Re: depmod -a and non-default umask

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Hi Josh,

On Wed, Jan 16, 2013 at 11:55 AM, Josh Boyer <jwboyer@xxxxxxxxx> wrote:
> On Tue, Jan 8, 2013 at 9:55 AM, Josh Boyer <jwboyer@xxxxxxxxx> wrote:
>> Hello,
>>
>> We've had a report[1] that depmod -a with a non-default umask (0027 in
>> this case) can leave the produced modules.* files with permissions other
>> than 0644.  Now, this isn't really a bug because depmod is already
>> explicit with its permissions and open/openat honor umask.  It can,
>> however, leave a machine in a state where non-root users can't read those
>> files.
>>
>> I'm curious if people think depmod should set its own explicit umask to
>> ensure the file permissions are set to 0644.  If so, I could create a
>> patch to do this rather quickly.  I wanted to get the upstream opinion on
>> this situation first though.
>
> Any thoughts at all?

Sorry for the delay.

I think it's weird to set the umask so files are not created with read
permission for users and then complain that depmod did exactly that.
How do I know if he indeed want to allow the user to run modinfo and
other tools that doesn't require privilege?  After all if we reset the
umask I don't want to receive bug reports by users complaining they
told not to create file that way and that we are not honoring that.

That said, I never saw such a setup but if it's common to do this we
could think about resetting the umask.  Does any distro ship with that
umask by default?

Lucas De Marchi
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