From: Oleg Nesterov <oleg@redhat.com>
Date: Fri, 8 Nov 2013 15:35:55 +0000 (+0100)
Subject: uprobes: Fix the wrong usage of current->utask in uprobe_copy_process()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=70d7f98722a7a1df1a55d6a92d0ce959c7aba9fd;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

uprobes: Fix the wrong usage of current->utask in uprobe_copy_process()

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 <oleg@redhat.com>
---

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 0ac346ae5edb..5e5695038d2d 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1447,7 +1447,7 @@ 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);
 }