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Tue, 19 Dec 2023 05:50:42 -0800 (PST) Received: from localhost.localdomain ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id d17-20020a056a00245100b006cddecbf432sm20695264pfj.96.2023.12.19.05.50.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Dec 2023 05:50:42 -0800 (PST) From: Menglong Dong To: andrii@kernel.org, eddyz87@gmail.com, yonghong.song@linux.dev, alexei.starovoitov@gmail.com Cc: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, martin.lau@linux.dev, song@kernel.org, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, mykolal@fb.com, shuah@kernel.org, menglong8.dong@gmail.com, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Shung-Hsi Yu Subject: [PATCH bpf-next v5 1/4] bpf: make the verifier tracks the "not equal" for regs Date: Tue, 19 Dec 2023 21:47:57 +0800 Message-Id: <20231219134800.1550388-2-menglong8.dong@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231219134800.1550388-1-menglong8.dong@gmail.com> References: <20231219134800.1550388-1-menglong8.dong@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785718511754381628 X-GMAIL-MSGID: 1785718511754381628 We can derive some new information for BPF_JNE in regs_refine_cond_op(). Take following code for example: /* The type of "a" is u32 */ if (a > 0 && a < 100) { /* the range of the register for a is [0, 99], not [1, 99], * and will cause the following error: * * invalid zero-sized read * * as a can be 0. */ bpf_skb_store_bytes(skb, xx, xx, a, 0); } In the code above, "a > 0" will be compiled to "jmp xxx if a == 0". In the TRUE branch, the dst_reg will be marked as known to 0. However, in the fallthrough(FALSE) branch, the dst_reg will not be handled, which makes the [min, max] for a is [0, 99], not [1, 99]. For BPF_JNE, we can reduce the range of the dst reg if the src reg is a const and is exactly the edge of the dst reg. Signed-off-by: Menglong Dong Acked-by: Andrii Nakryiko Acked-by: Shung-Hsi Yu --- v2: - fix a typo in the subject - add some comments, as Eduard advised --- kernel/bpf/verifier.c | 38 +++++++++++++++++++++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 1863826a4ac3..29c41d66ea6f 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -14343,7 +14343,43 @@ static void regs_refine_cond_op(struct bpf_reg_state *reg1, struct bpf_reg_state } break; case BPF_JNE: - /* we don't derive any new information for inequality yet */ + if (!is_reg_const(reg2, is_jmp32)) + swap(reg1, reg2); + if (!is_reg_const(reg2, is_jmp32)) + break; + + /* try to recompute the bound of reg1 if reg2 is a const and + * is exactly the edge of reg1. + */ + val = reg_const_value(reg2, is_jmp32); + if (is_jmp32) { + /* u32_min_value is not equal to 0xffffffff at this point, + * because otherwise u32_max_value is 0xffffffff as well, + * in such a case both reg1 and reg2 would be constants, + * jump would be predicted and reg_set_min_max() won't + * be called. + * + * Same reasoning works for all {u,s}{min,max}{32,64} cases + * below. + */ + if (reg1->u32_min_value == (u32)val) + reg1->u32_min_value++; + if (reg1->u32_max_value == (u32)val) + reg1->u32_max_value--; + if (reg1->s32_min_value == (s32)val) + reg1->s32_min_value++; + if (reg1->s32_max_value == (s32)val) + reg1->s32_max_value--; + } else { + if (reg1->umin_value == (u64)val) + reg1->umin_value++; + if (reg1->umax_value == (u64)val) + reg1->umax_value--; + if (reg1->smin_value == (s64)val) + reg1->smin_value++; + if (reg1->smax_value == (s64)val) + reg1->smax_value--; + } break; case BPF_JSET: if (!is_reg_const(reg2, is_jmp32)) From patchwork Tue Dec 19 13:47:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Menglong Dong X-Patchwork-Id: 180948 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:24d3:b0:fb:cd0c:d3e with SMTP id r19csp1948616dyi; Tue, 19 Dec 2023 05:51:56 -0800 (PST) X-Google-Smtp-Source: AGHT+IH7c38s8mqQZsvWh8Kn/k2ERJMwwNX9pQdlXh7RuusP8phn1rglV3q7J7D7bWRQoiuywWvB X-Received: by 2002:a17:906:2c6:b0:a1c:91eb:63cf with SMTP id 6-20020a17090602c600b00a1c91eb63cfmr1163130ejk.14.1702993916589; Tue, 19 Dec 2023 05:51:56 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1702993916; cv=none; d=google.com; s=arc-20160816; b=yYAF1IyJeWeewSCmjzNaW3FhXWk97Yywwixlzpl6Ib3xDaYf78TdCpTQakeVlAZMPy J6aV1WE6zSsXVEtRwHzoBz/eAS7a7g1GKdGO/Q18bmOdCfiApMSzAwq+q0sQJlTeGQLK oZQqQ4AXwSzAdQbtQqGUjp2PzHZ/2GVhcjxpEmyYw3/qrbPZlq0dcl46OdCBAdLzTGqk laz3LVEgx+Nee0ez9f0UcPeUYgDiqSs0e4avtzGRupn1qmB6Q36bd8WcXSJeX+iIGS2n pSMzbApPHKeLL18wDFNZnc7DmS73IhlbD+k7JLvbnGn4SrBEY8m50l/Wz91GAdt2DJGs 8XFg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=xq1f1jBr4XkUyEUcj8yDFOYNMksjfFLPe3NKskOFWQA=; fh=ee8NkWBU80C8M/eAg0DZ2jcsykhEHHQG1vcxPr+vQmg=; b=hSzsYV0KZ7mTuhPlMuYPLcVqmbPNZ1CfXIktuUeJPjh6T9V4hRKxVZsYTRbdPsHBhE MyNQKqaCTnXtzBtP8owp+GfXDH8tBmFV8sxD1idAfzH7HBk88IOc3ZTV7qO35kQssLDz uX1hnKUck50IYvJ7Xm7BFtSIVuPiqwNi9Vub3Cl4ME71eb7UBFX5+ICXIo8FdiDGo95i nkaMoLgmEIOu8IUKGJMPOAA8kjGVG5BF1lG/Shx9KSdo003AD2Q9HAss27A9zhNO06qF fEoF9rzFJzM6ejQqaBHyUUZi/XzsZrpsOC1xJ82+6+9I1GfhvOkFzhS0wjA3LuCD5Hgv JzVw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=RI7sX6aA; spf=pass (google.com: domain of linux-kernel+bounces-5284-ouuuleilei=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) smtp.mailfrom="linux-kernel+bounces-5284-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from am.mirrors.kernel.org (am.mirrors.kernel.org. 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Tue, 19 Dec 2023 05:50:51 -0800 (PST) Received: from localhost.localdomain ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id d17-20020a056a00245100b006cddecbf432sm20695264pfj.96.2023.12.19.05.50.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Dec 2023 05:50:51 -0800 (PST) From: Menglong Dong To: andrii@kernel.org, eddyz87@gmail.com, yonghong.song@linux.dev, alexei.starovoitov@gmail.com Cc: ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, martin.lau@linux.dev, song@kernel.org, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, mykolal@fb.com, shuah@kernel.org, menglong8.dong@gmail.com, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v5 3/4] selftests/bpf: activate the OP_NE logic in range_cond() Date: Tue, 19 Dec 2023 21:47:59 +0800 Message-Id: <20231219134800.1550388-4-menglong8.dong@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231219134800.1550388-1-menglong8.dong@gmail.com> References: <20231219134800.1550388-1-menglong8.dong@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785718548943494104 X-GMAIL-MSGID: 1785718548943494104 The edge range checking for the registers is supported by the verifier now, so we can activate the extended logic in tools/testing/selftests/bpf/prog_tests/reg_bounds.c/range_cond() to test such logic. Besides, I added some cases to the "crafted_cases" array for this logic. These cases are mainly used to test the edge of the src reg and dst reg. All reg bounds testings has passed in the SLOW_TESTS mode: $ export SLOW_TESTS=1 && ./test_progs -t reg_bounds -j Summary: 65/18959832 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Menglong Dong Acked-by: Andrii Nakryiko --- v5: - add "{U32, U32, {0, U32_MAX}, {U32_MAX, U32_MAX}}" v4: - remove reduplicated s32 casting v3: - do some adjustment to the crafted cases that we added v2: - add some cases to the "crafted_cases" --- .../selftests/bpf/prog_tests/reg_bounds.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/reg_bounds.c b/tools/testing/selftests/bpf/prog_tests/reg_bounds.c index 3bf4ddd720a8..820d0bcfc474 100644 --- a/tools/testing/selftests/bpf/prog_tests/reg_bounds.c +++ b/tools/testing/selftests/bpf/prog_tests/reg_bounds.c @@ -590,12 +590,7 @@ static void range_cond(enum num_t t, struct range x, struct range y, *newy = range(t, max_t(t, x.a, y.a), min_t(t, x.b, y.b)); break; case OP_NE: - /* generic case, can't derive more information */ - *newx = range(t, x.a, x.b); - *newy = range(t, y.a, y.b); - break; - - /* below extended logic is not supported by verifier just yet */ + /* below logic is supported by the verifier now */ if (x.a == x.b && x.a == y.a) { /* X is a constant matching left side of Y */ *newx = range(t, x.a, x.b); @@ -2101,6 +2096,18 @@ static struct subtest_case crafted_cases[] = { {S32, S64, {(u32)S32_MIN, (u32)(s32)-255}, {(u32)(s32)-2, 0}}, {S32, S64, {0, 1}, {(u32)S32_MIN, (u32)S32_MIN}}, {S32, U32, {(u32)S32_MIN, (u32)S32_MIN}, {(u32)S32_MIN, (u32)S32_MIN}}, + + /* edge overlap testings for BPF_NE */ + {U64, U64, {0, U64_MAX}, {U64_MAX, U64_MAX}}, + {U64, U64, {0, U64_MAX}, {0, 0}}, + {S64, U64, {S64_MIN, 0}, {S64_MIN, S64_MIN}}, + {S64, U64, {S64_MIN, 0}, {0, 0}}, + {S64, U64, {S64_MIN, S64_MAX}, {S64_MAX, S64_MAX}}, + {U32, U32, {0, U32_MAX}, {0, 0}}, + {U32, U32, {0, U32_MAX}, {U32_MAX, U32_MAX}}, + {S32, U32, {(u32)S32_MIN, 0}, {0, 0}}, + {S32, U32, {(u32)S32_MIN, 0}, {(u32)S32_MIN, (u32)S32_MIN}}, + {S32, U32, {(u32)S32_MIN, S32_MAX}, {S32_MAX, S32_MAX}}, }; /* Go over crafted hard-coded cases. This is fast, so we do it as part of