linux-kernel - [PATCH 3/3] kselftest/arm64: Handle attempts to disable SM on SME only systems

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250718-arm64-fp-ptrace-sme-only-v1-3-3b96dd19a503@kernel.org>
Date: Fri, 18 Jul 2025 23:14:52 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>, 
 linux-arm-kernel@...ts.infradead.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH 3/3] kselftest/arm64: Handle attempts to disable SM on SME
 only systems

The ABI for disabling streaming mode via ptrace is to do a write via the
SVE register set. Following the recent round of fixes to the ptrace code
we don't support this operation on systems without SVE, which is detected
as failures by fp-ptrace. Update the program so that it knows that this
operation is not currently supported.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/arm64/fp/fp-ptrace.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/arm64/fp/fp-ptrace.c b/tools/testing/selftests/arm64/fp/fp-ptrace.c
index 9fc9dc4adaf9..21bc4eac092e 100644
--- a/tools/testing/selftests/arm64/fp/fp-ptrace.c
+++ b/tools/testing/selftests/arm64/fp/fp-ptrace.c
@@ -1061,6 +1061,9 @@ static bool sve_write_supported(struct test_config *config)
 		if (config->sme_vl_in != config->sme_vl_expected) {
 			return false;
 		}
+
+		if (!sve_supported())
+			return false;
 	}
 
 	return true;

-- 
2.39.5