mirror of
https://github.com/SerenityOS/serenity
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722ae35329
This is done by merging all scattered pieces of derived classes from the ProcFSInode class into that one class, so we don't use inheritance but rather simplistic checks to determine the proper code for each ProcFS inode with its specific characteristics.
343 lines
14 KiB
C++
343 lines
14 KiB
C++
/*
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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/JsonArraySerializer.h>
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#include <AK/JsonObjectSerializer.h>
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#include <AK/JsonValue.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/ProcFS/Inode.h>
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#include <Kernel/InterruptDisabler.h>
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#include <Kernel/KBufferBuilder.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Process.h>
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#include <Kernel/ProcessExposed.h>
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#include <Kernel/TTY/TTY.h>
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namespace Kernel {
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ErrorOr<void> Process::procfs_get_thread_stack(ThreadID thread_id, KBufferBuilder& builder) const
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{
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auto array = TRY(JsonArraySerializer<>::try_create(builder));
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auto thread = Thread::from_tid(thread_id);
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if (!thread)
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return ESRCH;
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auto current_process_credentials = Process::current().credentials();
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bool show_kernel_addresses = current_process_credentials->is_superuser();
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bool kernel_address_added = false;
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for (auto address : TRY(Processor::capture_stack_trace(*thread, 1024))) {
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if (!show_kernel_addresses && !Memory::is_user_address(VirtualAddress { address })) {
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if (kernel_address_added)
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continue;
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address = 0xdeadc0de;
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kernel_address_added = true;
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}
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TRY(array.add(address));
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}
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TRY(array.finish());
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return {};
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}
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ErrorOr<void> Process::traverse_stacks_directory(FileSystemID fsid, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
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{
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TRY(callback({ "."sv, { fsid, SegmentedProcFSIndex::build_segmented_index_for_main_property(pid(), SegmentedProcFSIndex::ProcessSubDirectory::Stacks, SegmentedProcFSIndex::MainProcessProperty::Reserved) }, 0 }));
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TRY(callback({ ".."sv, { fsid, m_procfs_traits->component_index() }, 0 }));
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return thread_list().with([&](auto& list) -> ErrorOr<void> {
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for (auto const& thread : list) {
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int tid = thread.tid().value();
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InodeIdentifier identifier = { fsid, SegmentedProcFSIndex::build_segmented_index_for_thread_stack(pid(), thread.tid()) };
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auto name = TRY(KString::number(tid));
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TRY(callback({ name->view(), identifier, 0 }));
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}
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return {};
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});
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}
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ErrorOr<NonnullLockRefPtr<Inode>> Process::lookup_stacks_directory(ProcFS const& procfs, StringView name) const
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{
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auto maybe_needle = name.to_uint();
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if (!maybe_needle.has_value())
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return ENOENT;
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auto needle = maybe_needle.release_value();
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ErrorOr<NonnullLockRefPtr<ProcFSInode>> thread_stack_inode { ENOENT };
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for_each_thread([&](Thread const& thread) {
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int tid = thread.tid().value();
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VERIFY(!(tid < 0));
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if (needle == (unsigned)tid) {
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thread_stack_inode = ProcFSInode::try_create_as_thread_stack_inode(procfs, thread.tid(), pid());
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return IterationDecision::Break;
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}
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return IterationDecision::Continue;
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});
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if (thread_stack_inode.is_error())
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return thread_stack_inode.release_error();
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return thread_stack_inode.release_value();
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}
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ErrorOr<void> Process::traverse_children_directory(FileSystemID fsid, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
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{
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TRY(callback({ "."sv, { fsid, SegmentedProcFSIndex::build_segmented_index_for_sub_directory(pid(), SegmentedProcFSIndex::ProcessSubDirectory::Children) }, 0 }));
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TRY(callback({ ".."sv, { fsid, m_procfs_traits->component_index() }, 0 }));
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return Process::for_each_in_same_jail([&](Process& process) -> ErrorOr<void> {
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if (process.ppid() == pid()) {
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StringBuilder builder;
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builder.appendff("{}", process.pid());
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TRY(callback({ builder.string_view(), { fsid, SegmentedProcFSIndex::build_segmented_index_for_children(pid(), process.pid()) }, DT_LNK }));
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}
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return {};
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});
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}
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ErrorOr<NonnullLockRefPtr<Inode>> Process::lookup_children_directory(ProcFS const& procfs, StringView name) const
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{
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auto maybe_pid = name.to_uint();
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if (!maybe_pid.has_value())
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return ENOENT;
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auto child_process = Process::from_pid_in_same_jail(*maybe_pid);
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if (!child_process || child_process->ppid() != pid())
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return ENOENT;
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return TRY(ProcFSInode::try_create_as_child_process_link_inode(procfs, *maybe_pid, pid()));
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}
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ErrorOr<size_t> Process::procfs_get_child_proccess_link(ProcessID child_pid, KBufferBuilder& builder) const
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{
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TRY(builder.appendff("../../{}", child_pid.value()));
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return builder.length();
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}
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ErrorOr<size_t> Process::procfs_get_file_description_link(unsigned fd, KBufferBuilder& builder) const
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{
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auto file_description = TRY(open_file_description(fd));
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// Note: These links are not guaranteed to point to actual VFS paths, just like in other kernels.
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auto data = TRY(file_description->pseudo_path());
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TRY(builder.append(data->view()));
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return data->length();
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}
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ErrorOr<void> Process::traverse_file_descriptions_directory(FileSystemID fsid, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)> callback) const
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{
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TRY(callback({ "."sv, { fsid, m_procfs_traits->component_index() }, 0 }));
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TRY(callback({ ".."sv, { fsid, m_procfs_traits->component_index() }, 0 }));
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size_t count = 0;
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fds().with_shared([&](auto& fds) {
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fds.enumerate([&](auto& file_description_metadata) {
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if (!file_description_metadata.is_valid()) {
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count++;
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return;
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}
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StringBuilder builder;
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builder.appendff("{}", count);
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// FIXME: Propagate errors from callback.
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(void)callback({ builder.string_view(), { fsid, SegmentedProcFSIndex::build_segmented_index_for_file_description(pid(), count) }, DT_LNK });
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count++;
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});
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});
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return {};
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}
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ErrorOr<NonnullLockRefPtr<Inode>> Process::lookup_file_descriptions_directory(ProcFS const& procfs, StringView name) const
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{
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auto maybe_index = name.to_uint();
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if (!maybe_index.has_value())
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return ENOENT;
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if (!m_fds.with_shared([&](auto& fds) { return fds.get_if_valid(*maybe_index); }))
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return ENOENT;
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return TRY(ProcFSInode::try_create_as_file_description_link_inode(procfs, *maybe_index, pid()));
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}
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ErrorOr<void> Process::procfs_get_pledge_stats(KBufferBuilder& builder) const
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{
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auto obj = TRY(JsonObjectSerializer<>::try_create(builder));
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#define __ENUMERATE_PLEDGE_PROMISE(x) \
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if (has_promised(Pledge::x)) { \
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if (!promises_builder.is_empty()) \
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TRY(promises_builder.try_append(' ')); \
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TRY(promises_builder.try_append(#x##sv)); \
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}
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if (has_promises()) {
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StringBuilder promises_builder;
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ENUMERATE_PLEDGE_PROMISES
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TRY(obj.add("promises"sv, promises_builder.string_view()));
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}
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#undef __ENUMERATE_PLEDGE_PROMISE
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TRY(obj.finish());
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return {};
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}
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ErrorOr<void> Process::procfs_get_unveil_stats(KBufferBuilder& builder) const
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{
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auto array = TRY(JsonArraySerializer<>::try_create(builder));
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TRY(m_unveil_data.with([&](auto& unveil_data) -> ErrorOr<void> {
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TRY(unveil_data.paths.for_each_node_in_tree_order([&](auto const& unveiled_path) -> ErrorOr<IterationDecision> {
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if (!unveiled_path.was_explicitly_unveiled())
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return IterationDecision::Continue;
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auto obj = TRY(array.add_object());
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TRY(obj.add("path"sv, unveiled_path.path()));
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StringBuilder permissions_builder;
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if (unveiled_path.permissions() & UnveilAccess::Read)
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permissions_builder.append('r');
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if (unveiled_path.permissions() & UnveilAccess::Write)
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permissions_builder.append('w');
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if (unveiled_path.permissions() & UnveilAccess::Execute)
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permissions_builder.append('x');
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if (unveiled_path.permissions() & UnveilAccess::CreateOrRemove)
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permissions_builder.append('c');
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if (unveiled_path.permissions() & UnveilAccess::Browse)
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permissions_builder.append('b');
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TRY(obj.add("permissions"sv, permissions_builder.string_view()));
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TRY(obj.finish());
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return IterationDecision::Continue;
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}));
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return {};
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}));
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TRY(array.finish());
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return {};
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}
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ErrorOr<void> Process::procfs_get_perf_events(KBufferBuilder& builder) const
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{
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InterruptDisabler disabler;
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if (!perf_events()) {
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dbgln("ProcFS: No perf events for {}", pid());
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return Error::from_errno(ENOBUFS);
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}
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return perf_events()->to_json(builder);
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}
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ErrorOr<void> Process::procfs_get_fds_stats(KBufferBuilder& builder) const
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{
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auto array = TRY(JsonArraySerializer<>::try_create(builder));
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return fds().with_shared([&](auto& fds) -> ErrorOr<void> {
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if (fds.open_count() == 0) {
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TRY(array.finish());
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return {};
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}
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size_t count = 0;
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TRY(fds.try_enumerate([&](auto& file_description_metadata) -> ErrorOr<void> {
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if (!file_description_metadata.is_valid()) {
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count++;
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return {};
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}
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bool cloexec = file_description_metadata.flags() & FD_CLOEXEC;
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LockRefPtr<OpenFileDescription> description = file_description_metadata.description();
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auto description_object = TRY(array.add_object());
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TRY(description_object.add("fd"sv, count));
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// TODO: Better OOM handling.
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auto pseudo_path_or_error = description->pseudo_path();
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TRY(description_object.add("absolute_path"sv, pseudo_path_or_error.is_error() ? "???"sv : pseudo_path_or_error.value()->view()));
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TRY(description_object.add("seekable"sv, description->file().is_seekable()));
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TRY(description_object.add("class"sv, description->file().class_name()));
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TRY(description_object.add("offset"sv, description->offset()));
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TRY(description_object.add("cloexec"sv, cloexec));
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TRY(description_object.add("blocking"sv, description->is_blocking()));
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TRY(description_object.add("can_read"sv, description->can_read()));
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TRY(description_object.add("can_write"sv, description->can_write()));
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Inode* inode = description->inode();
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if (inode != nullptr) {
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auto inode_object = TRY(description_object.add_object("inode"sv));
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TRY(inode_object.add("fsid"sv, inode->fsid().value()));
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TRY(inode_object.add("index"sv, inode->index().value()));
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TRY(inode_object.finish());
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}
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TRY(description_object.finish());
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count++;
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return {};
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}));
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TRY(array.finish());
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return {};
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});
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}
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ErrorOr<void> Process::procfs_get_virtual_memory_stats(KBufferBuilder& builder) const
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{
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auto array = TRY(JsonArraySerializer<>::try_create(builder));
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TRY(address_space().with([&](auto& space) -> ErrorOr<void> {
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for (auto const& region : space->region_tree().regions()) {
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auto current_process_credentials = Process::current().credentials();
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if (!region.is_user() && !current_process_credentials->is_superuser())
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continue;
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auto region_object = TRY(array.add_object());
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TRY(region_object.add("readable"sv, region.is_readable()));
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TRY(region_object.add("writable"sv, region.is_writable()));
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TRY(region_object.add("executable"sv, region.is_executable()));
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TRY(region_object.add("stack"sv, region.is_stack()));
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TRY(region_object.add("shared"sv, region.is_shared()));
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TRY(region_object.add("syscall"sv, region.is_syscall_region()));
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TRY(region_object.add("purgeable"sv, region.vmobject().is_anonymous()));
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if (region.vmobject().is_anonymous()) {
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TRY(region_object.add("volatile"sv, static_cast<Memory::AnonymousVMObject const&>(region.vmobject()).is_volatile()));
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}
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TRY(region_object.add("cacheable"sv, region.is_cacheable()));
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TRY(region_object.add("address"sv, region.vaddr().get()));
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TRY(region_object.add("size"sv, region.size()));
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TRY(region_object.add("amount_resident"sv, region.amount_resident()));
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TRY(region_object.add("amount_dirty"sv, region.amount_dirty()));
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TRY(region_object.add("cow_pages"sv, region.cow_pages()));
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TRY(region_object.add("name"sv, region.name()));
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TRY(region_object.add("vmobject"sv, region.vmobject().class_name()));
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StringBuilder pagemap_builder;
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for (size_t i = 0; i < region.page_count(); ++i) {
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auto page = region.physical_page(i);
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if (!page)
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pagemap_builder.append('N');
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else if (page->is_shared_zero_page() || page->is_lazy_committed_page())
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pagemap_builder.append('Z');
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else
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pagemap_builder.append('P');
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}
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TRY(region_object.add("pagemap"sv, pagemap_builder.string_view()));
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TRY(region_object.finish());
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}
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return {};
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}));
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TRY(array.finish());
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return {};
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}
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ErrorOr<void> Process::procfs_get_current_work_directory_link(KBufferBuilder& builder) const
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{
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return builder.append(TRY(const_cast<Process&>(*this).current_directory()->try_serialize_absolute_path())->view());
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}
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ErrorOr<void> Process::procfs_get_command_line(KBufferBuilder& builder) const
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{
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auto array = TRY(JsonArraySerializer<>::try_create(builder));
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for (auto const& arg : arguments()) {
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TRY(array.add(arg.view()));
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}
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TRY(array.finish());
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return {};
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}
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mode_t Process::binary_link_required_mode() const
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{
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if (!executable())
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return 0;
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return m_procfs_traits->required_mode();
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}
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ErrorOr<void> Process::procfs_get_binary_link(KBufferBuilder& builder) const
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{
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auto custody = executable();
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if (!custody)
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return Error::from_errno(ENOEXEC);
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return builder.append(TRY(custody->try_serialize_absolute_path())->view());
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}
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}
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