)", PROT_READ | PROT_WRITE, AllocationStrategy::Reserve));
auto* stack_region = TRY(new_space->allocate_region(Memory::RandomizeVirtualAddress::No, {}, Thread::default_userspace_stack_size, PAGE_SIZE, "Stack (Main thread)", PROT_READ | PROT_WRITE, AllocationStrategy::Reserve));
stack_region->set_stack(true);
return LoadResult {
@ -469,7 +469,7 @@ ErrorOr<void> Process::do_exec(NonnullRefPtr<OpenFileDescription> main_program_d
bool has_interpreter = interpreter_description;
interpreter_description = nullptr;
auto* signal_trampoline_region = TRY(load_result.space->allocate_region_with_vmobject({}, PAGE_SIZE, PAGE_SIZE, g_signal_trampoline_region->vmobject(), 0, "Signal trampoline", PROT_READ | PROT_EXEC, true));
auto* signal_trampoline_region = TRY(load_result.space->allocate_region_with_vmobject(Memory::RandomizeVirtualAddress::No, {}, PAGE_SIZE, PAGE_SIZE, g_signal_trampoline_region->vmobject(), 0, "Signal trampoline", PROT_READ | PROT_EXEC, true));
signal_trampoline_region->set_syscall_region(true);
// (For dynamically linked executable) Allocate an FD for passing the main executable to the dynamic loader.

4
Kernel/Syscalls/mmap.cpp
View file

@ -210,7 +210,7 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<Syscall::SC_mmap_params const*> use
vmobject = TRY(Memory::AnonymousVMObject::try_create_with_size(rounded_size, strategy));
}
region = TRY(address_space().allocate_region_with_vmobject(requested_range.base(), requested_range.size(), alignment, vmobject.release_nonnull(), 0, {}, prot, map_shared));
region = TRY(address_space().allocate_region_with_vmobject(map_randomized ? Memory::RandomizeVirtualAddress::Yes : Memory::RandomizeVirtualAddress::No, requested_range.base(), requested_range.size(), alignment, vmobject.release_nonnull(), 0, {}, prot, map_shared));
} else {
if (offset < 0)
return EINVAL;
@ -507,7 +507,7 @@ ErrorOr<FlatPtr> Process::sys$allocate_tls(Userspace<char const*> initial_data,
if (multiple_threads)
return EINVAL;
auto* region = TRY(address_space().allocate_region({}, size, PAGE_SIZE, "Master TLS"sv, PROT_READ | PROT_WRITE));
auto* region = TRY(address_space().allocate_region(Memory::RandomizeVirtualAddress::Yes, {}, size, PAGE_SIZE, "Master TLS"sv, PROT_READ | PROT_WRITE));
m_master_tls_region = TRY(region->try_make_weak_ptr());
m_master_tls_size = size;