forked from Bananymous/banan-os
1045 lines
29 KiB
C++
1045 lines
29 KiB
C++
#include <BAN/ScopeGuard.h>
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#include <BAN/StringView.h>
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#include <kernel/CriticalScope.h>
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#include <kernel/FS/VirtualFileSystem.h>
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#include <kernel/LockGuard.h>
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#include <kernel/Memory/Heap.h>
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#include <kernel/Memory/PageTableScope.h>
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#include <kernel/Process.h>
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#include <kernel/Scheduler.h>
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#include <kernel/Signal.h>
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#include <LibELF/ELF.h>
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#include <LibELF/Values.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/sysmacros.h>
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namespace Kernel
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{
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static BAN::Vector<Process*> s_processes;
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static SpinLock s_process_lock;
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Process* Process::create_process(const Credentials& credentials)
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{
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static pid_t s_next_pid = 1;
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auto* process = new Process(credentials, s_next_pid++);
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ASSERT(process);
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return process;
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}
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void Process::register_process(Process* process)
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{
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s_process_lock.lock();
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MUST(s_processes.push_back(process));
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s_process_lock.unlock();
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for (auto* thread : process->m_threads)
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MUST(Scheduler::get().add_thread(thread));
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}
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Process* Process::create_kernel(entry_t entry, void* data)
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{
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auto* process = create_process({ 0, 0, 0, 0 });
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MUST(process->m_working_directory.push_back('/'));
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auto* thread = MUST(Thread::create_kernel(entry, data, process));
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process->add_thread(thread);
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register_process(process);
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return process;
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}
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BAN::ErrorOr<Process*> Process::create_userspace(const Credentials& credentials, BAN::StringView path)
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{
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auto elf = TRY(load_elf_for_exec(credentials, path, "/"sv, {}));
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auto* process = create_process(credentials);
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MUST(process->m_working_directory.push_back('/'));
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process->m_page_table = BAN::UniqPtr<PageTable>::adopt(MUST(PageTable::create_userspace()));;
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process->load_elf_to_memory(*elf);
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process->m_userspace_info.entry = elf->file_header_native().e_entry;
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// NOTE: we clear the elf since we don't need the memory anymore
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elf.clear();
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char** argv = nullptr;
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char** envp = nullptr;
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{
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PageTableScope _(process->page_table());
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argv = (char**)MUST(process->sys_alloc(sizeof(char**) * 2));
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argv[0] = (char*)MUST(process->sys_alloc(path.size() + 1));
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memcpy(argv[0], path.data(), path.size());
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argv[0][path.size()] = '\0';
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argv[1] = nullptr;
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BAN::StringView env1 = "PATH=/bin:/usr/bin"sv;
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envp = (char**)MUST(process->sys_alloc(sizeof(char**) * 2));
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envp[0] = (char*)MUST(process->sys_alloc(env1.size() + 1));
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memcpy(envp[0], env1.data(), env1.size());
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envp[0][env1.size()] = '\0';
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envp[1] = nullptr;
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}
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process->m_userspace_info.argc = 1;
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process->m_userspace_info.argv = argv;
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process->m_userspace_info.envp = envp;
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auto* thread = MUST(Thread::create_userspace(process));
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process->add_thread(thread);
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register_process(process);
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return process;
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}
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Process::Process(const Credentials& credentials, pid_t pid)
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: m_credentials(credentials)
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, m_open_file_descriptors(m_credentials)
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, m_pid(pid)
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, m_tty(TTY::current())
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{
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for (size_t i = 0; i < sizeof(m_signal_handlers) / sizeof(*m_signal_handlers); i++)
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m_signal_handlers[i] = (vaddr_t)SIG_DFL;
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}
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Process::~Process()
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{
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ASSERT(m_threads.empty());
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ASSERT(m_fixed_width_allocators.empty());
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ASSERT(!m_general_allocator);
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ASSERT(m_mapped_ranges.empty());
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ASSERT(&PageTable::current() != m_page_table.ptr());
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}
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void Process::add_thread(Thread* thread)
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{
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LockGuard _(m_lock);
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MUST(m_threads.push_back(thread));
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}
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void Process::on_thread_exit(Thread& thread)
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{
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LockGuard _(m_lock);
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for (size_t i = 0; i < m_threads.size(); i++)
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if (m_threads[i] == &thread)
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m_threads.remove(i);
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if (m_threads.empty())
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exit(0);
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}
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void Process::exit(int status)
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{
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m_lock.lock();
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m_exit_status.exit_code = status;
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m_exit_status.exited = true;
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while (m_exit_status.waiting > 0)
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{
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m_exit_status.semaphore.unblock();
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m_lock.unlock();
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Scheduler::get().reschedule();
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m_lock.lock();
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}
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m_threads.clear();
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m_open_file_descriptors.close_all();
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// NOTE: We must unmap ranges while the page table is still alive
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m_mapped_ranges.clear();
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// NOTE: We must clear allocators while the page table is still alive
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m_fixed_width_allocators.clear();
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m_general_allocator.clear();
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s_process_lock.lock();
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for (size_t i = 0; i < s_processes.size(); i++)
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if (s_processes[i] == this)
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s_processes.remove(i);
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s_process_lock.unlock();
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// FIXME: we can't assume this is the current process
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ASSERT(&Process::current() == this);
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Scheduler::get().set_current_process_done();
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}
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BAN::ErrorOr<long> Process::sys_exit(int status)
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{
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exit(status);
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ASSERT_NOT_REACHED();
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}
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BAN::ErrorOr<long> Process::sys_gettermios(::termios* termios)
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{
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LockGuard _(m_lock);
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if (!m_tty)
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return BAN::Error::from_errno(ENOTTY);
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Kernel::termios ktermios = m_tty->get_termios();
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termios->c_lflag = 0;
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if (ktermios.canonical)
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termios->c_lflag |= ICANON;
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if (ktermios.echo)
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termios->c_lflag |= ECHO;
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return 0;
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}
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BAN::ErrorOr<long> Process::sys_settermios(const ::termios* termios)
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{
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LockGuard _(m_lock);
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if (!m_tty)
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return BAN::Error::from_errno(ENOTTY);
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Kernel::termios ktermios;
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ktermios.echo = termios->c_lflag & ECHO;
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ktermios.canonical = termios->c_lflag & ICANON;
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m_tty->set_termios(ktermios);
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return 0;
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}
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BAN::ErrorOr<BAN::UniqPtr<LibELF::ELF>> Process::load_elf_for_exec(const Credentials& credentials, BAN::StringView file_path, const BAN::String& cwd, const BAN::Vector<BAN::StringView>& path_env)
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{
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if (file_path.empty())
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return BAN::Error::from_errno(ENOENT);
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BAN::String absolute_path;
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if (file_path.front() == '/')
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{
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// We have an absolute path
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TRY(absolute_path.append(file_path));
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}
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else if (file_path.front() == '.' || file_path.contains('/'))
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{
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// We have a relative path
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TRY(absolute_path.append(cwd));
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TRY(absolute_path.push_back('/'));
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TRY(absolute_path.append(file_path));
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}
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else
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{
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// We have neither relative or absolute path,
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// search from PATH environment
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for (auto path_part : path_env)
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{
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if (path_part.empty())
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continue;
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if (path_part.front() != '/')
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{
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TRY(absolute_path.append(cwd));
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TRY(absolute_path.push_back('/'));
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}
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TRY(absolute_path.append(path_part));
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TRY(absolute_path.push_back('/'));
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TRY(absolute_path.append(file_path));
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if (!VirtualFileSystem::get().file_from_absolute_path(credentials, absolute_path, O_EXEC).is_error())
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break;
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absolute_path.clear();
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}
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if (absolute_path.empty())
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return BAN::Error::from_errno(ENOENT);
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}
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auto file = TRY(VirtualFileSystem::get().file_from_absolute_path(credentials, absolute_path, O_EXEC));
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auto elf_or_error = LibELF::ELF::load_from_file(file.inode);
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if (elf_or_error.is_error())
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{
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if (elf_or_error.error().get_error_code() == EINVAL)
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return BAN::Error::from_errno(ENOEXEC);
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return elf_or_error.error();
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}
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auto elf = elf_or_error.release_value();
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if (!elf->is_native())
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{
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derrorln("ELF has invalid architecture");
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return BAN::Error::from_errno(EINVAL);
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}
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if (elf->file_header_native().e_type != LibELF::ET_EXEC)
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{
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derrorln("Not an executable");
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return BAN::Error::from_errno(ENOEXEC);
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}
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return BAN::move(elf);
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}
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BAN::ErrorOr<long> Process::sys_fork(uintptr_t rsp, uintptr_t rip)
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{
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auto page_table = BAN::UniqPtr<PageTable>::adopt(TRY(PageTable::create_userspace()));
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LockGuard _(m_lock);
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BAN::String working_directory;
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TRY(working_directory.append(m_working_directory));
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OpenFileDescriptorSet open_file_descriptors(m_credentials);
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TRY(open_file_descriptors.clone_from(m_open_file_descriptors));
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BAN::Vector<BAN::UniqPtr<VirtualRange>> mapped_ranges;
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TRY(mapped_ranges.reserve(m_mapped_ranges.size()));
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for (auto& mapped_range : m_mapped_ranges)
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MUST(mapped_ranges.push_back(TRY(mapped_range->clone(*page_table))));
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BAN::Vector<BAN::UniqPtr<FixedWidthAllocator>> fixed_width_allocators;
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TRY(fixed_width_allocators.reserve(m_fixed_width_allocators.size()));
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for (auto& allocator : m_fixed_width_allocators)
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if (allocator->allocations() > 0)
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MUST(fixed_width_allocators.push_back(TRY(allocator->clone(*page_table))));
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BAN::UniqPtr<GeneralAllocator> general_allocator;
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if (m_general_allocator)
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general_allocator = TRY(m_general_allocator->clone(*page_table));
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Process* forked = create_process(m_credentials);
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forked->m_tty = m_tty;
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forked->m_working_directory = BAN::move(working_directory);
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forked->m_page_table = BAN::move(page_table);
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forked->m_open_file_descriptors = BAN::move(open_file_descriptors);
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forked->m_mapped_ranges = BAN::move(mapped_ranges);
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forked->m_fixed_width_allocators = BAN::move(fixed_width_allocators);
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forked->m_general_allocator = BAN::move(general_allocator);
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forked->m_userspace_info = m_userspace_info;
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memcpy(forked->m_signal_handlers, m_signal_handlers, sizeof(m_signal_handlers));
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ASSERT(this == &Process::current());
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// FIXME: this should be able to fail
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Thread* thread = MUST(Thread::current().clone(forked, rsp, rip));
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forked->add_thread(thread);
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register_process(forked);
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return forked->pid();
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}
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BAN::ErrorOr<long> Process::sys_exec(BAN::StringView path, const char* const* argv, const char* const* envp)
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{
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// NOTE: We scope everything for automatic deletion
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{
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BAN::Vector<BAN::String> str_argv;
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for (int i = 0; argv && argv[i]; i++)
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TRY(str_argv.emplace_back(argv[i]));
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BAN::Vector<BAN::StringView> path_env;
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BAN::Vector<BAN::String> str_envp;
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for (int i = 0; envp && envp[i]; i++)
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{
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TRY(str_envp.emplace_back(envp[i]));
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if (strncmp(envp[i], "PATH=", 5) == 0)
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path_env = TRY(BAN::StringView(envp[i]).substring(5).split(':'));
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}
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BAN::String working_directory;
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{
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LockGuard _(m_lock);
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TRY(working_directory.append(m_working_directory));
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}
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auto elf = TRY(load_elf_for_exec(m_credentials, path, working_directory, path_env));
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LockGuard lock_guard(m_lock);
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m_open_file_descriptors.close_cloexec();
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m_fixed_width_allocators.clear();
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m_general_allocator.clear();
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m_mapped_ranges.clear();
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load_elf_to_memory(*elf);
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m_userspace_info.entry = elf->file_header_native().e_entry;
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for (size_t i = 0; i < sizeof(m_signal_handlers) / sizeof(*m_signal_handlers); i++)
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m_signal_handlers[i] = (vaddr_t)SIG_DFL;
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// NOTE: we clear the elf since we don't need the memory anymore
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elf.clear();
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ASSERT(m_threads.size() == 1);
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ASSERT(&Process::current() == this);
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// allocate memory on the new process for arguments and environment
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{
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LockGuard _(page_table());
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m_userspace_info.argv = (char**)MUST(sys_alloc(sizeof(char**) * (str_argv.size() + 1)));
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for (size_t i = 0; i < str_argv.size(); i++)
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{
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m_userspace_info.argv[i] = (char*)MUST(sys_alloc(str_argv[i].size() + 1));
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memcpy(m_userspace_info.argv[i], str_argv[i].data(), str_argv[i].size());
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m_userspace_info.argv[i][str_argv[i].size()] = '\0';
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}
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m_userspace_info.argv[str_argv.size()] = nullptr;
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m_userspace_info.envp = (char**)MUST(sys_alloc(sizeof(char**) * (str_envp.size() + 1)));
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for (size_t i = 0; i < str_envp.size(); i++)
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{
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m_userspace_info.envp[i] = (char*)MUST(sys_alloc(str_envp[i].size() + 1));
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memcpy(m_userspace_info.envp[i], str_envp[i].data(), str_envp[i].size());
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m_userspace_info.envp[i][str_envp[i].size()] = '\0';
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}
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m_userspace_info.envp[str_envp.size()] = nullptr;
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}
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m_userspace_info.argc = str_argv.size();
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asm volatile("cli");
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m_threads.front()->setup_exec();
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}
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Scheduler::get().execute_current_thread();
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ASSERT_NOT_REACHED();
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}
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int Process::block_until_exit()
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{
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ASSERT(s_process_lock.is_locked());
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ASSERT(this != &Process::current());
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s_process_lock.unlock();
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m_lock.lock();
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m_exit_status.waiting++;
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while (!m_exit_status.exited)
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{
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m_lock.unlock();
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m_exit_status.semaphore.block();
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m_lock.lock();
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}
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int ret = m_exit_status.exit_code;
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m_exit_status.waiting--;
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m_lock.unlock();
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s_process_lock.lock();
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return ret;
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}
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BAN::ErrorOr<long> Process::sys_wait(pid_t pid, int* stat_loc, int options)
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{
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Process* target = nullptr;
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// FIXME: support options
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if (options)
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return BAN::Error::from_errno(EINVAL);
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LockGuard _(s_process_lock);
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for (auto* process : s_processes)
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if (process->pid() == pid)
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target = process;
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if (target == nullptr)
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return BAN::Error::from_errno(ECHILD);
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pid_t ret = target->pid();
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*stat_loc = target->block_until_exit();
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return ret;
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}
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BAN::ErrorOr<long> Process::sys_sleep(int seconds)
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{
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PIT::sleep(seconds * 1000);
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return 0;
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}
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BAN::ErrorOr<long> Process::sys_setenvp(char** envp)
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{
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LockGuard _(m_lock);
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m_userspace_info.envp = envp;
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return 0;
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}
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void Process::load_elf_to_memory(LibELF::ELF& elf)
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{
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ASSERT(elf.is_native());
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auto& elf_file_header = elf.file_header_native();
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for (size_t i = 0; i < elf_file_header.e_phnum; i++)
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{
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auto& elf_program_header = elf.program_header_native(i);
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switch (elf_program_header.p_type)
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{
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case LibELF::PT_NULL:
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break;
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case LibELF::PT_LOAD:
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{
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uint8_t flags = PageTable::Flags::UserSupervisor | PageTable::Flags::Present;
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if (elf_program_header.p_flags & LibELF::PF_W)
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flags |= PageTable::Flags::ReadWrite;
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if (elf_program_header.p_flags & LibELF::PF_X)
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flags |= PageTable::Flags::Execute;
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size_t page_start = elf_program_header.p_vaddr / PAGE_SIZE;
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size_t page_end = BAN::Math::div_round_up<size_t>(elf_program_header.p_vaddr + elf_program_header.p_memsz, PAGE_SIZE);
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size_t page_count = page_end - page_start;
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page_table().lock();
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if (!page_table().is_range_free(page_start * PAGE_SIZE, page_count * PAGE_SIZE))
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{
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page_table().debug_dump();
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Kernel::panic("vaddr {8H}-{8H} not free {8H}-{8H}",
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page_start * PAGE_SIZE,
|
|
page_start * PAGE_SIZE + page_count * PAGE_SIZE
|
|
);
|
|
}
|
|
|
|
{
|
|
LockGuard _(m_lock);
|
|
MUST(m_mapped_ranges.push_back(MUST(VirtualRange::create(page_table(), page_start * PAGE_SIZE, page_count * PAGE_SIZE, flags))));
|
|
m_mapped_ranges.back()->set_zero();
|
|
m_mapped_ranges.back()->copy_from(elf_program_header.p_vaddr % PAGE_SIZE, elf.data() + elf_program_header.p_offset, elf_program_header.p_filesz);
|
|
}
|
|
|
|
page_table().unlock();
|
|
|
|
break;
|
|
}
|
|
default:
|
|
ASSERT_NOT_REACHED();
|
|
}
|
|
}
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_open(BAN::StringView path, int flags, mode_t mode)
|
|
{
|
|
LockGuard _(m_lock);
|
|
BAN::String absolute_path = TRY(absolute_path_of(path));
|
|
|
|
if (flags & O_CREAT)
|
|
{
|
|
auto file_or_error = VirtualFileSystem::get().file_from_absolute_path(m_credentials, absolute_path, O_WRONLY);
|
|
if (file_or_error.is_error())
|
|
{
|
|
if (file_or_error.error().get_error_code() == ENOENT)
|
|
TRY(sys_creat(path, mode));
|
|
else
|
|
return file_or_error.release_error();
|
|
}
|
|
flags &= ~O_CREAT;
|
|
}
|
|
|
|
return TRY(m_open_file_descriptors.open(absolute_path, flags));
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_openat(int fd, BAN::StringView path, int flags, mode_t mode)
|
|
{
|
|
LockGuard _(m_lock);
|
|
|
|
BAN::String absolute_path;
|
|
TRY(absolute_path.append(TRY(m_open_file_descriptors.path_of(fd))));
|
|
TRY(absolute_path.push_back('/'));
|
|
TRY(absolute_path.append(path));
|
|
|
|
return sys_open(absolute_path, flags, mode);
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_close(int fd)
|
|
{
|
|
LockGuard _(m_lock);
|
|
TRY(m_open_file_descriptors.close(fd));
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_read(int fd, void* buffer, size_t count)
|
|
{
|
|
LockGuard _(m_lock);
|
|
return TRY(m_open_file_descriptors.read(fd, buffer, count));
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_write(int fd, const void* buffer, size_t count)
|
|
{
|
|
LockGuard _(m_lock);
|
|
return TRY(m_open_file_descriptors.write(fd, buffer, count));
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_pipe(int fildes[2])
|
|
{
|
|
LockGuard _(m_lock);
|
|
TRY(m_open_file_descriptors.pipe(fildes));
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_dup2(int fildes, int fildes2)
|
|
{
|
|
LockGuard _(m_lock);
|
|
return TRY(m_open_file_descriptors.dup2(fildes, fildes2));
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_seek(int fd, off_t offset, int whence)
|
|
{
|
|
LockGuard _(m_lock);
|
|
TRY(m_open_file_descriptors.seek(fd, offset, whence));
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_tell(int fd)
|
|
{
|
|
LockGuard _(m_lock);
|
|
return TRY(m_open_file_descriptors.tell(fd));
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_creat(BAN::StringView path, mode_t mode)
|
|
{
|
|
if ((mode & 0777) != mode)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
LockGuard _(m_lock);
|
|
|
|
auto absolute_path = TRY(absolute_path_of(path));
|
|
|
|
size_t index;
|
|
for (index = absolute_path.size(); index > 0; index--)
|
|
if (absolute_path[index - 1] == '/')
|
|
break;
|
|
|
|
auto directory = absolute_path.sv().substring(0, index);
|
|
auto file_name = absolute_path.sv().substring(index);
|
|
|
|
auto parent_file = TRY(VirtualFileSystem::get().file_from_absolute_path(m_credentials, directory, O_WRONLY));
|
|
TRY(parent_file.inode->create_file(file_name, S_IFREG | mode, m_credentials.euid(), m_credentials.egid()));
|
|
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<void> Process::mount(BAN::StringView source, BAN::StringView target)
|
|
{
|
|
BAN::String absolute_source, absolute_target;
|
|
{
|
|
LockGuard _(m_lock);
|
|
TRY(absolute_source.append(TRY(absolute_path_of(source))));
|
|
TRY(absolute_target.append(TRY(absolute_path_of(target))));
|
|
}
|
|
TRY(VirtualFileSystem::get().mount(m_credentials, absolute_source, absolute_target));
|
|
return {};
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_fstat(int fd, struct stat* out)
|
|
{
|
|
LockGuard _(m_lock);
|
|
TRY(m_open_file_descriptors.fstat(fd, out));
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_stat(BAN::StringView path, struct stat* out, int flags)
|
|
{
|
|
LockGuard _(m_lock);
|
|
int fd = TRY(sys_open(path, flags));
|
|
auto ret = sys_fstat(fd, out);
|
|
MUST(sys_close(fd));
|
|
return ret;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_read_dir_entries(int fd, DirectoryEntryList* list, size_t list_size)
|
|
{
|
|
LockGuard _(m_lock);
|
|
TRY(m_open_file_descriptors.read_dir_entries(fd, list, list_size));
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_setpwd(const char* path)
|
|
{
|
|
BAN::String absolute_path;
|
|
|
|
{
|
|
LockGuard _(m_lock);
|
|
absolute_path = TRY(absolute_path_of(path));
|
|
}
|
|
|
|
auto file = TRY(VirtualFileSystem::get().file_from_absolute_path(m_credentials, absolute_path, O_SEARCH));
|
|
if (!file.inode->mode().ifdir())
|
|
return BAN::Error::from_errno(ENOTDIR);
|
|
|
|
LockGuard _(m_lock);
|
|
m_working_directory = BAN::move(file.canonical_path);
|
|
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_getpwd(char* buffer, size_t size)
|
|
{
|
|
LockGuard _(m_lock);
|
|
|
|
if (size < m_working_directory.size() + 1)
|
|
return BAN::Error::from_errno(ERANGE);
|
|
|
|
memcpy(buffer, m_working_directory.data(), m_working_directory.size());
|
|
buffer[m_working_directory.size()] = '\0';
|
|
|
|
return (long)buffer;
|
|
}
|
|
|
|
static constexpr size_t allocator_size_for_allocation(size_t value)
|
|
{
|
|
if (value <= 256) {
|
|
if (value <= 64)
|
|
return 64;
|
|
else
|
|
return 256;
|
|
} else {
|
|
if (value <= 1024)
|
|
return 1024;
|
|
else
|
|
return 4096;
|
|
}
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_alloc(size_t bytes)
|
|
{
|
|
vaddr_t address = 0;
|
|
|
|
if (bytes <= PAGE_SIZE)
|
|
{
|
|
// Do fixed width allocation
|
|
size_t allocation_size = allocator_size_for_allocation(bytes);
|
|
ASSERT(bytes <= allocation_size);
|
|
ASSERT(allocation_size <= PAGE_SIZE);
|
|
|
|
LockGuard _(m_lock);
|
|
|
|
bool needs_new_allocator { true };
|
|
|
|
for (auto& allocator : m_fixed_width_allocators)
|
|
{
|
|
if (allocator->allocation_size() == allocation_size && allocator->allocations() < allocator->max_allocations())
|
|
{
|
|
address = allocator->allocate();
|
|
needs_new_allocator = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (needs_new_allocator)
|
|
{
|
|
auto allocator = TRY(FixedWidthAllocator::create(page_table(), allocation_size));
|
|
TRY(m_fixed_width_allocators.push_back(BAN::move(allocator)));
|
|
address = m_fixed_width_allocators.back()->allocate();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
LockGuard _(m_lock);
|
|
|
|
if (!m_general_allocator)
|
|
m_general_allocator = TRY(GeneralAllocator::create(page_table(), 0x400000));
|
|
|
|
address = m_general_allocator->allocate(bytes);
|
|
}
|
|
|
|
if (address == 0)
|
|
return BAN::Error::from_errno(ENOMEM);
|
|
return address;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_free(void* ptr)
|
|
{
|
|
LockGuard _(m_lock);
|
|
|
|
for (size_t i = 0; i < m_fixed_width_allocators.size(); i++)
|
|
{
|
|
auto& allocator = m_fixed_width_allocators[i];
|
|
if (allocator->deallocate((vaddr_t)ptr))
|
|
{
|
|
// TODO: This might be too much. Maybe we should only
|
|
// remove allocators when we have low memory... ?
|
|
if (allocator->allocations() == 0)
|
|
m_fixed_width_allocators.remove(i);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (m_general_allocator && m_general_allocator->deallocate((vaddr_t)ptr))
|
|
return 0;
|
|
|
|
dwarnln("free called on pointer that was not allocated");
|
|
return BAN::Error::from_errno(EINVAL);
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_termid(char* buffer) const
|
|
{
|
|
LockGuard _(m_lock);
|
|
if (!m_tty)
|
|
buffer[0] = '\0';
|
|
else
|
|
{
|
|
ASSERT(minor(m_tty->rdev()) < 10);
|
|
strcpy(buffer, "/dev/tty0");
|
|
buffer[8] += minor(m_tty->rdev());
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_clock_gettime(clockid_t clock_id, timespec* tp) const
|
|
{
|
|
switch (clock_id)
|
|
{
|
|
case CLOCK_MONOTONIC:
|
|
{
|
|
uint64_t time_ms = PIT::ms_since_boot();
|
|
tp->tv_sec = time_ms / 1000;
|
|
tp->tv_nsec = (time_ms % 1000) * 1000000;
|
|
break;
|
|
}
|
|
default:
|
|
return BAN::Error::from_errno(ENOTSUP);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_signal(int signal, void (*handler)(int))
|
|
{
|
|
if (signal < _SIGMIN || signal > _SIGMAX)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
CriticalScope _;
|
|
m_signal_handlers[signal] = (vaddr_t)handler;
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_kill(pid_t pid, int signal, uintptr_t& return_rsp, uintptr_t& return_rip)
|
|
{
|
|
if (pid <= 0)
|
|
return BAN::Error::from_errno(ENOTSUP);
|
|
if (signal != 0 && (signal < _SIGMIN || signal > _SIGMAX))
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
if (pid == this->pid())
|
|
return sys_raise(signal, return_rsp, return_rip);
|
|
|
|
LockGuard process_guard(s_process_lock);
|
|
CriticalScope _;
|
|
for (auto* process : s_processes)
|
|
{
|
|
if (process->pid() == pid)
|
|
{
|
|
if (signal)
|
|
process->m_threads.front()->m_signal_queue.push(signal);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return BAN::Error::from_errno(ESRCH);
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_raise(int signal, uintptr_t& return_rsp, uintptr_t& return_rip)
|
|
{
|
|
if (signal < _SIGMIN || signal > _SIGMAX)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
ASSERT(m_threads.size() == 1);
|
|
CriticalScope _;
|
|
Thread::current().m_signal_queue.push(signal);
|
|
Thread::current().handle_signal(signal, return_rsp, return_rip);
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_setuid(uid_t uid)
|
|
{
|
|
if (uid < 0 || uid >= 1'000'000'000)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
LockGuard _(m_lock);
|
|
|
|
// If the process has appropriate privileges, setuid() shall set the real user ID, effective user ID, and the saved
|
|
// set-user-ID of the calling process to uid.
|
|
if (m_credentials.is_superuser())
|
|
{
|
|
m_credentials.set_euid(uid);
|
|
m_credentials.set_ruid(uid);
|
|
m_credentials.set_suid(uid);
|
|
return 0;
|
|
}
|
|
|
|
// If the process does not have appropriate privileges, but uid is equal to the real user ID or the saved set-user-ID,
|
|
// setuid() shall set the effective user ID to uid; the real user ID and saved set-user-ID shall remain unchanged.
|
|
if (uid == m_credentials.ruid() || uid == m_credentials.suid())
|
|
{
|
|
m_credentials.set_euid(uid);
|
|
return 0;
|
|
}
|
|
|
|
return BAN::Error::from_errno(EPERM);
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_setgid(gid_t gid)
|
|
{
|
|
if (gid < 0 || gid >= 1'000'000'000)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
LockGuard _(m_lock);
|
|
|
|
// If the process has appropriate privileges, setgid() shall set the real group ID, effective group ID, and the saved
|
|
// set-group-ID of the calling process to gid.
|
|
if (m_credentials.is_superuser())
|
|
{
|
|
m_credentials.set_egid(gid);
|
|
m_credentials.set_rgid(gid);
|
|
m_credentials.set_sgid(gid);
|
|
return 0;
|
|
}
|
|
|
|
// If the process does not have appropriate privileges, but gid is equal to the real group ID or the saved set-group-ID,
|
|
// setgid() shall set the effective group ID to gid; the real group ID and saved set-group-ID shall remain unchanged.
|
|
if (gid == m_credentials.rgid() || gid == m_credentials.sgid())
|
|
{
|
|
m_credentials.set_egid(gid);
|
|
return 0;
|
|
}
|
|
|
|
return BAN::Error::from_errno(EPERM);
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_seteuid(uid_t uid)
|
|
{
|
|
if (uid < 0 || uid >= 1'000'000'000)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
LockGuard _(m_lock);
|
|
|
|
// If uid is equal to the real user ID or the saved set-user-ID, or if the process has appropriate privileges, seteuid()
|
|
// shall set the effective user ID of the calling process to uid; the real user ID and saved set-user-ID shall remain unchanged.
|
|
if (uid == m_credentials.ruid() || uid == m_credentials.suid() || m_credentials.is_superuser())
|
|
{
|
|
m_credentials.set_euid(uid);
|
|
return 0;
|
|
}
|
|
|
|
return BAN::Error::from_errno(EPERM);
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_setegid(gid_t gid)
|
|
{
|
|
if (gid < 0 || gid >= 1'000'000'000)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
LockGuard _(m_lock);
|
|
|
|
// If gid is equal to the real group ID or the saved set-group-ID, or if the process has appropriate privileges, setegid()
|
|
// shall set the effective group ID of the calling process to gid; the real group ID, saved set-group-ID, and any
|
|
// supplementary group IDs shall remain unchanged.
|
|
if (gid == m_credentials.rgid() || gid == m_credentials.sgid() || m_credentials.is_superuser())
|
|
{
|
|
m_credentials.set_egid(gid);
|
|
return 0;
|
|
}
|
|
|
|
return BAN::Error::from_errno(EPERM);
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_setreuid(uid_t ruid, uid_t euid)
|
|
{
|
|
if (ruid == -1 && euid == -1)
|
|
return 0;
|
|
|
|
if (ruid < -1 || ruid >= 1'000'000'000)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
if (euid < -1 || euid >= 1'000'000'000)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
// The setreuid() function shall set the real and effective user IDs of the current process to the values specified
|
|
// by the ruid and euid arguments. If ruid or euid is -1, the corresponding effective or real user ID of the current
|
|
// process shall be left unchanged.
|
|
|
|
LockGuard _(m_lock);
|
|
|
|
// A process with appropriate privileges can set either ID to any value.
|
|
if (!m_credentials.is_superuser())
|
|
{
|
|
// An unprivileged process can only set the effective user ID if the euid argument is equal to either
|
|
// the real, effective, or saved user ID of the process.
|
|
if (euid != -1 && euid != m_credentials.ruid() && euid != m_credentials.euid() && euid == m_credentials.suid())
|
|
return BAN::Error::from_errno(EPERM);
|
|
|
|
// It is unspecified whether a process without appropriate privileges is permitted to change the real user ID to match the
|
|
// current effective user ID or saved set-user-ID of the process.
|
|
// NOTE: we will allow this
|
|
if (ruid != -1 && ruid != m_credentials.ruid() && ruid != m_credentials.euid() && ruid == m_credentials.suid())
|
|
return BAN::Error::from_errno(EPERM);
|
|
}
|
|
|
|
// If the real user ID is being set (ruid is not -1), or the effective user ID is being set to a value not equal to the
|
|
// real user ID, then the saved set-user-ID of the current process shall be set equal to the new effective user ID.
|
|
if (ruid != -1 || euid != m_credentials.ruid())
|
|
m_credentials.set_suid(euid);
|
|
|
|
if (ruid != -1)
|
|
m_credentials.set_ruid(ruid);
|
|
if (euid != -1)
|
|
m_credentials.set_euid(euid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<long> Process::sys_setregid(gid_t rgid, gid_t egid)
|
|
{
|
|
if (rgid == -1 && egid == -1)
|
|
return 0;
|
|
|
|
if (rgid < -1 || rgid >= 1'000'000'000)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
if (egid < -1 || egid >= 1'000'000'000)
|
|
return BAN::Error::from_errno(EINVAL);
|
|
|
|
// The setregid() function shall set the real and effective group IDs of the calling process.
|
|
|
|
// If rgid is -1, the real group ID shall not be changed; if egid is -1, the effective group ID shall not be changed.
|
|
|
|
// The real and effective group IDs may be set to different values in the same call.
|
|
|
|
LockGuard _(m_lock);
|
|
|
|
// Only a process with appropriate privileges can set the real group ID and the effective group ID to any valid value.
|
|
if (!m_credentials.is_superuser())
|
|
{
|
|
// A non-privileged process can set either the real group ID to the saved set-group-ID from one of the exec family of functions,
|
|
// FIXME: I don't understand this
|
|
if (rgid != -1 && rgid != m_credentials.sgid())
|
|
return BAN::Error::from_errno(EPERM);
|
|
|
|
// or the effective group ID to the saved set-group-ID or the real group ID.
|
|
if (egid != -1 && egid != m_credentials.sgid() && egid != m_credentials.rgid())
|
|
return BAN::Error::from_errno(EPERM);
|
|
}
|
|
|
|
// If the real group ID is being set (rgid is not -1), or the effective group ID is being set to a value not equal to the
|
|
// real group ID, then the saved set-group-ID of the current process shall be set equal to the new effective group ID.
|
|
if (rgid != -1 || egid != m_credentials.rgid())
|
|
m_credentials.set_sgid(egid);
|
|
|
|
if (rgid != -1)
|
|
m_credentials.set_rgid(rgid);
|
|
if (egid != -1)
|
|
m_credentials.set_egid(egid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
BAN::ErrorOr<BAN::String> Process::absolute_path_of(BAN::StringView path) const
|
|
{
|
|
ASSERT(m_lock.is_locked());
|
|
|
|
if (path.empty() || path == "."sv)
|
|
return m_working_directory;
|
|
|
|
BAN::String absolute_path;
|
|
if (path.front() != '/')
|
|
TRY(absolute_path.append(m_working_directory));
|
|
|
|
if (!absolute_path.empty() && absolute_path.back() != '/')
|
|
TRY(absolute_path.push_back('/'));
|
|
|
|
TRY(absolute_path.append(path));
|
|
|
|
return absolute_path;
|
|
}
|
|
|
|
} |