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[198.162.52.65]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84f5a552859sm172922b3a.42.2026.08.06.17.44.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 06 Aug 2026 17:44:09 -0700 (PDT) From: Ning Ding To: bpf@vger.kernel.org Cc: memxor@gmail.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, shuah@kernel.org, Ning Ding Subject: [PATCH bpf-next 1/2] bpf: Compare iterator types during state pruning Date: Thu, 6 Aug 2026 17:43:19 -0700 Message-ID: <20260807004320.134069-2-dingning04@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260807004320.134069-1-dingning04@gmail.com> References: <20260807004320.134069-1-dingning04@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit An iterator stack slot can be MEM_RCU or PTR_UNTRUSTED. These states must not be equal, or the verifier can prune an unsafe path. Compare the pointer type for STACK_ITER slots. Fixes: dfab99df147b ("bpf: teach the verifier to enforce css_iter and task_iter in RCU CS") Signed-off-by: Ning Ding --- kernel/bpf/states.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/states.c b/kernel/bpf/states.c index ea2153cf28d0a..4e6aafad33bd2 100644 --- a/kernel/bpf/states.c +++ b/kernel/bpf/states.c @@ -812,7 +812,8 @@ static bool stacksafe(struct bpf_verifier_env *env, struct bpf_func_state *old, * infinite loop check triggering, see * iter_active_depths_differ() */ - if (old_reg->iter.btf != cur_reg->iter.btf || + if (old_reg->type != cur_reg->type || + old_reg->iter.btf != cur_reg->iter.btf || old_reg->iter.btf_id != cur_reg->iter.btf_id || old_reg->iter.state != cur_reg->iter.state || /* ignore {old_reg,cur_reg}->iter.depth, see above */ -- 2.43.0