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([2620:10d:c090:500::d8d4]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-12c4b323428sm12395806c88.4.2026.04.14.11.32.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Apr 2026 11:32:23 -0700 (PDT) Message-ID: <2aaf049fdd735f642f470ca6b0822bddf07a5eff.camel@gmail.com> Subject: Re: [PATCH 1/2] bpf: deduce_bounds_64_from_32 tightening with circular range logic From: Eduard Zingerman To: Helen Koike , Shung-Hsi Yu Cc: andrii@kernel.org, yonghong.song@linux.dev, ast@kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-dev@igalia.com Date: Tue, 14 Apr 2026 11:32:20 -0700 In-Reply-To: References: <20260410124035.297632-1-koike@igalia.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-04-14 at 13:25 -0300, Helen Koike wrote: > Hi Shung-Hsi Yu, >=20 >=20 > Thanks for your reply, >=20 > On 4/14/26 5:26 AM, Shung-Hsi Yu wrote: > > Hi Helen, > >=20 > > On Fri, Apr 10, 2026 at 09:40:27AM -0300, Helen Koike wrote: > > ... > > > This is a follow-up from discussion: > > > https://lore.kernel.org/all/7fb97184-baaa-4639-a0b9-ac289bf2e54d@i= galia.com/ > >=20 > > Base on the original thread, I see that motivation of the patchset came > > from a Syzkaller reported issue[1]. Can you try to run the reproducer > > again and see if you can still get it to reproduce on the bpf-next tree= ? >=20 > I just tested on bpf-next/master ("71b500afd2f7") and I couldn't=20 > reproduce the issue from Syzbot anymore. It seems that the branch=20 > causing the issue is pruned now, fixing the error in that case. >=20 > But I still get the failures of the kselftests from patch 2/2: >=20 > * verifier_bounds/deduce64_from_32_block_change:FAIL > * verifier_bounds/deduce64_from_32_block_change_signed:FAIL > *=20 > verifier_bounds/deduce64_from_32_block_change_conservative_signed:FAIL > * verifier_bounds/deduce64_from_32_wrapping_32bit:FAIL >=20 >=20 > How do you suggest we should proceed? >=20 I still want this for the sake of improved value tracking. Please give me a bit more time for review.