[debbugs-tracker] bug#37569: closed (Mount does not honor 'user' option.)

[GNU bug Tracking System]

Your message dated Sun, 06 Oct 2019 14:46:13 +0200
with message-id <address@hidden>
and subject line Re: bug#37569: Mount does not honor 'user' option.
has caused the debbugs.gnu.org bug report #37569,
regarding Mount does not honor 'user' option.
to be marked as done.

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37569: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=37569
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> --- Begin Message ---
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>
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> Subject: 
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> Mount does not honor 'user' option.
>
>
>
>
> Date: 
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> Tue, 01 Oct 2019 15:41:59 +0200
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>
> User-agent: 
>
> Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)
>
>
>
>
> Hey Guix,
>
> I have added the following to `file-systems' in my operating-system
> config:
>
> --8<---------------cut here---------------start------------->8---
> (file-system                                                                   
>   (device "127.0.0.1")                                                         
>   (mount-point "/home/diego/inf")                                              
>   (type "9p")                                                                  
>   (options "noextend,trans=tcp,dfltuid=1000,dfltgid=998,port=9001,user,nofail")
>   (mount? #f))
> --8<---------------cut here---------------end--------------->8---
>
> It works almost as expected except that when I try to mount the file
> system as a regular user (which is what the option 'user' is supposed to
> allow) I get:
>
>   $ LC_ALL=C mount inf
>   mount: /home/diego/inf: must be superuser to use mount.
>
> The command succeeds if I run it as root.
>
> The following steps reproduce the issue without using a 9p file system:
>
> 1. Prepare a file system on a loopback device:
>
>   $ dd if=/dev/zero of=foo.img bs=1024 count=524288
>   $ udisksctl loop-setup --file foo.img
>   Mapped file foo.img as /dev/loop0.
>   $ sudo mkfs.ext4 -L foofs /dev/loop0
>
> 2. Add the following line to /etc/fstab replacing <name> with something
> more appropriate:
>
>   LABEL=foofs /home/<name>/foofs ext4 defaults,user
>
> 3. Try to mount the filesystem as an unprivileged user (This should work
> and does work on e.g. Debian 10):
>
>   $ mkdir foofs
>   $ LC_ALL=C mount foofs
>   mount: /home/<name>/foofs: must be superuser to use mount.
>
> 4. Try it with sudo to confirm that everything else works as expected:
>
>   $ sudo mount foofs
>   $ ls foofs
>   lost+found/
>
> Regards,
>
> Diego
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#37569: Mount does not honor 'user' option.
>
>
>
>
> Date: 
>
> Sun, 06 Oct 2019 14:46:13 +0200
>
>
>
>
> User-agent: 
>
> Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)
>
>
>
>
> Hi,
>
> Diego Nicola Barbato <address@hidden> skribis:
>
> > I've tried adding "mount" and "umount" to `setuid-programs' in my
> > operating-system config:
> >
> > (setuid-programs (cons*                                       
> >                   #~(string-append #$util-linux "/bin/mount") 
> >                   #~(string-append #$util-linux "/bin/umount")
> >                   %setuid-programs))
> >
> > Mounting as an unprivileged user now works as expected (even the fancy
> > 9p stuff).
>
> Cool!
>
> > Is there any rationale for not adding "mount" and "umount" to
> > `%setuid-programs' by default?
>
> No, especially since they perform the right checks and error out with
> “only root can do that” when needed.
>
> I added them in commit 19944227528502e3619a6d1557bc735224f6fef6.
>
> Thanks!
>
> Ludo’.
>
>
> --- End Message ---