diff options
| author | Amanieu d'Antras <amanieu@gmail.com> | 2020-01-02 18:24:13 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-14 20:08:35 +0100 |
| commit | 4f43cdc72331bdbf3562d266969779aed7a834af (patch) | |
| tree | 676c15f1a8e71eb59e2f4bc1f4ef6e4fe5635efa /kernel/fork.c | |
| parent | 3981d85a91824e529de5ee5128ec0b5bb63d1a42 (diff) | |
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 <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: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 6cabc124378c..755d8160e001 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) |