From: Pratyush Yadav <pratyush@kernel.org>
To: Yifei Chu <yifeichu24@gmail.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>,
Mike Rapoport <rppt@kernel.org>,
linux-kernel@vger.kernel.org,
Pratyush Yadav <pratyush@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Alexander Graf <graf@amazon.com>,
linux-mm@kvack.org, kexec@lists.infradead.org
Subject: Re: [BUG] liveupdate: incoming/outgoing session ioctls accepted in wrong phase can panic
Date: Mon, 25 May 2026 17:26:51 +0200 [thread overview]
Message-ID: <2vxzjysr7bno.fsf@kernel.org> (raw)
In-Reply-To: <CAPJnbgLtEUQ4Kv1ENM4ku0S0JFS8T49MEHFa4MpoT3WRuuVfFA@mail.gmail.com> (Yifei Chu's message of "Sun, 24 May 2026 10:44:31 -0400")
On Sun, May 24 2026, Yifei Chu wrote:
> Hello,
>
> Short version: I found that liveupdate session ioctls can be accepted on the wrong kind of session. In my tests, that
> lets userspace drive memfd LUO into KHO restore paths for current-kernel preserved memory, which hits kho_restore_page()
> warnings and panics with panic_on_warn=1.
I already sent a fix for this:
https://lore.kernel.org/kexec/20260519122428.2378446-1-pratyush@kernel.org/
I need to do a refresh of this patch with some tests.
--
Regards,
Pratyush Yadav
next prev parent reply other threads:[~2026-05-25 15:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-24 14:44 [BUG] liveupdate: incoming/outgoing session ioctls accepted in wrong phase can panic Yifei Chu
2026-05-25 15:26 ` Pratyush Yadav [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-05-24 17:31 Yifei Chu
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