mirror of
https://github.com/SerenityOS/serenity
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84 lines
2.6 KiB
C++
84 lines
2.6 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/Debug.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/Library/KLexicalPath.h>
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#include <Kernel/Net/LocalSocket.h>
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#include <Kernel/Tasks/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::open_impl(Userspace<Syscall::SC_open_params const*> user_params)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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auto params = TRY(copy_typed_from_user(user_params));
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int dirfd = params.dirfd;
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int options = params.options;
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u16 mode = params.mode;
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if (options & O_NOFOLLOW_NOERROR)
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return EINVAL;
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if (options & O_UNLINK_INTERNAL)
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return EINVAL;
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auto path = TRY(get_syscall_path_argument(params.path));
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// Disable checking open pledges when building userspace with coverage
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// so that all processes can write out coverage data even with pledges
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bool skip_pledge_verification = false;
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#ifdef SKIP_PATH_VALIDATION_FOR_COVERAGE_INSTRUMENTATION
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if (KLexicalPath::basename(path->view()).ends_with(".profraw"sv))
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skip_pledge_verification = true;
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#endif
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if (!skip_pledge_verification) {
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if (options & O_WRONLY)
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TRY(require_promise(Pledge::wpath));
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else if (options & O_RDONLY)
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TRY(require_promise(Pledge::rpath));
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if (options & O_CREAT)
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TRY(require_promise(Pledge::cpath));
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}
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// Ignore everything except permission bits.
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mode &= 0777;
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dbgln_if(IO_DEBUG, "sys$open(dirfd={}, path='{}', options={}, mode={})", dirfd, path->view(), options, mode);
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auto fd_allocation = TRY(allocate_fd());
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auto base = TRY(custody_for_dirfd(dirfd));
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auto description = TRY(VirtualFileSystem::the().open(credentials(), path->view(), options, mode & ~umask(), *base));
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if (description->inode() && description->inode()->bound_socket())
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return ENXIO;
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return m_fds.with_exclusive([&](auto& fds) -> ErrorOr<FlatPtr> {
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u32 fd_flags = (options & O_CLOEXEC) ? FD_CLOEXEC : 0;
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fds[fd_allocation.fd].set(move(description), fd_flags);
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return fd_allocation.fd;
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});
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}
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ErrorOr<FlatPtr> Process::close_impl(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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auto result = description->close();
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m_fds.with_exclusive([fd](auto& fds) { fds[fd] = {}; });
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if (result.is_error())
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return result.release_error();
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return 0;
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}
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}
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