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authorOleg Nesterov <oleg@redhat.com>2013-10-13 23:18:31 +0400
committerOleg Nesterov <oleg@redhat.com>2013-10-29 21:02:48 +0400
commitb68e0749100e1b901bf11330f149b321c082178e (patch)
treee6950bc5bafbb845ce1f7650e738e6aac7e12b12 /kernel
parentc2d3f25dda016d9697c5416810d4528770f0a281 (diff)
downloadlinux-b68e0749100e1b901bf11330f149b321c082178e.tar.xz
uprobes: Change the callsite of uprobe_copy_process()
Preparation for the next patches. Move the callsite of uprobe_copy_process() in copy_process() down to the succesfull return. We do not care if copy_process() fails, uprobe_free_utask() won't be called in this case so the wrong ->utask != NULL doesn't matter. OTOH, with this change we know that copy_process() can't fail when uprobe_copy_process() is called, the new task should either return to user-mode or call do_exit(). This way uprobe_copy_process() can: 1. setup p->utask != NULL if necessary 2. setup uprobes_state.xol_area 3. use task_work_add(p) Also, move the definition of uprobe_copy_process() down so that it can see get_utask(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/uprobes.c16
-rw-r--r--kernel/fork.c2
2 files changed, 9 insertions, 9 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index ad8e1bdca70e..db7a1dcb3dd6 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1345,14 +1345,6 @@ void uprobe_free_utask(struct task_struct *t)
}
/*
- * Called in context of a new clone/fork from copy_process.
- */
-void uprobe_copy_process(struct task_struct *t)
-{
- t->utask = NULL;
-}
-
-/*
* Allocate a uprobe_task object for the task if if necessary.
* Called when the thread hits a breakpoint.
*
@@ -1368,6 +1360,14 @@ static struct uprobe_task *get_utask(void)
}
/*
+ * Called in context of a new clone/fork from copy_process.
+ */
+void uprobe_copy_process(struct task_struct *t)
+{
+ t->utask = NULL;
+}
+
+/*
* Current area->vaddr notion assume the trampoline address is always
* equal area->vaddr.
*
diff --git a/kernel/fork.c b/kernel/fork.c
index 086fe73ad6bd..d3603b81246b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1373,7 +1373,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
INIT_LIST_HEAD(&p->pi_state_list);
p->pi_state_cache = NULL;
#endif
- uprobe_copy_process(p);
/*
* sigaltstack should be cleared when sharing the same VM
*/
@@ -1490,6 +1489,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
perf_event_fork(p);
trace_task_newtask(p, clone_flags);
+ uprobe_copy_process(p);
return p;