From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 12D6427B332; Wed, 20 Aug 2025 18:29:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755714574; cv=none; b=jrz/7sbnYUe6fhjL0Th7xTg3AFfdil9cT3hE2O9Iwru51pppFj+L9wr3aS7xaePslQUDaAt2wgLFknnZuqgA0NhsjNBu+iHxSs5YCEZbPf7TL2x1jzrfPs6sz0PIwuBpmNF+4NP2E7FKblxYcM1kSMNXEG+/3OGuSEnYRdP1QW8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755714574; c=relaxed/simple; bh=OMuQjCF+LEZgzxsBMcsJNa9yV1ZyVyIxF/02RSfwA9w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rIz1uknG7VTdLG6UHniV3JcSCyYHrmoPhtKFg8wDpM7uFhtj4Xpk//gd524PBF31coIPuMYa/ijYJJhvQKyo1OHEg8NXZZwqp6KUdHCX1qvAookv16asyZWFPJo1eraHk5XkllHmY3bdu5xn81DdwDXf7J/9uAg5yySB8FCkiiE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OhBmXqQL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OhBmXqQL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35B4AC113CF; Wed, 20 Aug 2025 18:29:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755714573; bh=OMuQjCF+LEZgzxsBMcsJNa9yV1ZyVyIxF/02RSfwA9w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=OhBmXqQL69XWfsGVFWp2pL/cMtfurNw6+7j363cugbyi8aJf+ZqZm+iHOy1eKLZn2 8QRQu7MxHqvJDgmu7QoxZ0WsPicOVAch51AjpUW/ZecIYUfeS+LcciVcglsrT04m64 gClvL9u+u1cr/1wtBQboezre3jeoVqzMJPrOz9d/9ZRQgbdUo63s+4YiawIzgaMME4 0zUEV1WfvWVYeQuXuvbNLTRBc53PxTE93gL8QTYDV46U14N2JeCnGA+9LMqRTx9u9L bDmMU8EqTuZ19PGO4lMvPCTgi/O4H3rymQppPdZfvW/BatIyg14RonP8G7NJf6QCT4 ls007xoMEHJOw== From: Mark Brown Date: Wed, 20 Aug 2025 19:29:04 +0100 Subject: [PATCH 2/5] kselftest/arm64: Check that unsupported regsets fail in sve-ptrace Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250820-arm64-sme-ptrace-sme-only-v1-2-f7c22b2871f8@kernel.org> References: <20250820-arm64-sme-ptrace-sme-only-v1-0-f7c22b2871f8@kernel.org> In-Reply-To: <20250820-arm64-sme-ptrace-sme-only-v1-0-f7c22b2871f8@kernel.org> To: Catalin Marinas , Will Deacon , Shuah Khan , Jonathan Corbet , Oleg Nesterov Cc: Mark Rutland , David Spickett , Thiago Jung Bauermann , Luis Machado , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-cff91 X-Developer-Signature: v=1; a=openpgp-sha256; l=2392; i=broonie@kernel.org; h=from:subject:message-id; bh=OMuQjCF+LEZgzxsBMcsJNa9yV1ZyVyIxF/02RSfwA9w=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBophQBEDrSy5gbCqYmjEOVsYPzA4r4WdGUBR02Q RVoZ08qRU+JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCaKYUAQAKCRAk1otyXVSH 0LFHB/oC7r5NmS8rvezdaqGX2+jaZs1ybK8ILWXxbmD+IDd6cmq1X8uUwnciGXVu22tSN9cG/Wq 3KWsSiqlDjt1kXrsRDAzETo67WqYE7X7J0+Dk+trnLio0RCAhEaKImXWuOJ4x8aZLHSer9ighDu ehY4ZcFL1aRkV/BGAgDvHGxf4HBSJp4jzcyGx4PH1Z4ImeCyNvTgAVSr8ou9CbuRzLvWj8os9B6 iQrDaF3OxR+AaeZ4MbstnNh0o8ZMCODMfiek2GRRBhgYfNyP/TmPzOdygh1JvY976Bp2sM74AT0 9onIDfm5+mSUwp7qBm7f4QbxWhEtVqO8dtOseV4qykTrTeua X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Add a test which verifies that NT_ARM_SVE and NT_ARM_SSVE reads and writes are rejected as expected when the relevant architecture feature is not supported. Signed-off-by: Mark Brown --- tools/testing/selftests/arm64/fp/sve-ptrace.c | 46 +++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/tools/testing/selftests/arm64/fp/sve-ptrace.c b/tools/testing/selftests/arm64/fp/sve-ptrace.c index a9b2377c46b8..5f39ca0b4194 100644 --- a/tools/testing/selftests/arm64/fp/sve-ptrace.c +++ b/tools/testing/selftests/arm64/fp/sve-ptrace.c @@ -158,6 +158,38 @@ static int set_sve(pid_t pid, const struct vec_type *type, return ptrace(PTRACE_SETREGSET, pid, type->regset, &iov); } +/* A read operation fails */ +static void read_fails(pid_t child, const struct vec_type *type) +{ + struct user_sve_header *new_sve = NULL; + size_t new_sve_size = 0; + void *ret; + + ret = get_sve(child, type, (void **)&new_sve, &new_sve_size); + + ksft_test_result(ret == NULL, "%s unsupported read fails\n", + type->name); + + free(new_sve); +} + +/* A write operation fails */ +static void write_fails(pid_t child, const struct vec_type *type) +{ + struct user_sve_header sve; + int ret; + + /* Just the header, no data */ + memset(&sve, 0, sizeof(sve)); + sve.size = sizeof(sve); + sve.flags = SVE_PT_REGS_SVE; + sve.vl = SVE_VL_MIN; + ret = set_sve(child, type, &sve); + + ksft_test_result(ret != 0, "%s unsupported write fails\n", + type->name); +} + /* Validate setting and getting the inherit flag */ static void ptrace_set_get_inherit(pid_t child, const struct vec_type *type) { @@ -702,6 +734,20 @@ static int do_parent(pid_t child) } for (i = 0; i < ARRAY_SIZE(vec_types); i++) { + /* + * If the vector type isn't supported reads and writes + * should fail. + */ + if (!(getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap)) { + read_fails(child, &vec_types[i]); + write_fails(child, &vec_types[i]); + } else { + ksft_test_result_skip("%s unsupported read fails\n", + vec_types[i].name); + ksft_test_result_skip("%s unsupported write fails\n", + vec_types[i].name); + } + /* FPSIMD via SVE regset */ if (getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap) { ptrace_sve_fpsimd(child, &vec_types[i]); -- 2.39.5