387 lines
14 KiB
C
Executable File
387 lines
14 KiB
C
Executable File
#ifndef _LINUX_PTRACE_H
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#define _LINUX_PTRACE_H
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#include <linux/compiler.h> /* For unlikely. */
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#include <linux/sched.h> /* For struct task_struct. */
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#include <linux/err.h> /* for IS_ERR_VALUE */
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#include <linux/bug.h> /* For BUG_ON. */
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#include <linux/pid_namespace.h> /* For task_active_pid_ns. */
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#include <uapi/linux/ptrace.h>
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/*
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* Ptrace flags
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*
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* The owner ship rules for task->ptrace which holds the ptrace
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* flags is simple. When a task is running it owns it's task->ptrace
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* flags. When the a task is stopped the ptracer owns task->ptrace.
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*/
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#define PT_SEIZED 0x00010000 /* SEIZE used, enable new behavior */
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#define PT_PTRACED 0x00000001
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#define PT_DTRACE 0x00000002 /* delayed trace (used on m68k, i386) */
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#define PT_PTRACE_CAP 0x00000004 /* ptracer can follow suid-exec */
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#define PT_OPT_FLAG_SHIFT 3
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/* PT_TRACE_* event enable flags */
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#define PT_EVENT_FLAG(event) (1 << (PT_OPT_FLAG_SHIFT + (event)))
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#define PT_TRACESYSGOOD PT_EVENT_FLAG(0)
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#define PT_TRACE_FORK PT_EVENT_FLAG(PTRACE_EVENT_FORK)
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#define PT_TRACE_VFORK PT_EVENT_FLAG(PTRACE_EVENT_VFORK)
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#define PT_TRACE_CLONE PT_EVENT_FLAG(PTRACE_EVENT_CLONE)
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#define PT_TRACE_EXEC PT_EVENT_FLAG(PTRACE_EVENT_EXEC)
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#define PT_TRACE_VFORK_DONE PT_EVENT_FLAG(PTRACE_EVENT_VFORK_DONE)
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#define PT_TRACE_EXIT PT_EVENT_FLAG(PTRACE_EVENT_EXIT)
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#define PT_TRACE_SECCOMP PT_EVENT_FLAG(PTRACE_EVENT_SECCOMP)
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#define PT_EXITKILL (PTRACE_O_EXITKILL << PT_OPT_FLAG_SHIFT)
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/* single stepping state bits (used on ARM and PA-RISC) */
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#define PT_SINGLESTEP_BIT 31
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#define PT_SINGLESTEP (1<<PT_SINGLESTEP_BIT)
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#define PT_BLOCKSTEP_BIT 30
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#define PT_BLOCKSTEP (1<<PT_BLOCKSTEP_BIT)
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extern long arch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data);
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extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len);
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extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len);
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extern void ptrace_disable(struct task_struct *);
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extern int ptrace_request(struct task_struct *child, long request,
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unsigned long addr, unsigned long data);
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extern void ptrace_notify(int exit_code);
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extern void __ptrace_link(struct task_struct *child,
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struct task_struct *new_parent);
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extern void __ptrace_unlink(struct task_struct *child);
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extern void exit_ptrace(struct task_struct *tracer);
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#define PTRACE_MODE_READ 0x01
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#define PTRACE_MODE_ATTACH 0x02
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#define PTRACE_MODE_NOAUDIT 0x04
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/* Returns true on success, false on denial. */
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extern bool ptrace_may_access(struct task_struct *task, unsigned int mode);
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static inline int ptrace_reparented(struct task_struct *child)
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{
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return !same_thread_group(child->real_parent, child->parent);
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}
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static inline void ptrace_unlink(struct task_struct *child)
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{
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if (unlikely(child->ptrace))
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__ptrace_unlink(child);
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}
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int generic_ptrace_peekdata(struct task_struct *tsk, unsigned long addr,
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unsigned long data);
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int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr,
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unsigned long data);
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/**
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* ptrace_parent - return the task that is tracing the given task
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* @task: task to consider
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*
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* Returns %NULL if no one is tracing @task, or the &struct task_struct
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* pointer to its tracer.
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*
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* Must called under rcu_read_lock(). The pointer returned might be kept
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* live only by RCU. During exec, this may be called with task_lock() held
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* on @task, still held from when check_unsafe_exec() was called.
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*/
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static inline struct task_struct *ptrace_parent(struct task_struct *task)
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{
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if (unlikely(task->ptrace))
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return rcu_dereference(task->parent);
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return NULL;
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}
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/**
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* ptrace_event_enabled - test whether a ptrace event is enabled
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* @task: ptracee of interest
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* @event: %PTRACE_EVENT_* to test
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*
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* Test whether @event is enabled for ptracee @task.
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*
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* Returns %true if @event is enabled, %false otherwise.
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*/
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static inline bool ptrace_event_enabled(struct task_struct *task, int event)
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{
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return task->ptrace & PT_EVENT_FLAG(event);
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}
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/**
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* ptrace_event - possibly stop for a ptrace event notification
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* @event: %PTRACE_EVENT_* value to report
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* @message: value for %PTRACE_GETEVENTMSG to return
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*
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* Check whether @event is enabled and, if so, report @event and @message
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* to the ptrace parent.
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*
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* Called without locks.
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*/
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static inline void ptrace_event(int event, unsigned long message)
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{
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if (unlikely(ptrace_event_enabled(current, event))) {
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current->ptrace_message = message;
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ptrace_notify((event << 8) | SIGTRAP);
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} else if (event == PTRACE_EVENT_EXEC) {
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/* legacy EXEC report via SIGTRAP */
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if ((current->ptrace & (PT_PTRACED|PT_SEIZED)) == PT_PTRACED)
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send_sig(SIGTRAP, current, 0);
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}
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}
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/**
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* ptrace_event_pid - possibly stop for a ptrace event notification
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* @event: %PTRACE_EVENT_* value to report
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* @pid: process identifier for %PTRACE_GETEVENTMSG to return
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*
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* Check whether @event is enabled and, if so, report @event and @pid
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* to the ptrace parent. @pid is reported as the pid_t seen from the
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* the ptrace parent's pid namespace.
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*
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* Called without locks.
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*/
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static inline void ptrace_event_pid(int event, struct pid *pid)
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{
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/*
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* FIXME: There's a potential race if a ptracer in a different pid
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* namespace than parent attaches between computing message below and
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* when we acquire tasklist_lock in ptrace_stop(). If this happens,
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* the ptracer will get a bogus pid from PTRACE_GETEVENTMSG.
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*/
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unsigned long message = 0;
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struct pid_namespace *ns;
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rcu_read_lock();
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ns = task_active_pid_ns(rcu_dereference(current->parent));
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if (ns)
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message = pid_nr_ns(pid, ns);
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rcu_read_unlock();
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ptrace_event(event, message);
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}
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/**
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* ptrace_init_task - initialize ptrace state for a new child
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* @child: new child task
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* @ptrace: true if child should be ptrace'd by parent's tracer
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*
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* This is called immediately after adding @child to its parent's children
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* list. @ptrace is false in the normal case, and true to ptrace @child.
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*
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* Called with current's siglock and write_lock_irq(&tasklist_lock) held.
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*/
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static inline void ptrace_init_task(struct task_struct *child, bool ptrace)
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{
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INIT_LIST_HEAD(&child->ptrace_entry);
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INIT_LIST_HEAD(&child->ptraced);
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child->jobctl = 0;
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child->ptrace = 0;
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child->parent = child->real_parent;
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if (unlikely(ptrace) && current->ptrace) {
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child->ptrace = current->ptrace;
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__ptrace_link(child, current->parent);
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if (child->ptrace & PT_SEIZED)
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task_set_jobctl_pending(child, JOBCTL_TRAP_STOP);
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else
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sigaddset(&child->pending.signal, SIGSTOP);
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set_tsk_thread_flag(child, TIF_SIGPENDING);
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}
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}
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/**
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* ptrace_release_task - final ptrace-related cleanup of a zombie being reaped
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* @task: task in %EXIT_DEAD state
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*
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* Called with write_lock(&tasklist_lock) held.
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*/
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static inline void ptrace_release_task(struct task_struct *task)
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{
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BUG_ON(!list_empty(&task->ptraced));
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ptrace_unlink(task);
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BUG_ON(!list_empty(&task->ptrace_entry));
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}
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#ifndef force_successful_syscall_return
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/*
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* System call handlers that, upon successful completion, need to return a
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* negative value should call force_successful_syscall_return() right before
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* returning. On architectures where the syscall convention provides for a
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* separate error flag (e.g., alpha, ia64, ppc{,64}, sparc{,64}, possibly
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* others), this macro can be used to ensure that the error flag will not get
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* set. On architectures which do not support a separate error flag, the macro
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* is a no-op and the spurious error condition needs to be filtered out by some
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* other means (e.g., in user-level, by passing an extra argument to the
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* syscall handler, or something along those lines).
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*/
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#define force_successful_syscall_return() do { } while (0)
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#endif
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#ifndef is_syscall_success
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/*
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* On most systems we can tell if a syscall is a success based on if the retval
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* is an error value. On some systems like ia64 and powerpc they have different
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* indicators of success/failure and must define their own.
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*/
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#define is_syscall_success(regs) (!IS_ERR_VALUE((unsigned long)(regs_return_value(regs))))
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#endif
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/*
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* <asm/ptrace.h> should define the following things inside #ifdef __KERNEL__.
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*
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* These do-nothing inlines are used when the arch does not
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* implement single-step. The kerneldoc comments are here
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* to document the interface for all arch definitions.
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*/
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#ifndef arch_has_single_step
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/**
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* arch_has_single_step - does this CPU support user-mode single-step?
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*
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* If this is defined, then there must be function declarations or
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* inlines for user_enable_single_step() and user_disable_single_step().
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* arch_has_single_step() should evaluate to nonzero iff the machine
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* supports instruction single-step for user mode.
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* It can be a constant or it can test a CPU feature bit.
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*/
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#define arch_has_single_step() (0)
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/**
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* user_enable_single_step - single-step in user-mode task
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* @task: either current or a task stopped in %TASK_TRACED
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*
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* This can only be called when arch_has_single_step() has returned nonzero.
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* Set @task so that when it returns to user mode, it will trap after the
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* next single instruction executes. If arch_has_block_step() is defined,
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* this must clear the effects of user_enable_block_step() too.
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*/
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static inline void user_enable_single_step(struct task_struct *task)
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{
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BUG(); /* This can never be called. */
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}
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/**
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* user_disable_single_step - cancel user-mode single-step
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* @task: either current or a task stopped in %TASK_TRACED
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*
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* Clear @task of the effects of user_enable_single_step() and
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* user_enable_block_step(). This can be called whether or not either
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* of those was ever called on @task, and even if arch_has_single_step()
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* returned zero.
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*/
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static inline void user_disable_single_step(struct task_struct *task)
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{
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}
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#else
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extern void user_enable_single_step(struct task_struct *);
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extern void user_disable_single_step(struct task_struct *);
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#endif /* arch_has_single_step */
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#ifndef arch_has_block_step
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/**
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* arch_has_block_step - does this CPU support user-mode block-step?
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*
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* If this is defined, then there must be a function declaration or inline
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* for user_enable_block_step(), and arch_has_single_step() must be defined
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* too. arch_has_block_step() should evaluate to nonzero iff the machine
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* supports step-until-branch for user mode. It can be a constant or it
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* can test a CPU feature bit.
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*/
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#define arch_has_block_step() (0)
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/**
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* user_enable_block_step - step until branch in user-mode task
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* @task: either current or a task stopped in %TASK_TRACED
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*
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* This can only be called when arch_has_block_step() has returned nonzero,
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* and will never be called when single-instruction stepping is being used.
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* Set @task so that when it returns to user mode, it will trap after the
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* next branch or trap taken.
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*/
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static inline void user_enable_block_step(struct task_struct *task)
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{
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BUG(); /* This can never be called. */
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}
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#else
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extern void user_enable_block_step(struct task_struct *);
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#endif /* arch_has_block_step */
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#ifdef ARCH_HAS_USER_SINGLE_STEP_INFO
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extern void user_single_step_siginfo(struct task_struct *tsk,
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struct pt_regs *regs, siginfo_t *info);
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#else
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static inline void user_single_step_siginfo(struct task_struct *tsk,
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struct pt_regs *regs, siginfo_t *info)
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{
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memset(info, 0, sizeof(*info));
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info->si_signo = SIGTRAP;
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}
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#endif
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#ifndef arch_ptrace_stop_needed
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/**
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* arch_ptrace_stop_needed - Decide whether arch_ptrace_stop() should be called
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* @code: current->exit_code value ptrace will stop with
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* @info: siginfo_t pointer (or %NULL) for signal ptrace will stop with
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*
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* This is called with the siglock held, to decide whether or not it's
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* necessary to release the siglock and call arch_ptrace_stop() with the
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* same @code and @info arguments. It can be defined to a constant if
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* arch_ptrace_stop() is never required, or always is. On machines where
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* this makes sense, it should be defined to a quick test to optimize out
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* calling arch_ptrace_stop() when it would be superfluous. For example,
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* if the thread has not been back to user mode since the last stop, the
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* thread state might indicate that nothing needs to be done.
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*
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* This is guaranteed to be invoked once before a task stops for ptrace and
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* may include arch-specific operations necessary prior to a ptrace stop.
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*/
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#define arch_ptrace_stop_needed(code, info) (0)
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#endif
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#ifndef arch_ptrace_stop
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/**
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* arch_ptrace_stop - Do machine-specific work before stopping for ptrace
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* @code: current->exit_code value ptrace will stop with
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* @info: siginfo_t pointer (or %NULL) for signal ptrace will stop with
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*
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* This is called with no locks held when arch_ptrace_stop_needed() has
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* just returned nonzero. It is allowed to block, e.g. for user memory
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* access. The arch can have machine-specific work to be done before
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* ptrace stops. On ia64, register backing store gets written back to user
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* memory here. Since this can be costly (requires dropping the siglock),
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* we only do it when the arch requires it for this particular stop, as
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* indicated by arch_ptrace_stop_needed().
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*/
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#define arch_ptrace_stop(code, info) do { } while (0)
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#endif
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#ifndef current_pt_regs
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#define current_pt_regs() task_pt_regs(current)
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#endif
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#ifndef ptrace_signal_deliver
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#define ptrace_signal_deliver() ((void)0)
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#endif
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/*
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* unlike current_pt_regs(), this one is equal to task_pt_regs(current)
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* on *all* architectures; the only reason to have a per-arch definition
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* is optimisation.
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*/
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#ifndef signal_pt_regs
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#define signal_pt_regs() task_pt_regs(current)
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#endif
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#ifndef current_user_stack_pointer
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#define current_user_stack_pointer() user_stack_pointer(current_pt_regs())
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#endif
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extern int task_current_syscall(struct task_struct *target, long *callno,
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unsigned long args[6], unsigned int maxargs,
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unsigned long *sp, unsigned long *pc);
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#endif
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