Re: [gentoo-user] /dev/shm permissions drwxr-xr-x root:root ?

[Dale]

Walter Dnes wrote:
> On Fri, Dec 28, 2012 at 07:23:33PM -0600, Dale wrote
>
>> Here is some info on mine, while you are waiting on William.
>>
>> root@fireball / # ls -al /dev/shm
>> total 4
>> drwxrwxrwt  2 root root    60 Dec  3 18:20 .
>> drwxr-xr-x 17 root root  4360 Dec 28 15:30 ..
>> -rwxr-xr-x  1 dale users   32 Dec  3 18:20 sem.lastpassffsemaphore
>> root@fireball / # equery list udev
>>  * Searching for udev ...
>> [IP-] [  ] sys-fs/udev-171-r9:0
>> root@fireball / #
>>
>> Does that help any?  If I read that correctly, it is executable.  At
>> least it is for the one that is there.
>   Can you create the sample script on /dev/shm, chmod it 755, and try
> to run it.  The "noexec" mount option over-rides attributes that chmod
> sets.  E.g. on my machine...
>
> [d531][waltdnes][~] chmod 744 /dev/shm/hw
> [d531][waltdnes][~] ll /dev/shm/hw
> -rwxr--r-- 1 waltdnes users 32 Dec 27 19:10 /dev/shm/hw
> [d531][waltdnes][~] /dev/shm/hw
> bash: /dev/shm/hw: Permission denied
> [d531][waltdnes][~]
>

Mine does this:

root@fireball / # chmod 755 /dev/shm/hello
root@fireball / # /dev/shm/hello
-su: /dev/shm/hello: Permission denied
root@fireball / # ls -al /dev/shm/hello 
-rwxr-xr-x 1 root root 31 Dec 28 23:08 /dev/shm/hello
root@fireball / #  cat /etc/fstab | grep shm
# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for 
# POSIX shared memory (shm_open, shm_unlink).
shm                     /dev/shm        tmpfs           nodev,nosuid,noexec     0 0
root@fireball / #

So I get permission denied too.  I did that as root to I might add in
case you don't notice.

That help?

Dale

:-)  :-) 

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