On 08/22/2011 01:33 PM, Stephen Smalley wrote:
> On Mon, 2011-08-22 at 13:26 -0400, Eric Paris wrote:
>> On Tue, May 3, 2011 at 11:33 AM, Stephen Smalley <sds@xxxxxxxxxxxxx> wrote:
>>> On Tue, 2011-05-03 at 10:50 -0400, Daniel J Walsh wrote:
>>
>>>> NOTE: We added the check for RO, to allow tools like mock to be able to
>>>> tell a chroot that SELinux is disabled while enforcing it outside the
>>>> chroot.
>>>>
>>>>
>>>> # getenforce
>>>> Enabled
>>>> # mount -t selinuxfs -o remount,ro selinuxfs /var/chroot/selinux
>>>
>>> Just to clarify, the right commands to use are:
>>> mount --bind /selinux /var/chroot/selinux
>>> mount -o remount,ro /var/chroot/selinux
>>>
>>> Do not use:
>>> mount -t selinuxfs -o ro selinuxfs /var/chroot/selinux
>>> as this will in fact change the flags on /selinux as well. Surprise!
>>> Result of there only being a single instance (superblock) of selinuxfs,
>>> although you can have multiple vfsmounts of it.
>>
>> surprise, this doesn't work either!
>> # cat mount.F16 | grep selinux
>> mount --bind /selinux /mnt/F16/sys/fs/selinux/
>> mount -o remount,ro /mnt/F16/sys/fs/selinux/
>>
>> # cat /proc/mounts | grep selinux
>> selinuxfs /selinux selinuxfs ro,relatime 0 0
>> selinuxfs /mnt/F16/sys/fs/selinux selinuxfs ro,relatime 0 0
>>
>> crap.
>
> Hmmm...works for me on F14 (yeah, I know - ancient history).
>
> # mkdir -p /var/chroot/selinux
> # mount --bind /selinux /var/chroot/selinux
> # mount -o remount,ro /var/chroot/selinux
> # cat /proc/mounts | grep selinux
> none /selinux selinuxfs rw,relatime 0 0
> none /var/chroot/selinux selinuxfs ro,relatime 0 0
> # echo 0 > /selinux/enforce
> # echo 0 > /var/chroot/selinux/enforce
> bash: /var/chroot/selinux/enforce: Read-only file system
>
> Did something change recently in the kernel or mount?
mount(8)
under F15 mount does:
mount("selinuxfs", "/mnt/F16/sys/fs/selinux", 0x7f613d1ce7b0,
MS_RDONLY|MS_REMOUNT|MS_RELATIME, NULL) = 0
whereas under F14 mount does:
mount("/sleinux", "/var/chroot/selinux", 0x7ff5f154ea69,
NS_MGC_VAL|MS_RDONLY|MS_REMOUNT|MS_BIND, NULL) = 0
under F15 I can get it to work if I use the command:
mount -o remount,ro,bind /var/chroot/selinux
now for me to hunt down who owns mount(8)
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