mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-13 11:42:38 +03:00
efeb01e35f
This syscall only reads from the shared m_space field, but that field is only over written to by Process::attach_resources, before the process was initialized (aka, before syscalls can happen), by Process::finalize which is only called after all the process' threads have exited (aka, syscalls can not happen anymore), and by Process::do_exec which calls all other syscall-capable threads before doing so. Space's find_region_containing already holds its own lock, and as such there's no need to hold the big lock.
32 lines
994 B
C++
32 lines
994 B
C++
/*
|
|
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <Kernel/Memory/Region.h>
|
|
#include <Kernel/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
KResultOr<FlatPtr> Process::sys$get_stack_bounds(Userspace<FlatPtr*> user_stack_base, Userspace<size_t*> user_stack_size)
|
|
{
|
|
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
|
auto& regs = Thread::current()->get_register_dump_from_stack();
|
|
FlatPtr stack_pointer = regs.userspace_sp();
|
|
auto* stack_region = address_space().find_region_containing(Memory::VirtualRange { VirtualAddress(stack_pointer), 1 });
|
|
|
|
// The syscall handler should have killed us if we had an invalid stack pointer.
|
|
VERIFY(stack_region);
|
|
|
|
FlatPtr stack_base = stack_region->range().base().get();
|
|
size_t stack_size = stack_region->size();
|
|
if (!copy_to_user(user_stack_base, &stack_base))
|
|
return EFAULT;
|
|
if (!copy_to_user(user_stack_size, &stack_size))
|
|
return EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
}
|