| Message ID | 20240801-arm64-gcs-v10-29-699e2bd2190b@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64/gcs: Provide support for GCS in userspace | expand |
Mark Brown <broonie@kernel.org> writes: > 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(+) Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org> The clone3 test passes on my FVP setup: Tested-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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) {
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(+)