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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8664E7718F for ; Thu, 26 Dec 2024 10:53:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 662926B0089; Thu, 26 Dec 2024 05:53:24 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 5E1076B008C; Thu, 26 Dec 2024 05:53:24 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 40E476B008A; Thu, 26 Dec 2024 05:53:24 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 1C9A96B0088 for ; Thu, 26 Dec 2024 05:53:24 -0500 (EST) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id C33FD44EAA for ; Thu, 26 Dec 2024 10:53:23 +0000 (UTC) X-FDA: 82936796250.09.B379679 Received: from flow-a7-smtp.messagingengine.com (flow-a7-smtp.messagingengine.com [103.168.172.142]) by imf08.hostedemail.com (Postfix) with ESMTP id E967D160008 for ; Thu, 26 Dec 2024 10:52:53 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=coelacanthus.name header.s=fm3 header.b=FkDXc9dT; dkim=pass header.d=messagingengine.com header.s=fm2 header.b="b 7HF2BS"; spf=pass (imf08.hostedemail.com: domain of uwu@coelacanthus.name designates 103.168.172.142 as permitted sender) smtp.mailfrom=uwu@coelacanthus.name; dmarc=pass (policy=quarantine) header.from=coelacanthus.name ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1735210374; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=sEK+xPK5km/mZ+DWNzMlZAIQ7OUPbQ+75uTCBsT7PHI=; b=SLTXdChR6SaelZRJHm9HTRjKLJ9TmKZRLm/mPsP258VBZiE38vvAreGsplmQ5zoDtA6bgp PAsgtvpcMxf6AH70MaPW0Dx1pXvXfgRLaWxUJvZ8HVJGtrdyl3UR1w/BMH9bGHI7SshaI+ 5L8GHjCje5UZ1AJeyVDIQ3GRCesWhik= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1735210374; a=rsa-sha256; cv=none; b=GCyYPoQi7ip2pQE91Q4yeC3nleQAXBtBzNNkwfB8GkgN3LvyCML/Ngfq2AAhJaycXQyYwq grNfM+rz2HxCN3BTcvhm8ayvpnkonBjApx3TrEWg0ZwV+B6jzDxTRr1ncmV9d/ZO6a5352 ZsbDR/nhRInTGVrc19fwtKt4i6U7vJg= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=coelacanthus.name header.s=fm3 header.b=FkDXc9dT; dkim=pass header.d=messagingengine.com header.s=fm2 header.b="b 7HF2BS"; spf=pass (imf08.hostedemail.com: domain of uwu@coelacanthus.name designates 103.168.172.142 as permitted sender) smtp.mailfrom=uwu@coelacanthus.name; dmarc=pass (policy=quarantine) header.from=coelacanthus.name Received: from phl-compute-06.internal (phl-compute-06.phl.internal [10.202.2.46]) by mailflow.phl.internal (Postfix) with ESMTP id 2B3CB2002B1; Thu, 26 Dec 2024 05:53:21 -0500 (EST) Received: from phl-mailfrontend-02 ([10.202.2.163]) by phl-compute-06.internal (MEProxy); Thu, 26 Dec 2024 05:53:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= coelacanthus.name; h=cc:cc:content-transfer-encoding :content-type: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=1735210401; x=1735217601; bh=sEK+xPK5km /mZ+DWNzMlZAIQ7OUPbQ+75uTCBsT7PHI=; b=FkDXc9dTKMbNiPGPtcE/ilPFDR 5Mt+58TSxkTJBm6FmtVBLqb5/8ieshlPMz+IJN9tKIKpZM1aDYhxUHELjpitZPQl MX7mMKURwrfetvjQxOqZxSIlnjvsk0LtHgRJtuWLlcWVRbZ2bRm7u0bnJcoY5v/2 vHme18QrViCPIKfv4XXibwnkbG953ls+/+sQD9vtridoeFTPKeODe6HYyP3Jrla8 ToZA5R6vFeqwxCPcohjASoWmzOpod/yaupVpbjkMdEI7Pv6fvVvwnDeNgynr8zZQ nciV1e3mJDIb2sof2pnbI5wrpSjSP+H4g7cLKroXWWwrFhQ/PDZPwWm/6a+Q== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type: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-sender:x-me-sender:x-sasl-enc; s=fm2; t=1735210401; x= 1735217601; bh=sEK+xPK5km/mZ+DWNzMlZAIQ7OUPbQ+75uTCBsT7PHI=; b=b 7HF2BSueApbcES4dQH5QiNF7a5x+pf+3xNKRqOZNXmsYkp/be4+787Avhp2zwCf1 NKNS545zJjN43eqkLRZVdyNQbtCyM4MFNU6nFsvseruhzvwdPPPkZ71Xu3EsWR6x VQRPt/T97YSSTdj3bvBJulKqRNPX9GyexIjxVgwqQW6uYoYRBzRsopd59UFlOZE3 qId2wr/Z7tVF4QE6dtBEjJu65Gn8fHwecyDR8//eAAL1Bw43mf1gq01GpfJz7HUX sWnWwevkeB/DIbDT8Dn58Us4Q20OlcK7dhGM0KlQ3FziVZ1HipCcPzK9qPu4h/Ns gJIaq/8j2xrxvA1Dsh7xg== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefuddruddukedgvdduucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdggtfgfnhhsuhgsshgtrhhisggvpdfu rfetoffkrfgpnffqhgenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnh htshculddquddttddmnecujfgurhephfffufggtgfgkfhfjgfvvefosehtkeertdertdej necuhfhrohhmpeevvghlvghsthgvucfnihhuuceouhifuhestghovghlrggtrghnthhhuh hsrdhnrghmvgeqnecuggftrfgrthhtvghrnhepiedugeffhfdtueduudefhfefhfehjeej hfeukeehffefuefgueevteeiuedvtdefnecuvehluhhsthgvrhfuihiivgeptdenucfrrg hrrghmpehmrghilhhfrhhomhepuhifuhestghovghlrggtrghnthhhuhhsrdhnrghmvgdp nhgspghrtghpthhtohepvdeipdhmohguvgepshhmthhpohhuthdprhgtphhtthhopehshh hurghhsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehfvghlihigohhnmhgrrhhssegr rhgthhhlihhnuhigrdhorhhgpdhrtghpthhtohepphgruhhlrdifrghlmhhslhgvhiessh hifhhivhgvrdgtohhmpdhrtghpthhtoheprghouhesvggvtghsrdgsvghrkhgvlhgvhidr vgguuhdprhgtphhtthhopehufihusegtohgvlhgrtggrnhhthhhushdrnhgrmhgvpdhrtg hpthhtohepghhuohhrvghnsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehrvgesfiei rhiirdhnvghtpdhrtghpthhtohepsghjohhrnheskhgvrhhnvghlrdhorhhgpdhrtghpth htohepthhglhigsehlihhnuhhtrhhonhhigidruggv X-ME-Proxy: Feedback-ID: i95c648bc:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Thu, 26 Dec 2024 05:53:20 -0500 (EST) From: Celeste Liu Date: Thu, 26 Dec 2024 18:52:52 +0800 Subject: [PATCH v4 2/2] riscv: selftests: Add a ptrace test to verify syscall parameter modification MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20241226-riscv-new-regset-v4-2-4496a29d0436@coelacanthus.name> References: <20241226-riscv-new-regset-v4-0-4496a29d0436@coelacanthus.name> In-Reply-To: <20241226-riscv-new-regset-v4-0-4496a29d0436@coelacanthus.name> To: Oleg Nesterov , Paul Walmsley , Palmer Dabbelt , Eric Biederman , Kees Cook , Shuah Khan , Albert Ou Cc: Alexandre Ghiti , "Dmitry V. Levin" , Andrea Bolognani , =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= , Thomas Gleixner , Ron Economos , Charlie Jenkins , Andrew Jones , Quan Zhou , Felix Yan , Ruizhe Pan , Guo Ren , Yao Zi , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Celeste Liu , =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=6177; i=uwu@coelacanthus.name; h=from:subject:message-id; bh=LhYGmYOKKNxhqjWV6WITtgLh7rsJPNHBqIMMBzkdr3Q=; b=owJ4nJvAy8zAJeafov85RWVtBeNptSSG9FzTKVtfrfZccPvD9Kwok7otyxunG/mVFDnkZHbnS 984LRWvntlRysIgxsUgK6bIklfC8pPz0tnuvR3bu2DmsDKBDGHg4hSAiTieYfifE2ny7NnfT6ym Nf+fBuxmWMTY5yIq22InPtt8puDux7KLGRlmpDUH7qllvRitofLxnODVGZ9tHr7JM3R/up3rUfG F7GR2ALfhSNE= X-Developer-Key: i=uwu@coelacanthus.name; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: E967D160008 X-Stat-Signature: jjsbimi334gxypmjo49r65n8f77k14as X-Rspam-User: X-HE-Tag: 1735210373-190260 X-HE-Meta: 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 998CfHNl 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This test checks that orig_a0 allows a syscall argument to be modified, and that changing a0 does not change the syscall argument. Co-developed-by: Quan Zhou Signed-off-by: Quan Zhou Co-developed-by: Charlie Jenkins Signed-off-by: Charlie Jenkins Reviewed-by: Björn Töpel Signed-off-by: Celeste Liu --- tools/testing/selftests/riscv/abi/.gitignore | 1 + tools/testing/selftests/riscv/abi/Makefile | 5 +- tools/testing/selftests/riscv/abi/ptrace.c | 151 +++++++++++++++++++++++++++ 3 files changed, 156 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/riscv/abi/.gitignore b/tools/testing/selftests/riscv/abi/.gitignore index b38358f91c4d2240ae64892871d9ca98bda1ae58..378c605919a3b3d58eec2701eb7af430cfe315d6 100644 --- a/tools/testing/selftests/riscv/abi/.gitignore +++ b/tools/testing/selftests/riscv/abi/.gitignore @@ -1 +1,2 @@ pointer_masking +ptrace diff --git a/tools/testing/selftests/riscv/abi/Makefile b/tools/testing/selftests/riscv/abi/Makefile index ed82ff9c664e7eb3f760cbab81fb957ff72579c5..3f74d059dfdcbce4d45d8ff618781ccea1419061 100644 --- a/tools/testing/selftests/riscv/abi/Makefile +++ b/tools/testing/selftests/riscv/abi/Makefile @@ -2,9 +2,12 @@ CFLAGS += -I$(top_srcdir)/tools/include -TEST_GEN_PROGS := pointer_masking +TEST_GEN_PROGS := pointer_masking ptrace include ../../lib.mk $(OUTPUT)/pointer_masking: pointer_masking.c $(CC) -static -o$@ $(CFLAGS) $(LDFLAGS) $^ + +$(OUTPUT)/ptrace: ptrace.c + $(CC) -static -o$@ $(CFLAGS) $(LDFLAGS) $^ diff --git a/tools/testing/selftests/riscv/abi/ptrace.c b/tools/testing/selftests/riscv/abi/ptrace.c new file mode 100644 index 0000000000000000000000000000000000000000..023695352215bb5de3f91c1a6f5ea3b4f9373ff9 --- /dev/null +++ b/tools/testing/selftests/riscv/abi/ptrace.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../../kselftest_harness.h" + +#define ORIG_A0_MODIFY 0x01 +#define A0_MODIFY 0x02 +#define A0_OLD 0x03 +#define A0_NEW 0x04 + +struct a0_regs { + __s64 orig_a0; + __u64 a0; +}; + +#define perr_and_exit(fmt, ...) \ + ({ \ + char buf[256]; \ + snprintf(buf, sizeof(buf), "%s:%d:" fmt ": %m\n", \ + __func__, __LINE__, ##__VA_ARGS__); \ + ksft_exit_fail_perror(buf); \ + }) + +static inline void resume_and_wait_tracee(pid_t pid, int flag) +{ + int status; + + if (ptrace(flag, pid, 0, 0)) + perr_and_exit("failed to resume the tracee %d\n", pid); + + if (waitpid(pid, &status, 0) != pid) + perr_and_exit("failed to wait for the tracee %d\n", pid); +} + +static void ptrace_test(int opt, struct a0_regs *result) +{ + int status; + pid_t pid; + struct user_regs_struct regs; + struct iovec iov = { + .iov_base = ®s, + .iov_len = sizeof(regs), + }; + + unsigned long orig_a0; + struct iovec a0_iov = { + .iov_base = &orig_a0, + .iov_len = sizeof(orig_a0), + }; + struct ptrace_syscall_info syscall_info_entry, syscall_info_exit; + + pid = fork(); + if (pid == 0) { + /* Mark oneself being traced */ + long val = ptrace(PTRACE_TRACEME, 0, 0, 0); + + if (val) + perr_and_exit("failed to request for tracer to trace me: %ld\n", val); + + kill(getpid(), SIGSTOP); + + /* Perform exit syscall that will be intercepted */ + exit(A0_OLD); + } + + if (pid < 0) + ksft_exit_fail_perror("failed to fork"); + + if (waitpid(pid, &status, 0) != pid) + perr_and_exit("failed to wait for the tracee %d\n", pid); + + /* Stop at the entry point of the syscall */ + resume_and_wait_tracee(pid, PTRACE_SYSCALL); + + /* Check tracee regs before the syscall */ + if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov)) + perr_and_exit("failed to get tracee registers\n"); + if (ptrace(PTRACE_GETREGSET, pid, NT_RISCV_ORIG_A0, &a0_iov)) + perr_and_exit("failed to get tracee registers\n"); + if (orig_a0 != A0_OLD) + perr_and_exit("unexpected orig_a0: 0x%lx\n", orig_a0); + + /* Modify a0/orig_a0 for the syscall */ + switch (opt) { + case A0_MODIFY: + regs.a0 = A0_NEW; + break; + case ORIG_A0_MODIFY: + orig_a0 = A0_NEW; + break; + } + + if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov)) + perr_and_exit("failed to set tracee registers\n"); + if (ptrace(PTRACE_SETREGSET, pid, NT_RISCV_ORIG_A0, &a0_iov)) + perr_and_exit("failed to set tracee registers\n"); + + if (ptrace(PTRACE_GET_SYSCALL_INFO, pid, PTRACE_SYSCALL_INFO_ENTRY, &syscall_info_entry)) + perr_and_exit("failed to get syscall info of entry\n"); + result->orig_a0 = syscall_info_entry->entry.args[0]; + if (ptrace(PTRACE_GET_SYSCALL_INFO, pid, PTRACE_SYSCALL_INFO_EXIT, &syscall_info_exit)) + perr_and_exit("failed to get syscall info of exit\n"); + result->a0 = syscall_info_exit->exit.rval; + + /* Resume the tracee */ + ptrace(PTRACE_CONT, pid, 0, 0); + if (waitpid(pid, &status, 0) != pid) + perr_and_exit("failed to wait for the tracee\n"); + +} + +TEST(ptrace_modify_a0) +{ + struct a0_regs result; + + ptrace_test(A0_MODIFY, &result); + + /* The modification of a0 cannot affect the first argument of the syscall */ + EXPECT_EQ(A0_OLD, result.orig_a0); + EXPECT_EQ(A0_NEW, result.a0); +} + +TEST(ptrace_modify_orig_a0) +{ + struct a0_regs result; + + ptrace_test(ORIG_A0_MODIFY, &result); + + /* Only modify orig_a0 to change the first argument of the syscall */ + EXPECT_EQ(A0_NEW, result.orig_a0); + /* a0 will keep default value, orig_a0 or -ENOSYS, depends on internal. */ + EXPECT_NE(A0_NEW, result.a0); +} + +TEST_HARNESS_MAIN -- 2.47.1