mirror of
https://github.com/RGBCube/serenity
synced 2025-07-25 03:57:43 +00:00
Kernel: Steer away from heap allocations for ProcFS process data
Instead, use more static patterns to acquire that sort of data.
This commit is contained in:
Liav A
Andreas Kling
parent
bf1adc2d5d
commit
7ba991dc37
11 changed files with 991 additions and 879 deletions
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@ -13,6 +13,7 @@
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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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#include <LibC/errno_numbers.h>
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@ -36,25 +37,16 @@ UNMAP_AFTER_INIT ProcFSComponentRegistry::ProcFSComponentRegistry()
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{
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}
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void ProcFSComponentRegistry::register_new_process(Process& new_process)
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{
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MutexLocker locker(m_lock);
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m_root_directory->m_process_directories.append(ProcFSProcessDirectory::create(new_process));
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}
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void ProcFSComponentRegistry::unregister_process(Process& deleted_process)
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{
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auto process_directory = m_root_directory->process_directory_for(deleted_process).release_nonnull();
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process_directory->prepare_for_deletion();
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process_directory->m_list_node.remove();
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dbgln_if(PROCFS_DEBUG, "ProcFSExposedDirectory ref_count now: {}", process_directory->ref_count());
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}
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RefPtr<ProcFS> ProcFS::create()
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{
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return adopt_ref_if_nonnull(new (nothrow) ProcFS);
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}
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ProcFS::ProcFS()
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: m_root_inode(ProcFSComponentRegistry::the().root_directory().to_inode(*this))
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{
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}
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ProcFS::~ProcFS()
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{
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}
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@ -69,90 +61,25 @@ Inode& ProcFS::root_inode()
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return *m_root_inode;
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}
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NonnullRefPtr<ProcFSInode> ProcFSInode::create(const ProcFS& fs, const ProcFSExposedComponent& component)
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ProcFSInode::ProcFSInode(const ProcFS& fs, InodeIndex index)
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: Inode(const_cast<ProcFS&>(fs), index)
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{
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return adopt_ref(*new (nothrow) ProcFSInode(fs, component));
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}
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ProcFSInode::ProcFSInode(const ProcFS& fs, const ProcFSExposedComponent& component)
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: Inode(const_cast<ProcFS&>(fs), component.component_index())
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, m_associated_component(component)
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{
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}
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KResult ProcFSInode::attach(FileDescription& description)
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{
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return m_associated_component->refresh_data(description);
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}
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void ProcFSInode::did_seek(FileDescription& 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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ProcFSInode::~ProcFSInode()
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{
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}
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ProcFS::ProcFS()
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: m_root_inode(ProcFSComponentRegistry::the().root_directory().to_inode(*this))
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{
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}
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KResultOr<size_t> ProcFSInode::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, FileDescription* 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 ProcFSInode::name() const
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{
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return m_associated_component->name();
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}
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KResult ProcFSInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const
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{
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VERIFY_NOT_REACHED();
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}
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RefPtr<Inode> ProcFSInode::lookup(StringView)
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{
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VERIFY_NOT_REACHED();
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}
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InodeMetadata ProcFSInode::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 = m_associated_component->size();
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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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void ProcFSInode::flush_metadata()
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{
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}
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KResultOr<size_t> ProcFSInode::write_bytes(off_t offset, size_t count, const UserOrKernelBuffer& buffer, FileDescription* 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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KResultOr<NonnullRefPtr<Inode>> ProcFSInode::create_child(StringView, mode_t, dev_t, uid_t, gid_t)
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KResult ProcFSInode::add_child(Inode&, const StringView&, mode_t)
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{
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return EROFS;
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}
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KResult ProcFSInode::add_child(Inode&, const StringView&, mode_t)
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KResultOr<NonnullRefPtr<Inode>> ProcFSInode::create_child(StringView, mode_t, dev_t, uid_t, gid_t)
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{
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return EROFS;
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}
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@ -177,13 +104,78 @@ KResult ProcFSInode::truncate(u64)
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return EPERM;
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}
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NonnullRefPtr<ProcFSGlobalInode> ProcFSGlobalInode::create(const ProcFS& fs, const ProcFSExposedComponent& component)
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{
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return adopt_ref(*new (nothrow) ProcFSGlobalInode(fs, component));
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}
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ProcFSGlobalInode::ProcFSGlobalInode(const ProcFS& fs, const ProcFSExposedComponent& 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(FileDescription& 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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KResult ProcFSGlobalInode::attach(FileDescription& description)
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{
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return m_associated_component->refresh_data(description);
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}
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KResultOr<size_t> ProcFSGlobalInode::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, FileDescription* 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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KResult ProcFSGlobalInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const
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{
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VERIFY_NOT_REACHED();
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}
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RefPtr<Inode> ProcFSGlobalInode::lookup(StringView)
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{
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VERIFY_NOT_REACHED();
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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 = m_associated_component->size();
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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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KResultOr<size_t> ProcFSGlobalInode::write_bytes(off_t offset, size_t count, const UserOrKernelBuffer& buffer, FileDescription* 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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NonnullRefPtr<ProcFSDirectoryInode> ProcFSDirectoryInode::create(const ProcFS& procfs, const ProcFSExposedComponent& component)
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{
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return adopt_ref(*new (nothrow) ProcFSDirectoryInode(procfs, component));
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}
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ProcFSDirectoryInode::ProcFSDirectoryInode(const ProcFS& fs, const ProcFSExposedComponent& component)
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: ProcFSInode(fs, component)
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: ProcFSGlobalInode(fs, component)
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{
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}
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@ -204,17 +196,17 @@ InodeMetadata ProcFSDirectoryInode::metadata() const
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}
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KResult ProcFSDirectoryInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
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{
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MutexLocker locker(fs().m_lock);
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return m_associated_component->traverse_as_directory(fs().fsid(), move(callback));
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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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RefPtr<Inode> ProcFSDirectoryInode::lookup(StringView name)
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{
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MutexLocker locker(fs().m_lock);
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MutexLocker locker(procfs().m_lock);
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auto component = m_associated_component->lookup(name);
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if (!component)
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return {};
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return component->to_inode(fs());
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return component->to_inode(procfs());
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}
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NonnullRefPtr<ProcFSLinkInode> ProcFSLinkInode::create(const ProcFS& procfs, const ProcFSExposedComponent& component)
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@ -223,9 +215,10 @@ NonnullRefPtr<ProcFSLinkInode> ProcFSLinkInode::create(const ProcFS& procfs, con
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}
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ProcFSLinkInode::ProcFSLinkInode(const ProcFS& fs, const ProcFSExposedComponent& component)
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: ProcFSInode(fs, 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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@ -239,4 +232,364 @@ InodeMetadata ProcFSLinkInode::metadata() const
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return metadata;
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}
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ProcFSProcessAssociatedInode::ProcFSProcessAssociatedInode(const ProcFS& 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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KResultOr<size_t> ProcFSProcessAssociatedInode::write_bytes(off_t, size_t, const UserOrKernelBuffer&, FileDescription*)
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{
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VERIFY_NOT_REACHED();
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}
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NonnullRefPtr<ProcFSProcessDirectoryInode> ProcFSProcessDirectoryInode::create(const ProcFS& procfs, ProcessID pid)
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{
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return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessDirectoryInode(procfs, pid)).release_nonnull();
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}
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ProcFSProcessDirectoryInode::ProcFSProcessDirectoryInode(const ProcFS& 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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KResult ProcFSProcessDirectoryInode::attach(FileDescription&)
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{
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return KSuccess;
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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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InodeMetadata metadata;
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metadata.inode = { fsid(), process->component_index() };
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metadata.mode = S_IFDIR | process->required_mode();
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metadata.uid = process->owner_user();
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metadata.gid = process->owner_group();
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metadata.size = 0;
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metadata.mtime = process->modified_time();
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return metadata;
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}
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KResultOr<size_t> ProcFSProcessDirectoryInode::read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const
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{
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VERIFY_NOT_REACHED();
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}
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KResult ProcFSProcessDirectoryInode::traverse_as_directory(Function<bool(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->traverse_as_directory(procfs().fsid(), move(callback));
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}
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RefPtr<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 nullptr;
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if (name == "fd")
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return ProcFSProcessSubDirectoryInode::create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::FileDescriptions, associated_pid());
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if (name == "stacks")
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return ProcFSProcessSubDirectoryInode::create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::Stacks, associated_pid());
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if (name == "unveil")
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return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Unveil, associated_pid());
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if (name == "pledge")
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return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Pledge, associated_pid());
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if (name == "fds")
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return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::FileDescriptions, associated_pid());
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if (name == "exe")
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return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::BinaryLink, associated_pid());
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if (name == "cwd")
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return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::CurrentWorkDirectoryLink, associated_pid());
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if (name == "perf_events")
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return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::PerformanceEvents, associated_pid());
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if (name == "vm")
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return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::VirtualMemoryStats, associated_pid());
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if (name == "root")
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return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::RootLink, associated_pid());
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return nullptr;
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}
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NonnullRefPtr<ProcFSProcessSubDirectoryInode> ProcFSProcessSubDirectoryInode::create(const ProcFS& procfs, SegmentedProcFSIndex::ProcessSubDirectory sub_directory_type, ProcessID pid)
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{
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return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessSubDirectoryInode(procfs, sub_directory_type, pid)).release_nonnull();
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}
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ProcFSProcessSubDirectoryInode::ProcFSProcessSubDirectoryInode(const ProcFS& 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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KResultOr<size_t> ProcFSProcessSubDirectoryInode::read_bytes(off_t, size_t, UserOrKernelBuffer&, FileDescription*) const
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{
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VERIFY_NOT_REACHED();
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}
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KResult ProcFSProcessSubDirectoryInode::attach(FileDescription&)
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{
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return KSuccess;
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}
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void ProcFSProcessSubDirectoryInode::did_seek(FileDescription&, 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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InodeMetadata metadata;
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metadata.inode = { fsid(), process->component_index() };
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metadata.mode = S_IFDIR | process->required_mode();
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metadata.uid = process->owner_user();
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metadata.gid = process->owner_group();
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metadata.size = 0;
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metadata.mtime = process->modified_time();
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return metadata;
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}
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KResult ProcFSProcessSubDirectoryInode::traverse_as_directory(Function<bool(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::FileDescriptions:
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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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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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RefPtr<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 {};
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switch (m_sub_directory_type) {
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case SegmentedProcFSIndex::ProcessSubDirectory::FileDescriptions:
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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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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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NonnullRefPtr<ProcFSProcessPropertyInode> ProcFSProcessPropertyInode::create_for_file_description_link(const ProcFS& procfs, unsigned file_description_index, ProcessID pid)
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{
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return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessPropertyInode(procfs, file_description_index, pid)).release_nonnull();
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}
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NonnullRefPtr<ProcFSProcessPropertyInode> ProcFSProcessPropertyInode::create_for_thread_stack(const ProcFS& procfs, ThreadID stack_thread_index, ProcessID pid)
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{
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return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessPropertyInode(procfs, stack_thread_index, pid)).release_nonnull();
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}
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NonnullRefPtr<ProcFSProcessPropertyInode> ProcFSProcessPropertyInode::create_for_pid_property(const ProcFS& procfs, SegmentedProcFSIndex::MainProcessProperty main_property_type, ProcessID pid)
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{
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return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessPropertyInode(procfs, main_property_type, pid)).release_nonnull();
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}
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|
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ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(const ProcFS& procfs, SegmentedProcFSIndex::MainProcessProperty main_property_type, ProcessID pid)
|
||||
: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_main_property_in_pid_directory(pid, main_property_type))
|
||||
, m_parent_sub_directory_type(SegmentedProcFSIndex::ProcessSubDirectory::Reserved)
|
||||
{
|
||||
m_possible_data.property_type = main_property_type;
|
||||
}
|
||||
|
||||
ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(const ProcFS& procfs, unsigned file_description_index, ProcessID pid)
|
||||
: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_file_description(pid, file_description_index))
|
||||
, m_parent_sub_directory_type(SegmentedProcFSIndex::ProcessSubDirectory::FileDescriptions)
|
||||
{
|
||||
m_possible_data.property_index = file_description_index;
|
||||
}
|
||||
|
||||
ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(const ProcFS& procfs, ThreadID thread_stack_index, ProcessID pid)
|
||||
: ProcFSProcessAssociatedInode(procfs, pid, SegmentedProcFSIndex::build_segmented_index_for_thread_stack(pid, thread_stack_index))
|
||||
, m_parent_sub_directory_type(SegmentedProcFSIndex::ProcessSubDirectory::Stacks)
|
||||
{
|
||||
m_possible_data.property_index = thread_stack_index.value();
|
||||
}
|
||||
|
||||
KResult ProcFSProcessPropertyInode::attach(FileDescription& description)
|
||||
{
|
||||
return refresh_data(description);
|
||||
}
|
||||
void ProcFSProcessPropertyInode::did_seek(FileDescription& 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::FileDescriptions)
|
||||
return S_IFLNK | 0400;
|
||||
if (parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Stacks)
|
||||
return S_IFREG | 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;
|
||||
if (main_property == SegmentedProcFSIndex::MainProcessProperty::RootLink)
|
||||
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 {};
|
||||
InodeMetadata metadata;
|
||||
metadata.inode = { fsid(), process->component_index() };
|
||||
metadata.mode = determine_procfs_process_inode_mode(m_parent_sub_directory_type, m_possible_data.property_type);
|
||||
metadata.uid = process->owner_user();
|
||||
metadata.gid = process->owner_group();
|
||||
metadata.size = 0;
|
||||
metadata.mtime = process->modified_time();
|
||||
return metadata;
|
||||
}
|
||||
KResult ProcFSProcessPropertyInode::traverse_as_directory(Function<bool(FileSystem::DirectoryEntryView const&)>) const
|
||||
{
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
KResultOr<size_t> ProcFSProcessPropertyInode::read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, FileDescription* 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) {
|
||||
KBufferBuilder builder;
|
||||
auto process = Process::from_pid(associated_pid());
|
||||
if (!process)
|
||||
return KResult(ESRCH);
|
||||
if (auto result = try_to_acquire_data(*process, builder); result.is_error())
|
||||
return result.error();
|
||||
auto data_buffer = builder.build();
|
||||
if (!data_buffer)
|
||||
return KResult(EFAULT);
|
||||
ssize_t nread = min(static_cast<off_t>(data_buffer->size() - offset), static_cast<off_t>(count));
|
||||
if (!buffer.write(data_buffer->data() + offset, nread))
|
||||
return KResult(EFAULT);
|
||||
return nread;
|
||||
}
|
||||
if (!description->data()) {
|
||||
dbgln("ProcFS Process Information: Do not have cached data!");
|
||||
return KResult(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));
|
||||
if (!buffer.write(data_buffer->data() + offset, nread))
|
||||
return KResult(EFAULT);
|
||||
|
||||
return nread;
|
||||
}
|
||||
RefPtr<Inode> ProcFSProcessPropertyInode::lookup(StringView)
|
||||
{
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
|
||||
static KResult build_from_cached_data(KBufferBuilder& builder, ProcFSInodeData& cached_data)
|
||||
{
|
||||
cached_data.buffer = builder.build();
|
||||
if (!cached_data.buffer)
|
||||
return ENOMEM;
|
||||
return KSuccess;
|
||||
}
|
||||
|
||||
KResult 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::FileDescriptions) {
|
||||
if (auto result = process.procfs_get_file_description_link(m_possible_data.property_index, builder); result.is_error())
|
||||
return result.error();
|
||||
return KSuccess;
|
||||
}
|
||||
if (m_parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Stacks) {
|
||||
if (auto result = process.procfs_get_thread_stack(m_possible_data.property_index, builder); result.is_error())
|
||||
return result.error();
|
||||
return KSuccess;
|
||||
}
|
||||
|
||||
VERIFY(m_parent_sub_directory_type == SegmentedProcFSIndex::ProcessSubDirectory::Reserved);
|
||||
switch (m_possible_data.property_type) {
|
||||
case SegmentedProcFSIndex::MainProcessProperty::Unveil:
|
||||
return process.procfs_get_fds_stats(builder);
|
||||
case SegmentedProcFSIndex::MainProcessProperty::Pledge:
|
||||
return process.procfs_get_pledge_stats(builder);
|
||||
case SegmentedProcFSIndex::MainProcessProperty::FileDescriptions:
|
||||
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);
|
||||
case SegmentedProcFSIndex::MainProcessProperty::RootLink:
|
||||
return process.procfs_get_root_link(builder);
|
||||
default:
|
||||
VERIFY_NOT_REACHED();
|
||||
}
|
||||
}
|
||||
|
||||
KResult ProcFSProcessPropertyInode::refresh_data(FileDescription& 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 KResult(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;
|
||||
}
|
||||
KBufferBuilder builder;
|
||||
if (auto result = try_to_acquire_data(*process, builder); result.is_error())
|
||||
return result;
|
||||
return build_from_cached_data(builder, static_cast<ProcFSInodeData&>(*cached_data));
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue