mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
7e4e092653
The way it gets the entropy and blasts it to the buffer is pretty ugly IMHO, but it does work for now. (It should be replaced, by not truncating a u32.) It implements an (unused for now) flags argument, like Linux but instead of OpenBSD's. This is in case we want to distinguish between entropy sources or any other reason and have to implement a new syscall later. Of course, learn from Linux's struggles with entropy sourcing too.
511 lines
17 KiB
C++
511 lines
17 KiB
C++
#pragma once
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#include <AK/InlineLinkedList.h>
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#include <AK/NonnullRefPtrVector.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <AK/WeakPtr.h>
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#include <AK/Weakable.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Lock.h>
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#include <Kernel/Syscall.h>
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#include <Kernel/TTY/TTY.h>
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#include <Kernel/Thread.h>
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#include <Kernel/UnixTypes.h>
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#include <Kernel/VM/RangeAllocator.h>
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#include <LibC/signal_numbers.h>
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class ELFLoader;
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class FileDescription;
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class KBuffer;
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class PageDirectory;
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class Region;
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class VMObject;
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class ProcessTracer;
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class SharedBuffer;
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timeval kgettimeofday();
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void kgettimeofday(timeval&);
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extern VirtualAddress g_return_to_ring3_from_signal_trampoline;
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extern VirtualAddress g_return_to_ring0_from_signal_trampoline;
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class Process : public InlineLinkedListNode<Process>
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, public Weakable<Process> {
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friend class InlineLinkedListNode<Process>;
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friend class Thread;
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public:
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static Process* create_kernel_process(String&& name, void (*entry)());
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static Process* create_user_process(const String& path, uid_t, gid_t, pid_t ppid, int& error, Vector<String>&& arguments = Vector<String>(), Vector<String>&& environment = Vector<String>(), TTY* = nullptr);
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~Process();
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static Vector<pid_t> all_pids();
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static Vector<Process*> all_processes();
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enum Priority : u8 {
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IdlePriority,
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FirstPriority = IdlePriority,
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LowPriority,
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NormalPriority,
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HighPriority,
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LastPriority = HighPriority,
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};
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enum RingLevel : u8 {
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Ring0 = 0,
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Ring3 = 3,
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};
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KBuffer backtrace(ProcessInspectionHandle&) const;
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bool is_dead() const { return m_dead; }
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Thread::State state() const { return main_thread().state(); }
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Thread& main_thread() { return *m_main_thread; }
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const Thread& main_thread() const { return *m_main_thread; }
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bool is_ring0() const { return m_ring == Ring0; }
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bool is_ring3() const { return m_ring == Ring3; }
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PageDirectory& page_directory() { return *m_page_directory; }
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const PageDirectory& page_directory() const { return *m_page_directory; }
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static Process* from_pid(pid_t);
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void set_priority(Priority p) { m_priority = p; }
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Priority priority() const { return m_priority; }
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const String& name() const { return m_name; }
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pid_t pid() const { return m_pid; }
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pid_t sid() const { return m_sid; }
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pid_t pgid() const { return m_pgid; }
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uid_t uid() const { return m_uid; }
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gid_t gid() const { return m_gid; }
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const HashTable<gid_t>& gids() const { return m_gids; }
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uid_t euid() const { return m_euid; }
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gid_t egid() const { return m_egid; }
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pid_t ppid() const { return m_ppid; }
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mode_t umask() const { return m_umask; }
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bool in_group(gid_t) const;
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FileDescription* file_description(int fd);
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const FileDescription* file_description(int fd) const;
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int fd_flags(int fd) const;
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template<typename Callback>
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static void for_each(Callback);
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template<typename Callback>
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static void for_each_in_pgrp(pid_t, Callback);
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template<typename Callback>
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void for_each_child(Callback);
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template<typename Callback>
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void for_each_thread(Callback) const;
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void die();
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void finalize();
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int sys$get_process_name(char* buffer, int buffer_size);
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int sys$watch_file(const char* path, int path_length);
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int sys$dbgputch(u8);
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int sys$dbgputstr(const u8*, int length);
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int sys$dump_backtrace();
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int sys$gettid();
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int sys$donate(int tid);
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int sys$shm_open(const char* name, int flags, mode_t);
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int sys$shm_unlink(const char* name);
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int sys$ftruncate(int fd, off_t);
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pid_t sys$setsid();
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pid_t sys$getsid(pid_t);
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int sys$setpgid(pid_t pid, pid_t pgid);
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pid_t sys$getpgrp();
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pid_t sys$getpgid(pid_t);
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uid_t sys$getuid();
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gid_t sys$getgid();
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uid_t sys$geteuid();
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gid_t sys$getegid();
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pid_t sys$getpid();
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pid_t sys$getppid();
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mode_t sys$umask(mode_t);
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int sys$open(const Syscall::SC_open_params*);
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int sys$close(int fd);
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ssize_t sys$read(int fd, u8*, ssize_t);
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ssize_t sys$write(int fd, const u8*, ssize_t);
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ssize_t sys$writev(int fd, const struct iovec* iov, int iov_count);
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int sys$fstat(int fd, stat*);
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int sys$lstat(const char*, stat*);
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int sys$stat(const char*, stat*);
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int sys$lseek(int fd, off_t, int whence);
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int sys$kill(pid_t pid, int sig);
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[[noreturn]] void sys$exit(int status);
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int sys$sigreturn(RegisterDump& registers);
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pid_t sys$waitpid(pid_t, int* wstatus, int options);
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void* sys$mmap(const Syscall::SC_mmap_params*);
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int sys$munmap(void*, size_t size);
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int sys$set_mmap_name(void*, size_t, const char*);
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int sys$mprotect(void*, size_t, int prot);
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int sys$select(const Syscall::SC_select_params*);
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int sys$poll(pollfd*, int nfds, int timeout);
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ssize_t sys$get_dir_entries(int fd, void*, ssize_t);
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int sys$getcwd(char*, ssize_t);
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int sys$chdir(const char*);
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int sys$fchdir(int fd);
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int sys$sleep(unsigned seconds);
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int sys$usleep(useconds_t usec);
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int sys$gettimeofday(timeval*);
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int sys$gethostname(char*, ssize_t);
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int sys$uname(utsname*);
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int sys$readlink(const char*, char*, ssize_t);
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int sys$ttyname_r(int fd, char*, ssize_t);
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int sys$ptsname_r(int fd, char*, ssize_t);
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pid_t sys$fork(RegisterDump&);
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int sys$execve(const char* filename, const char** argv, const char** envp);
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int sys$isatty(int fd);
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int sys$getdtablesize();
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int sys$dup(int oldfd);
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int sys$dup2(int oldfd, int newfd);
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int sys$sigaction(int signum, const sigaction* act, sigaction* old_act);
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int sys$sigprocmask(int how, const sigset_t* set, sigset_t* old_set);
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int sys$sigpending(sigset_t*);
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int sys$getgroups(ssize_t, gid_t*);
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int sys$setgroups(ssize_t, const gid_t*);
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int sys$pipe(int pipefd[2], int flags);
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int sys$killpg(int pgrp, int sig);
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int sys$setgid(gid_t);
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int sys$setuid(uid_t);
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unsigned sys$alarm(unsigned seconds);
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int sys$access(const char* pathname, int mode);
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int sys$fcntl(int fd, int cmd, u32 extra_arg);
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int sys$ioctl(int fd, unsigned request, unsigned arg);
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int sys$mkdir(const char* pathname, mode_t mode);
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clock_t sys$times(tms*);
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int sys$utime(const char* pathname, const struct utimbuf*);
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int sys$link(const char* old_path, const char* new_path);
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int sys$unlink(const char* pathname);
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int sys$symlink(const char* target, const char* linkpath);
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int sys$rmdir(const char* pathname);
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int sys$mount(const char* device, const char* mountpoint, const char* fstype);
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int sys$umount(const char* mountpoint);
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int sys$read_tsc(u32* lsw, u32* msw);
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int sys$chmod(const char* pathname, mode_t);
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int sys$fchmod(int fd, mode_t);
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int sys$chown(const char* pathname, uid_t, gid_t);
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int sys$fchown(int fd, uid_t, gid_t);
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int sys$socket(int domain, int type, int protocol);
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int sys$bind(int sockfd, const sockaddr* addr, socklen_t);
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int sys$listen(int sockfd, int backlog);
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int sys$accept(int sockfd, sockaddr*, socklen_t*);
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int sys$connect(int sockfd, const sockaddr*, socklen_t);
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ssize_t sys$sendto(const Syscall::SC_sendto_params*);
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ssize_t sys$recvfrom(const Syscall::SC_recvfrom_params*);
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int sys$getsockopt(const Syscall::SC_getsockopt_params*);
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int sys$setsockopt(const Syscall::SC_setsockopt_params*);
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int sys$getsockname(int sockfd, sockaddr* addr, socklen_t* addrlen);
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int sys$getpeername(int sockfd, sockaddr* addr, socklen_t* addrlen);
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int sys$sched_setparam(pid_t pid, const struct sched_param* param);
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int sys$sched_getparam(pid_t pid, struct sched_param* param);
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int sys$restore_signal_mask(u32 mask);
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int sys$create_thread(int (*)(void*), void*);
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void sys$exit_thread(int code);
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int sys$rename(const char* oldpath, const char* newpath);
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int sys$systrace(pid_t);
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int sys$mknod(const char* pathname, mode_t, dev_t);
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int sys$create_shared_buffer(int, void** buffer);
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int sys$share_buffer_with(int, pid_t peer_pid);
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int sys$share_buffer_globally(int);
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void* sys$get_shared_buffer(int shared_buffer_id);
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int sys$release_shared_buffer(int shared_buffer_id);
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int sys$seal_shared_buffer(int shared_buffer_id);
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int sys$get_shared_buffer_size(int shared_buffer_id);
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int sys$halt();
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int sys$reboot();
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int sys$set_process_icon(int icon_id);
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int sys$realpath(const char* pathname, char*, size_t);
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ssize_t sys$getrandom(void*, size_t, unsigned int);
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static void initialize();
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[[noreturn]] void crash(int signal, u32 eip);
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[[nodiscard]] static int reap(Process&);
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const TTY* tty() const { return m_tty; }
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void set_tty(TTY* tty) { m_tty = tty; }
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size_t region_count() const { return m_regions.size(); }
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const NonnullOwnPtrVector<Region>& regions() const { return m_regions; }
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void dump_regions();
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ProcessTracer* tracer() { return m_tracer.ptr(); }
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ProcessTracer& ensure_tracer();
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u32 m_ticks_in_user { 0 };
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u32 m_ticks_in_kernel { 0 };
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u32 m_ticks_in_user_for_dead_children { 0 };
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u32 m_ticks_in_kernel_for_dead_children { 0 };
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bool validate_read_from_kernel(VirtualAddress) const;
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bool validate_read(const void*, ssize_t) const;
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bool validate_write(void*, ssize_t) const;
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bool validate_read_str(const char* str);
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template<typename T>
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bool validate_read_typed(T* value, size_t count = 1) { return validate_read(value, sizeof(T) * count); }
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template<typename T>
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bool validate_write_typed(T* value, size_t count = 1) { return validate_write(value, sizeof(T) * count); }
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Custody& current_directory();
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Custody* executable() { return m_executable.ptr(); }
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int number_of_open_file_descriptors() const;
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int max_open_file_descriptors() const { return m_max_open_file_descriptors; }
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size_t amount_virtual() const;
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size_t amount_resident() const;
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size_t amount_shared() const;
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Process* fork(RegisterDump&);
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int exec(String path, Vector<String> arguments, Vector<String> environment);
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bool is_superuser() const { return m_euid == 0; }
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Region* allocate_region_with_vmo(VirtualAddress, size_t, NonnullRefPtr<VMObject>, size_t offset_in_vmo, const String& name, int prot);
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Region* allocate_file_backed_region(VirtualAddress, size_t, NonnullRefPtr<Inode>, const String& name, int prot);
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Region* allocate_region(VirtualAddress, size_t, const String& name, int prot = PROT_READ | PROT_WRITE, bool commit = true);
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bool deallocate_region(Region& region);
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Region& allocate_split_region(const Region& source_region, const Range&, size_t offset_in_vmo);
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void set_being_inspected(bool b) { m_being_inspected = b; }
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bool is_being_inspected() const { return m_being_inspected; }
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void terminate_due_to_signal(u8 signal);
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void send_signal(u8, Process* sender);
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int thread_count() const;
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Lock& big_lock() { return m_big_lock; }
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unsigned syscall_count() const { return m_syscall_count; }
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void did_syscall() { ++m_syscall_count; }
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unsigned inode_faults() const { return m_inode_faults; }
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void did_inode_fault() { ++m_inode_faults; }
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unsigned zero_faults() const { return m_zero_faults; }
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void did_zero_fault() { ++m_zero_faults; }
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unsigned cow_faults() const { return m_cow_faults; }
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void did_cow_fault() { ++m_cow_faults; }
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const ELFLoader* elf_loader() const { return m_elf_loader.ptr(); }
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int icon_id() const { return m_icon_id; }
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private:
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friend class MemoryManager;
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friend class Scheduler;
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friend class Region;
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Process(String&& name, uid_t, gid_t, pid_t ppid, RingLevel, RefPtr<Custody> cwd = nullptr, RefPtr<Custody> executable = nullptr, TTY* = nullptr, Process* fork_parent = nullptr);
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Range allocate_range(VirtualAddress, size_t);
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int do_exec(String path, Vector<String> arguments, Vector<String> environment);
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ssize_t do_write(FileDescription&, const u8*, int data_size);
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int alloc_fd(int first_candidate_fd = 0);
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void disown_all_shared_buffers();
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KResultOr<String> find_shebang_interpreter_for_executable(const String& executable_path);
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Thread* m_main_thread { nullptr };
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RefPtr<PageDirectory> m_page_directory;
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Process* m_prev { nullptr };
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Process* m_next { nullptr };
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String m_name;
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pid_t m_pid { 0 };
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uid_t m_uid { 0 };
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gid_t m_gid { 0 };
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uid_t m_euid { 0 };
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gid_t m_egid { 0 };
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pid_t m_sid { 0 };
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pid_t m_pgid { 0 };
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static const int m_max_open_file_descriptors { FD_SETSIZE };
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struct FileDescriptionAndFlags {
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operator bool() const { return !!description; }
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void clear();
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void set(NonnullRefPtr<FileDescription>&& d, u32 f = 0);
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RefPtr<FileDescription> description;
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u32 flags { 0 };
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};
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Vector<FileDescriptionAndFlags> m_fds;
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RingLevel m_ring { Ring0 };
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Priority m_priority { NormalPriority };
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u8 m_termination_status { 0 };
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u8 m_termination_signal { 0 };
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bool m_being_inspected { false };
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bool m_dead { false };
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RefPtr<Custody> m_executable;
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RefPtr<Custody> m_cwd;
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TTY* m_tty { nullptr };
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Region* region_from_range(const Range&);
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Region* region_containing(const Range&);
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NonnullOwnPtrVector<Region> m_regions;
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pid_t m_ppid { 0 };
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mode_t m_umask { 022 };
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static void notify_waiters(pid_t waitee, int exit_status, int signal);
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HashTable<gid_t> m_gids;
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int m_next_tid { 0 };
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unsigned m_syscall_count { 0 };
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unsigned m_inode_faults { 0 };
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unsigned m_zero_faults { 0 };
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unsigned m_cow_faults { 0 };
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RefPtr<ProcessTracer> m_tracer;
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OwnPtr<ELFLoader> m_elf_loader;
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Region* m_master_tls_region { nullptr };
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size_t m_master_tls_size { 0 };
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size_t m_master_tls_alignment { 0 };
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Lock m_big_lock { "Process" };
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u64 m_alarm_deadline { 0 };
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int m_icon_id { -1 };
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};
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class ProcessInspectionHandle {
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public:
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ProcessInspectionHandle(Process& process)
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: m_process(process)
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{
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if (&process != ¤t->process()) {
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ASSERT(!m_process.is_being_inspected());
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m_process.set_being_inspected(true);
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}
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}
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~ProcessInspectionHandle()
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{
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m_process.set_being_inspected(false);
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}
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Process& process() { return m_process; }
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static OwnPtr<ProcessInspectionHandle> from_pid(pid_t pid)
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{
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InterruptDisabler disabler;
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auto* process = Process::from_pid(pid);
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if (process)
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return make<ProcessInspectionHandle>(*process);
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return nullptr;
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}
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Process* operator->() { return &m_process; }
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Process& operator*() { return m_process; }
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private:
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Process& m_process;
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};
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extern const char* to_string(Process::Priority);
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extern InlineLinkedList<Process>* g_processes;
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template<typename Callback>
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inline void Process::for_each(Callback callback)
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{
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ASSERT_INTERRUPTS_DISABLED();
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for (auto* process = g_processes->head(); process;) {
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auto* next_process = process->next();
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if (callback(*process) == IterationDecision::Break)
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break;
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process = next_process;
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}
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}
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template<typename Callback>
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inline void Process::for_each_child(Callback callback)
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{
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ASSERT_INTERRUPTS_DISABLED();
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pid_t my_pid = pid();
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for (auto* process = g_processes->head(); process;) {
|
|
auto* next_process = process->next();
|
|
if (process->ppid() == my_pid) {
|
|
if (callback(*process) == IterationDecision::Break)
|
|
break;
|
|
}
|
|
process = next_process;
|
|
}
|
|
}
|
|
|
|
template<typename Callback>
|
|
inline void Process::for_each_thread(Callback callback) const
|
|
{
|
|
InterruptDisabler disabler;
|
|
pid_t my_pid = pid();
|
|
Thread::for_each([callback, my_pid](Thread& thread) -> IterationDecision {
|
|
if (thread.pid() == my_pid)
|
|
return callback(thread);
|
|
|
|
return IterationDecision::Continue;
|
|
});
|
|
}
|
|
|
|
template<typename Callback>
|
|
inline void Process::for_each_in_pgrp(pid_t pgid, Callback callback)
|
|
{
|
|
ASSERT_INTERRUPTS_DISABLED();
|
|
for (auto* process = g_processes->head(); process;) {
|
|
auto* next_process = process->next();
|
|
if (process->pgid() == pgid) {
|
|
if (callback(*process) == IterationDecision::Break)
|
|
break;
|
|
}
|
|
process = next_process;
|
|
}
|
|
}
|
|
|
|
inline bool InodeMetadata::may_read(Process& process) const
|
|
{
|
|
return may_read(process.euid(), process.gids());
|
|
}
|
|
|
|
inline bool InodeMetadata::may_write(Process& process) const
|
|
{
|
|
return may_write(process.euid(), process.gids());
|
|
}
|
|
|
|
inline bool InodeMetadata::may_execute(Process& process) const
|
|
{
|
|
return may_execute(process.euid(), process.gids());
|
|
}
|
|
|
|
inline int Thread::pid() const
|
|
{
|
|
return m_process.pid();
|
|
}
|
|
|
|
inline const LogStream& operator<<(const LogStream& stream, const Process& process)
|
|
{
|
|
return stream << process.name() << '(' << process.pid() << ')';
|
|
}
|