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ladybird/Kernel/FileSystem/ProcFS.cpp
Andreas Kling 8415866c03 Kernel: Remove user/kernel flags from Region 
Now that we no longer need to support the signal trampolines being
user-accessible inside the kernel memory range, we can get rid of the
"kernel" and "user-accessible" flags on Region and simply use the
address of the region to determine whether it's kernel or user.

This also tightens the page table mapping code, since it can now set
user-accessibility based solely on the virtual address of a page.
2021-02-14 01:34:23 +01:00

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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/JsonArraySerializer.h>
#include <AK/JsonObject.h>
#include <AK/JsonObjectSerializer.h>
#include <AK/JsonValue.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Arch/i386/ProcessorInfo.h>
#include <Kernel/CommandLine.h>
#include <Kernel/Console.h>
#include <Kernel/DMI.h>
#include <Kernel/Debug.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/Devices/KeyboardDevice.h>
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/FileBackedFileSystem.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/FileSystem/ProcFS.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Heap/kmalloc.h>
#include <Kernel/Interrupts/GenericInterruptHandler.h>
#include <Kernel/Interrupts/InterruptManagement.h>
#include <Kernel/KBufferBuilder.h>
#include <Kernel/KSyms.h>
#include <Kernel/Module.h>
#include <Kernel/Net/LocalSocket.h>
#include <Kernel/Net/NetworkAdapter.h>
#include <Kernel/Net/Routing.h>
#include <Kernel/Net/TCPSocket.h>
#include <Kernel/Net/UDPSocket.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/PerformanceEventBuffer.h>
#include <Kernel/Process.h>
#include <Kernel/Scheduler.h>
#include <Kernel/StdLib.h>
#include <Kernel/TTY/TTY.h>
#include <Kernel/VM/AnonymousVMObject.h>
#include <Kernel/VM/MemoryManager.h>
#include <LibC/errno_numbers.h>
namespace Kernel {
enum ProcParentDirectory {
PDI_AbstractRoot = 0,
PDI_Root,
PDI_Root_sys,
PDI_Root_net,
PDI_PID,
PDI_PID_fd,
PDI_PID_stacks,
};
static_assert(PDI_PID_stacks < 16, "Too many directories for identifier scheme");
enum ProcFileType {
FI_Invalid = 0,
FI_Root = 1, // directory
__FI_Root_Start,
FI_Root_df,
FI_Root_all,
FI_Root_memstat,
FI_Root_cpuinfo,
FI_Root_dmesg,
FI_Root_interrupts,
FI_Root_dmi,
FI_Root_smbios_entry_point,
FI_Root_keymap,
FI_Root_pci,
FI_Root_devices,
FI_Root_uptime,
FI_Root_cmdline,
FI_Root_modules,
FI_Root_profile,
FI_Root_self, // symlink
FI_Root_sys, // directory
FI_Root_net, // directory
__FI_Root_End,
FI_Root_sys_variable,
FI_Root_net_adapters,
FI_Root_net_arp,
FI_Root_net_tcp,
FI_Root_net_udp,
FI_Root_net_local,
FI_PID,
__FI_PID_Start,
FI_PID_perf_events,
FI_PID_vm,
FI_PID_stacks, // directory
FI_PID_fds,
FI_PID_unveil,
FI_PID_exe, // symlink
FI_PID_cwd, // symlink
FI_PID_root, // symlink
FI_PID_fd, // directory
__FI_PID_End,
FI_MaxStaticFileIndex,
};
static inline ProcessID to_pid(const InodeIdentifier& identifier)
{
return identifier.index().value() >> 16u;
}
static inline ThreadID to_tid(const InodeIdentifier& identifier)
{
// Sneakily, use the exact same mechanism.
return to_pid(identifier).value();
}
static inline ProcParentDirectory to_proc_parent_directory(const InodeIdentifier& identifier)
{
return (ProcParentDirectory)((identifier.index().value() >> 12) & 0xf);
}
static inline ProcFileType to_proc_file_type(const InodeIdentifier& identifier)
{
return (ProcFileType)(identifier.index().value() & 0xff);
}
static inline int to_fd(const InodeIdentifier& identifier)
{
ASSERT(to_proc_parent_directory(identifier) == PDI_PID_fd);
return (identifier.index().value() & 0xff) - FI_MaxStaticFileIndex;
}
static inline size_t to_sys_index(const InodeIdentifier& identifier)
{
ASSERT(to_proc_parent_directory(identifier) == PDI_Root_sys);
ASSERT(to_proc_file_type(identifier) == FI_Root_sys_variable);
return identifier.index().value() >> 16u;
}
static inline InodeIdentifier to_identifier(unsigned fsid, ProcParentDirectory parent, ProcessID pid, ProcFileType proc_file_type)
{
return { fsid, ((unsigned)parent << 12u) | ((unsigned)pid.value() << 16u) | (unsigned)proc_file_type };
}
static inline InodeIdentifier to_identifier_with_fd(unsigned fsid, ProcessID pid, int fd)
{
return { fsid, (PDI_PID_fd << 12u) | ((unsigned)pid.value() << 16u) | (FI_MaxStaticFileIndex + fd) };
}
static inline InodeIdentifier to_identifier_with_stack(unsigned fsid, ThreadID tid)
{
return { fsid, (PDI_PID_stacks << 12u) | ((unsigned)tid.value() << 16u) | FI_MaxStaticFileIndex };
}
static inline InodeIdentifier sys_var_to_identifier(unsigned fsid, unsigned index)
{
ASSERT(index < 256);
return { fsid, (PDI_Root_sys << 12u) | (index << 16u) | FI_Root_sys_variable };
}
static inline InodeIdentifier to_parent_id(const InodeIdentifier& identifier)
{
switch (to_proc_parent_directory(identifier)) {
case PDI_AbstractRoot:
case PDI_Root:
return { identifier.fsid(), FI_Root };
case PDI_Root_sys:
return { identifier.fsid(), FI_Root_sys };
case PDI_Root_net:
return { identifier.fsid(), FI_Root_net };
case PDI_PID:
return to_identifier(identifier.fsid(), PDI_Root, to_pid(identifier), FI_PID);
case PDI_PID_fd:
return to_identifier(identifier.fsid(), PDI_PID, to_pid(identifier), FI_PID_fd);
case PDI_PID_stacks:
return to_identifier(identifier.fsid(), PDI_PID, to_pid(identifier), FI_PID_stacks);
}
ASSERT_NOT_REACHED();
}
#if 0
static inline u8 to_unused_metadata(const InodeIdentifier& identifier)
{
return (identifier.index() >> 8) & 0xf;
}
#endif
static inline bool is_process_related_file(const InodeIdentifier& identifier)
{
if (to_proc_file_type(identifier) == FI_PID)
return true;
auto proc_parent_directory = to_proc_parent_directory(identifier);
switch (proc_parent_directory) {
case PDI_PID:
case PDI_PID_fd:
return true;
default:
return false;
}
}
static inline bool is_thread_related_file(const InodeIdentifier& identifier)
{
auto proc_parent_directory = to_proc_parent_directory(identifier);
return proc_parent_directory == PDI_PID_stacks;
}
static inline bool is_directory(const InodeIdentifier& identifier)
{
auto proc_file_type = to_proc_file_type(identifier);
switch (proc_file_type) {
case FI_Root:
case FI_Root_sys:
case FI_Root_net:
case FI_PID:
case FI_PID_fd:
case FI_PID_stacks:
return true;
default:
return false;
}
}
static inline bool is_persistent_inode(const InodeIdentifier& identifier)
{
return to_proc_parent_directory(identifier) == PDI_Root_sys;
}
struct ProcFSInodeData : public FileDescriptionData {
RefPtr<KBufferImpl> buffer;
};
NonnullRefPtr<ProcFS> ProcFS::create()
{
return adopt(*new ProcFS);
}
ProcFS::~ProcFS()
{
}
static bool procfs$pid_fds(InodeIdentifier identifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
auto process = Process::from_pid(to_pid(identifier));
if (!process) {
array.finish();
return true;
}
if (process->number_of_open_file_descriptors() == 0) {
array.finish();
return true;
}
for (int i = 0; i < process->max_open_file_descriptors(); ++i) {
auto description = process->file_description(i);
if (!description)
continue;
bool cloexec = process->fd_flags(i) & FD_CLOEXEC;
auto description_object = array.add_object();
description_object.add("fd", i);
description_object.add("absolute_path", description->absolute_path());
description_object.add("seekable", description->file().is_seekable());
description_object.add("class", description->file().class_name());
description_object.add("offset", description->offset());
description_object.add("cloexec", cloexec);
description_object.add("blocking", description->is_blocking());
description_object.add("can_read", description->can_read());
description_object.add("can_write", description->can_write());
}
array.finish();
return true;
}
static bool procfs$pid_fd_entry(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto process = Process::from_pid(to_pid(identifier));
if (!process)
return false;
int fd = to_fd(identifier);
auto description = process->file_description(fd);
if (!description)
return false;
builder.append_bytes(description->absolute_path().bytes());
return true;
}
static bool procfs$pid_vm(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto process = Process::from_pid(to_pid(identifier));
if (!process)
return false;
JsonArraySerializer array { builder };
{
ScopedSpinLock lock(process->space().get_lock());
for (auto& region : process->space().regions()) {
if (!region.is_user() && !Process::current()->is_superuser())
continue;
auto region_object = array.add_object();
region_object.add("readable", region.is_readable());
region_object.add("writable", region.is_writable());
region_object.add("executable", region.is_executable());
region_object.add("stack", region.is_stack());
region_object.add("shared", region.is_shared());
region_object.add("syscall", region.is_syscall_region());
region_object.add("purgeable", region.vmobject().is_anonymous());
if (region.vmobject().is_anonymous()) {
region_object.add("volatile", static_cast<const AnonymousVMObject&>(region.vmobject()).is_any_volatile());
}
region_object.add("cacheable", region.is_cacheable());
region_object.add("address", region.vaddr().get());
region_object.add("size", region.size());
region_object.add("amount_resident", region.amount_resident());
region_object.add("amount_dirty", region.amount_dirty());
region_object.add("cow_pages", region.cow_pages());
region_object.add("name", region.name());
region_object.add("vmobject", region.vmobject().class_name());
StringBuilder pagemap_builder;
for (size_t i = 0; i < region.page_count(); ++i) {
auto* page = region.physical_page(i);
if (!page)
pagemap_builder.append('N');
else if (page->is_shared_zero_page() || page->is_lazy_committed_page())
pagemap_builder.append('Z');
else
pagemap_builder.append('P');
}
region_object.add("pagemap", pagemap_builder.to_string());
}
}
array.finish();
return true;
}
static bool procfs$pci(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
PCI::enumerate([&array](PCI::Address address, PCI::ID id) {
auto obj = array.add_object();
obj.add("seg", address.seg());
obj.add("bus", address.bus());
obj.add("device", address.device());
obj.add("function", address.function());
obj.add("vendor_id", id.vendor_id);
obj.add("device_id", id.device_id);
obj.add("revision_id", PCI::get_revision_id(address));
obj.add("subclass", PCI::get_subclass(address));
obj.add("class", PCI::get_class(address));
obj.add("subsystem_id", PCI::get_subsystem_id(address));
obj.add("subsystem_vendor_id", PCI::get_subsystem_vendor_id(address));
});
array.finish();
return true;
}
static bool procfs$dmi(InodeIdentifier, KBufferBuilder& builder)
{
if (!DMIExpose::the().is_available())
return false;
auto structures_ptr = DMIExpose::the().structure_table();
builder.append_bytes(ReadonlyBytes { structures_ptr->data(), structures_ptr->size() });
return true;
}
static bool procfs$smbios_entry_point(InodeIdentifier, KBufferBuilder& builder)
{
if (!DMIExpose::the().is_available())
return false;
auto structures_ptr = DMIExpose::the().entry_point();
builder.append_bytes(ReadonlyBytes { structures_ptr->data(), structures_ptr->size() });
return true;
}
static bool procfs$interrupts(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
InterruptManagement::the().enumerate_interrupt_handlers([&array](GenericInterruptHandler& handler) {
auto obj = array.add_object();
obj.add("purpose", handler.purpose());
obj.add("interrupt_line", handler.interrupt_number());
obj.add("controller", handler.controller());
obj.add("cpu_handler", 0); // FIXME: Determine the responsible CPU for each interrupt handler.
obj.add("device_sharing", (unsigned)handler.sharing_devices_count());
obj.add("call_count", (unsigned)handler.get_invoking_count());
});
array.finish();
return true;
}
static bool procfs$keymap(InodeIdentifier, KBufferBuilder& builder)
{
JsonObjectSerializer<KBufferBuilder> json { builder };
json.add("keymap", KeyboardDevice::the().keymap_name());
json.finish();
return true;
}
static bool procfs$devices(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
Device::for_each([&array](auto& device) {
auto obj = array.add_object();
obj.add("major", device.major());
obj.add("minor", device.minor());
obj.add("class_name", device.class_name());
if (device.is_block_device())
obj.add("type", "block");
else if (device.is_character_device())
obj.add("type", "character");
else
ASSERT_NOT_REACHED();
});
array.finish();
return true;
}
static bool procfs$uptime(InodeIdentifier, KBufferBuilder& builder)
{
builder.appendff("{}\n", TimeManagement::the().uptime_ms() / 1000);
return true;
}
static bool procfs$cmdline(InodeIdentifier, KBufferBuilder& builder)
{
builder.append(kernel_command_line().string());
builder.append('\n');
return true;
}
static bool procfs$modules(InodeIdentifier, KBufferBuilder& builder)
{
extern HashMap<String, OwnPtr<Module>>* g_modules;
JsonArraySerializer array { builder };
for (auto& it : *g_modules) {
auto obj = array.add_object();
obj.add("name", it.value->name);
obj.add("module_init", it.value->module_init);
obj.add("module_fini", it.value->module_fini);
u32 size = 0;
for (auto& section : it.value->sections) {
size += section.capacity();
}
obj.add("size", size);
}
array.finish();
return true;
}
static bool procfs$pid_perf_events(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto process = Process::from_pid(to_pid(identifier));
if (!process)
return false;
InterruptDisabler disabler;
if (!process->executable())
return false;
if (!process->perf_events())
return false;
return process->perf_events()->to_json(builder, process->pid(), process->executable()->absolute_path());
}
static bool procfs$net_adapters(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
NetworkAdapter::for_each([&array](auto& adapter) {
auto obj = array.add_object();
obj.add("name", adapter.name());
obj.add("class_name", adapter.class_name());
obj.add("mac_address", adapter.mac_address().to_string());
if (!adapter.ipv4_address().is_zero()) {
obj.add("ipv4_address", adapter.ipv4_address().to_string());
obj.add("ipv4_netmask", adapter.ipv4_netmask().to_string());
}
if (!adapter.ipv4_gateway().is_zero())
obj.add("ipv4_gateway", adapter.ipv4_gateway().to_string());
obj.add("packets_in", adapter.packets_in());
obj.add("bytes_in", adapter.bytes_in());
obj.add("packets_out", adapter.packets_out());
obj.add("bytes_out", adapter.bytes_out());
obj.add("link_up", adapter.link_up());
obj.add("mtu", adapter.mtu());
});
array.finish();
return true;
}
static bool procfs$net_arp(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
LOCKER(arp_table().lock(), Lock::Mode::Shared);
for (auto& it : arp_table().resource()) {
auto obj = array.add_object();
obj.add("mac_address", it.value.to_string());
obj.add("ip_address", it.key.to_string());
}
array.finish();
return true;
}
static bool procfs$net_tcp(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
TCPSocket::for_each([&array](auto& socket) {
auto obj = array.add_object();
obj.add("local_address", socket.local_address().to_string());
obj.add("local_port", socket.local_port());
obj.add("peer_address", socket.peer_address().to_string());
obj.add("peer_port", socket.peer_port());
obj.add("state", TCPSocket::to_string(socket.state()));
obj.add("ack_number", socket.ack_number());
obj.add("sequence_number", socket.sequence_number());
obj.add("packets_in", socket.packets_in());
obj.add("bytes_in", socket.bytes_in());
obj.add("packets_out", socket.packets_out());
obj.add("bytes_out", socket.bytes_out());
});
array.finish();
return true;
}
static bool procfs$net_udp(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
UDPSocket::for_each([&array](auto& socket) {
auto obj = array.add_object();
obj.add("local_address", socket.local_address().to_string());
obj.add("local_port", socket.local_port());
obj.add("peer_address", socket.peer_address().to_string());
obj.add("peer_port", socket.peer_port());
});
array.finish();
return true;
}
static bool procfs$net_local(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
LocalSocket::for_each([&array](auto& socket) {
auto obj = array.add_object();
obj.add("path", String(socket.socket_path()));
obj.add("origin_pid", socket.origin_pid());
obj.add("origin_uid", socket.origin_uid());
obj.add("origin_gid", socket.origin_gid());
obj.add("acceptor_pid", socket.acceptor_pid());
obj.add("acceptor_uid", socket.acceptor_uid());
obj.add("acceptor_gid", socket.acceptor_gid());
});
array.finish();
return true;
}
static bool procfs$pid_unveil(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto process = Process::from_pid(to_pid(identifier));
if (!process)
return false;
JsonArraySerializer array { builder };
for (auto& unveiled_path : process->unveiled_paths()) {
if (!unveiled_path.was_explicitly_unveiled())
continue;
auto obj = array.add_object();
obj.add("path", unveiled_path.path());
StringBuilder permissions_builder;
if (unveiled_path.permissions() & UnveilAccess::Read)
permissions_builder.append('r');
if (unveiled_path.permissions() & UnveilAccess::Write)
permissions_builder.append('w');
if (unveiled_path.permissions() & UnveilAccess::Execute)
permissions_builder.append('x');
if (unveiled_path.permissions() & UnveilAccess::CreateOrRemove)
permissions_builder.append('c');
if (unveiled_path.permissions() & UnveilAccess::Browse)
permissions_builder.append('b');
obj.add("permissions", permissions_builder.to_string());
}
array.finish();
return true;
}
static bool procfs$tid_stack(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto thread = Thread::from_tid(to_tid(identifier));
if (!thread)
return false;
JsonArraySerializer array { builder };
bool show_kernel_addresses = Process::current()->is_superuser();
for (auto address : Processor::capture_stack_trace(*thread, 1024)) {
if (!show_kernel_addresses && !is_user_address(VirtualAddress { address }))
address = 0xdeadc0de;
array.add(JsonValue(address));
}
array.finish();
return true;
}
static bool procfs$pid_exe(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto process = Process::from_pid(to_pid(identifier));
if (!process)
return false;
auto* custody = process->executable();
ASSERT(custody);
builder.append(custody->absolute_path().bytes());
return true;
}
static bool procfs$pid_cwd(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto process = Process::from_pid(to_pid(identifier));
if (!process)
return false;
builder.append_bytes(process->current_directory().absolute_path().bytes());
return true;
}
static bool procfs$pid_root(InodeIdentifier identifier, KBufferBuilder& builder)
{
auto process = Process::from_pid(to_pid(identifier));
if (!process)
return false;
builder.append_bytes(process->root_directory_relative_to_global_root().absolute_path().to_byte_buffer());
return true;
}
static bool procfs$self(InodeIdentifier, KBufferBuilder& builder)
{
builder.appendff("{}", Process::current()->pid().value());
return true;
}
static bool procfs$dmesg(InodeIdentifier, KBufferBuilder& builder)
{
InterruptDisabler disabler;
for (char ch : Console::the().logbuffer())
builder.append(ch);
return true;
}
static bool procfs$df(InodeIdentifier, KBufferBuilder& builder)
{
// FIXME: This is obviously racy against the VFS mounts changing.
JsonArraySerializer array { builder };
VFS::the().for_each_mount([&array](auto& mount) {
auto& fs = mount.guest_fs();
auto fs_object = array.add_object();
fs_object.add("class_name", fs.class_name());
fs_object.add("total_block_count", fs.total_block_count());
fs_object.add("free_block_count", fs.free_block_count());
fs_object.add("total_inode_count", fs.total_inode_count());
fs_object.add("free_inode_count", fs.free_inode_count());
fs_object.add("mount_point", mount.absolute_path());
fs_object.add("block_size", static_cast<u64>(fs.block_size()));
fs_object.add("readonly", fs.is_readonly());
fs_object.add("mount_flags", mount.flags());
if (fs.is_file_backed())
fs_object.add("source", static_cast<const FileBackedFS&>(fs).file_description().absolute_path());
else
fs_object.add("source", "none");
});
array.finish();
return true;
}
static bool procfs$cpuinfo(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
Processor::for_each(
[&](Processor& proc) -> IterationDecision {
auto& info = proc.info();
auto obj = array.add_object();
JsonArray features;
for (auto& feature : info.features().split(' '))
features.append(feature);
obj.add("processor", proc.get_id());
obj.add("cpuid", info.cpuid());
obj.add("family", info.display_family());
obj.add("features", features);
obj.add("model", info.display_model());
obj.add("stepping", info.stepping());
obj.add("type", info.type());
obj.add("brandstr", info.brandstr());
return IterationDecision::Continue;
});
array.finish();
return true;
}
static bool procfs$memstat(InodeIdentifier, KBufferBuilder& builder)
{
InterruptDisabler disabler;
kmalloc_stats stats;
get_kmalloc_stats(stats);
ScopedSpinLock mm_lock(s_mm_lock);
auto user_physical_pages_total = MM.user_physical_pages();
auto user_physical_pages_used = MM.user_physical_pages_used();
auto user_physical_pages_committed = MM.user_physical_pages_committed();
auto user_physical_pages_uncommitted = MM.user_physical_pages_uncommitted();
auto super_physical_total = MM.super_physical_pages();
auto super_physical_used = MM.super_physical_pages_used();
mm_lock.unlock();
JsonObjectSerializer<KBufferBuilder> json { builder };
json.add("kmalloc_allocated", stats.bytes_allocated);
json.add("kmalloc_available", stats.bytes_free);
json.add("kmalloc_eternal_allocated", stats.bytes_eternal);
json.add("user_physical_allocated", user_physical_pages_used);
json.add("user_physical_available", user_physical_pages_total - user_physical_pages_used);
json.add("user_physical_committed", user_physical_pages_committed);
json.add("user_physical_uncommitted", user_physical_pages_uncommitted);
json.add("super_physical_allocated", super_physical_used);
json.add("super_physical_available", super_physical_total - super_physical_used);
json.add("kmalloc_call_count", stats.kmalloc_call_count);
json.add("kfree_call_count", stats.kfree_call_count);
slab_alloc_stats([&json](size_t slab_size, size_t num_allocated, size_t num_free) {
auto prefix = String::formatted("slab_{}", slab_size);
json.add(String::formatted("{}_num_allocated", prefix), num_allocated);
json.add(String::formatted("{}_num_free", prefix), num_free);
});
json.finish();
return true;
}
static bool procfs$all(InodeIdentifier, KBufferBuilder& builder)
{
JsonArraySerializer array { builder };
// Keep this in sync with CProcessStatistics.
auto build_process = [&](const Process& process) {
auto process_object = array.add_object();
if (process.is_user_process()) {
StringBuilder pledge_builder;
#define __ENUMERATE_PLEDGE_PROMISE(promise) \
if (process.has_promised(Pledge::promise)) { \
pledge_builder.append(#promise " "); \
}
ENUMERATE_PLEDGE_PROMISES
#undef __ENUMERATE_PLEDGE_PROMISE
process_object.add("pledge", pledge_builder.to_string());
switch (process.veil_state()) {
case VeilState::None:
process_object.add("veil", "None");
break;
case VeilState::Dropped:
process_object.add("veil", "Dropped");
break;
case VeilState::Locked:
process_object.add("veil", "Locked");
break;
}
} else {
process_object.add("pledge", String());
process_object.add("veil", String());
}
process_object.add("pid", process.pid().value());
process_object.add("pgid", process.tty() ? process.tty()->pgid().value() : 0);
process_object.add("pgp", process.pgid().value());
process_object.add("sid", process.sid().value());
process_object.add("uid", process.uid());
process_object.add("gid", process.gid());
process_object.add("ppid", process.ppid().value());
process_object.add("nfds", process.number_of_open_file_descriptors());
process_object.add("name", process.name());
process_object.add("executable", process.executable() ? process.executable()->absolute_path() : "");
process_object.add("tty", process.tty() ? process.tty()->tty_name() : "notty");
process_object.add("amount_virtual", process.space().amount_virtual());
process_object.add("amount_resident", process.space().amount_resident());
process_object.add("amount_dirty_private", process.space().amount_dirty_private());
process_object.add("amount_clean_inode", process.space().amount_clean_inode());
process_object.add("amount_shared", process.space().amount_shared());
process_object.add("amount_purgeable_volatile", process.space().amount_purgeable_volatile());
process_object.add("amount_purgeable_nonvolatile", process.space().amount_purgeable_nonvolatile());
process_object.add("dumpable", process.is_dumpable());
auto thread_array = process_object.add_array("threads");
process.for_each_thread([&](const Thread& thread) {
auto thread_object = thread_array.add_object();
thread_object.add("tid", thread.tid().value());
thread_object.add("name", thread.name());
thread_object.add("times_scheduled", thread.times_scheduled());
thread_object.add("ticks_user", thread.ticks_in_user());
thread_object.add("ticks_kernel", thread.ticks_in_kernel());
thread_object.add("state", thread.state_string());
thread_object.add("cpu", thread.cpu());
thread_object.add("priority", thread.priority());
thread_object.add("syscall_count", thread.syscall_count());
thread_object.add("inode_faults", thread.inode_faults());
thread_object.add("zero_faults", thread.zero_faults());
thread_object.add("cow_faults", thread.cow_faults());
thread_object.add("file_read_bytes", thread.file_read_bytes());
thread_object.add("file_write_bytes", thread.file_write_bytes());
thread_object.add("unix_socket_read_bytes", thread.unix_socket_read_bytes());
thread_object.add("unix_socket_write_bytes", thread.unix_socket_write_bytes());
thread_object.add("ipv4_socket_read_bytes", thread.ipv4_socket_read_bytes());
thread_object.add("ipv4_socket_write_bytes", thread.ipv4_socket_write_bytes());
return IterationDecision::Continue;
});
};
ScopedSpinLock lock(g_scheduler_lock);
auto processes = Process::all_processes();
build_process(*Scheduler::colonel());
for (auto& process : processes)
build_process(process);
array.finish();
return true;
}
struct SysVariable {
String name;
enum class Type : u8 {
Invalid,
Boolean,
String,
};
Type type { Type::Invalid };
Function<void()> notify_callback;
void* address { nullptr };
static SysVariable& for_inode(InodeIdentifier);
void notify()
{
if (notify_callback)
notify_callback();
}
};
static Vector<SysVariable, 16>* s_sys_variables;
static inline Vector<SysVariable, 16>& sys_variables()
{
if (s_sys_variables == nullptr) {
s_sys_variables = new Vector<SysVariable, 16>;
s_sys_variables->append({ "", SysVariable::Type::Invalid, nullptr, nullptr });
}
return *s_sys_variables;
}
SysVariable& SysVariable::for_inode(InodeIdentifier id)
{
auto index = to_sys_index(id);
if (index >= sys_variables().size())
return sys_variables()[0];
auto& variable = sys_variables()[index];
ASSERT(variable.address);
return variable;
}
static bool read_sys_bool(InodeIdentifier inode_id, KBufferBuilder& builder)
{
auto& variable = SysVariable::for_inode(inode_id);
ASSERT(variable.type == SysVariable::Type::Boolean);
u8 buffer[2];
auto* lockable_bool = reinterpret_cast<Lockable<bool>*>(variable.address);
{
LOCKER(lockable_bool->lock(), Lock::Mode::Shared);
buffer[0] = lockable_bool->resource() ? '1' : '0';
}
buffer[1] = '\n';
builder.append_bytes(ReadonlyBytes { buffer, sizeof(buffer) });
return true;
}
static ssize_t write_sys_bool(InodeIdentifier inode_id, const UserOrKernelBuffer& buffer, size_t size)
{
auto& variable = SysVariable::for_inode(inode_id);
ASSERT(variable.type == SysVariable::Type::Boolean);
char value = 0;
bool did_read = false;
ssize_t nread = buffer.read_buffered<1>(1, [&](const u8* data, size_t) {
if (did_read)
return 0;
value = (char)data[0];
did_read = true;
return 1;
});
if (nread < 0)
return nread;
ASSERT(nread == 0 || (nread == 1 && did_read));
if (nread == 0 || !(value == '0' || value == '1'))
return (ssize_t)size;
auto* lockable_bool = reinterpret_cast<Lockable<bool>*>(variable.address);
{
LOCKER(lockable_bool->lock());
lockable_bool->resource() = value == '1';
}
variable.notify();
return (ssize_t)size;
}
static bool read_sys_string(InodeIdentifier inode_id, KBufferBuilder& builder)
{
auto& variable = SysVariable::for_inode(inode_id);
ASSERT(variable.type == SysVariable::Type::String);
auto* lockable_string = reinterpret_cast<Lockable<String>*>(variable.address);
LOCKER(lockable_string->lock(), Lock::Mode::Shared);
builder.append_bytes(lockable_string->resource().bytes());
return true;
}
static ssize_t write_sys_string(InodeIdentifier inode_id, const UserOrKernelBuffer& buffer, size_t size)
{
auto& variable = SysVariable::for_inode(inode_id);
ASSERT(variable.type == SysVariable::Type::String);
auto string_copy = buffer.copy_into_string(size);
if (string_copy.is_null())
return -EFAULT;
{
auto* lockable_string = reinterpret_cast<Lockable<String>*>(variable.address);
LOCKER(lockable_string->lock());
lockable_string->resource() = move(string_copy);
}
variable.notify();
return (ssize_t)size;
}
void ProcFS::add_sys_bool(String&& name, Lockable<bool>& var, Function<void()>&& notify_callback)
{
InterruptDisabler disabler;
SysVariable variable;
variable.name = move(name);
variable.type = SysVariable::Type::Boolean;
variable.notify_callback = move(notify_callback);
variable.address = &var;
sys_variables().append(move(variable));
}
void ProcFS::add_sys_string(String&& name, Lockable<String>& var, Function<void()>&& notify_callback)
{
InterruptDisabler disabler;
SysVariable variable;
variable.name = move(name);
variable.type = SysVariable::Type::String;
variable.notify_callback = move(notify_callback);
variable.address = &var;
sys_variables().append(move(variable));
}
bool ProcFS::initialize()
{
static Lockable<bool>* kmalloc_stack_helper;
if (kmalloc_stack_helper == nullptr) {
kmalloc_stack_helper = new Lockable<bool>();
kmalloc_stack_helper->resource() = g_dump_kmalloc_stacks;
ProcFS::add_sys_bool("kmalloc_stacks", *kmalloc_stack_helper, [] {
g_dump_kmalloc_stacks = kmalloc_stack_helper->resource();
});
}
return true;
}
const char* ProcFS::class_name() const
{
return "ProcFS";
}
NonnullRefPtr<Inode> ProcFS::root_inode() const
{
return *m_root_inode;
}
RefPtr<Inode> ProcFS::get_inode(InodeIdentifier inode_id) const
{
dbgln_if(PROCFS_DEBUG, "ProcFS::get_inode({})", inode_id.index());
if (inode_id == root_inode()->identifier())
return m_root_inode;
LOCKER(m_inodes_lock);
auto it = m_inodes.find(inode_id.index().value());
if (it != m_inodes.end()) {
// It's possible that the ProcFSInode ref count was dropped to 0 or
// the ~ProcFSInode destructor is even running already, but blocked
// from removing it from this map. So we need to *try* to ref it,
// and if that fails we cannot return this instance anymore and just
// create a new one.
if (it->value->try_ref())
return adopt(*it->value);
// We couldn't ref it, so just create a new one and replace the entry
}
auto inode = adopt(*new ProcFSInode(const_cast<ProcFS&>(*this), inode_id.index()));
auto result = m_inodes.set(inode_id.index().value(), inode.ptr());
ASSERT(result == ((it == m_inodes.end()) ? AK::HashSetResult::InsertedNewEntry : AK::HashSetResult::ReplacedExistingEntry));
return inode;
}
ProcFSInode::ProcFSInode(ProcFS& fs, InodeIndex index)
: Inode(fs, index)
{
}
ProcFSInode::~ProcFSInode()
{
LOCKER(fs().m_inodes_lock);
auto it = fs().m_inodes.find(index().value());
if (it != fs().m_inodes.end() && it->value == this)
fs().m_inodes.remove(it);
}
KResult ProcFSInode::refresh_data(FileDescription& description) const
{
if (Kernel::is_directory(identifier()))
return KSuccess;
auto& cached_data = description.data();
auto* directory_entry = fs().get_directory_entry(identifier());
bool (*read_callback)(InodeIdentifier, KBufferBuilder&) = nullptr;
if (directory_entry) {
read_callback = directory_entry->read_callback;
ASSERT(read_callback);
} else {
switch (to_proc_parent_directory(identifier())) {
case PDI_PID_fd:
read_callback = procfs$pid_fd_entry;
break;
case PDI_PID_stacks:
read_callback = procfs$tid_stack;
break;
case PDI_Root_sys:
switch (SysVariable::for_inode(identifier()).type) {
case SysVariable::Type::Invalid:
ASSERT_NOT_REACHED();
case SysVariable::Type::Boolean:
read_callback = read_sys_bool;
break;
case SysVariable::Type::String:
read_callback = read_sys_string;
break;
}
break;
default:
ASSERT_NOT_REACHED();
}
ASSERT(read_callback);
}
if (!cached_data)
cached_data = new ProcFSInodeData;
auto& buffer = static_cast<ProcFSInodeData&>(*cached_data).buffer;
if (buffer) {
// If we're reusing the buffer, reset the size to 0 first. This
// ensures we don't accidentally leak previously written data.
buffer->set_size(0);
}
KBufferBuilder builder(buffer, true);
if (!read_callback(identifier(), builder))
return ENOENT;
// We don't use builder.build() here, which would steal our buffer
// and turn it into an OwnPtr. Instead, just flush to the buffer so
// that we can read all the data that was written.
if (!builder.flush())
return ENOMEM;
if (!buffer)
return ENOMEM;
return KSuccess;
}
KResult ProcFSInode::attach(FileDescription& description)
{
return refresh_data(description);
}
void ProcFSInode::did_seek(FileDescription& description, off_t new_offset)
{
if (new_offset != 0)
return;
auto result = refresh_data(description);
if (result.is_error()) {
// Subsequent calls to read will return EIO!
dbgln("ProcFS: Could not refresh contents: {}", result.error());
}
}
InodeMetadata ProcFSInode::metadata() const
{
dbgln_if(PROCFS_DEBUG, "ProcFSInode::metadata({})", index());
InodeMetadata metadata;
metadata.inode = identifier();
metadata.ctime = mepoch;
metadata.atime = mepoch;
metadata.mtime = mepoch;
auto proc_parent_directory = to_proc_parent_directory(identifier());
auto proc_file_type = to_proc_file_type(identifier());
dbgln_if(PROCFS_DEBUG, " -> pid={}, fi={}, pdi={}", to_pid(identifier()).value(), (int)proc_file_type, (int)proc_parent_directory);
if (is_process_related_file(identifier())) {
ProcessID pid = to_pid(identifier());
auto process = Process::from_pid(pid);
if (process && process->is_dumpable()) {
metadata.uid = process->euid();
metadata.gid = process->egid();
} else {
metadata.uid = 0;
metadata.gid = 0;
}
} else if (is_thread_related_file(identifier())) {
ThreadID tid = to_tid(identifier());
auto thread = Thread::from_tid(tid);
if (thread && thread->process().is_dumpable()) {
metadata.uid = thread->process().euid();
metadata.gid = thread->process().egid();
} else {
metadata.uid = 0;
metadata.gid = 0;
}
}
if (proc_parent_directory == PDI_PID_fd) {
metadata.mode = S_IFLNK | S_IRUSR | S_IWUSR | S_IXUSR;
return metadata;
}
switch (proc_file_type) {
case FI_Root_self:
metadata.mode = S_IFLNK | S_IRUSR | S_IRGRP | S_IROTH;
break;
case FI_PID_cwd:
case FI_PID_exe:
case FI_PID_root:
metadata.mode = S_IFLNK | S_IRUSR;
break;
case FI_Root:
case FI_Root_sys:
case FI_Root_net:
metadata.mode = S_IFDIR | S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
break;
case FI_PID:
case FI_PID_fd:
case FI_PID_stacks:
metadata.mode = S_IFDIR | S_IRUSR | S_IXUSR;
break;
case FI_Root_smbios_entry_point:
metadata.mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
metadata.size = DMIExpose::the().entry_point_length();
break;
case FI_Root_dmi:
metadata.mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
metadata.size = DMIExpose::the().structure_table_length();
break;
default:
metadata.mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
break;
}
if (proc_file_type > FI_Invalid && proc_file_type < FI_MaxStaticFileIndex) {
if (fs().m_entries[proc_file_type].supervisor_only) {
metadata.uid = 0;
metadata.gid = 0;
metadata.mode &= ~077;
}
}
return metadata;
}
ssize_t ProcFSInode::read_bytes(off_t offset, ssize_t count, UserOrKernelBuffer& buffer, FileDescription* description) const
{
dbgln_if(PROCFS_DEBUG, "ProcFS: read_bytes offset: {} count: {}", offset, count);
ASSERT(offset >= 0);
ASSERT(buffer.user_or_kernel_ptr());
if (!description)
return -EIO;
if (!description->data()) {
dbgln_if(PROCFS_DEBUG, "ProcFS: Do not have cached data!");
return -EIO;
}
// Be sure to keep a reference to data_buffer while we use it!
RefPtr<KBufferImpl> data_buffer = static_cast<ProcFSInodeData&>(*description->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 -EFAULT;
return nread;
}
InodeIdentifier ProcFS::ProcFSDirectoryEntry::identifier(unsigned fsid) const
{
return to_identifier(fsid, PDI_Root, 0, (ProcFileType)proc_file_type);
}
KResult ProcFSInode::traverse_as_directory(Function<bool(const FS::DirectoryEntryView&)> callback) const
{
dbgln_if(PROCFS_DEBUG, "ProcFS: traverse_as_directory {}", index());
if (!Kernel::is_directory(identifier()))
return ENOTDIR;
auto proc_file_type = to_proc_file_type(identifier());
auto parent_id = to_parent_id(identifier());
callback({ ".", identifier(), 2 });
callback({ "..", parent_id, 2 });
switch (proc_file_type) {
case FI_Root:
for (auto& entry : fs().m_entries) {
// FIXME: strlen() here is sad.
if (!entry.name)
continue;
if (entry.proc_file_type > __FI_Root_Start && entry.proc_file_type < __FI_Root_End)
callback({ { entry.name, strlen(entry.name) }, to_identifier(fsid(), PDI_Root, 0, (ProcFileType)entry.proc_file_type), 0 });
}
for (auto pid_child : Process::all_pids()) {
char name[16];
size_t name_length = (size_t)snprintf(name, sizeof(name), "%d", pid_child.value());
callback({ { name, name_length }, to_identifier(fsid(), PDI_Root, pid_child, FI_PID), 0 });
}
break;
case FI_Root_sys:
for (size_t i = 1; i < sys_variables().size(); ++i) {
auto& variable = sys_variables()[i];
callback({ variable.name, sys_var_to_identifier(fsid(), i), 0 });
}
break;
case FI_Root_net:
callback({ "adapters", to_identifier(fsid(), PDI_Root_net, 0, FI_Root_net_adapters), 0 });
callback({ "arp", to_identifier(fsid(), PDI_Root_net, 0, FI_Root_net_arp), 0 });
callback({ "tcp", to_identifier(fsid(), PDI_Root_net, 0, FI_Root_net_tcp), 0 });
callback({ "udp", to_identifier(fsid(), PDI_Root_net, 0, FI_Root_net_udp), 0 });
callback({ "local", to_identifier(fsid(), PDI_Root_net, 0, FI_Root_net_local), 0 });
break;
case FI_PID: {
auto pid = to_pid(identifier());
auto process = Process::from_pid(pid);
if (!process)
return ENOENT;
for (auto& entry : fs().m_entries) {
if (entry.proc_file_type > __FI_PID_Start && entry.proc_file_type < __FI_PID_End) {
if (entry.proc_file_type == FI_PID_exe && !process->executable())
continue;
// FIXME: strlen() here is sad.
callback({ { entry.name, strlen(entry.name) }, to_identifier(fsid(), PDI_PID, pid, (ProcFileType)entry.proc_file_type), 0 });
}
}
} break;
case FI_PID_fd: {
auto pid = to_pid(identifier());
auto process = Process::from_pid(pid);
if (!process)
return ENOENT;
for (int i = 0; i < process->max_open_file_descriptors(); ++i) {
auto description = process->file_description(i);
if (!description)
continue;
char name[16];
size_t name_length = (size_t)snprintf(name, sizeof(name), "%d", i);
callback({ { name, name_length }, to_identifier_with_fd(fsid(), pid, i), 0 });
}
} break;
case FI_PID_stacks: {
auto pid = to_pid(identifier());
auto process = Process::from_pid(pid);
if (!process)
return ENOENT;
process->for_each_thread([&](Thread& thread) -> IterationDecision {
int tid = thread.tid().value();
char name[16];
size_t name_length = (size_t)snprintf(name, sizeof(name), "%d", tid);
callback({ { name, name_length }, to_identifier_with_stack(fsid(), tid), 0 });
return IterationDecision::Continue;
});
} break;
default:
return KSuccess;
}
return KSuccess;
}
RefPtr<Inode> ProcFSInode::lookup(StringView name)
{
ASSERT(is_directory());
if (name == ".")
return this;
if (name == "..")
return fs().get_inode(to_parent_id(identifier()));
auto proc_file_type = to_proc_file_type(identifier());
if (proc_file_type == FI_Root) {
for (auto& entry : fs().m_entries) {
if (entry.name == nullptr)
continue;
if (entry.proc_file_type > __FI_Root_Start && entry.proc_file_type < __FI_Root_End) {
if (name == entry.name) {
return fs().get_inode(to_identifier(fsid(), PDI_Root, 0, (ProcFileType)entry.proc_file_type));
}
}
}
auto name_as_number = name.to_uint();
if (!name_as_number.has_value())
return {};
bool process_exists = false;
{
InterruptDisabler disabler;
process_exists = Process::from_pid(name_as_number.value());
}
if (process_exists)
return fs().get_inode(to_identifier(fsid(), PDI_Root, name_as_number.value(), FI_PID));
return {};
}
if (proc_file_type == FI_Root_sys) {
for (size_t i = 1; i < sys_variables().size(); ++i) {
auto& variable = sys_variables()[i];
if (name == variable.name)
return fs().get_inode(sys_var_to_identifier(fsid(), i));
}
return {};
}
if (proc_file_type == FI_Root_net) {
if (name == "adapters")
return fs().get_inode(to_identifier(fsid(), PDI_Root, 0, FI_Root_net_adapters));
if (name == "arp")
return fs().get_inode(to_identifier(fsid(), PDI_Root, 0, FI_Root_net_arp));
if (name == "tcp")
return fs().get_inode(to_identifier(fsid(), PDI_Root, 0, FI_Root_net_tcp));
if (name == "udp")
return fs().get_inode(to_identifier(fsid(), PDI_Root, 0, FI_Root_net_udp));
if (name == "local")
return fs().get_inode(to_identifier(fsid(), PDI_Root, 0, FI_Root_net_local));
return {};
}
if (proc_file_type == FI_PID) {
auto process = Process::from_pid(to_pid(identifier()));
if (!process)
return {};
for (auto& entry : fs().m_entries) {
if (entry.proc_file_type > __FI_PID_Start && entry.proc_file_type < __FI_PID_End) {
if (entry.proc_file_type == FI_PID_exe && !process->executable())
continue;
if (entry.name == nullptr)
continue;
if (name == entry.name) {
return fs().get_inode(to_identifier(fsid(), PDI_PID, to_pid(identifier()), (ProcFileType)entry.proc_file_type));
}
}
}
return {};
}
if (proc_file_type == FI_PID_fd) {
auto name_as_number = name.to_uint();
if (!name_as_number.has_value())
return {};
bool fd_exists = false;
{
if (auto process = Process::from_pid(to_pid(identifier())))
fd_exists = process->file_description(name_as_number.value());
}
if (fd_exists)
return fs().get_inode(to_identifier_with_fd(fsid(), to_pid(identifier()), name_as_number.value()));
}
if (proc_file_type == FI_PID_stacks) {
auto name_as_number = name.to_int();
if (!name_as_number.has_value())
return {};
int tid = name_as_number.value();
if (tid <= 0) {
return {};
}
bool thread_exists = false;
{
auto process = Process::from_pid(to_pid(identifier()));
auto thread = Thread::from_tid(tid);
thread_exists = process && thread && process->pid() == thread->pid();
}
if (thread_exists)
return fs().get_inode(to_identifier_with_stack(fsid(), tid));
}
return {};
}
void ProcFSInode::flush_metadata()
{
}
ssize_t ProcFSInode::write_bytes(off_t offset, ssize_t size, const UserOrKernelBuffer& buffer, FileDescription*)
{
auto result = prepare_to_write_data();
if (result.is_error())
return result;
auto* directory_entry = fs().get_directory_entry(identifier());
ssize_t (*write_callback)(InodeIdentifier, const UserOrKernelBuffer&, size_t) = nullptr;
if (directory_entry == nullptr) {
if (to_proc_parent_directory(identifier()) == PDI_Root_sys) {
switch (SysVariable::for_inode(identifier()).type) {
case SysVariable::Type::Invalid:
ASSERT_NOT_REACHED();
case SysVariable::Type::Boolean:
write_callback = write_sys_bool;
break;
case SysVariable::Type::String:
write_callback = write_sys_string;
break;
}
} else
return -EPERM;
} else {
if (!directory_entry->write_callback)
return -EPERM;
write_callback = directory_entry->write_callback;
}
ASSERT(is_persistent_inode(identifier()));
// FIXME: Being able to write into ProcFS at a non-zero offset seems like something we should maybe support..
ASSERT(offset == 0);
ssize_t nwritten = write_callback(identifier(), buffer, (size_t)size);
if (nwritten < 0)
klog() << "ProcFS: Writing " << size << " bytes failed: " << nwritten;
return nwritten;
}
KResultOr<NonnullRefPtr<Custody>> ProcFSInode::resolve_as_link(Custody& base, RefPtr<Custody>* out_parent, int options, int symlink_recursion_level) const
{
if (FI_Root_self == to_proc_file_type(identifier())) {
return VFS::the().resolve_path(String::number(Process::current()->pid().value()), base, out_parent, options, symlink_recursion_level);
}
// The only other links are in pid directories, so it's safe to ignore
// unrelated files and the thread-specific stacks/ directory.
if (!is_process_related_file(identifier()))
return Inode::resolve_as_link(base, out_parent, options, symlink_recursion_level);
// FIXME: We should return a custody for FI_PID or FI_PID_fd here
// for correctness. It's impossible to create files in ProcFS,
// so returning null shouldn't break much.
if (out_parent)
*out_parent = nullptr;
auto pid = to_pid(identifier());
auto proc_file_type = to_proc_file_type(identifier());
auto process = Process::from_pid(pid);
if (!process)
return ENOENT;
if (to_proc_parent_directory(identifier()) == PDI_PID_fd) {
if (out_parent)
*out_parent = base;
int fd = to_fd(identifier());
auto description = process->file_description(fd);
if (!description)
return ENOENT;
auto proxy_inode = ProcFSProxyInode::create(const_cast<ProcFS&>(fs()), *description);
return Custody::create(&base, "", proxy_inode, base.mount_flags());
}
Custody* res = nullptr;
switch (proc_file_type) {
case FI_PID_cwd:
res = &process->current_directory();
break;
case FI_PID_exe:
res = process->executable();
break;
case FI_PID_root:
// Note: we open root_directory() here, not
// root_directory_relative_to_global_root().
// This seems more useful.
res = &process->root_directory();
break;
default:
ASSERT_NOT_REACHED();
}
if (!res)
return ENOENT;
return *res;
}
ProcFSProxyInode::ProcFSProxyInode(ProcFS& fs, FileDescription& fd)
: Inode(fs, 0)
, m_fd(fd)
{
}
ProcFSProxyInode::~ProcFSProxyInode()
{
}
KResult ProcFSProxyInode::attach(FileDescription& fd)
{
return m_fd->inode()->attach(fd);
}
void ProcFSProxyInode::did_seek(FileDescription& fd, off_t new_offset)
{
return m_fd->inode()->did_seek(fd, new_offset);
}
InodeMetadata ProcFSProxyInode::metadata() const
{
InodeMetadata metadata = m_fd->metadata();
if (m_fd->is_readable())
metadata.mode |= 0444;
else
metadata.mode &= ~0444;
if (m_fd->is_writable())
metadata.mode |= 0222;
else
metadata.mode &= ~0222;
if (!metadata.is_directory())
metadata.mode &= ~0111;
return metadata;
}
KResultOr<NonnullRefPtr<Inode>> ProcFSProxyInode::create_child(const String& name, mode_t mode, dev_t dev, uid_t uid, gid_t gid)
{
if (!m_fd->inode())
return EINVAL;
return m_fd->inode()->create_child(name, mode, dev, uid, gid);
}
KResult ProcFSProxyInode::add_child(Inode& child, const StringView& name, mode_t mode)
{
if (!m_fd->inode())
return EINVAL;
return m_fd->inode()->add_child(child, name, mode);
}
KResult ProcFSProxyInode::remove_child(const StringView& name)
{
if (!m_fd->inode())
return EINVAL;
return m_fd->inode()->remove_child(name);
}
RefPtr<Inode> ProcFSProxyInode::lookup(StringView name)
{
if (!m_fd->inode())
return {};
return m_fd->inode()->lookup(name);
}
KResultOr<size_t> ProcFSProxyInode::directory_entry_count() const
{
if (!m_fd->inode())
return EINVAL;
return m_fd->inode()->directory_entry_count();
}
KResultOr<NonnullRefPtr<Inode>> ProcFSInode::create_child(const String&, mode_t, dev_t, uid_t, gid_t)
{
return EPERM;
}
KResult ProcFSInode::add_child(Inode&, const StringView&, mode_t)
{
return EPERM;
}
KResult ProcFSInode::remove_child([[maybe_unused]] const StringView& name)
{
return EPERM;
}
KResultOr<size_t> ProcFSInode::directory_entry_count() const
{
ASSERT(is_directory());
size_t count = 0;
KResult result = traverse_as_directory([&count](auto&) {
++count;
return true;
});
if (result.is_error())
return result;
return count;
}
KResult ProcFSInode::chmod(mode_t)
{
return EPERM;
}
ProcFS::ProcFS()
{
m_root_inode = adopt(*new ProcFSInode(*this, 1));
m_entries.resize(FI_MaxStaticFileIndex);
m_entries[FI_Root_df] = { "df", FI_Root_df, false, procfs$df };
m_entries[FI_Root_all] = { "all", FI_Root_all, false, procfs$all };
m_entries[FI_Root_memstat] = { "memstat", FI_Root_memstat, false, procfs$memstat };
m_entries[FI_Root_cpuinfo] = { "cpuinfo", FI_Root_cpuinfo, false, procfs$cpuinfo };
m_entries[FI_Root_dmesg] = { "dmesg", FI_Root_dmesg, true, procfs$dmesg };
m_entries[FI_Root_self] = { "self", FI_Root_self, false, procfs$self };
m_entries[FI_Root_pci] = { "pci", FI_Root_pci, false, procfs$pci };
m_entries[FI_Root_interrupts] = { "interrupts", FI_Root_interrupts, false, procfs$interrupts };
m_entries[FI_Root_dmi] = { "DMI", FI_Root_dmi, false, procfs$dmi };
m_entries[FI_Root_smbios_entry_point] = { "smbios_entry_point", FI_Root_smbios_entry_point, false, procfs$smbios_entry_point };
m_entries[FI_Root_keymap] = { "keymap", FI_Root_keymap, false, procfs$keymap };
m_entries[FI_Root_devices] = { "devices", FI_Root_devices, false, procfs$devices };
m_entries[FI_Root_uptime] = { "uptime", FI_Root_uptime, false, procfs$uptime };
m_entries[FI_Root_cmdline] = { "cmdline", FI_Root_cmdline, true, procfs$cmdline };
m_entries[FI_Root_modules] = { "modules", FI_Root_modules, true, procfs$modules };
m_entries[FI_Root_sys] = { "sys", FI_Root_sys, true };
m_entries[FI_Root_net] = { "net", FI_Root_net, false };
m_entries[FI_Root_net_adapters] = { "adapters", FI_Root_net_adapters, false, procfs$net_adapters };
m_entries[FI_Root_net_arp] = { "arp", FI_Root_net_arp, true, procfs$net_arp };
m_entries[FI_Root_net_tcp] = { "tcp", FI_Root_net_tcp, false, procfs$net_tcp };
m_entries[FI_Root_net_udp] = { "udp", FI_Root_net_udp, false, procfs$net_udp };
m_entries[FI_Root_net_local] = { "local", FI_Root_net_local, false, procfs$net_local };
m_entries[FI_PID_vm] = { "vm", FI_PID_vm, false, procfs$pid_vm };
m_entries[FI_PID_stacks] = { "stacks", FI_PID_stacks, false };
m_entries[FI_PID_fds] = { "fds", FI_PID_fds, false, procfs$pid_fds };
m_entries[FI_PID_exe] = { "exe", FI_PID_exe, false, procfs$pid_exe };
m_entries[FI_PID_cwd] = { "cwd", FI_PID_cwd, false, procfs$pid_cwd };
m_entries[FI_PID_unveil] = { "unveil", FI_PID_unveil, false, procfs$pid_unveil };
m_entries[FI_PID_root] = { "root", FI_PID_root, false, procfs$pid_root };
m_entries[FI_PID_perf_events] = { "perf_events", FI_PID_perf_events, false, procfs$pid_perf_events };
m_entries[FI_PID_fd] = { "fd", FI_PID_fd, false };
}
ProcFS::ProcFSDirectoryEntry* ProcFS::get_directory_entry(InodeIdentifier identifier) const
{
auto proc_file_type = to_proc_file_type(identifier);
if (proc_file_type != FI_Invalid && proc_file_type != FI_Root_sys_variable && proc_file_type < FI_MaxStaticFileIndex)
return const_cast<ProcFSDirectoryEntry*>(&m_entries[proc_file_type]);
return nullptr;
}
KResult ProcFSInode::chown(uid_t, gid_t)
{
return EPERM;
}
}
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