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-rw-r--r--include/linux/ptrace.h104
1 files changed, 73 insertions, 31 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 9178d5cc0b01..800f113bea66 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -47,6 +47,13 @@
#define PTRACE_GETREGSET 0x4204
#define PTRACE_SETREGSET 0x4205
+#define PTRACE_SEIZE 0x4206
+#define PTRACE_INTERRUPT 0x4207
+#define PTRACE_LISTEN 0x4208
+
+/* flags in @data for PTRACE_SEIZE */
+#define PTRACE_SEIZE_DEVEL 0x80000000 /* temp flag for development */
+
/* options set using PTRACE_SETOPTIONS */
#define PTRACE_O_TRACESYSGOOD 0x00000001
#define PTRACE_O_TRACEFORK 0x00000002
@@ -65,6 +72,7 @@
#define PTRACE_EVENT_EXEC 4
#define PTRACE_EVENT_VFORK_DONE 5
#define PTRACE_EVENT_EXIT 6
+#define PTRACE_EVENT_STOP 7
#include <asm/ptrace.h>
@@ -77,16 +85,22 @@
* flags. When the a task is stopped the ptracer owns task->ptrace.
*/
+#define PT_SEIZED 0x00010000 /* SEIZE used, enable new behavior */
#define PT_PTRACED 0x00000001
#define PT_DTRACE 0x00000002 /* delayed trace (used on m68k, i386) */
#define PT_TRACESYSGOOD 0x00000004
#define PT_PTRACE_CAP 0x00000008 /* ptracer can follow suid-exec */
-#define PT_TRACE_FORK 0x00000010
-#define PT_TRACE_VFORK 0x00000020
-#define PT_TRACE_CLONE 0x00000040
-#define PT_TRACE_EXEC 0x00000080
-#define PT_TRACE_VFORK_DONE 0x00000100
-#define PT_TRACE_EXIT 0x00000200
+
+/* PT_TRACE_* event enable flags */
+#define PT_EVENT_FLAG_SHIFT 4
+#define PT_EVENT_FLAG(event) (1 << (PT_EVENT_FLAG_SHIFT + (event) - 1))
+
+#define PT_TRACE_FORK PT_EVENT_FLAG(PTRACE_EVENT_FORK)
+#define PT_TRACE_VFORK PT_EVENT_FLAG(PTRACE_EVENT_VFORK)
+#define PT_TRACE_CLONE PT_EVENT_FLAG(PTRACE_EVENT_CLONE)
+#define PT_TRACE_EXEC PT_EVENT_FLAG(PTRACE_EVENT_EXEC)
+#define PT_TRACE_VFORK_DONE PT_EVENT_FLAG(PTRACE_EVENT_VFORK_DONE)
+#define PT_TRACE_EXIT PT_EVENT_FLAG(PTRACE_EVENT_EXIT)
#define PT_TRACE_MASK 0x000003f4
@@ -105,7 +119,7 @@ extern long arch_ptrace(struct task_struct *child, long request,
extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len);
extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len);
extern void ptrace_disable(struct task_struct *);
-extern int ptrace_check_attach(struct task_struct *task, int kill);
+extern int ptrace_check_attach(struct task_struct *task, bool ignore_state);
extern int ptrace_request(struct task_struct *child, long request,
unsigned long addr, unsigned long data);
extern void ptrace_notify(int exit_code);
@@ -122,7 +136,7 @@ extern bool ptrace_may_access(struct task_struct *task, unsigned int mode);
static inline int ptrace_reparented(struct task_struct *child)
{
- return child->real_parent != child->parent;
+ return !same_thread_group(child->real_parent, child->parent);
}
static inline void ptrace_unlink(struct task_struct *child)
@@ -137,36 +151,56 @@ int generic_ptrace_pokedata(struct task_struct *tsk, unsigned long addr,
unsigned long data);
/**
- * task_ptrace - return %PT_* flags that apply to a task
- * @task: pointer to &task_struct in question
+ * ptrace_parent - return the task that is tracing the given task
+ * @task: task to consider
*
- * Returns the %PT_* flags that apply to @task.
+ * Returns %NULL if no one is tracing @task, or the &struct task_struct
+ * pointer to its tracer.
+ *
+ * Must called under rcu_read_lock(). The pointer returned might be kept
+ * live only by RCU. During exec, this may be called with task_lock() held
+ * on @task, still held from when check_unsafe_exec() was called.
*/
-static inline int task_ptrace(struct task_struct *task)
+static inline struct task_struct *ptrace_parent(struct task_struct *task)
{
- return task->ptrace;
+ if (unlikely(task->ptrace))
+ return rcu_dereference(task->parent);
+ return NULL;
+}
+
+/**
+ * ptrace_event_enabled - test whether a ptrace event is enabled
+ * @task: ptracee of interest
+ * @event: %PTRACE_EVENT_* to test
+ *
+ * Test whether @event is enabled for ptracee @task.
+ *
+ * Returns %true if @event is enabled, %false otherwise.
+ */
+static inline bool ptrace_event_enabled(struct task_struct *task, int event)
+{
+ return task->ptrace & PT_EVENT_FLAG(event);
}
/**
* ptrace_event - possibly stop for a ptrace event notification
- * @mask: %PT_* bit to check in @current->ptrace
- * @event: %PTRACE_EVENT_* value to report if @mask is set
+ * @event: %PTRACE_EVENT_* value to report
* @message: value for %PTRACE_GETEVENTMSG to return
*
- * This checks the @mask bit to see if ptrace wants stops for this event.
- * If so we stop, reporting @event and @message to the ptrace parent.
- *
- * Returns nonzero if we did a ptrace notification, zero if not.
+ * Check whether @event is enabled and, if so, report @event and @message
+ * to the ptrace parent.
*
* Called without locks.
*/
-static inline int ptrace_event(int mask, int event, unsigned long message)
+static inline void ptrace_event(int event, unsigned long message)
{
- if (mask && likely(!(current->ptrace & mask)))
- return 0;
- current->ptrace_message = message;
- ptrace_notify((event << 8) | SIGTRAP);
- return 1;
+ if (unlikely(ptrace_event_enabled(current, event))) {
+ current->ptrace_message = message;
+ ptrace_notify((event << 8) | SIGTRAP);
+ } else if (event == PTRACE_EVENT_EXEC && unlikely(current->ptrace)) {
+ /* legacy EXEC report via SIGTRAP */
+ send_sig(SIGTRAP, current, 0);
+ }
}
/**
@@ -183,16 +217,24 @@ static inline void ptrace_init_task(struct task_struct *child, bool ptrace)
{
INIT_LIST_HEAD(&child->ptrace_entry);
INIT_LIST_HEAD(&child->ptraced);
- child->parent = child->real_parent;
+#ifdef CONFIG_HAVE_HW_BREAKPOINT
+ atomic_set(&child->ptrace_bp_refcnt, 1);
+#endif
+ child->jobctl = 0;
child->ptrace = 0;
- if (unlikely(ptrace) && (current->ptrace & PT_PTRACED)) {
+ child->parent = child->real_parent;
+
+ if (unlikely(ptrace) && current->ptrace) {
child->ptrace = current->ptrace;
__ptrace_link(child, current->parent);
- }
-#ifdef CONFIG_HAVE_HW_BREAKPOINT
- atomic_set(&child->ptrace_bp_refcnt, 1);
-#endif
+ if (child->ptrace & PT_SEIZED)
+ task_set_jobctl_pending(child, JOBCTL_TRAP_STOP);
+ else
+ sigaddset(&child->pending.signal, SIGSTOP);
+
+ set_tsk_thread_flag(child, TIF_SIGPENDING);
+ }
}
/**

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