clone3: ensure copy_thread_tls is implemented
commit dd499f7a7e
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>
5.4-rM2-2.2.x-imx-squashed
parent
3981d85a91
commit
4f43cdc723
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@ -2513,6 +2513,16 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
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#endif
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#ifdef __ARCH_WANT_SYS_CLONE3
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/*
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* copy_thread implementations handle CLONE_SETTLS by reading the TLS value from
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* the registers containing the syscall arguments for clone. This doesn't work
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* with clone3 since the TLS value is passed in clone_args instead.
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*/
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#ifndef CONFIG_HAVE_COPY_THREAD_TLS
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#error clone3 requires copy_thread_tls support in arch
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#endif
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noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs,
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struct clone_args __user *uargs,
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size_t usize)
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