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Kernel: Handle allocation failure in ProcFS and friends

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There were many places in which allocation failure was noticed but
ignored.
This commit is contained in:
sin-ack 2021-08-14 12:39:51 +00:00 • committed by Andreas Kling
parent 134dbe2607
commit 748938ea59
8 changed files with 196 additions and 92 deletions
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155
Kernel/FileSystem/ProcFS.cpp
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@ -37,13 +37,12 @@ UNMAP_AFTER_INIT ProcFSComponentRegistry::ProcFSComponentRegistry()
{
}
RefPtr<ProcFS> ProcFS::create()
KResultOr<NonnullRefPtr<ProcFS>> ProcFS::try_create()
{
return adopt_ref_if_nonnull(new (nothrow) ProcFS);
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFS());
}
ProcFS::ProcFS()
: m_root_inode(ProcFSComponentRegistry::the().root_directory().to_inode(*this))
{
}
@ -53,6 +52,11 @@ ProcFS::~ProcFS()
KResult ProcFS::initialize()
{
auto root_inode = ProcFSComponentRegistry::the().root_directory().to_inode(*this);
if (root_inode.is_error())
return root_inode.error();
m_root_inode = static_cast<NonnullRefPtr<ProcFSDirectoryInode>>(root_inode.release_value());
return KSuccess;
}
@ -104,9 +108,9 @@ KResult ProcFSInode::truncate(u64)
return EPERM;
}
NonnullRefPtr<ProcFSGlobalInode> ProcFSGlobalInode::create(const ProcFS& fs, const ProcFSExposedComponent& component)
KResultOr<NonnullRefPtr<ProcFSGlobalInode>> ProcFSGlobalInode::try_create(const ProcFS& fs, const ProcFSExposedComponent& component)
{
return adopt_ref(*new (nothrow) ProcFSGlobalInode(fs, component));
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSGlobalInode(fs, component));
}
ProcFSGlobalInode::ProcFSGlobalInode(const ProcFS& fs, const ProcFSExposedComponent& component)
@ -169,9 +173,9 @@ KResultOr<size_t> ProcFSGlobalInode::write_bytes(off_t offset, size_t count, con
return m_associated_component->write_bytes(offset, count, buffer, fd);
}
NonnullRefPtr<ProcFSDirectoryInode> ProcFSDirectoryInode::create(const ProcFS& procfs, const ProcFSExposedComponent& component)
KResultOr<NonnullRefPtr<ProcFSDirectoryInode>> ProcFSDirectoryInode::try_create(const ProcFS& procfs, const ProcFSExposedComponent& component)
{
return adopt_ref(*new (nothrow) ProcFSDirectoryInode(procfs, component));
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSDirectoryInode(procfs, component));
}
ProcFSDirectoryInode::ProcFSDirectoryInode(const ProcFS& fs, const ProcFSExposedComponent& component)
@ -203,15 +207,21 @@ KResult ProcFSDirectoryInode::traverse_as_directory(Function<bool(FileSystem::Di
KResultOr<NonnullRefPtr<Inode>> ProcFSDirectoryInode::lookup(StringView name)
{
MutexLocker locker(procfs().m_lock);
auto component = m_associated_component->lookup(name);
if (!component)
return ENOMEM;
return component->to_inode(procfs());
auto maybe_component = m_associated_component->lookup(name);
if (maybe_component.is_error())
return maybe_component.error();
auto component = maybe_component.release_value();
auto maybe_inode = component->to_inode(procfs());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
NonnullRefPtr<ProcFSLinkInode> ProcFSLinkInode::create(const ProcFS& procfs, const ProcFSExposedComponent& component)
KResultOr<NonnullRefPtr<ProcFSLinkInode>> ProcFSLinkInode::try_create(const ProcFS& procfs, const ProcFSExposedComponent& component)
{
return adopt_ref(*new (nothrow) ProcFSLinkInode(procfs, component));
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSLinkInode(procfs, component));
}
ProcFSLinkInode::ProcFSLinkInode(const ProcFS& fs, const ProcFSExposedComponent& component)
@ -243,9 +253,9 @@ KResultOr<size_t> ProcFSProcessAssociatedInode::write_bytes(off_t, size_t, const
VERIFY_NOT_REACHED();
}
NonnullRefPtr<ProcFSProcessDirectoryInode> ProcFSProcessDirectoryInode::create(const ProcFS& procfs, ProcessID pid)
KResultOr<NonnullRefPtr<ProcFSProcessDirectoryInode>> ProcFSProcessDirectoryInode::try_create(const ProcFS& procfs, ProcessID pid)
{
return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessDirectoryInode(procfs, pid)).release_nonnull();
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessDirectoryInode(procfs, pid));
}
ProcFSProcessDirectoryInode::ProcFSProcessDirectoryInode(const ProcFS& procfs, ProcessID pid)
@ -294,32 +304,73 @@ KResultOr<NonnullRefPtr<Inode>> ProcFSProcessDirectoryInode::lookup(StringView n
auto process = Process::from_pid(associated_pid());
if (!process)
return ESRCH;
if (name == "fd")
return ProcFSProcessSubDirectoryInode::create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::FileDescriptions, associated_pid());
if (name == "stacks")
return ProcFSProcessSubDirectoryInode::create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::Stacks, associated_pid());
if (name == "unveil")
return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Unveil, associated_pid());
if (name == "pledge")
return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Pledge, associated_pid());
if (name == "fds")
return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::FileDescriptions, associated_pid());
if (name == "exe")
return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::BinaryLink, associated_pid());
if (name == "cwd")
return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::CurrentWorkDirectoryLink, associated_pid());
if (name == "perf_events")
return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::PerformanceEvents, associated_pid());
if (name == "vm")
return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::VirtualMemoryStats, associated_pid());
if (name == "root")
return ProcFSProcessPropertyInode::create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::RootLink, associated_pid());
if (name == "fd") {
auto maybe_inode = ProcFSProcessSubDirectoryInode::try_create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::FileDescriptions, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "stacks") {
auto maybe_inode = ProcFSProcessSubDirectoryInode::try_create(procfs(), SegmentedProcFSIndex::ProcessSubDirectory::Stacks, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "unveil") {
auto maybe_inode = ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Unveil, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "pledge") {
auto maybe_inode = ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::Pledge, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "fds") {
auto maybe_inode = ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::FileDescriptions, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "exe") {
auto maybe_inode = ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::BinaryLink, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "cwd") {
auto maybe_inode = ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::CurrentWorkDirectoryLink, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "perf_events") {
auto maybe_inode = ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::PerformanceEvents, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "vm") {
auto maybe_inode = ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::VirtualMemoryStats, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
if (name == "root") {
auto maybe_inode = ProcFSProcessPropertyInode::try_create_for_pid_property(procfs(), SegmentedProcFSIndex::MainProcessProperty::RootLink, associated_pid());
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
return ENOENT;
}
NonnullRefPtr<ProcFSProcessSubDirectoryInode> ProcFSProcessSubDirectoryInode::create(const ProcFS& procfs, SegmentedProcFSIndex::ProcessSubDirectory sub_directory_type, ProcessID pid)
KResultOr<NonnullRefPtr<ProcFSProcessSubDirectoryInode>> ProcFSProcessSubDirectoryInode::try_create(const ProcFS& procfs, SegmentedProcFSIndex::ProcessSubDirectory sub_directory_type, ProcessID pid)
{
return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessSubDirectoryInode(procfs, sub_directory_type, pid)).release_nonnull();
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessSubDirectoryInode(procfs, sub_directory_type, pid));
}
ProcFSProcessSubDirectoryInode::ProcFSProcessSubDirectoryInode(const ProcFS& procfs, SegmentedProcFSIndex::ProcessSubDirectory sub_directory_type, ProcessID pid)
@ -384,12 +435,18 @@ KResultOr<NonnullRefPtr<Inode>> ProcFSProcessSubDirectoryInode::lookup(StringVie
return ESRCH;
RefPtr<Inode> inode;
switch (m_sub_directory_type) {
case SegmentedProcFSIndex::ProcessSubDirectory::FileDescriptions:
inode = process->lookup_file_descriptions_directory(procfs(), name);
break;
case SegmentedProcFSIndex::ProcessSubDirectory::Stacks:
inode = process->lookup_stacks_directory(procfs(), name);
break;
case SegmentedProcFSIndex::ProcessSubDirectory::FileDescriptions: {
auto maybe_inode = process->lookup_file_descriptions_directory(procfs(), name);
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
case SegmentedProcFSIndex::ProcessSubDirectory::Stacks: {
auto maybe_inode = process->lookup_stacks_directory(procfs(), name);
if (maybe_inode.is_error())
return maybe_inode.error();
return maybe_inode.release_value();
}
default:
VERIFY_NOT_REACHED();
}
@ -398,17 +455,17 @@ KResultOr<NonnullRefPtr<Inode>> ProcFSProcessSubDirectoryInode::lookup(StringVie
return inode.release_nonnull();
}
NonnullRefPtr<ProcFSProcessPropertyInode> ProcFSProcessPropertyInode::create_for_file_description_link(const ProcFS& procfs, unsigned file_description_index, ProcessID pid)
KResultOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::try_create_for_file_description_link(const ProcFS& procfs, unsigned file_description_index, ProcessID pid)
{
return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessPropertyInode(procfs, file_description_index, pid)).release_nonnull();
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, file_description_index, pid));
}
NonnullRefPtr<ProcFSProcessPropertyInode> ProcFSProcessPropertyInode::create_for_thread_stack(const ProcFS& procfs, ThreadID stack_thread_index, ProcessID pid)
KResultOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::try_create_for_thread_stack(const ProcFS& procfs, ThreadID stack_thread_index, ProcessID pid)
{
return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessPropertyInode(procfs, stack_thread_index, pid)).release_nonnull();
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, stack_thread_index, pid));
}
NonnullRefPtr<ProcFSProcessPropertyInode> ProcFSProcessPropertyInode::create_for_pid_property(const ProcFS& procfs, SegmentedProcFSIndex::MainProcessProperty main_property_type, ProcessID pid)
KResultOr<NonnullRefPtr<ProcFSProcessPropertyInode>> ProcFSProcessPropertyInode::try_create_for_pid_property(const ProcFS& procfs, SegmentedProcFSIndex::MainProcessProperty main_property_type, ProcessID pid)
{
return adopt_ref_if_nonnull(new (nothrow) ProcFSProcessPropertyInode(procfs, main_property_type, pid)).release_nonnull();
return adopt_nonnull_ref_or_enomem(new (nothrow) ProcFSProcessPropertyInode(procfs, main_property_type, pid));
}
ProcFSProcessPropertyInode::ProcFSProcessPropertyInode(const ProcFS& procfs, SegmentedProcFSIndex::MainProcessProperty main_property_type, ProcessID pid)