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Tue, 13 Oct 2026 11:22:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791890553; bh=mtpgXdzPgdHugzEFbyFxgZF7cgPiieuUZpPezpahctY=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=PZpNke+ky9Mf0deSxyKCg4UUJbgy4KDId6WcZbWS72Gw5uU76oskxmdDSQvuFJF+Y 9iXh3+rKMIjDZK1kud0aBVXddZVH0FFcHyb+KmcFJfZKeRMLkRnhM6UG9xY/G5H/kM TLPwGprXCFampSpBhxQACcJXsYhhl/+qaKTyf9qZKYl4h/G9QMolGRahO8jYj0mEXA CP2l7avckvUe4j1+tIcK3IVjRmJsD5vJ4Qo+JrNj8q9PmTzpm8CwCrQNaAV19lwF0u 4dYr+ct2hiu0PYGUJFpKcguC0o3YExmBHFxMMmZ6HLipfZq42qTvZ9znoueyjfY9ta N6AK75rGaod+g== Date: Tue, 13 Oct 2026 13:22:28 +0200 From: Gao Xiang To: Michael Bommarito Cc: Gao Xiang , Sasha Levin , stable@vger.kernel.org, Chao Yu , linux-erofs@lists.ozlabs.org Subject: Re: Patch "erofs: remove fscache backend entirely" has been added to the 6.18-stable tree Message-ID: Mail-Followup-To: Michael Bommarito , Gao Xiang , Sasha Levin , stable@vger.kernel.org, Chao Yu , linux-erofs@lists.ozlabs.org References: <20261013020044.2527207-1-sashal@kernel.org> <20261013111011.2814836-1-michael.bommarito@gmail.com> X-Mailing-List: linux-erofs@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20261013111011.2814836-1-michael.bommarito@gmail.com> Hi Michael, On Tue, Oct 13, 2026 at 07:10:11AM -0400, Michael Bommarito wrote: > For context, the original bug I found can hit both 100% deterministic > local DoS and a textbook UAF on kmalloc-128 slab that requires timing, > but I don't think an LPE can be ruled out... > > Since it is reachable by an ordinary read() on Nydus or others that > enabled ondemand in Kconfig, I think it is worth thinking about what to > do for all of the pre-deprecation users (even if it's just comms). > > I would defer to Gao, but I sent a minimal fix in June that can > close the UAF without any other breaking changes. Do you mean this one? https://lore.kernel.org/r/20260619135800.1594811-1-michael.bommarito@gmail.com As I requested months ago, could you please provide a reproducer first so I can play with your patch. If you provide a minimal reproducer, of course we could address this in the stable kernels. Thanks, Gao Xiang > > Thanks, > Michael Bommarito >