linux-kernel - [PATCH v9 29/39] selftests/clone3: Enable arm64 shadow stack testing

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Message-Id: <20240625-arm64-gcs-v9-29-0f634469b8f0@kernel.org>
Date: Tue, 25 Jun 2024 15:57:57 +0100
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>, 
 Andrew Morton <akpm@...ux-foundation.org>, Marc Zyngier <maz@...nel.org>, 
 Oliver Upton <oliver.upton@...ux.dev>, James Morse <james.morse@....com>, 
 Suzuki K Poulose <suzuki.poulose@....com>, Arnd Bergmann <arnd@...db.de>, 
 Oleg Nesterov <oleg@...hat.com>, Eric Biederman <ebiederm@...ssion.com>, 
 Shuah Khan <shuah@...nel.org>, 
 "Rick P. Edgecombe" <rick.p.edgecombe@...el.com>, 
 Deepak Gupta <debug@...osinc.com>, Ard Biesheuvel <ardb@...nel.org>, 
 Szabolcs Nagy <Szabolcs.Nagy@....com>, Kees Cook <kees@...nel.org>
Cc: "H.J. Lu" <hjl.tools@...il.com>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Florian Weimer <fweimer@...hat.com>, Christian Brauner <brauner@...nel.org>, 
 Thiago Jung Bauermann <thiago.bauermann@...aro.org>, 
 Ross Burton <ross.burton@....com>, linux-arm-kernel@...ts.infradead.org, 
 linux-doc@...r.kernel.org, kvmarm@...ts.linux.dev, 
 linux-fsdevel@...r.kernel.org, linux-arch@...r.kernel.org, 
 linux-mm@...ck.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 Mark Brown <broonie@...nel.org>
Subject: [PATCH v9 29/39] selftests/clone3: Enable arm64 shadow stack
 testing

In order to test shadow stack support in clone3() the clone3() selftests
need to have a fully inline clone3() call, provide one for arm64.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/clone3/clone3_selftests.h | 26 +++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/testing/selftests/clone3/clone3_selftests.h b/tools/testing/selftests/clone3/clone3_selftests.h
index 38d82934668a..e32915085333 100644
--- a/tools/testing/selftests/clone3/clone3_selftests.h
+++ b/tools/testing/selftests/clone3/clone3_selftests.h
@@ -69,6 +69,32 @@ static pid_t __always_inline sys_clone3(struct __clone_args *args, size_t size)

 	return ret;
 }
+#elif defined(__aarch64__)
+static pid_t __always_inline sys_clone3(struct __clone_args *args, size_t size)
+{
+	register long _num  __asm__ ("x8") = __NR_clone3;
+	register long _args __asm__ ("x0") = (long)(args);
+	register long _size __asm__ ("x1") = (long)(size);
+	register long arg2 __asm__ ("x2") = 0;
+	register long arg3 __asm__ ("x3") = 0;
+	register long arg4 __asm__ ("x4") = 0;
+
+	__asm__ volatile (
+		"svc #0\n"
+		: "=r"(_args)
+		: "r"(_args), "r"(_size),
+		  "r"(_num), "r"(arg2),
+		  "r"(arg3), "r"(arg4)
+		: "memory", "cc"
+	);
+
+	if ((int)_args < 0) {
+		errno = -((int)_args);
+		return -1;
+	}
+
+	return _args;
+}
 #else
 static pid_t sys_clone3(struct __clone_args *args, size_t size)
 {

-- 
2.39.2