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
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