From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B7F7CC3ABC3 for ; Tue, 6 May 2025 18:18:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:CC:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Aiu7kQmR+J6J1ALPAEUqo++B6yDpZYXZ8+/9UD1mQyk=; b=mTXJf73Y/SzmvL U7myJBCKc1/aCsL2XFKvaEuN3fSX8jq9Ev/SHg5ekMyxCenenO2tHsik7Gji2yCELFJpXTCWb0aLm D/cPsLE0lwIAPHxx1t/KNIycb0k3eQ7hh5n8LbrT/yxHZ9MnzXQiUlVc/DmHTeJHe0vZmjh/qHwNW RysF9g22rUpLNkBr1xR780sdJYwWKCXSgLJwzfXvv3ngAxn6h9LCSVBuRdg7GYv82lqzAWPx2ZCg8 9ZwyR+Mm+chwLKW77iuaiqZVeKjZs7F9emEr/0IjibGDNiXCHi7CloMVKs4qE7Xbz8cmfiy//9LPg cvfeOMIbR2aKt6TBa3mg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uCMsW-0000000CxU5-2L2O; Tue, 06 May 2025 18:18:52 +0000 Received: from szxga07-in.huawei.com ([45.249.212.35]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uCJCV-0000000CImW-1N1B for linux-riscv@lists.infradead.org; Tue, 06 May 2025 14:23:17 +0000 Received: from mail.maildlp.com (unknown [172.19.163.17]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4ZsLFn5g1vzsTJl; Tue, 6 May 2025 22:22:37 +0800 (CST) Received: from kwepemf100007.china.huawei.com (unknown [7.202.181.221]) by mail.maildlp.com (Postfix) with ESMTPS id D6A521A0188; Tue, 6 May 2025 22:23:11 +0800 (CST) Received: from [10.67.109.184] (10.67.109.184) by kwepemf100007.china.huawei.com (7.202.181.221) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 6 May 2025 22:23:09 +0800 Message-ID: <22ecc626-0982-4cff-adfd-9ea4bb658ee5@huawei.com> Date: Tue, 6 May 2025 22:23:09 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH bpf-next 6/8] selftests/bpf: Avoid passing out-of-range values to __retval() Content-Language: en-US To: Peilin Ye , CC: , Andrea Parri , =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= , Puranjay Mohan , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , "Paul E. McKenney" , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Luke Nelson , Xi Wang , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Mykola Lysenko , Shuah Khan , Josh Don , Barret Rhoden , Neel Natu , Benjamin Segall References: <5f7e4c5ac5d254c0f42b4ba274437262e238a5cb.1745970908.git.yepeilin@google.com> From: Pu Lehui In-Reply-To: <5f7e4c5ac5d254c0f42b4ba274437262e238a5cb.1745970908.git.yepeilin@google.com> X-Originating-IP: [10.67.109.184] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To kwepemf100007.china.huawei.com (7.202.181.221) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250506_072315_805530_15E7B683 X-CRM114-Status: GOOD ( 11.90 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 2025/4/30 8:51, Peilin Ye wrote: > Currently, we pass 0x1234567890abcdef to __retval() for the following > two tests: > > verifier_load_acquire/load_acquire_64 > verifier_store_release/store_release_64 > > However, the upper 32 bits of that value are being ignored, since > __retval() expects an int. Actually, the tests would still pass even if > I change '__retval(0x1234567890abcdef)' to e.g. '__retval(0x90abcdef)'. > > Restructure the tests a bit to test the entire 64-bit values properly. > Do the same to their 8-, 16- and 32-bit variants as well to keep the > style consistent. > > Fixes: ff3afe5da998 ("selftests/bpf: Add selftests for load-acquire and store-release instructions") > Signed-off-by: Peilin Ye > --- > .../bpf/progs/verifier_load_acquire.c | 40 +++++++++++++------ > .../bpf/progs/verifier_store_release.c | 32 +++++++++++---- > 2 files changed, 52 insertions(+), 20 deletions(-) > > diff --git a/tools/testing/selftests/bpf/progs/verifier_load_acquire.c b/tools/testing/selftests/bpf/progs/verifier_load_acquire.c > index 77698d5a19e4..a696ab84bfd6 100644 > --- a/tools/testing/selftests/bpf/progs/verifier_load_acquire.c > +++ b/tools/testing/selftests/bpf/progs/verifier_load_acquire.c > @@ -10,65 +10,81 @@ > > SEC("socket") > __description("load-acquire, 8-bit") > -__success __success_unpriv __retval(0x12) > +__success __success_unpriv __retval(0) > __naked void load_acquire_8(void) > { > asm volatile ( > + "r0 = 0;" > "w1 = 0x12;" > "*(u8 *)(r10 - 1) = w1;" > - ".8byte %[load_acquire_insn];" // w0 = load_acquire((u8 *)(r10 - 1)); > + ".8byte %[load_acquire_insn];" // w2 = load_acquire((u8 *)(r10 - 1)); > + "if r2 == r1 goto 1f;" > + "r0 = 1;" > +"1:" > "exit;" > : > : __imm_insn(load_acquire_insn, > - BPF_ATOMIC_OP(BPF_B, BPF_LOAD_ACQ, BPF_REG_0, BPF_REG_10, -1)) > + BPF_ATOMIC_OP(BPF_B, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -1)) > : __clobber_all); > } > > SEC("socket") > __description("load-acquire, 16-bit") > -__success __success_unpriv __retval(0x1234) > +__success __success_unpriv __retval(0) > __naked void load_acquire_16(void) > { > asm volatile ( > + "r0 = 0;" > "w1 = 0x1234;" > "*(u16 *)(r10 - 2) = w1;" > - ".8byte %[load_acquire_insn];" // w0 = load_acquire((u16 *)(r10 - 2)); > + ".8byte %[load_acquire_insn];" // w2 = load_acquire((u16 *)(r10 - 2)); > + "if r2 == r1 goto 1f;" > + "r0 = 1;" > +"1:" > "exit;" > : > : __imm_insn(load_acquire_insn, > - BPF_ATOMIC_OP(BPF_H, BPF_LOAD_ACQ, BPF_REG_0, BPF_REG_10, -2)) > + BPF_ATOMIC_OP(BPF_H, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -2)) > : __clobber_all); > } > > SEC("socket") > __description("load-acquire, 32-bit") > -__success __success_unpriv __retval(0x12345678) > +__success __success_unpriv __retval(0) > __naked void load_acquire_32(void) > { > asm volatile ( > + "r0 = 0;" > "w1 = 0x12345678;" > "*(u32 *)(r10 - 4) = w1;" > - ".8byte %[load_acquire_insn];" // w0 = load_acquire((u32 *)(r10 - 4)); > + ".8byte %[load_acquire_insn];" // w2 = load_acquire((u32 *)(r10 - 4)); > + "if r2 == r1 goto 1f;" > + "r0 = 1;" > +"1:" > "exit;" > : > : __imm_insn(load_acquire_insn, > - BPF_ATOMIC_OP(BPF_W, BPF_LOAD_ACQ, BPF_REG_0, BPF_REG_10, -4)) > + BPF_ATOMIC_OP(BPF_W, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -4)) > : __clobber_all); > } > > SEC("socket") > __description("load-acquire, 64-bit") > -__success __success_unpriv __retval(0x1234567890abcdef) > +__success __success_unpriv __retval(0) > __naked void load_acquire_64(void) > { > asm volatile ( > + "r0 = 0;" > "r1 = 0x1234567890abcdef ll;" > "*(u64 *)(r10 - 8) = r1;" > - ".8byte %[load_acquire_insn];" // r0 = load_acquire((u64 *)(r10 - 8)); > + ".8byte %[load_acquire_insn];" // r2 = load_acquire((u64 *)(r10 - 8)); > + "if r2 == r1 goto 1f;" > + "r0 = 1;" > +"1:" > "exit;" > : > : __imm_insn(load_acquire_insn, > - BPF_ATOMIC_OP(BPF_DW, BPF_LOAD_ACQ, BPF_REG_0, BPF_REG_10, -8)) > + BPF_ATOMIC_OP(BPF_DW, BPF_LOAD_ACQ, BPF_REG_2, BPF_REG_10, -8)) > : __clobber_all); > } > > diff --git a/tools/testing/selftests/bpf/progs/verifier_store_release.c b/tools/testing/selftests/bpf/progs/verifier_store_release.c > index 7e456e2861b4..72f1eb006074 100644 > --- a/tools/testing/selftests/bpf/progs/verifier_store_release.c > +++ b/tools/testing/selftests/bpf/progs/verifier_store_release.c > @@ -10,13 +10,17 @@ > > SEC("socket") > __description("store-release, 8-bit") > -__success __success_unpriv __retval(0x12) > +__success __success_unpriv __retval(0) > __naked void store_release_8(void) > { > asm volatile ( > + "r0 = 0;" > "w1 = 0x12;" > ".8byte %[store_release_insn];" // store_release((u8 *)(r10 - 1), w1); > - "w0 = *(u8 *)(r10 - 1);" > + "w2 = *(u8 *)(r10 - 1);" > + "if r2 == r1 goto 1f;" > + "r0 = 1;" > +"1:" > "exit;" > : > : __imm_insn(store_release_insn, > @@ -26,13 +30,17 @@ __naked void store_release_8(void) > > SEC("socket") > __description("store-release, 16-bit") > -__success __success_unpriv __retval(0x1234) > +__success __success_unpriv __retval(0) > __naked void store_release_16(void) > { > asm volatile ( > + "r0 = 0;" > "w1 = 0x1234;" > ".8byte %[store_release_insn];" // store_release((u16 *)(r10 - 2), w1); > - "w0 = *(u16 *)(r10 - 2);" > + "w2 = *(u16 *)(r10 - 2);" > + "if r2 == r1 goto 1f;" > + "r0 = 1;" > +"1:" > "exit;" > : > : __imm_insn(store_release_insn, > @@ -42,13 +50,17 @@ __naked void store_release_16(void) > > SEC("socket") > __description("store-release, 32-bit") > -__success __success_unpriv __retval(0x12345678) > +__success __success_unpriv __retval(0) > __naked void store_release_32(void) > { > asm volatile ( > + "r0 = 0;" > "w1 = 0x12345678;" > ".8byte %[store_release_insn];" // store_release((u32 *)(r10 - 4), w1); > - "w0 = *(u32 *)(r10 - 4);" > + "w2 = *(u32 *)(r10 - 4);" > + "if r2 == r1 goto 1f;" > + "r0 = 1;" > +"1:" > "exit;" > : > : __imm_insn(store_release_insn, > @@ -58,13 +70,17 @@ __naked void store_release_32(void) > > SEC("socket") > __description("store-release, 64-bit") > -__success __success_unpriv __retval(0x1234567890abcdef) > +__success __success_unpriv __retval(0) > __naked void store_release_64(void) > { > asm volatile ( > + "r0 = 0;" > "r1 = 0x1234567890abcdef ll;" > ".8byte %[store_release_insn];" // store_release((u64 *)(r10 - 8), r1); > - "r0 = *(u64 *)(r10 - 8);" > + "r2 = *(u64 *)(r10 - 8);" > + "if r2 == r1 goto 1f;" > + "r0 = 1;" > +"1:" > "exit;" > : > : __imm_insn(store_release_insn, Reviewed-by: Pu Lehui _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv