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[54.240.197.231]) by smtp.gmail.com with ESMTPSA id bs3-20020a056000070300b0033d4c3b0beesm23297364wrb.19.2024.03.08.04.07.26 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 08 Mar 2024 04:07:26 -0800 (PST) From: Puranjay Mohan To: Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , bpf@vger.kernel.org, linux-kernel@vger.kernel.org Cc: puranjay12@gmail.com Subject: [PATCH bpf-next] bpf: cap BPF_PROG_PACK_SIZE to 2MB * num_possible_nodes() Date: Fri, 8 Mar 2024 12:07:12 +0000 Message-Id: <20240308120712.88122-1-puranjay12@gmail.com> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On some architectures like ARM64, PMD_SIZE can be really large in some configurations. Like with CONFIG_ARM64_64K_PAGES=y the PMD_SIZE is 512MB. Use 2MB * num_possible_nodes() as the upper limit for allocations done through the prog pack allocator. Fixes: ea2babac63d4 ("bpf: Simplify bpf_prog_pack_[size|mask]") Reported-by: "kernelci.org bot" Closes: https://lore.kernel.org/all/7e216c88-77ee-47b8-becc-a0f780868d3c@sirena.org.uk/ Suggested-by: Song Liu Signed-off-by: Puranjay Mohan --- kernel/bpf/core.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 134b7979f537..83a3b6964e54 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -893,8 +893,17 @@ static LIST_HEAD(pack_list); * CONFIG_MMU=n. Use PAGE_SIZE in these cases. */ #ifdef PMD_SIZE +/* + * PMD_SIZE is really big for some archs. It doesn't make sense to + * reserve too much memory in one allocation. Cap BPF_PROG_PACK_SIZE to + * 2MiB * num_possible_nodes(). + */ +#if PMD_SIZE <= (1 << 21) #define BPF_PROG_PACK_SIZE (PMD_SIZE * num_possible_nodes()) #else +#define BPF_PROG_PACK_SIZE ((1 << 21) * num_possible_nodes()) +#endif +#else #define BPF_PROG_PACK_SIZE PAGE_SIZE #endif -- 2.40.1