mirror of
https://github.com/RGBCube/serenity
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bad6d50b86
This change lays the foundation for making the require_promise return an error hand handling the process abort outside of the syscall implementations, to avoid cases where we would leak resources. It also has the advantage that it makes removes a gs pointer read to look up the current thread, then process for every syscall. We can instead go through the Process this pointer in most cases.
79 lines
2.2 KiB
C++
79 lines
2.2 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 <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/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$open(Userspace<const Syscall::SC_open_params*> user_params)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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auto params = TRY(copy_typed_from_user(user_params));
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int dirfd = params.dirfd;
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int options = params.options;
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u16 mode = params.mode;
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if (options & O_NOFOLLOW_NOERROR)
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return EINVAL;
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if (options & O_UNLINK_INTERNAL)
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return EINVAL;
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if (options & O_WRONLY)
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require_promise(Pledge::wpath);
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else if (options & O_RDONLY)
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require_promise(Pledge::rpath);
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if (options & O_CREAT)
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require_promise(Pledge::cpath);
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// Ignore everything except permission bits.
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mode &= 0777;
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auto path = TRY(get_syscall_path_argument(params.path));
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dbgln_if(IO_DEBUG, "sys$open(dirfd={}, path='{}', options={}, mode={})", dirfd, path->view(), options, mode);
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auto fd_allocation = TRY(m_fds.allocate());
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RefPtr<Custody> base;
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if (dirfd == AT_FDCWD) {
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base = current_directory();
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} else {
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auto base_description = TRY(fds().open_file_description(dirfd));
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if (!base_description->is_directory())
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return ENOTDIR;
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if (!base_description->custody())
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return EINVAL;
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base = base_description->custody();
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}
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auto description = TRY(VirtualFileSystem::the().open(path->view(), options, mode & ~umask(), *base));
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if (description->inode() && description->inode()->socket())
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return ENXIO;
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u32 fd_flags = (options & O_CLOEXEC) ? FD_CLOEXEC : 0;
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m_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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ErrorOr<FlatPtr> Process::sys$close(int fd)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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require_promise(Pledge::stdio);
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auto description = TRY(fds().open_file_description(fd));
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auto result = description->close();
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m_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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