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@gmail.com Cc: stable@vger.kernel.org # 5.3.x --- kernel/fork.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/kernel/fork.c b/kernel/fork.c index 2508a4f238a3..080809560072 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)