From patchwork Mon Jan 8 20:52:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Mikityanskiy X-Patchwork-Id: 760969 Received: from mail-ej1-f54.google.com (mail-ej1-f54.google.com [209.85.218.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0856355776; Mon, 8 Jan 2024 20:53:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="WOrlTbdq" Received: by mail-ej1-f54.google.com with SMTP id a640c23a62f3a-a28fb463a28so225042866b.3; Mon, 08 Jan 2024 12:53:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1704747200; x=1705352000; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=FHtIR9EAB6yZ4OYaEE1Ew9mP0VH0SKAUUWk1oh8IBPI=; b=WOrlTbdqmnn6BIVElRBMLnuRDE04eT81re+o+ob55RxcIKolX0ItHxBTqi2UNr7y1l 9fzqqjBZeCsMZJMD6NJHqo0TiTBAsO41zh1wF3ygvaWaXAhL6oGcx/HrgNO4vgW9YvJ/ t83Pnw1jWmRlisi8mcZIK1cCNbYnh9EA0gls/WtQgS41HUImD2tHHxKrAt1M50EzyRQK M7NakBY7izXXK1R7OfmJkqnkFVOvf80yoXMCLxFWvwVtGJZoPnlWXTr3OEJo4w6BRaaJ GXTOFqXck/u39jhvbAcoE/W6UDgSSynVF8JL9sx4G6C0AvwCTsZCy15LP8QKgxa9Qk1J LvjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704747200; x=1705352000; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=FHtIR9EAB6yZ4OYaEE1Ew9mP0VH0SKAUUWk1oh8IBPI=; b=CACDRE96ralVqRr+2HZqGb6dTM7aEKcDBFK6d/RBXlxk5sqBZwn/dFux8hcdSuHcwb F5miszT3uKbrssy50M8D0ZpSKRI7EiZhegMv+nBazBSMDoMvGikl5RP3OuDaDL4ctI2P +4CajVHoDH+ijd9JCo+VoRb2mMy7q019V650b7pWLfueRKns88NpacXSu4x5QeP/RiiD ieEJrmDMJjQW2N6VUg5hL52wcJ2/eUfGZeZTcB06Kk7eWd2axhUoiGgK02o6dSnLHiTF UWwz8cOe3oR3xLcEFu/u2XPsIq7vHBATrfTXERoSSdLrFo0aF0RRbjuxLp1As9LLCaKP qCHQ== X-Gm-Message-State: AOJu0YyguXWxQniqxJiImV5J5Tj8WB0cuyXdOILXCFZfTd7GydhTTnHz kDnc+t2vikjNPDYb8YYGV0o= X-Google-Smtp-Source: AGHT+IGJoMCX9W+pG0MMsn3NOMoijN9+KI8+bd7cS8LWg2qUPDRn3c1WMcmewJWaAgqVMwChqzwHVA== X-Received: by 2002:a17:907:7615:b0:a27:e0ae:99a8 with SMTP id jx21-20020a170907761500b00a27e0ae99a8mr10292ejc.145.1704747200306; Mon, 08 Jan 2024 12:53:20 -0800 (PST) Received: from localhost ([185.220.101.80]) by smtp.gmail.com with ESMTPSA id p11-20020a170906140b00b00a26b3f29f3dsm248401ejc.43.2024.01.08.12.53.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jan 2024 12:53:20 -0800 (PST) From: Maxim Mikityanskiy To: Eduard Zingerman , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Shung-Hsi Yu Cc: John Fastabend , Martin KaFai Lau , Song Liu , Yonghong Song , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, netdev@vger.kernel.org, Maxim Mikityanskiy Subject: [PATCH bpf-next v2 11/15] selftests/bpf: Test tracking spilled unbounded scalars Date: Mon, 8 Jan 2024 22:52:05 +0200 Message-ID: <20240108205209.838365-12-maxtram95@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240108205209.838365-1-maxtram95@gmail.com> References: <20240108205209.838365-1-maxtram95@gmail.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Maxim Mikityanskiy The previous commit added tracking for unbounded scalars on spill. Add the test case to check the new functionality. Signed-off-by: Maxim Mikityanskiy Acked-by: Eduard Zingerman --- .../selftests/bpf/progs/verifier_spill_fill.c | 27 +++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_spill_fill.c b/tools/testing/selftests/bpf/progs/verifier_spill_fill.c index 57eb70e100a3..cc6c5a3b464b 100644 --- a/tools/testing/selftests/bpf/progs/verifier_spill_fill.c +++ b/tools/testing/selftests/bpf/progs/verifier_spill_fill.c @@ -899,4 +899,31 @@ l0_%=: r0 = 0; \ : __clobber_all); } +SEC("xdp") +__description("spill unbounded reg, then range check src") +__success __retval(0) +__naked void spill_unbounded(void) +{ + asm volatile (" \ + /* Produce an unbounded scalar. */ \ + call %[bpf_get_prandom_u32]; \ + /* Spill r0 to stack. */ \ + *(u64*)(r10 - 8) = r0; \ + /* Boundary check on r0. */ \ + if r0 > 16 goto l0_%=; \ + /* Fill r0 from stack. */ \ + r0 = *(u64*)(r10 - 8); \ + /* Boundary check on r0 with predetermined result. */\ + if r0 <= 16 goto l0_%=; \ + /* Dead branch: the verifier should prune it. Do an invalid memory\ + * access if the verifier follows it. \ + */ \ + r0 = *(u64*)(r9 + 0); \ +l0_%=: r0 = 0; \ + exit; \ +" : + : __imm(bpf_get_prandom_u32) + : __clobber_all); +} + char _license[] SEC("license") = "GPL";