linux-kernel - [PATCH 5.19 046/101] mm,hwpoison: check mm when killing accessing process

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Date:   Mon,  3 Oct 2022 09:10:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shuai Xue <xueshuai@...ux.alibaba.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        Huang Ying <ying.huang@...el.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Bixuan Cui <cuibixuan@...ux.alibaba.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 5.19 046/101] mm,hwpoison: check mm when killing accessing process

From: Shuai Xue <xueshuai@...ux.alibaba.com>

commit 77677cdbc2aa4b5d5d839562793d3d126201d18d upstream.

The GHES code calls memory_failure_queue() from IRQ context to queue work
into workqueue and schedule it on the current CPU.  Then the work is
processed in memory_failure_work_func() by kworker and calls
memory_failure().

When a page is already poisoned, commit a3f5d80ea401 ("mm,hwpoison: send
SIGBUS with error virutal address") make memory_failure() call
kill_accessing_process() that:

    - holds mmap locking of current->mm
    - does pagetable walk to find the error virtual address
    - and sends SIGBUS to the current process with error info.

However, the mm of kworker is not valid, resulting in a null-pointer
dereference.  So check mm when killing the accessing process.

[akpm@...ux-foundation.org: remove unrelated whitespace alteration]
Link: https://lkml.kernel.org/r/20220914064935.7851-1-xueshuai@linux.alibaba.com
Fixes: a3f5d80ea401 ("mm,hwpoison: send SIGBUS with error virutal address")
Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@....com>
Cc: Huang Ying <ying.huang@...el.com>
Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: Bixuan Cui <cuibixuan@...ux.alibaba.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 mm/memory-failure.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -697,6 +697,9 @@ static int kill_accessing_process(struct
 	};
 	priv.tk.tsk = p;
 
+	if (!p->mm)
+		return -EFAULT;
+
 	mmap_read_lock(p->mm);
 	ret = walk_page_range(p->mm, 0, TASK_SIZE, &hwp_walk_ops,
 			      (void *)&priv);