From patchwork Sun Sep 15 02:11:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Xu X-Patchwork-Id: 13804632 Received: from fhigh5-smtp.messagingengine.com (fhigh5-smtp.messagingengine.com [103.168.172.156]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E3EE10A0C; Sun, 15 Sep 2024 02:11:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=103.168.172.156 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726366294; cv=none; b=dZDXayB3nyYio/STAOlR9a2K2pz3ITP/EXQ4bgm0fuwhTDHi1LqjdYqBDkq8cxiDNLpHzIhtTIX7yUDnB+Ocj+QxCJ3g9JkuCzkRKc4w05LPxsoLGIuyFWVSSEQtsFBgDon0LGPWaJ8/sOtp547UGR8VnHKOYN8QNdt9a+eqIJw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726366294; c=relaxed/simple; bh=g7juDejI7eJN79EEGNSXhjN9Y+JkFquiwa2q2bWnyKM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YoMzNo25aF1NaS1P9yV7NnWt0LpzAuCX4ahrDS7/loZzZ+bvR1oH8pV0SaeYGOWJ7NMJjSekhO86FztEgWBB69UdgiuvXK79vPS8PceE2+ldToZPUtm0cLZI1MX7AaAGqmBx1veAivlcLgTd/Q8dnqC/L0Cqa7tu5eoVY0HB9e4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dxuuu.xyz; spf=pass smtp.mailfrom=dxuuu.xyz; dkim=pass (2048-bit key) header.d=dxuuu.xyz header.i=@dxuuu.xyz header.b=Y1F8qNed; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b=iXl8SMYr; arc=none smtp.client-ip=103.168.172.156 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=dxuuu.xyz Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=dxuuu.xyz Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dxuuu.xyz header.i=@dxuuu.xyz header.b="Y1F8qNed"; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="iXl8SMYr" Received: from phl-compute-11.internal (phl-compute-11.phl.internal [10.202.2.51]) by mailfhigh.phl.internal (Postfix) with ESMTP id 1122E114008B; Sat, 14 Sep 2024 22:11:32 -0400 (EDT) Received: from phl-mailfrontend-02 ([10.202.2.163]) by phl-compute-11.internal (MEProxy); Sat, 14 Sep 2024 22:11:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dxuuu.xyz; h=cc :cc:content-transfer-encoding:content-type:date:date:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to; s=fm3; t=1726366292; x= 1726452692; bh=x9ZpRYM8kHS0muDHL06dw8EZ3cVcPCsBaorwNhHXrgo=; b=Y 1F8qNedlpVN08nzHcuDs3jG6q+tBuVupSXBPCbIDbMT/sUQBdaYVGFsD+hrxPvVb JVOTDumh3hjFSdpn5OcqlACjZVmZK4q03Jskd1qsqIU56/3GYy1aRBVwmpPbLZhl 7Ztvd9wXaSLwo3Mxy/D9iqrWyX6Z9AOVzMzP8jycjXO02u3v/NVjmcW0o/BTH3sc hl9dfpuV214cnqVu6f2bFmHUMrkYAR2npio03f1YgP1Se4UE00i6nJFgo2PjIV2W tEMzc/fE9ymjxNnaT/YtZaERlmDxFNyqQmVQaDSUR3wuFvPW4dcQ/nGNucZVSHR+ 3itt7HFjJ2bYJfU6/6thw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:date:date:feedback-id:feedback-id:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to:x-me-proxy:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm1; t=1726366292; x= 1726452692; bh=x9ZpRYM8kHS0muDHL06dw8EZ3cVcPCsBaorwNhHXrgo=; b=i Xl8SMYryWT4WoauTDCvC2Rft4KffX4DW/oj2ncBXKMIN91KUSTmOU8i0p7Z88Bah q6Mm7oNN0rTJMYXYYUfkpglwmMQAt+pqAXIrKYuwhk4qFI2eKqXDDPChhnXJOJoh deFD28Og60wTF2/tGHhbIAj2ZLiaPvgvrmBMQPvrLBQ+ka3yA99ZwwCYkcqyGi55 v7mfElMBy6mDqIt2Z7gQlJt9CXoS/DONb8XgAfQotSgIBt7xSy/Ao0DOk8XMnqQZ R/H4/2JW0mZi0qe1ibsY8aK/uTkkcIFHrfpgJn3hzFBm0hVEYrNoIFwOxtUypSTq DD1nUzzBDQExADKL9Ixzw== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeftddrudekuddgheejucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggvpdfu rfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucgfrhhlucfvnfffucdlje dtmdenucfjughrpefhvfevufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpeff rghnihgvlhcuighuuceougiguhesugiguhhuuhdrgiihiieqnecuggftrfgrthhtvghrnh epgfefgfegjefhudeikedvueetffelieefuedvhfehjeeljeejkefgffeghfdttdetnecu vehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepugiguhesug iguhhuuhdrgiihiidpnhgspghrtghpthhtohepudekpdhmohguvgepshhmthhpohhuthdp rhgtphhtthhopehshhhurghhsehkvghrnhgvlhdrohhrghdprhgtphhtthhopegrnhgurh hiiheskhgvrhhnvghlrdhorhhgpdhrtghpthhtoheprghstheskhgvrhhnvghlrdhorhhg pdhrtghpthhtohepuggrnhhivghlsehiohhgvggrrhgsohigrdhnvghtpdhrtghpthhtoh epvgguugihiiekjeesghhmrghilhdrtghomhdprhgtphhtthhopehmhihkohhlrghlsehf sgdrtghomhdprhgtphhtthhopehmrghrthhinhdrlhgruheslhhinhhugidruggvvhdprh gtphhtthhopehsohhngheskhgvrhhnvghlrdhorhhgpdhrtghpthhtohephihonhhghhho nhhgrdhsohhngheslhhinhhugidruggvvh X-ME-Proxy: Feedback-ID: i6a694271:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Sat, 14 Sep 2024 22:11:28 -0400 (EDT) From: Daniel Xu To: shuah@kernel.org, andrii@kernel.org, ast@kernel.org, daniel@iogearbox.net, eddyz87@gmail.com Cc: mykolal@fb.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: [PATCH bpf-next 2/2] bpf: selftests: verifier: Add nullness elision tests Date: Sat, 14 Sep 2024 20:11:12 -0600 Message-ID: <55d878b5b9ee0daef9e19f7c5e13cd78d96a59cd.1726366145.git.dxu@dxuuu.xyz> X-Mailer: git-send-email 2.46.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Test that nullness elision works for common use cases. For example, we want to check that both full and subreg stack slots recognized. As well as multiple lookups. And obviously some bound checks. Signed-off-by: Daniel Xu --- .../bpf/progs/verifier_array_access.c | 143 ++++++++++++++++++ 1 file changed, 143 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_array_access.c b/tools/testing/selftests/bpf/progs/verifier_array_access.c index 95d7ecc12963..85bf50750a8e 100644 --- a/tools/testing/selftests/bpf/progs/verifier_array_access.c +++ b/tools/testing/selftests/bpf/progs/verifier_array_access.c @@ -28,6 +28,20 @@ struct { __uint(map_flags, BPF_F_WRONLY_PROG); } map_array_wo SEC(".maps"); +struct { + __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); + __uint(max_entries, 2); + __type(key, int); + __type(value, struct test_val); +} map_array_pcpu SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 2); + __type(key, int); + __type(value, struct test_val); +} map_array SEC(".maps"); + struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(max_entries, 1); @@ -526,4 +540,133 @@ l0_%=: exit; \ : __clobber_all); } +SEC("socket") +__description("valid map access into an array using constant without nullness") +__success +__retval(4) +__naked void an_array_with_a_constant_no_nullness(void) +{ + asm volatile (" \ + r1 = 1; \ + *(u64*)(r10 - 8) = r1; \ + r2 = r10; \ + r2 += -8; \ + r1 = %[map_array] ll; \ + call %[bpf_map_lookup_elem]; \ + r1 = %[test_val_foo]; \ + *(u64*)(r0 + 0) = r1; \ + r0 = *(u64*)(r0 + 0); \ + exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_addr(map_array), + __imm_const(test_val_foo, offsetof(struct test_val, foo)) + : __clobber_all); +} + +SEC("socket") +__description("valid multiple map access into an array using constant without nullness") +__success +__retval(8) +__naked void multiple_array_with_a_constant_no_nullness(void) +{ + asm volatile (" \ + r1 = 1; \ + *(u64*)(r10 - 8) = r1; \ + r2 = r10; \ + r2 += -8; \ + r1 = %[map_array] ll; \ + call %[bpf_map_lookup_elem]; \ + r6 = %[test_val_foo]; \ + *(u64*)(r0 + 0) = r6; \ + r7 = *(u64*)(r0 + 0); \ + r1 = 0; \ + *(u64*)(r10 - 16) = r1; \ + r2 = r10; \ + r2 += -16; \ + r1 = %[map_array] ll; \ + call %[bpf_map_lookup_elem]; \ + *(u64*)(r0 + 0) = r6; \ + r1 = *(u64*)(r0 + 0); \ + r7 += r1; \ + r0 = r7; \ + exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_addr(map_array), + __imm_const(test_val_foo, offsetof(struct test_val, foo)) + : __clobber_all); +} + +SEC("socket") +__description("valid map access into an array using 32-bit constant without nullness") +__success +__retval(4) +__naked void an_array_with_a_32bit_constant_no_nullness(void) +{ + asm volatile (" \ + r1 = 1; \ + *(u32*)(r10 - 4) = r1; \ + r2 = r10; \ + r2 += -4; \ + r1 = %[map_array] ll; \ + call %[bpf_map_lookup_elem]; \ + r1 = %[test_val_foo]; \ + *(u64*)(r0 + 0) = r1; \ + r0 = *(u64*)(r0 + 0); \ + exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_addr(map_array), + __imm_const(test_val_foo, offsetof(struct test_val, foo)) + : __clobber_all); +} + +SEC("socket") +__description("valid map access into a pcpu array using constant without nullness") +__success +__retval(4) +__naked void a_pcpu_array_with_a_constant_no_nullness(void) +{ + asm volatile (" \ + r1 = 1; \ + *(u64*)(r10 - 8) = r1; \ + r2 = r10; \ + r2 += -8; \ + r1 = %[map_array_pcpu] ll; \ + call %[bpf_map_lookup_elem]; \ + r1 = %[test_val_foo]; \ + *(u64*)(r0 + 0) = r1; \ + r0 = *(u64*)(r0 + 0); \ + exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_addr(map_array_pcpu), + __imm_const(test_val_foo, offsetof(struct test_val, foo)) + : __clobber_all); +} + +SEC("socket") +__description("invalid map access into an array using constant without nullness") +__failure __msg("R0 invalid mem access 'map_value_or_null'") +__naked void an_array_with_a_constant_no_nullness_out_of_bounds(void) +{ + asm volatile (" \ + r1 = 3; \ + *(u64*)(r10 - 8) = r1; \ + r2 = r10; \ + r2 += -8; \ + r1 = %[map_array] ll; \ + call %[bpf_map_lookup_elem]; \ + r1 = %[test_val_foo]; \ + *(u64*)(r0 + 0) = r1; \ + r0 = *(u64*)(r0 + 0); \ + exit; \ +" : + : __imm(bpf_map_lookup_elem), + __imm_addr(map_array), + __imm_const(test_val_foo, offsetof(struct test_val, foo)) + : __clobber_all); +} + char _license[] SEC("license") = "GPL";