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Commit 4f43cdc7 authored by Amanieu d'Antras's avatar Amanieu d'Antras Committed by Greg Kroah-Hartman
Browse files

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: default avatarAmanieu d'Antras <amanieu@gmail.com>
Cc: <stable@vger.kernel.org> # 5.3.x
Link: https://lore.kernel.org/r/20200102172413.654385-8-amanieu@gmail.com


Signed-off-by: default avatarChristian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3981d85a

kernel/fork.c

+10 −0
Original line number Diff line number Diff line
@@ -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)