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Message-ID: <20131108155735.GB26611@redhat.com> Date: Fri, 8 Nov 2013 16:57:35 +0100 From: Oleg Nesterov <oleg@...hat.com> To: Ingo Molnar <mingo@...e.hu> Cc: Anton Arapov <aarapov@...hat.com>, David Smith <dsmith@...hat.com>, "Frank Ch. Eigler" <fche@...hat.com>, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, linux-kernel@...r.kernel.org Subject: [PATCH 1/1] 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@...hat.com> --- 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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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