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([2620:10d:c090:500::3:1322]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-137f553ab33sm15118442c88.10.2026.06.09.09.47.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jun 2026 09:47:44 -0700 (PDT) Message-ID: Subject: Re: [PATCH bpf] selftests/bpf: Add BTF repeated field count overflow test From: Eduard Zingerman To: Paul Moses , martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, memxor@gmail.com, bpf@vger.kernel.org Cc: song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, houtao1@huawei.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org Date: Tue, 09 Jun 2026 09:47:41 -0700 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.1 (3.60.1-1.fc44) Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-06-09 at 11:37 +0000, Paul Moses wrote: > From 7129e266643883a4f83e65fce3ce20c7f7269fb3 Mon Sep 17 00:00:00 2001 > From: Paul Moses > Date: Tue, 9 Jun 2026 05:08:54 -0500 > Subject: [PATCH bpf] selftests/bpf: Add BTF repeated field count overflow= test >=20 > Add a raw BTF test that exercises repeated special-field expansion with a > large array count. The compact element layout keeps the array byte size > representable while the repeated field count overflows the old u32 capaci= ty > calculation in btf_repeat_fields(). >=20 > Signed-off-by: Paul Moses > --- Note that this selftest is depending on a fix: https://lore.kernel.org/bpf/DJ4DWMO4HXCM.3NVLDGNT2704E@gmail.com/T/#t W/o the fix KASAN warning is reported when executing the test. Tested-by: Eduard Zingerman [...]