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([2620:10d:c090:600::1:e6e1]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-31e51a66d1bsm96285a91.27.2025.07.22.14.38.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Jul 2025 14:38:40 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf-next v2 2/2] selftests/bpf: Test invalid narrower ctx load From: Eduard Zingerman To: Paul Chaignon , bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , John Fastabend Date: Tue, 22 Jul 2025 14:38:38 -0700 In-Reply-To: <44cd83ea9c6868079943f0a436c6efa850528cc1.1753194596.git.paul.chaignon@gmail.com> References: <3b8dcee67ff4296903351a974ddd9c4dca768b64.1753194596.git.paul.chaignon@gmail.com> <44cd83ea9c6868079943f0a436c6efa850528cc1.1753194596.git.paul.chaignon@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2025-07-22 at 16:33 +0200, Paul Chaignon wrote: > This patch adds selftests to cover invalid narrower loads on the > context. These used to cause kernel warnings before the previous patch. > To trigger the warning, the load had to be aligned, to read an affected > context field (ex., skb->sk), and not starting at the beginning of the > field. >=20 > The nine new cases all fail without the previous patch. >=20 > Suggested-by: Eduard Zingerman > Signed-off-by: Paul Chaignon > --- > Changes in v2: > - Cover all affected fields, via a macro, as suggested by Eduard. Acked-by: Eduard Zingerman [...]