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Kernel: Wrap process address spaces in SpinlockProtected

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This forces anyone who wants to look into and/or manipulate an address
space to lock it. And this replaces the previous, more flimsy, manual
spinlock use.

Note that pointers *into* the address space are not safe to use after
you unlock the space. We've got many issues like this, and we'll have
to track those down as wlel.
This commit is contained in:
Andreas Kling 2022-08-23 17:58:05 +02:00
parent d6ef18f587
commit cf16b2c8e6
38 changed files with 708 additions and 627 deletions
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34
Kernel/Syscalls/fork.cpp
View file

@ -65,7 +65,6 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
});
dbgln_if(FORK_DEBUG, "fork: child={}", child);
child->address_space().set_enforces_syscall_regions(address_space().enforces_syscall_regions());
// A child created via fork(2) inherits a copy of its parent's signal mask
child_first_thread->update_signal_mask(Thread::current()->signal_mask());
@ -123,23 +122,26 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
# error Unknown architecture
#endif
{
TRY(address_space().region_tree().with([&](auto& parent_region_tree) -> ErrorOr<void> {
return child->address_space().region_tree().with([&](auto& child_region_tree) -> ErrorOr<void> {
for (auto& region : parent_region_tree.regions()) {
dbgln_if(FORK_DEBUG, "fork: cloning Region '{}' @ {}", region.name(), region.vaddr());
auto region_clone = TRY(region.try_clone());
TRY(region_clone->map(child->address_space().page_directory(), Memory::ShouldFlushTLB::No));
TRY(child_region_tree.place_specifically(*region_clone, region.range()));
auto* child_region = region_clone.leak_ptr();
TRY(address_space().with([&](auto& parent_space) {
return child->address_space().with([&](auto& child_space) {
child_space->set_enforces_syscall_regions(parent_space->enforces_syscall_regions());
return parent_space->region_tree().with([&](auto& parent_region_tree) -> ErrorOr<void> {
return child_space->region_tree().with([&](auto& child_region_tree) -> ErrorOr<void> {
for (auto& region : parent_region_tree.regions()) {
dbgln_if(FORK_DEBUG, "fork: cloning Region '{}' @ {}", region.name(), region.vaddr());
auto region_clone = TRY(region.try_clone());
TRY(region_clone->map(child_space->page_directory(), Memory::ShouldFlushTLB::No));
TRY(child_region_tree.place_specifically(*region_clone, region.range()));
auto* child_region = region_clone.leak_ptr();
if (&region == m_master_tls_region.unsafe_ptr())
child->m_master_tls_region = TRY(child_region->try_make_weak_ptr());
}
return {};
if (&region == m_master_tls_region.unsafe_ptr())
child->m_master_tls_region = TRY(child_region->try_make_weak_ptr());
}
return {};
});
});
}));
}
});
}));
thread_finalizer_guard.disarm();