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Fri, 04 Sep 2026 17:06:24 -0700 (PDT) Received: from ezingerman-fedora-PF4V722J.thefacebook.com ([2620:10d:c090:500::5:4f3d]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3356dc5c04dsm42277eec.8.2026.09.04.17.06.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Sep 2026 17:06:24 -0700 (PDT) From: Eduard Zingerman To: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org Cc: daniel@iogearbox.net, martin.lau@linux.dev, kernel-team@fb.com, yonghong.song@linux.dev, eddyz87@gmail.com, memxor@gmail.com Subject: [PATCH bpf 06/10] selftests/bpf: precision of a NULL kfunc argument Date: Fri, 4 Sep 2026 17:05:57 -0700 Message-ID: <20260904-register-is-null-precise-fixes-v1-6-0f5a360ff15d@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904-register-is-null-precise-fixes-v1-0-0f5a360ff15d@gmail.com> References: <20260904-register-is-null-precise-fixes-v1-0-0f5a360ff15d@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Check that mark_chain_precision() is called for a NULL pointer passed as a __nullable kfunc memory argument. Signed-off-by: Eduard Zingerman --- .../selftests/bpf/progs/verifier_precision.c | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_precision.c b/tools/testing/selftests/bpf/progs/verifier_precision.c index fb7dfa1246ef..f4459561bf39 100644 --- a/tools/testing/selftests/bpf/progs/verifier_precision.c +++ b/tools/testing/selftests/bpf/progs/verifier_precision.c @@ -2,8 +2,10 @@ /* Copyright (C) 2023 SUSE LLC */ #include #include +#include #include "../../../include/linux/filter.h" #include "bpf_misc.h" +#include "bpf_kfuncs.h" struct { __uint(type, BPF_MAP_TYPE_ARRAY); @@ -708,4 +710,36 @@ __naked int null_mem_arg_global_subprog(void) : __clobber_all); } +/* Same as above, check that path with r3 == 0 does not prune the path with r3 != 0 */ +SEC("?tc") +__flag(BPF_F_TEST_STATE_FREQ) +__failure __msg("R3 type=scalar expected=fp") +int null_kfunc_arg_dynptr_slice(struct __sk_buff *skb) +{ + struct bpf_dynptr ptr; + + bpf_dynptr_from_skb(skb, 0, &ptr); + asm volatile ( + "call %[bpf_get_prandom_u32];" + "r3 = 42;" + "if r0 > 42 goto 1f;" + "r3 = 0;" + "1:" + "r1 = %[ptr];" + "r2 = 0;" + "r4 = 8;" + "call %[bpf_dynptr_slice];" + : + : __imm_ptr(ptr), + __imm(bpf_get_prandom_u32), + __imm(bpf_dynptr_slice) + : __clobber_common); + return 0; +} + +void __kfunc_btf_root(void) +{ + bpf_dynptr_slice(0, 0, 0, 0); +} + char _license[] SEC("license") = "GPL"; -- 2.55.0