From: Amanieu d'Antras <amanieu@xxxxxxxxx> commit dd499f7a7e34270208350a849ef103c0b3ae477f upstream. copy_thread implementations handle CLONE_SETTLS by reading the TLS value from the registers containing the syscall arguments for clone. This doesn't work with clone3 since the TLS value is passed in clone_args instead. Signed-off-by: Amanieu d'Antras <amanieu@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # 5.3.x Link: https://lore.kernel.org/r/20200102172413.654385-8-amanieu@xxxxxxxxx Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/fork.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2513,6 +2513,16 @@ SYSCALL_DEFINE5(clone, unsigned long, cl #endif #ifdef __ARCH_WANT_SYS_CLONE3 + +/* + * copy_thread implementations handle CLONE_SETTLS by reading the TLS value from + * the registers containing the syscall arguments for clone. This doesn't work + * with clone3 since the TLS value is passed in clone_args instead. + */ +#ifndef CONFIG_HAVE_COPY_THREAD_TLS +#error clone3 requires copy_thread_tls support in arch +#endif + noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs, struct clone_args __user *uargs, size_t usize)
