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Wed, 05 Aug 2026 01:01:02 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf-next v3 9/9] selftests/bpf: Test stack-passed struct_ops arena arguments From: Eduard Zingerman To: Kumar Kartikeya Dwivedi , bpf@vger.kernel.org Cc: Tejun Heo , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Emil Tsalapatis , kkd@meta.com, kernel-team@meta.com Date: Wed, 05 Aug 2026 01:00:59 -0700 In-Reply-To: <20260803125115.2264733-10-memxor@gmail.com> References: <20260803125115.2264733-1-memxor@gmail.com> <20260803125115.2264733-10-memxor@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-10 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-08-03 at 14:51 +0200, Kumar Kartikeya Dwivedi wrote: > From: Tejun Heo >=20 > Add a test_arena_stack member with eight leading scalar arguments so the > arena pointer is passed on the stack. >=20 > The callback validates the first and last scalar ctx slots before > dereferencing the pointer in ctx[8]. This exercises the indirect > trampoline stack layout and arena conversion together, and prevents a > regression where stack arguments are read one slot late. >=20 > Signed-off-by: Tejun Heo > Signed-off-by: Kumar Kartikeya Dwivedi > --- Tested-by: Eduard Zingerman