From 4f43cdc72331bdbf3562d266969779aed7a834af Mon Sep 17 00:00:00 2001 From: Amanieu d'Antras Date: Thu, 2 Jan 2020 18:24:13 +0100 Subject: [PATCH] clone3: ensure copy_thread_tls is implemented 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 Cc: # 5.3.x Link: https://lore.kernel.org/r/20200102172413.654385-8-amanieu@gmail.com Signed-off-by: Christian Brauner Signed-off-by: Greg Kroah-Hartman --- kernel/fork.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/kernel/fork.c b/kernel/fork.c index 6cabc12..755d816 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2513,6 +2513,16 @@ 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) -- 2.7.4