Re: Kernel 3.3.0 autofs v5 packet size change

Re: Kernel 3.3.0 autofs v5 packet size change

[Ian Kent]

On Mon, 2012-02-27 at 09:46 +0800, Ian Kent wrote:
> Hi all,
> 
> Just a heads up for everyone regarding a recent kernel change.
> 
> The description from the autofs user space patch describes the issue:
> 
> "Kernel 3.3.0 has a patch to allow for the original missdesign of
> the autofs v5 kernel packet.
> 
> The problem is that while all the structure fields are alligned
> correctly structure allignment on x86-64 causes the packet size
> to be 4 bytes larger than on x86. So when running an x86 binary
> on an x86-64 install the packet size did not match causing user
> space pipe reads to hang."
> 
> If you are an upstream package maintainer and your distro is likley to
> migrate to kernel 3.3.0 or later or you are planning using kernel 3.3.0
> or later then you will need these patches:
> http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-add-kernel-verion-check-function.patch
> http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-allow-for-kernel-packet-size-change.patch

and, of course, a fix for mistakes I made:
http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-fix-allow-for-kernel-packet-size-change.patch

> 
> If you use rc kernels and you plan on using 3.3.0-rc5 you will also need
> commit 3c761ea05a8900a907f32b628611873f6bef24b2 from the linus kernel
> tree to fix a compile mistake.
> 
> Sorry for the inconvenience.
> Ian

Re: Kernel 3.3.0 autofs v5 packet size change

[Ian Kent]

On Mon, 2012-02-27 at 10:40 +0800, Ian Kent wrote:
> On Mon, 2012-02-27 at 09:46 +0800, Ian Kent wrote:
> > Hi all,
> > 
> > Just a heads up for everyone regarding a recent kernel change.
> > 
> > The description from the autofs user space patch describes the issue:
> > 
> > "Kernel 3.3.0 has a patch to allow for the original missdesign of
> > the autofs v5 kernel packet.
> > 
> > The problem is that while all the structure fields are alligned
> > correctly structure allignment on x86-64 causes the packet size
> > to be 4 bytes larger than on x86. So when running an x86 binary
> > on an x86-64 install the packet size did not match causing user
> > space pipe reads to hang."
> > 
> > If you are an upstream package maintainer and your distro is likley to
> > migrate to kernel 3.3.0 or later or you are planning using kernel 3.3.0
> > or later then you will need these patches:
> > http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-add-kernel-verion-check-function.patch
> > http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-allow-for-kernel-packet-size-change.patch
> 
> and, of course, a fix for mistakes I made:
> http://www.kernel.org/pub/linux/daemons/autofs/v5/patches-5.0.7/autofs-5.0.6-fix-allow-for-kernel-packet-size-change.patch
> 
> > 
> > If you use rc kernels and you plan on using 3.3.0-rc5 you will also need
> > commit 3c761ea05a8900a907f32b628611873f6bef24b2 from the linus kernel
> > tree to fix a compile mistake.

And now also, if you are using rc kernels for s390, you'll need commit
048cd4e51d24ebf7f3552226d03c769d6ad91658 as well.

> > 
> > Sorry for the inconvenience.
> > Ian
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe autofs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html