[PATCH v10 29/40] selftests/clone3: Enable arm64 shadow stack testing

Mark Brown
2024-08-01T13:00:43Z

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@kernel.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