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[27.53.97.40]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2cf8efd80cfsm23869135ad.25.2026.07.22.19.42.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Jul 2026 19:42:57 -0700 (PDT) Date: Thu, 23 Jul 2026 10:42:52 +0800 From: Shung-Hsi Yu To: Greg KH Cc: Sasha Levin , stable@vger.kernel.org, Puranjay Mohan Subject: Re: [PATCH stable 6.18 0/6] bpf: verifier: linked register tests and fixes Message-ID: References: <20260717044731.121353-1-shung-hsi.yu@suse.com> <20260718192718.0008-stable-reply@kernel.org> <2026072146-apple-condone-0ef6@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2026072146-apple-condone-0ef6@gregkh> On Tue, Jul 21, 2026 at 12:18:03PM +0200, Greg KH wrote: > On Tue, Jul 21, 2026 at 02:45:15PM +0800, Shung-Hsi Yu wrote: > > On Sun, Jul 19, 2026 at 11:00:22AM -0400, Sasha Levin wrote: > > > > This patchset mainly aims to backport upstream commit 1b327732c846 > > > > ("bpf: Clear delta when clearing reg id for non-{add,sub} ops") (patch > > > > 4), and its selftests patch in commit cac16ce1e378 ("selftests/bpf: Add > > > > tests for stale delta leaking through id reassignment") (patch 6). > > > > > > Queued the series for 6.18, thanks. > > > > Hi Sasha, > > > > I realized that we have commit b0388bafa494 ("verifier: Relax scalar id > > equivalence for state pruning"), but not the preceeding commits in the > > same patchset[1]. I not certain that b0388bafa494 is expected to work in > > isolation without the two previous one: > > - 3cd5c890652b bpf: verifier: Assign ids on stack fills > > - b2a0aa3a8739 bpf: verifier: Clear singular ids for scalars > > > > I going with the conservative approach of reverting b0388bafa494. > > However that also means that commit 1b327732c846 "bpf: Clear delta when > > clearing reg id for non-{add,sub} ops" will no longer apply cleanly. Let > > me send a v2 to address this whole thing. > > > > 1: https://lore.kernel.org/all/20260203165102.2302462-1-puranjay@kernel.org/ > > > > So should we drop all of these from the 6.18 queue at this point in > time? No need. These should be good. Thanks for including them in 6.18.40-rc. Thanks, Shung-Hsi