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9201a06027
Before we start disabling acquisition of the big process lock for specific syscalls, make sure to document and assert that all the lock is held during all syscalls.
39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
/*
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* Copyright (c) 2018-2020, 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 <AK/StringView.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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KResultOr<FlatPtr> Process::sys$chroot(Userspace<const char*> user_path, size_t path_length, int mount_flags)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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if (!is_superuser())
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return EPERM;
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REQUIRE_PROMISE(chroot);
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auto path = get_syscall_path_argument(user_path, path_length);
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if (path.is_error())
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return path.error();
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auto directory_or_error = VirtualFileSystem::the().open_directory(path.value()->view(), current_directory());
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if (directory_or_error.is_error())
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return directory_or_error.error();
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auto directory = directory_or_error.value();
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m_root_directory_relative_to_global_root = directory;
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int chroot_mount_flags = mount_flags == -1 ? directory->mount_flags() : mount_flags;
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auto custody_or_error = Custody::try_create(nullptr, "", directory->inode(), chroot_mount_flags);
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if (custody_or_error.is_error())
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return custody_or_error.error();
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set_root_directory(custody_or_error.release_value());
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return 0;
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}
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}
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