This is a note to let you know that I've just added the patch titled um: Skip futex_atomic_cmpxchg_inatomic() test to the 3.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: um-skip-futex_atomic_cmpxchg_inatomic-test.patch and it can be found in the queue-3.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From f911d731054ab3d82ee72a16b889e17ca3a2332a Mon Sep 17 00:00:00 2001 From: Richard Weinberger <richard@xxxxxx> Date: Wed, 10 Dec 2014 13:53:51 +0100 Subject: um: Skip futex_atomic_cmpxchg_inatomic() test From: Richard Weinberger <richard@xxxxxx> commit f911d731054ab3d82ee72a16b889e17ca3a2332a upstream. futex_atomic_cmpxchg_inatomic() does not work on UML because it triggers a copy_from_user() in kernel context. On UML copy_from_user() can only be used if the kernel was called by a real user space process such that UML can use ptrace() to fetch the value. Reported-by: Miklos Szeredi <miklos@xxxxxxxxxx> Suggested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Signed-off-by: Richard Weinberger <richard@xxxxxx> Tested-by: Daniel Walter <d.walter@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/um/Kconfig.common | 1 + 1 file changed, 1 insertion(+) --- a/arch/um/Kconfig.common +++ b/arch/um/Kconfig.common @@ -8,6 +8,7 @@ config UML default y select HAVE_GENERIC_HARDIRQS select HAVE_UID16 + select HAVE_FUTEX_CMPXCHG if FUTEX select GENERIC_IRQ_SHOW select GENERIC_CPU_DEVICES select GENERIC_IO Patches currently in stable-queue which might be from richard@xxxxxx are queue-3.10/x86-um-actually-mark-system-call-tables-readonly.patch queue-3.10/um-skip-futex_atomic_cmpxchg_inatomic-test.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html