On Wed, Feb 21, 2007 at 04:04:41PM -0800, SADANAND Hegde (shegde) wrote:
> Hi,
>
> I am running Redhat Linux (2.6.14.3 Kernel) with
> util-vserver-0.30.210.
quite an old kernel, so an update to 2.6.19
would probably be advised ...
> After starting 2 Guest OS, from one Guest OS, I
> am able to lower the priority of a process running
> in the 2nd Guest OS using 'renice' command.
> This should not be possible, right?
hmm, why not? lowering the priority is nothing
which would hurt anybody but yourself, raising
the priority above the default OTOH is
> As I understand, raising priority and setting
> priority is controlled by the bcap SYS_NICE,
> and by default this should be off.
> But apparently this is not the case. I also
> tried adding ~SYS_NICE to bcap list in
> /etc/<guest-os-name>/bcapabilities file.
> But it does not make any difference.
# chcontext --xid 42 --secure -- sleep 100 &
# cat /proc/virtual/42/status
UseCnt: 3
Tasks: 1
Flags: 0000000602000000
BCaps: 00000000344c05ff
~~~~~~~~
CCaps: 0000000000000101
Spaces: 0c000000
http://linux-vserver.org/Capabilities_and_Flags
23 0x00800000 SYS_NICE
as you can see, SYS_NICE is not set, but similar
to normal Linux, lowering the priority (raising
the nice value) is permitted without SYS_NICE
> Should I do anything else to not allow raising
> priority ? or is this a bug in vserver?
so now it is raising priority? if that is indeed
the case (check the flags) please let me know
# renice -10 $$
renice: 2035: setpriority: Permission denied
> Any help in this regard is very much appreciated.
HTH,
Herbert
> Thanks,
> --Sadanand Hegde--
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