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([184.144.109.221]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8ffd50e3083sm20418136d6.6.2026.07.09.08.58.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jul 2026 08:58:53 -0700 (PDT) From: Nicholas Dudar To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com Subject: [PATCH bpf-next v2 0/2] bpf: bound rdonly/rdwr_buf_size kfunc return size Date: Thu, 9 Jul 2026 11:58:35 -0400 Message-Id: <20260709155837.1879230-1-main.kalliope@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit check_kfunc_args() stores a kfunc's rdonly_buf_size/rdwr_buf_size argument into a u64 that check_kfunc_call() later narrows into the returned register's u32 mem_size, so a value above U32_MAX truncates instead of being rejected. Fix it and add a selftest for coverage. Changelog: ---------- v1 -> v2 (v1 was a private report to security@kernel.org) * Split the fix and selftest into separate patches. * Target bpf-next instead of bpf. Nicholas Dudar (2): bpf: reject rdonly/rdwr_buf_size kfunc arguments that exceed u32 max selftests/bpf: add test for oversized rdonly/rdwr_buf_size kfunc argument kernel/bpf/verifier.c | 5 +++ .../selftests/bpf/prog_tests/kfunc_call.c | 1 + .../selftests/bpf/progs/kfunc_call_fail.c | 33 +++++++++++++++++++ 3 files changed, 39 insertions(+) base-commit: 36ffa86c42f91c8a57071e024afc4ffb51a8958f -- 2.34.1