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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.
64 lines
1.9 KiB
C++
64 lines
1.9 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/NonnullRefPtrVector.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/FileDescription.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$fstat(int fd, Userspace<stat*> user_statbuf)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(stdio);
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auto description = fds().file_description(fd);
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if (!description)
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return EBADF;
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stat buffer = {};
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int rc = description->stat(buffer);
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if (!copy_to_user(user_statbuf, &buffer))
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return EFAULT;
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return rc;
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}
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KResultOr<FlatPtr> Process::sys$stat(Userspace<const Syscall::SC_stat_params*> user_params)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
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REQUIRE_PROMISE(rpath);
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Syscall::SC_stat_params params;
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if (!copy_from_user(¶ms, user_params))
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return EFAULT;
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auto path = get_syscall_path_argument(params.path);
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if (path.is_error())
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return path.error();
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RefPtr<Custody> base;
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if (params.dirfd == AT_FDCWD) {
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base = current_directory();
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} else {
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auto base_description = fds().file_description(params.dirfd);
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if (!base_description)
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return EBADF;
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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 metadata_or_error = VirtualFileSystem::the().lookup_metadata(path.value()->view(), *base, params.follow_symlinks ? 0 : O_NOFOLLOW_NOERROR);
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if (metadata_or_error.is_error())
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return metadata_or_error.error();
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stat statbuf;
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auto result = metadata_or_error.value().stat(statbuf);
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if (result.is_error())
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return result;
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if (!copy_to_user(params.statbuf, &statbuf))
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return EFAULT;
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return 0;
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}
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}
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