Commit aa59c53fd459 "uprobes: Change uprobe_copy_process() to dup xol_area" has a stupid typo, we need to setup t->utask->vaddr but the code wrongly uses current->utask.
Even with this bug dup_xol_work() works "in practice", but only because get_unmapped_area(NULL, TASK_SIZE - PAGE_SIZE) likely returns the same address every time. Signed-off-by: Oleg Nesterov <[email protected]> --- kernel/events/uprobes.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 26fdd65..847201f 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1446,7 +1446,7 @@ void uprobe_copy_process(struct task_struct *t, unsigned long flags) if (!work) return uprobe_warn(t, "dup xol area"); - utask->vaddr = area->vaddr; + t->utask->vaddr = area->vaddr; init_task_work(work, dup_xol_work); task_work_add(t, work, true); } -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
