I'm running cu as root and cu doesn't work because it changes its UID to
uucp instead of dialout. It is simple to change the owner and/or
permissions of the devices I use, but the behaviour of cu is still a
bug.
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Serial port devices (ttyS*) unaccessible from non-root accounts
Nicolas, you are not meant to run cu as root. Does it work if you run cu
as a normal user and this user is member of the dialout group?
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Serial port devices (ttyS*) unaccessible from non-root accounts
https://bugs.launchpad.net/bugs/255200
You received this bug notification because you are a
From looking at the forum postings the problem is that the users are
running the applications as root. If you run cu as root it will change
user to uucp which can not access the root:dialout port. cu is not
setuid, so running it with a dialout user should work fine.
Please reopen if this does not
The archived Ubuntu forum thread I linked to above has an strace for cu.
I continued the thread asking for assistance from other users here:
http://ubuntuforums.org/showthread.php?t=902590
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Serial port devices (ttyS*) unaccessible from non-root accounts
https://bugs.launchpad.net/bugs/255200
I'd recommend getting an strace of the applications in question to
figure out exactly which devices they're trying to access and what
errors they're failing with.
From the point of view of a process in group dialout, 660 root:dialout
and 666 root:dialout are precisely equivalent, so there is
By the way, the most likely cause is that something is running setuid to
a different user, or communicating with a process running as a different
user - and in that case Scott's answer will still be accurate if you
read it more closely (or that of the running daemon).
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Serial port devices
Place your user account, or that of the running daemon, in the dialout
group
** Changed in: udev (Ubuntu)
Status: New = Invalid
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Serial port devices (ttyS*) unaccessible from non-root accounts
https://bugs.launchpad.net/bugs/255200
You received this bug notification because you are a
Next time read the report:
This however is not enough for some serial
communication applications to access the devices from a non-root account
even if they are in the DIALOUT group.
--
Serial port devices (ttyS*) unaccessible from non-root accounts
https://bugs.launchpad.net/bugs/255200
You
** Changed in: udev (Ubuntu)
Status: Invalid = New
--
Serial port devices (ttyS*) unaccessible from non-root accounts
https://bugs.launchpad.net/bugs/255200
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs mailing
** Attachment added: 40-basic-permissions.rules.patch
http://launchpadlibrarian.net/16576439/40-basic-permissions.rules.patch
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Serial port devices (ttyS*) unaccessible from non-root accounts
https://bugs.launchpad.net/bugs/255200
You received this bug notification because you are a member
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