Re: [gentoo-user] /dev/shm mode 1777

[Mike Gilbert <floppym@gentoo.org>]

On Fri, Oct 3, 2014 at 11:42 PM, Joseph <syscon780@gmail.com> wrote:
> On 10/03/14 23:00, Mike Gilbert wrote:
>>
>> On Fri, Oct 3, 2014 at 10:22 PM, Joseph <syscon780@gmail.com> wrote:
>>>
>>> I'm getting an error message during emerge:
>>> * configure has detected that the sem_open function is broken.
>>> * Please ensure that /dev/shm is mounted as a tmpfs with mode 1777.
>>> * ERROR: dev-lang/python-3.3.5-r1::gentoo failed (configure phase):
>>>
>>> my /dev/shm is mounted as drwxr-xr-x 17 root root          4020 Oct  3
>>> 08:57
>>> shm
>>>
>>> and it should be:
>>> drwxrwxrwt  2 root root           100 Sep 29 09:25 shm
>>>
>>> I've already change in fstab:
>>> from:
>>> shm                     /dev/shm        devtmpfs
>>> nodev,nosuid,noexec
>>> 0 0
>>>
>>> to:
>>> shm                     /dev/shm        tmpfs
>>> defaults,nodev,nosuid,mode=1777 0 0
>>>
>>> Is it OK to run:
>>> umount shm
>>> mount shm
>>>
>>> This is a remount system, so I want to make sure I'm not making a
>>> mistake.
>>>
>>
>> Yes, that should be fairly safe to run. The only risk is if you have
>> some application running which has files open on it; but umount should
>> give you an error in that case.
>>
>> Also, you can/should remove that fstab entry entirely once you have
>> remounted it; both openrc and systemd will automatically mount
>> /dev/shm with proper permissions if it is missing from fstab.
>
>
> Will it?
> In my kernel confg I have:
>
> grep CONFIG_DEVTMPFS  /usr/src/linux/.config CONFIG_DEVTMPFS=y
> # CONFIG_DEVTMPFS_MOUNT is not set
>
> should I set "CONFIG_DEVTMPFS_MOUNT=y"
>

It has nothing to do with that kernel option.