[Bug runtime/9787] New: permissions error in staprun

["eugen at debian dot org" <sourceware-bugzilla at sourceware dot org>]

There is some strange error in 20090124 snapshot:

% uname -a
Linux loki 2.6.29-rc2 #1 SMP PREEMPT Sun Jan 18 18:40:46 CET 2009 x86_64 GNU/Linux
% id
uid=1000(eugen) gid=1000(eugen)
groups=0(root),20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),116(stapdev),1000(eugen)
% ls -l /usr/bin/staprun
-rwsr-xr-x 1 root root 31752 Ñ?Ñ?Ñ? 25 03:10 /usr/bin/staprun
% ./helloworld.stp -v
Pass 1: parsed user script and 47 library script(s) in 280usr/0sys/304real ms.
Pass 2: analyzed script: 1 probe(s), 1 function(s), 0 embed(s), 0 global(s) in
10usr/0sys/4real ms.
Pass 3: using cached
/home/eugen/.systemtap/cache/11/stap_11c0f8dddd8437f12d5b2ecdd542a4fd_325.c
Pass 4: using cached
/home/eugen/.systemtap/cache/11/stap_11c0f8dddd8437f12d5b2ecdd542a4fd_325.ko
Pass 5: starting run.
Error inserting module
'/tmp/stapJa73Uz/stap_11c0f8dddd8437f12d5b2ecdd542a4fd_325.ko': File exists
Retrying, after attempted removal of module
stap_11c0f8dddd8437f12d5b2ecdd542a4fd_325 (rc 0)
hello world
ERROR: The effective user ID of staprun must be set to the root user.
  Check permissions on staprun and ensure it is a setuid root program.
Pass 5: run completed in 0usr/10sys/122real ms.
Pass 5: run failed.  Try again with another '--vp 00001' option.

Here staprun is suid-root, and stap is able to run staprun ad it canremove old
module and load new one (it displays "hello world"), but after that staprun
complains that it is not suid-root and cannot remove the module.

Everything works fine when run under root.

I do not remember anything similar with 20090117 snapshot and 2.6.28 kernel.

-- 
           Summary: permissions error in staprun
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: eugen at debian dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=9787

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