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c3351d4b9f
Instead of getting credentials from Process::current(), we now require that they be provided as input to the various VFS functions. This ensures that an atomic set of credentials is used throughout an entire VFS operation.
61 lines
2 KiB
C++
61 lines
2 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/RefPtr.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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ErrorOr<FlatPtr> Process::sys$chdir(Userspace<char const*> user_path, size_t path_length)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::rpath));
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auto path = TRY(get_syscall_path_argument(user_path, path_length));
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auto current_directory = m_current_directory.with([](auto& current_directory) -> NonnullRefPtr<Custody> {
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return *current_directory;
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});
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RefPtr<Custody> new_directory = TRY(VirtualFileSystem::the().open_directory(credentials(), path->view(), *current_directory));
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m_current_directory.with([&](auto& current_directory) {
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// NOTE: We use swap() here to avoid manipulating the ref counts while holding the lock.
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swap(current_directory, new_directory);
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});
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$fchdir(int fd)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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auto description = TRY(open_file_description(fd));
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if (!description->is_directory())
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return ENOTDIR;
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if (!description->metadata().may_execute(credentials()))
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return EACCES;
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m_current_directory.with([&](auto& current_directory) {
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current_directory = description->custody();
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});
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return 0;
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}
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ErrorOr<FlatPtr> Process::sys$getcwd(Userspace<char*> buffer, size_t size)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::rpath));
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if (size > NumericLimits<ssize_t>::max())
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return EINVAL;
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auto path = TRY(current_directory()->try_serialize_absolute_path());
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size_t ideal_size = path->length() + 1;
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auto size_to_copy = min(ideal_size, size);
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TRY(copy_to_user(buffer, path->characters(), size_to_copy));
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// Note: we return the whole size here, not the copied size.
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return ideal_size;
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}
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}
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