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cf16b2c8e6
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.
31 lines
1 KiB
C++
31 lines
1 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Memory/Region.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$get_stack_bounds(Userspace<FlatPtr*> user_stack_base, Userspace<size_t*> user_stack_size)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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auto& regs = Thread::current()->get_register_dump_from_stack();
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FlatPtr stack_pointer = regs.userspace_sp();
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return address_space().with([&](auto& space) -> ErrorOr<FlatPtr> {
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auto* stack_region = space->find_region_containing(Memory::VirtualRange { VirtualAddress(stack_pointer), 1 });
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// The syscall handler should have killed us if we had an invalid stack pointer.
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VERIFY(stack_region);
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FlatPtr stack_base = stack_region->range().base().get();
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size_t stack_size = stack_region->size();
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TRY(copy_to_user(user_stack_base, &stack_base));
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TRY(copy_to_user(user_stack_size, &stack_size));
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return 0;
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});
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}
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}
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