From: Wolfgang Walter <linux@stwm.de>
To: stable@vger.kernel.org
Cc: gregkh@linuxfoundation.org,
Ben Hutchings <ben.hutchings@codethink.co.uk>,
linux-kernel@vger.kernel.org
Subject: Re: NFS: regression in stable kernel 4.9.78 from 4.9.75
Date: Mon, 29 Jan 2018 14:42:49 +0100 [thread overview]
Message-ID: <3821612.ct3L5FXvrM@stwm.de> (raw)
In-Reply-To: <2316958.ApAh1ic5rg@stwm.de>
Hello!
Am Montag, 29. Januar 2018, 13:22:49 schrieb Wolfgang Walter:
> Hello,
>
> after upgrading our nfs-server from 4.9.75 to 4.9.78 group permissions stop
> working (for clients). If you need group permissions to access a file or
> directory, sometimes access is granted, but rather often denied. Often
> access to the same object is denied within seconds after access was granted
> in an earlier access. user permissions work fine.
>
> Downgrading to 4.9.75 fixes the issue.
>
> We use kerberos.
>
> Regards,
This seems to be fixed in 4.15 with commit
1995266727fa8143897e89b55f5d3c79aa828420:
commit 1995266727fa8143897e89b55f5d3c79aa828420
Author: Ben Hutchings <ben.hutchings@codethink.co.uk>
Date: Mon Jan 22 20:11:06 2018 +0000
nfsd: auth: Fix gid sorting when rootsquash enabled
Commit bdcf0a423ea1 ("kernel: make groups_sort calling a responsibility
group_info allocators") appears to break nfsd rootsquash in a pretty
major way.
It adds a call to groups_sort() inside the loop that copies/squashes
gids, which means the valid gids are sorted along with the following
garbage. The net result is that the highest numbered valid gids are
replaced with any lower-valued garbage gids, possibly including 0.
We should sort only once, after filling in all the gids.
Fixes: bdcf0a423ea1 ("kernel: make groups_sort calling a responsibility
...")
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
So this should be applied to stables 4.4, 4.9 and 4.14 (and others where
bdcf0a423ea1 has been backported to).
Regards,
--
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
WARNING: multiple messages have this Message-ID (diff)
From: Wolfgang Walter <linux@stwm.de>
To: stable@vger.kernel.org
Cc: gregkh@linuxfoundation.org,
Ben Hutchings <ben.hutchings@codethink.co.uk>,
linux-kernel@vger.kernel.org
Subject: Re: NFS: regression in stable kernel 4.9.78 from 4.9.75
Date: Mon, 29 Jan 2018 14:42:49 +0100 [thread overview]
Message-ID: <3821612.ct3L5FXvrM@stwm.de> (raw)
In-Reply-To: <2316958.ApAh1ic5rg@stwm.de>
Hello!
Am Montag, 29. Januar 2018, 13:22:49 schrieb Wolfgang Walter:
> Hello,
>
> after upgrading our nfs-server from 4.9.75 to 4.9.78 group permissions stop
> working (for clients). If you need group permissions to access a file or
> directory, sometimes access is granted, but rather often denied. Often
> access to the same object is denied within seconds after access was granted
> in an earlier access. user permissions work fine.
>
> Downgrading to 4.9.75 fixes the issue.
>
> We use kerberos.
>
> Regards,
This seems to be fixed in 4.15 with commit
1995266727fa8143897e89b55f5d3c79aa828420:
commit 1995266727fa8143897e89b55f5d3c79aa828420
Author: Ben Hutchings <ben.hutchings@codethink.co.uk>
Date: Mon Jan 22 20:11:06 2018 +0000
nfsd: auth: Fix gid sorting when rootsquash enabled
Commit bdcf0a423ea1 ("kernel: make groups_sort calling a responsibility
group_info allocators") appears to break nfsd rootsquash in a pretty
major way.
It adds a call to groups_sort() inside the loop that copies/squashes
gids, which means the valid gids are sorted along with the following
garbage. The net result is that the highest numbered valid gids are
replaced with any lower-valued garbage gids, possibly including 0.
We should sort only once, after filling in all the gids.
Fixes: bdcf0a423ea1 ("kernel: make groups_sort calling a responsibility
...")
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Acked-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
So this should be applied to stables 4.4, 4.9 and 4.14 (and others where
bdcf0a423ea1 has been backported to).
Regards,
--
Wolfgang Walter
Studentenwerk M�nchen
Anstalt des �ffentlichen Rechts
next prev parent reply other threads:[~2018-01-29 13:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-29 12:22 NFS: regression in stable kernel 4.9.78 from 4.9.75 Wolfgang Walter
2018-01-29 12:37 ` Greg KH
2018-01-29 13:42 ` Wolfgang Walter [this message]
2018-01-29 13:42 ` Wolfgang Walter
2018-01-29 13:54 ` Greg KH
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