[lkml]   [2005]   [Jan]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subjectlinux capabilities ?

I have been playing a little here and there with linux capabilities, and
seem to be hitting a few snags so I was hoping to obtain some input on
their current status. The kernel on the box in question is 2.6.10, with
the CAP_INIT_EFF_SET macro modified to allow init to have CAP_SETPCAP.

I am mostly trying to accomplish this so that I can run syslog as a
non-root user and as I understand it by digging through the source, one
should be able to accomplish this with the CAP_SYS_ADMIN capability-
however this does not appear to be true ?

in kernel/printk.c I see

error = security_syslog(type)
if (error)
return error ;

which is defined in something like include/linux/security.h as a pointer
to cap_syslog(), which in turn is defined in security/commoncap.c where I

if ((type != 3 && type != 10) && !capable(CAP_SYS_ADMIN))
return -EPERM
return 0;

Type 3 is:
* 3 -- Read up to the last 4k of messages in the ring buffer.

So when I give the process CAP_SYS_ADMIN I still cannot seem to read from
/proc/kmsg, I also tried giving it CAP_DAC_OVERRIDE just to test to see if
DAC's were the problem but that didn't seem to help any.

So with that said, anyone have any idea's as to what I need to do and any
details on the current state of the capabilities would be helpful.



To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:09    [W:0.047 / U:0.996 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site