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420 lines
15 KiB
420 lines
15 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#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/sched/signal.h> /* For send_sig(), same_thread_group(), etc. */ |
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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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#include <linux/seccomp.h> |
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/* Add sp to seccomp_data, as seccomp is user API, we don't want to modify it */ |
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struct syscall_info { |
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__u64 sp; |
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struct seccomp_data data; |
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}; |
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extern int ptrace_access_vm(struct task_struct *tsk, unsigned long addr, |
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void *buf, int len, unsigned int gup_flags); |
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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_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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#define PT_SUSPEND_SECCOMP (PTRACE_O_SUSPEND_SECCOMP << 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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const struct cred *ptracer_cred); |
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extern void __ptrace_unlink(struct task_struct *child); |
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extern void exit_ptrace(struct task_struct *tracer, struct list_head *dead); |
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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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#define PTRACE_MODE_FSCREDS 0x08 |
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#define PTRACE_MODE_REALCREDS 0x10 |
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/* shorthands for READ/ATTACH and FSCREDS/REALCREDS combinations */ |
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#define PTRACE_MODE_READ_FSCREDS (PTRACE_MODE_READ | PTRACE_MODE_FSCREDS) |
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#define PTRACE_MODE_READ_REALCREDS (PTRACE_MODE_READ | PTRACE_MODE_REALCREDS) |
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#define PTRACE_MODE_ATTACH_FSCREDS (PTRACE_MODE_ATTACH | PTRACE_MODE_FSCREDS) |
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#define PTRACE_MODE_ATTACH_REALCREDS (PTRACE_MODE_ATTACH | PTRACE_MODE_REALCREDS) |
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/** |
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* ptrace_may_access - check whether the caller is permitted to access |
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* a target task. |
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* @task: target task |
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* @mode: selects type of access and caller credentials |
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* |
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* Returns true on success, false on denial. |
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* |
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* One of the flags PTRACE_MODE_FSCREDS and PTRACE_MODE_REALCREDS must |
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* be set in @mode to specify whether the access was requested through |
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* a filesystem syscall (should use effective capabilities and fsuid |
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* of the caller) or through an explicit syscall such as |
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* process_vm_writev or ptrace (and should use the real credentials). |
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*/ |
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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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* 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, current->ptracer_cred); |
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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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} |
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else |
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child->ptracer_cred = NULL; |
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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_REPORT |
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extern void user_single_step_report(struct pt_regs *regs); |
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#else |
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static inline void user_single_step_report(struct pt_regs *regs) |
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{ |
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kernel_siginfo_t info; |
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clear_siginfo(&info); |
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info.si_signo = SIGTRAP; |
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info.si_errno = 0; |
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info.si_code = SI_USER; |
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info.si_pid = 0; |
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info.si_uid = 0; |
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force_sig_info(&info); |
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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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/* |
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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, struct syscall_info *info); |
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extern void sigaction_compat_abi(struct k_sigaction *act, struct k_sigaction *oact); |
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#endif
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