xnu-2782.20.48.tar.gz

[apple/xnu.git] / bsd / dev / dtrace / dtrace_subr.c

diff --git a/bsd/dev/dtrace/dtrace_subr.c b/bsd/dev/dtrace/dtrace_subr.c
index 3d8e65309ba4edbb9eec06d2238e1e19c976fe68..aa8fb6c1a36ac4441652665b140cf29225e2b79a 100644 (file)
--- a/bsd/dev/dtrace/dtrace_subr.c
+++ b/bsd/dev/dtrace/dtrace_subr.c
@@ -34,13 +34,23 @@
 #include <sys/time.h>
 #include <sys/dtrace.h>
 #include <sys/dtrace_impl.h>
 #include <sys/time.h>
 #include <sys/dtrace.h>
 #include <sys/dtrace_impl.h>

+#include <sys/proc_internal.h>

 #include <kern/debug.h>
 #include <kern/debug.h>

+#include <kern/sched_prim.h>
+#include <kern/task.h>

 
 

-#if defined(__APPLE__)
-/* Solaris proc_t is the struct. Darwin's proc_t is a pointer to it. */
-#define proc_t struct proc /* Steer clear of the Darwin typedef for proc_t */
+#if CONFIG_CSR
+#include <sys/codesign.h>
+#include <sys/csr.h>

 #endif
 
 #endif
 

+/*
+ * APPLE NOTE: Solaris proc_t is the struct.
+ * Darwin's proc_t is a pointer to it.
+ */
+#define proc_t struct proc /* Steer clear of the Darwin typedef for proc_t */
+
+

 /* Copied from an arch specific dtrace_subr.c. */
 int (*dtrace_fasttrap_probe_ptr)(struct regs *);
 
 /* Copied from an arch specific dtrace_subr.c. */
 int (*dtrace_fasttrap_probe_ptr)(struct regs *);
 


@@ -49,11 +59,9 @@ int (*dtrace_fasttrap_probe_ptr)(struct regs *);
  * They're assigned in dtrace.c but Darwin never calls them.
  */
 void (*dtrace_cpu_init)(processorid_t);
  * They're assigned in dtrace.c but Darwin never calls them.
  */
 void (*dtrace_cpu_init)(processorid_t);

-void (*dtrace_modload)(struct modctl *);
-void (*dtrace_modunload)(struct modctl *);
-#if defined(__APPLE__)
+int (*dtrace_modload)(struct kmod_info *, uint32_t);
+int (*dtrace_modunload)(struct kmod_info *);

 void (*dtrace_helpers_cleanup)(proc_t *);
 void (*dtrace_helpers_cleanup)(proc_t *);

-#endif

 void (*dtrace_helpers_fork)(proc_t *, proc_t *);
 void (*dtrace_cpustart_init)(void);
 void (*dtrace_cpustart_fini)(void);
 void (*dtrace_helpers_fork)(proc_t *, proc_t *);
 void (*dtrace_cpustart_init)(void);
 void (*dtrace_cpustart_fini)(void);


@@ -80,16 +88,96 @@ void (*dtrace_fasttrap_exit_ptr)(proc_t *);
 void
 dtrace_fasttrap_fork(proc_t *p, proc_t *cp)
 {
 void
 dtrace_fasttrap_fork(proc_t *p, proc_t *cp)
 {

-#if !defined(__APPLE__)
-       ASSERT(p->p_proc_flag & P_PR_LOCK);
-       ASSERT(p->p_dtrace_count > 0);
-#endif /* __APPLE__ */
-

        if (dtrace_fasttrap_fork_ptr) {
                (*dtrace_fasttrap_fork_ptr)(p, cp);
        }
 }
 
        if (dtrace_fasttrap_fork_ptr) {
                (*dtrace_fasttrap_fork_ptr)(p, cp);
        }
 }
 

+
+/*
+ * DTrace wait for process execution
+ *
+ * This feature is using a list of entries, each entry containing a pointer
+ * on a process description. The description is provided by a client, and it
+ * contains the command we want to wait for along with a reserved space for
+ * the caught process id.
+ *
+ * Once an awaited process has been spawned, it will be suspended before
+ * notifying the client. Once the client has been back to userland, it's its
+ * duty to resume the task.
+ */
+
+lck_mtx_t dtrace_procwaitfor_lock;
+
+typedef struct dtrace_proc_awaited_entry {
+       struct dtrace_procdesc                  *pdesc;
+       LIST_ENTRY(dtrace_proc_awaited_entry)   entries;
+} dtrace_proc_awaited_entry_t;
+
+LIST_HEAD(listhead, dtrace_proc_awaited_entry) dtrace_proc_awaited_head
+       = LIST_HEAD_INITIALIZER(dtrace_proc_awaited_head);
+
+void (*dtrace_proc_waitfor_exec_ptr)(proc_t*) = NULL;
+
+static void
+dtrace_proc_exec_notification(proc_t *p) {
+       dtrace_proc_awaited_entry_t *entry, *tmp;
+
+       ASSERT(p);
+       ASSERT(p->p_pid != -1);
+       ASSERT(current_task() != p->task);
+
+       lck_mtx_lock(&dtrace_procwaitfor_lock);
+
+       /*
+        * For each entry, if it has not been matched with a process yet we
+        * try to match it with the newly created process. If they match, the
+        * entry is initialized with the process id and the process task is
+        * suspended. Finally, we wake up the client's waiting thread.
+        */
+       LIST_FOREACH_SAFE(entry, &dtrace_proc_awaited_head, entries, tmp) {
+               if ((entry->pdesc->p_pid == -1)
+                   && !strncmp(entry->pdesc->p_comm, &p->p_comm[0], sizeof(p->p_comm)))
+               {
+                       entry->pdesc->p_pid = p->p_pid;
+                       task_pidsuspend(p->task);
+                       wakeup(entry);
+               }
+       }
+
+       lck_mtx_unlock(&dtrace_procwaitfor_lock);
+}
+
+int
+dtrace_proc_waitfor(dtrace_procdesc_t* pdesc) {
+       dtrace_proc_awaited_entry_t entry;
+       int res;
+
+       ASSERT(pdesc);
+       ASSERT(pdesc->p_comm);
+
+       lck_mtx_lock(&dtrace_procwaitfor_lock);
+
+       /* Initialize and insert the entry, then install the hook. */
+       pdesc->p_pid = -1;
+       entry.pdesc = pdesc;
+       LIST_INSERT_HEAD(&dtrace_proc_awaited_head, &entry, entries);
+       dtrace_proc_waitfor_exec_ptr = &dtrace_proc_exec_notification;
+
+       /* Sleep until the process has been executed */
+       res = msleep(&entry, &dtrace_procwaitfor_lock, PCATCH, "dtrace_proc_waitfor", NULL);
+
+       /* Remove the entry and the hook if it is not needed anymore. */
+       LIST_REMOVE(&entry, entries);
+       if (LIST_EMPTY(&dtrace_proc_awaited_head))
+               dtrace_proc_waitfor_exec_ptr = NULL;
+
+       lck_mtx_unlock(&dtrace_procwaitfor_lock);
+
+       return res;
+}
+
+

 typedef struct dtrace_invop_hdlr {
        int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t);
        struct dtrace_invop_hdlr *dtih_next;
 typedef struct dtrace_invop_hdlr {
        int (*dtih_func)(uintptr_t, uintptr_t *, uintptr_t);
        struct dtrace_invop_hdlr *dtih_next;


@@ -152,3 +240,34 @@ dtrace_invop_remove(int (*func)(uintptr_t, uintptr_t *, uintptr_t))
        kmem_free(hdlr, sizeof (dtrace_invop_hdlr_t));
 }
 
        kmem_free(hdlr, sizeof (dtrace_invop_hdlr_t));
 }
 

+/*
+ * Check if DTrace has been restricted by the current security policy.
+ */
+boolean_t
+dtrace_is_restricted(void)
+{
+#if CONFIG_CSR
+       if (csr_check(CSR_ALLOW_UNRESTRICTED_DTRACE) != 0)
+               return TRUE;
+#endif
+
+       return FALSE;
+}
+
+/*
+ * Check if the process can be attached.
+ */
+boolean_t
+dtrace_can_attach_to_proc(proc_t *proc)
+{
+#pragma unused(proc)
+       ASSERT(proc != NULL);
+
+#if CONFIG_CSR
+       if ((cs_entitlement_flags(proc) & CS_GET_TASK_ALLOW) == 0)
+               return FALSE;
+#endif
+
+       return TRUE;
+}
+