mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-19 16:01:40 +00:00
d951e2ca97
This exposes the child processes for a process as a directory of symlinks to the respective /proc entries for each child. This makes for an easier and possibly more efficient way to find and count a process's children. Previously the only method was to parse the entire /proc/all JSON file.
607 lines
23 KiB
C++
607 lines
23 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Spencer Dixon <spencercdixon@gmail.com>
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Singleton.h>
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#include <Kernel/API/POSIX/errno.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/OpenFileDescription.h>
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#include <Kernel/FileSystem/ProcFS.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Heap/kmalloc.h>
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#include <Kernel/Process.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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static Singleton<ProcFSComponentRegistry> s_the;
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ProcFSComponentRegistry& ProcFSComponentRegistry::the()
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{
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return *s_the;
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}
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UNMAP_AFTER_INIT void ProcFSComponentRegistry::initialize()
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{
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VERIFY(!s_the.is_initialized());
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s_the.ensure_instance();
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}
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UNMAP_AFTER_INIT ProcFSComponentRegistry::ProcFSComponentRegistry()
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: m_root_directory(ProcFSRootDirectory::must_create())
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{
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}
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ErrorOr<NonnullRefPtr<ProcFS>> ProcFS::try_create()
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFS());
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}
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ProcFS::ProcFS() = default;
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ProcFS::~ProcFS() = default;
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ErrorOr<void> ProcFS::initialize()
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{
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m_root_inode = static_ptr_cast<ProcFSDirectoryInode>(TRY(ProcFSComponentRegistry::the().root_directory().to_inode(*this)));
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return {};
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}
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Inode& ProcFS::root_inode()
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{
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return *m_root_inode;
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}
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ProcFSInode::ProcFSInode(ProcFS const& fs, InodeIndex index)
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: Inode(const_cast<ProcFS&>(fs), index)
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{
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}
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ProcFSInode::~ProcFSInode() = default;
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ErrorOr<void> ProcFSInode::flush_metadata()
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{
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return {};
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}
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ErrorOr<void> ProcFSInode::add_child(Inode&, StringView, mode_t)
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{
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return EROFS;
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}
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ErrorOr<NonnullRefPtr<Inode>> ProcFSInode::create_child(StringView, mode_t, dev_t, UserID, GroupID)
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{
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return EROFS;
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}
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ErrorOr<void> ProcFSInode::remove_child(StringView)
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{
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return EROFS;
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}
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ErrorOr<void> ProcFSInode::chmod(mode_t)
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{
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return EPERM;
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}
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ErrorOr<void> ProcFSInode::chown(UserID, GroupID)
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{
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return EPERM;
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}
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ErrorOr<NonnullRefPtr<ProcFSGlobalInode>> ProcFSGlobalInode::try_create(ProcFS const& fs, ProcFSExposedComponent const& component)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSGlobalInode(fs, component));
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}
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ProcFSGlobalInode::ProcFSGlobalInode(ProcFS const& fs, ProcFSExposedComponent const& component)
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: ProcFSInode(fs, component.component_index())
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, m_associated_component(component)
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{
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}
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void ProcFSGlobalInode::did_seek(OpenFileDescription& description, off_t new_offset)
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{
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if (new_offset != 0)
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return;
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auto result = m_associated_component->refresh_data(description);
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if (result.is_error()) {
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// Subsequent calls to read will return EIO!
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dbgln("ProcFS: Could not refresh contents: {}", result.error());
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}
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}
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ErrorOr<void> ProcFSGlobalInode::attach(OpenFileDescription& description)
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{
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return m_associated_component->refresh_data(description);
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}
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ErrorOr<size_t> ProcFSGlobalInode::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription* fd) const
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{
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return m_associated_component->read_bytes(offset, count, buffer, fd);
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}
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StringView ProcFSGlobalInode::name() const
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{
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return m_associated_component->name();
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}
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ErrorOr<void> ProcFSGlobalInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const
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{
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VERIFY_NOT_REACHED();
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}
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ErrorOr<NonnullRefPtr<Inode>> ProcFSGlobalInode::lookup(StringView)
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{
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VERIFY_NOT_REACHED();
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}
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ErrorOr<void> ProcFSGlobalInode::truncate(u64 size)
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{
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return m_associated_component->truncate(size);
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}
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ErrorOr<void> ProcFSGlobalInode::set_mtime(time_t time)
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{
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return m_associated_component->set_mtime(time);
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}
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InodeMetadata ProcFSGlobalInode::metadata() const
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{
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MutexLocker locker(m_inode_lock);
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InodeMetadata metadata;
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metadata.inode = { fsid(), m_associated_component->component_index() };
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metadata.mode = S_IFREG | m_associated_component->required_mode();
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metadata.uid = m_associated_component->owner_user();
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metadata.gid = m_associated_component->owner_group();
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metadata.size = 0;
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metadata.mtime = m_associated_component->modified_time();
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return metadata;
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}
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ErrorOr<size_t> ProcFSGlobalInode::write_bytes(off_t offset, size_t count, UserOrKernelBuffer const& buffer, OpenFileDescription* fd)
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{
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return m_associated_component->write_bytes(offset, count, buffer, fd);
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}
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ErrorOr<NonnullRefPtr<ProcFSDirectoryInode>> ProcFSDirectoryInode::try_create(ProcFS const& procfs, ProcFSExposedComponent const& component)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSDirectoryInode(procfs, component));
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}
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ProcFSDirectoryInode::ProcFSDirectoryInode(ProcFS const& fs, ProcFSExposedComponent const& component)
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: ProcFSGlobalInode(fs, component)
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{
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}
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ProcFSDirectoryInode::~ProcFSDirectoryInode() = default;
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InodeMetadata ProcFSDirectoryInode::metadata() const
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{
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MutexLocker locker(m_inode_lock);
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InodeMetadata metadata;
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metadata.inode = { fsid(), m_associated_component->component_index() };
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metadata.mode = S_IFDIR | m_associated_component->required_mode();
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metadata.uid = m_associated_component->owner_user();
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metadata.gid = m_associated_component->owner_group();
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metadata.size = 0;
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metadata.mtime = m_associated_component->modified_time();
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return metadata;
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}
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ErrorOr<void> ProcFSDirectoryInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
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{
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MutexLocker locker(procfs().m_lock);
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return m_associated_component->traverse_as_directory(procfs().fsid(), move(callback));
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}
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ErrorOr<NonnullRefPtr<Inode>> ProcFSDirectoryInode::lookup(StringView name)
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{
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MutexLocker locker(procfs().m_lock);
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auto component = TRY(m_associated_component->lookup(name));
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return component->to_inode(procfs());
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}
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ErrorOr<NonnullRefPtr<ProcFSLinkInode>> ProcFSLinkInode::try_create(ProcFS const& procfs, ProcFSExposedComponent const& component)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSLinkInode(procfs, component));
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}
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ProcFSLinkInode::ProcFSLinkInode(ProcFS const& fs, ProcFSExposedComponent const& component)
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: ProcFSGlobalInode(fs, component)
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{
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}
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InodeMetadata ProcFSLinkInode::metadata() const
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{
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MutexLocker locker(m_inode_lock);
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InodeMetadata metadata;
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metadata.inode = { fsid(), m_associated_component->component_index() };
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metadata.mode = S_IFLNK | m_associated_component->required_mode();
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metadata.uid = m_associated_component->owner_user();
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metadata.gid = m_associated_component->owner_group();
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metadata.size = 0;
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metadata.mtime = m_associated_component->modified_time();
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return metadata;
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}
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ProcFSProcessAssociatedInode::ProcFSProcessAssociatedInode(ProcFS const& fs, ProcessID associated_pid, InodeIndex determined_index)
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: ProcFSInode(fs, determined_index)
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, m_pid(associated_pid)
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{
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}
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ErrorOr<size_t> ProcFSProcessAssociatedInode::write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*)
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{
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return ENOTSUP;
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}
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ErrorOr<NonnullRefPtr<ProcFSProcessDirectoryInode>> ProcFSProcessDirectoryInode::try_create(ProcFS const& procfs, ProcessID pid)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessDirectoryInode(procfs, pid));
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}
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ProcFSProcessDirectoryInode::ProcFSProcessDirectoryInode(ProcFS const& procfs, ProcessID pid)
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: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_pid_directory(pid))
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{
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}
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ErrorOr<void> ProcFSProcessDirectoryInode::attach(OpenFileDescription&)
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{
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return {};
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}
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InodeMetadata ProcFSProcessDirectoryInode::metadata() const
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{
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MutexLocker locker(m_inode_lock);
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auto process = Process::from_pid(associated_pid());
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if (!process)
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return {};
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auto traits = process->procfs_traits();
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InodeMetadata metadata;
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metadata.inode = { fsid(), traits->component_index() };
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metadata.mode = S_IFDIR | traits->required_mode();
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metadata.uid = traits->owner_user();
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metadata.gid = traits->owner_group();
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metadata.size = 0;
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metadata.mtime = traits->modified_time();
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return metadata;
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}
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ErrorOr<size_t> ProcFSProcessDirectoryInode::read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const
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{
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VERIFY_NOT_REACHED();
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}
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ErrorOr<void> ProcFSProcessDirectoryInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
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{
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MutexLocker locker(procfs().m_lock);
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auto process = Process::from_pid(associated_pid());
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if (!process)
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return EINVAL;
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return process->procfs_traits()->traverse_as_directory(procfs().fsid(), move(callback));
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}
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ErrorOr<NonnullRefPtr<Inode>> ProcFSProcessDirectoryInode::lookup(StringView name)
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{
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MutexLocker locker(procfs().m_lock);
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auto process = Process::from_pid(associated_pid());
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if (!process)
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return ESRCH;
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if (name == "fd"sv)
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return TRY(ProcFSProcessSubDirectoryInode::try_create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::OpenFileDescriptions, associated_pid()));
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if (name == "stacks"sv)
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return TRY(ProcFSProcessSubDirectoryInode::try_create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::Stacks, associated_pid()));
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if (name == "children"sv)
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return TRY(ProcFSProcessSubDirectoryInode::try_create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::Children, associated_pid()));
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if (name == "unveil"sv)
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return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Unveil, associated_pid()));
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if (name == "pledge"sv)
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return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Pledge, associated_pid()));
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if (name == "fds"sv)
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return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::OpenFileDescriptions, associated_pid()));
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if (name == "exe"sv)
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return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::BinaryLink, associated_pid()));
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if (name == "cwd"sv)
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return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::CurrentWorkDirectoryLink, associated_pid()));
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if (name == "perf_events"sv)
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return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::PerformanceEvents, associated_pid()));
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if (name == "vm"sv)
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return TRY(ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::VirtualMemoryStats, associated_pid()));
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return ENOENT;
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}
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ErrorOr<NonnullRefPtr<ProcFSProcessSubDirectoryInode>> ProcFSProcessSubDirectoryInode::try_create(ProcFS const& procfs, SegmentedProcFSIndex::ProcessSubDirectory sub_directory_type, ProcessID pid)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessSubDirectoryInode(procfs, sub_directory_type, pid));
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}
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ProcFSProcessSubDirectoryInode::ProcFSProcessSubDirectoryInode(ProcFS const& procfs, SegmentedProcFSIndex::ProcessSubDirectory sub_directory_type, ProcessID pid)
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: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_sub_directory(pid, sub_directory_type))
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, m_sub_directory_type(sub_directory_type)
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{
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}
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ErrorOr<size_t> ProcFSProcessSubDirectoryInode::read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const
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{
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VERIFY_NOT_REACHED();
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}
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ErrorOr<void> ProcFSProcessSubDirectoryInode::attach(OpenFileDescription&)
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{
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return {};
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}
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void ProcFSProcessSubDirectoryInode::did_seek(OpenFileDescription&, off_t)
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{
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VERIFY_NOT_REACHED();
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}
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InodeMetadata ProcFSProcessSubDirectoryInode::metadata() const
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{
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MutexLocker locker(m_inode_lock);
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auto process = Process::from_pid(associated_pid());
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if (!process)
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return {};
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auto traits = process->procfs_traits();
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InodeMetadata metadata;
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metadata.inode = { fsid(), traits->component_index() };
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metadata.mode = S_IFDIR | traits->required_mode();
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metadata.uid = traits->owner_user();
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metadata.gid = traits->owner_group();
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metadata.size = 0;
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metadata.mtime = traits->modified_time();
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return metadata;
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}
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ErrorOr<void> ProcFSProcessSubDirectoryInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
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{
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MutexLocker locker(procfs().m_lock);
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auto process = Process::from_pid(associated_pid());
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if (!process)
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return EINVAL;
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switch (m_sub_directory_type) {
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case SegmentedProcFSIndex::ProcessSubDirectory::OpenFileDescriptions:
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return process->traverse_file_descriptions_directory(procfs().fsid(), move(callback));
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case SegmentedProcFSIndex::ProcessSubDirectory::Stacks:
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return process->traverse_stacks_directory(procfs().fsid(), move(callback));
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case SegmentedProcFSIndex::ProcessSubDirectory::Children:
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return process->traverse_children_directory(procfs().fsid(), move(callback));
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default:
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VERIFY_NOT_REACHED();
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}
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VERIFY_NOT_REACHED();
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}
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ErrorOr<NonnullRefPtr<Inode>> ProcFSProcessSubDirectoryInode::lookup(StringView name)
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{
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MutexLocker locker(procfs().m_lock);
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auto process = Process::from_pid(associated_pid());
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if (!process)
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return ESRCH;
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switch (m_sub_directory_type) {
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case SegmentedProcFSIndex::ProcessSubDirectory::OpenFileDescriptions:
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return process->lookup_file_descriptions_directory(procfs(), name);
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case SegmentedProcFSIndex::ProcessSubDirectory::Stacks:
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return process->lookup_stacks_directory(procfs(), name);
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case SegmentedProcFSIndex::ProcessSubDirectory::Children:
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return process->lookup_children_directory(procfs(), name);
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default:
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VERIFY_NOT_REACHED();
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}
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}
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ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::try_create_for_file_description_link(ProcFS const& procfs, unsigned file_description_index, ProcessID pid)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, file_description_index, pid));
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}
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ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::try_create_for_thread_stack(ProcFS const& procfs, ThreadID stack_thread_index, ProcessID pid)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, stack_thread_index, pid));
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}
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ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::try_create_for_pid_property(ProcFS const& procfs, SegmentedProcFSIndex::MainProcessProperty main_property_type, ProcessID pid)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, main_property_type, pid));
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}
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ErrorOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::try_create_for_child_process_link(ProcFS const& procfs, ProcessID child_pid, ProcessID pid)
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{
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return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, child_pid, pid));
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}
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ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(ProcFS const& procfs, SegmentedProcFSIndex::MainProcessProperty main_property_type, ProcessID pid)
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: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(pid, main_property_type))
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, m_parent_sub_directory_type(SegmentedProcFSIndex::ProcessSubDirectory::Reserved)
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{
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m_possible_data.property_type = main_property_type;
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}
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ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(ProcFS const& procfs, unsigned file_description_index, ProcessID pid)
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: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_file_description(pid, file_description_index))
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, m_parent_sub_directory_type(SegmentedProcFSIndex::ProcessSubDirectory::OpenFileDescriptions)
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{
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m_possible_data.property_index = file_description_index;
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}
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ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(ProcFS const& procfs, ThreadID thread_stack_index, ProcessID pid)
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: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_thread_stack(pid, thread_stack_index))
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, m_parent_sub_directory_type(SegmentedProcFSIndex::ProcessSubDirectory::Stacks)
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{
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m_possible_data.property_index = thread_stack_index.value();
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}
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ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(ProcFS const& procfs, ProcessID child_pid, ProcessID pid)
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: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_children(pid, child_pid))
|
|
, m_parent_sub_directory_type(SegmentedProcFSIndex::ProcessSubDirectory::Children)
|
|
{
|
|
m_possible_data.property_index = child_pid.value();
|
|
}
|
|
|
|
ErrorOr<void> ProcFSProcessPropertyInode::attach(OpenFileDescription& description)
|
|
{
|
|
return refresh_data(description);
|
|
}
|
|
void ProcFSProcessPropertyInode::did_seek(OpenFileDescription& description, off_t offset)
|
|
{
|
|
if (offset != 0)
|
|
return;
|
|
(void)refresh_data(description);
|
|
}
|
|
|
|
static mode_t determine_procfs_process_inode_mode(SegmentedProcFSIndex::ProcessSubDirectory parent_sub_directory_type, SegmentedProcFSIndex::MainProcessProperty main_property)
|
|
{
|
|
if (parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::OpenFileDescriptions)
|
|
return S_IFLNK | 0400;
|
|
if (parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Stacks)
|
|
return S_IFREG | 0400;
|
|
if (parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Children)
|
|
return S_IFLNK | 0400;
|
|
VERIFY(parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Reserved);
|
|
if (main_property == SegmentedProcFSIndex::MainProcessProperty::BinaryLink)
|
|
return S_IFLNK | 0777;
|
|
if (main_property == SegmentedProcFSIndex::MainProcessProperty::CurrentWorkDirectoryLink)
|
|
return S_IFLNK | 0777;
|
|
return S_IFREG | 0400;
|
|
}
|
|
|
|
InodeMetadata ProcFSProcessPropertyInode::metadata() const
|
|
{
|
|
MutexLocker locker(m_inode_lock);
|
|
auto process = Process::from_pid(associated_pid());
|
|
if (!process)
|
|
return {};
|
|
|
|
auto traits = process->procfs_traits();
|
|
InodeMetadata metadata;
|
|
metadata.inode = { fsid(), traits->component_index() };
|
|
metadata.mode = determine_procfs_process_inode_mode(m_parent_sub_directory_type, m_possible_data.property_type);
|
|
metadata.uid = traits->owner_user();
|
|
metadata.gid = traits->owner_group();
|
|
metadata.size = 0;
|
|
metadata.mtime = traits->modified_time();
|
|
return metadata;
|
|
}
|
|
ErrorOr<void> ProcFSProcessPropertyInode::traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const
|
|
{
|
|
VERIFY_NOT_REACHED();
|
|
}
|
|
ErrorOr<size_t> ProcFSProcessPropertyInode::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription* description) const
|
|
{
|
|
dbgln_if(PROCFS_DEBUG, "ProcFS ProcessInformation: read_bytes offset: {} count: {}", offset, count);
|
|
|
|
VERIFY(offset >= 0);
|
|
VERIFY(buffer.user_or_kernel_ptr());
|
|
|
|
if (!description) {
|
|
auto builder = TRY(KBufferBuilder::try_create());
|
|
auto process = Process::from_pid(associated_pid());
|
|
if (!process)
|
|
return Error::from_errno(ESRCH);
|
|
TRY(try_to_acquire_data(*process, builder));
|
|
auto data_buffer = builder.build();
|
|
if (!data_buffer)
|
|
return Error::from_errno(EFAULT);
|
|
ssize_t nread = min(static_cast<off_t>(data_buffer->size() - offset), static_cast<off_t>(count));
|
|
TRY(buffer.write(data_buffer->data() + offset, nread));
|
|
return nread;
|
|
}
|
|
if (!description->data()) {
|
|
dbgln("ProcFS Process Information: Do not have cached data!");
|
|
return Error::from_errno(EIO);
|
|
}
|
|
|
|
MutexLocker locker(m_refresh_lock);
|
|
|
|
auto& typed_cached_data = static_cast<ProcFSInodeData&>(*description->data());
|
|
auto& data_buffer = typed_cached_data.buffer;
|
|
|
|
if (!data_buffer || (size_t)offset >= data_buffer->size())
|
|
return 0;
|
|
|
|
ssize_t nread = min(static_cast<off_t>(data_buffer->size() - offset), static_cast<off_t>(count));
|
|
TRY(buffer.write(data_buffer->data() + offset, nread));
|
|
|
|
return nread;
|
|
}
|
|
ErrorOr<NonnullRefPtr<Inode>> ProcFSProcessPropertyInode::lookup(StringView)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
|
|
static ErrorOr<void> build_from_cached_data(KBufferBuilder& builder, ProcFSInodeData& cached_data)
|
|
{
|
|
cached_data.buffer = builder.build();
|
|
if (!cached_data.buffer)
|
|
return ENOMEM;
|
|
return {};
|
|
}
|
|
|
|
ErrorOr<void> ProcFSProcessPropertyInode::try_to_acquire_data(Process& process, KBufferBuilder& builder) const
|
|
{
|
|
// FIXME: Verify process is already ref-counted
|
|
if (m_parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::OpenFileDescriptions) {
|
|
TRY(process.procfs_get_file_description_link(m_possible_data.property_index, builder));
|
|
return {};
|
|
}
|
|
if (m_parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Stacks) {
|
|
TRY(process.procfs_get_thread_stack(m_possible_data.property_index, builder));
|
|
return {};
|
|
}
|
|
if (m_parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Children) {
|
|
TRY(process.procfs_get_child_proccess_link(m_possible_data.property_index, builder));
|
|
return {};
|
|
}
|
|
|
|
VERIFY(m_parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Reserved);
|
|
switch (m_possible_data.property_type) {
|
|
case SegmentedProcFSIndex::MainProcessProperty::Unveil:
|
|
return process.procfs_get_unveil_stats(builder);
|
|
case SegmentedProcFSIndex::MainProcessProperty::Pledge:
|
|
return process.procfs_get_pledge_stats(builder);
|
|
case SegmentedProcFSIndex::MainProcessProperty::OpenFileDescriptions:
|
|
return process.procfs_get_fds_stats(builder);
|
|
case SegmentedProcFSIndex::MainProcessProperty::BinaryLink:
|
|
return process.procfs_get_binary_link(builder);
|
|
case SegmentedProcFSIndex::MainProcessProperty::CurrentWorkDirectoryLink:
|
|
return process.procfs_get_current_work_directory_link(builder);
|
|
case SegmentedProcFSIndex::MainProcessProperty::PerformanceEvents:
|
|
return process.procfs_get_perf_events(builder);
|
|
case SegmentedProcFSIndex::MainProcessProperty::VirtualMemoryStats:
|
|
return process.procfs_get_virtual_memory_stats(builder);
|
|
default:
|
|
VERIFY_NOT_REACHED();
|
|
}
|
|
}
|
|
|
|
ErrorOr<void> ProcFSProcessPropertyInode::refresh_data(OpenFileDescription& description)
|
|
{
|
|
// For process-specific inodes, hold the process's ptrace lock across refresh
|
|
// and refuse to load data if the process is not dumpable.
|
|
// Without this, files opened before a process went non-dumpable could still be used for dumping.
|
|
auto process = Process::from_pid(associated_pid());
|
|
if (!process)
|
|
return Error::from_errno(ESRCH);
|
|
process->ptrace_lock().lock();
|
|
if (!process->is_dumpable()) {
|
|
process->ptrace_lock().unlock();
|
|
return EPERM;
|
|
}
|
|
ScopeGuard guard = [&] {
|
|
process->ptrace_lock().unlock();
|
|
};
|
|
MutexLocker locker(m_refresh_lock);
|
|
auto& cached_data = description.data();
|
|
if (!cached_data) {
|
|
cached_data = adopt_own_if_nonnull(new (nothrow) ProcFSInodeData);
|
|
if (!cached_data)
|
|
return ENOMEM;
|
|
}
|
|
auto builder = TRY(KBufferBuilder::try_create());
|
|
TRY(try_to_acquire_data(*process, builder));
|
|
return build_from_cached_data(builder, static_cast<ProcFSInodeData&>(*cached_data));
|
|
}
|
|
}
|