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Thu, 04 Jun 2026 08:46:39 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Thu, 04 Jun 2026 11:46:39 -0400 Message-Id: Cc: , , Subject: Re: [PATCH bpf-next] selftests/bpf: Add arena direct-value one-past-end reject test From: "Emil Tsalapatis" To: "Woojin Ji" , "Emil Tsalapatis" X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20260603-arena-direct-value-v1-v1-1-7b31cc0a8cac@gmail.com> <20260604153712.199362-1-random6.xyz@gmail.com> In-Reply-To: <20260604153712.199362-1-random6.xyz@gmail.com> On Thu Jun 4, 2026 at 11:37 AM EDT, Woojin Ji wrote: > Thanks for the review. > > I tried moving this into verifier_arena.c, but this test needs to set the > second BPF_PSEUDO_MAP_VALUE ldimm64 immediate to arena_size exactly. The > __arena C forms I checked materialize the arena-end offset as a separate = ALU > add or memory access offset instead, so they do not exercise > arena_map_direct_value_addr() with off =3D=3D arena_size. > > So v2 keeps the userspace raw-instruction test and expands the commit mes= sage > to explain why it is needed. This sounds like the problem is that we can't really get BPF C to be compiled down to problematic code. Can't we still use inline assembly in the BPF C file to do so? I don't see why not. > > v2: https://lore.kernel.org/all/20260605-arena-direct-value-v1-v2-1-a92cb= 281e376@gmail.com/