From: Amanieu d'Antras Date: Thu, 2 Jan 2020 17:24:13 +0000 (+0100) Subject: clone3: ensure copy_thread_tls is implemented X-Git-Tag: v5.15~4770^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dd499f7a7e34270208350a849ef103c0b3ae477f;p=platform%2Fkernel%2Flinux-starfive.git clone3: ensure copy_thread_tls is implemented 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 Cc: # 5.3.x Link: https://lore.kernel.org/r/20200102172413.654385-8-amanieu@gmail.com Signed-off-by: Christian Brauner --- diff --git a/kernel/fork.c b/kernel/fork.c index 2508a4f..0808095 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2578,6 +2578,16 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, #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)