[PATCH v10 29/40] selftests/clone3: Enable arm64 shadow stack testing
From: Mark Brown <broonie@kernel.org>
Date: 2024-08-01 13:00:43
Also in:
kvmarm, linux-arch, linux-doc, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml
Subsystem:
kernel selftest framework, pidfd api, the rest · Maintainers:
Shuah Khan, Christian Brauner, Linus Torvalds
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) {
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2.39.2