From: Pasha Tatashin <pasha.tatashin@soleen.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>,
Miaohe Lin <linmiaohe@huawei.com>,
David Rientjes <rientjes@google.com>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm/page_table_check: fix accessing unmapped ptep
Date: Thu, 26 May 2022 14:31:06 -0400 [thread overview]
Message-ID: <CA+CK2bBJ3baj2Qt+9Wy1r==_Uym_UZJ+S-HRwFAsspPamctk_Q@mail.gmail.com> (raw)
In-Reply-To: <20220526111546.50102da288cccbe913cadbf4@linux-foundation.org>
> > Miaohe, please store the ptep, or maybe drop this patch entirely.
>
> I think it's best to fix it. I rewrote the changelog as
>
> : ptep is unmapped too early, so ptep could theoretically be accessed while
> : it's unmapped. This might become a problem if/when CONFIG_HIGHPTE becomes
> : available on riscv.
> :
> : Fix it by deferring pte_unmap() until page table checking is done.
>
> I'll retain the Fixes:. This doesn't imply cc:stable in MM, and anyone
> who backports the original patchset will want to know about this fixup.
Makes sense.
> And I queued a fixup for the thing Matthew noticed.
Thank you Andrew.
Pasha
next prev parent reply other threads:[~2022-05-26 18:31 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-26 11:33 Miaohe Lin
2022-05-26 13:04 ` Qi Zheng
2022-05-26 13:11 ` Pasha Tatashin
2022-05-26 13:23 ` Qi Zheng
2022-05-26 13:17 ` Pasha Tatashin
2022-05-26 13:34 ` Matthew Wilcox
2022-05-26 13:37 ` Pasha Tatashin
2022-05-26 18:15 ` Andrew Morton
2022-05-26 18:31 ` Pasha Tatashin [this message]
2022-05-27 1:10 ` Miaohe Lin
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