[2.6.25-rc5-mm1] regression: cannot run Postfix sendmail command as non-root

Tilman Schmidt
2008-03-13T20:14:30Z

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Am 11.03.2008 09:14 schrieb Andrew Morton:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25-rc5/2.6.25-rc5-mm1/

I'm noticing a strange effect with this:

On my openSUSE 10.3 development machine with SUSEs default MTA
Postfix installed, I occasionally send a pre-formatted mail by
feeding it directly into "/usr/sbin/sendmail -t". If I try that
while running a 2.6.25-rc5-mm1 kernel, I get:

ts@xenon:~/kernel> /usr/sbin/sendmail -t < patch-usb-reduce-syslog-clutter-v3
postdrop: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration
postdrop: fatal: parameter inet_interfaces: no local interface found for ::1
sendmail: warning: command "/usr/sbin/postdrop -r" exited with status 1
sendmail: fatal: ts(1000): unable to execute /usr/sbin/postdrop -r: Success
ts@xenon:~/kernel>

and unsurprisingly, the mail is not sent. If I do the same as root,
everything works as usual, there is no console output from the
sendmail command, and the mail goes out as it should. All other
networking applications appear to be running normally.

On a 2.6.25-rc5 (non-mm) kernel I do not need to run the sendmail
command as root. It works just as well if I run it as myself.

IPv6 is not in use on that machine. The Ethernet interface has
just the link local IPv6 address. Possibly relevant information:

ts@xenon:~> /sbin/ifconfig -a
eth0 Protokoll:Ethernet Hardware Adresse 00:19:D1:03:D8:FF
inet Adresse:192.168.59.102 Bcast:192.168.59.255 Maske:255.255.255.0
inet6 Adresse: fe80::219:d1ff:fe03:d8ff/64 Gültigkeitsbereich:Verbindung
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
RX packets:78 errors:0 dropped:0 overruns:0 frame:0
TX packets:145 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 Sendewarteschlangenlänge:100
RX bytes:9547 (9.3 Kb) TX bytes:17952 (17.5 Kb)
Speicher:92c00000-92c20000

lo Protokoll:Lokale Schleife
inet Adresse:127.0.0.1 Maske:255.0.0.0
inet6 Adresse: ::1/128 Gültigkeitsbereich:Maschine
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2 errors:0 dropped:0 overruns:0 frame:0
TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 Sendewarteschlangenlänge:0
RX bytes:100 (100.0 b) TX bytes:100 (100.0 b)

ts@xenon:~/kernel> ls -l /proc/net/if_inet6
-r--r--r-- 1 root root 0 13. Mär 19:26 /proc/net/if_inet6
ts@xenon:~> cat /proc/net/if_inet6
fe800000000000000219d1fffe03d8ff 02 40 20 80 eth0
00000000000000000000000000000001 01 80 10 80 lo
ts@xenon:~> uname -a
Linux xenon 2.6.25-rc5-mm1-testing #1 SMP PREEMPT Tue Mar 11 14:34:49 CET 2008 i686 i686 i386 GNU/Linux

As you see, I can cat /proc/net/if_inet6 as regular (non-root) user
just fine, even though Postfix complains it cannot access it.
The content of /proc/net/if_inet6 is identical if I cat it on
kernel 2.6.25-rc5 mainline.

CCing a selection of IPv6 networking related maintainer addresses.
If you need more information or want me to test something, let me
know.

HTH
T.

--
Tilman Schmidt E-Mail: tilman@imap.cc
Bonn, Germany
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