[systemd-devel] systemd-cgls - Memory overflow

[Sven Anders]

Am 10.05.2012 22:33, schrieb Michal Schmidt:
> On 05/10/2012 02:45 PM, Sven Anders wrote:
>> If I execute the "systemd-cgls" command, I see the tree but without
>> the command lines of the executables. I only see "n/a".
> 
>> open("/proc/300/cmdline", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 7
>> mmap2(NULL, 1075859456, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cann
>> ot allocate memory)
> 
> Do you have the COLUMNS environment variable set to some interesting value? Does it work if you set it to something sane?:
> COLUMNS=80 systemd-cgls

COLUMNS is set to 80, so that's not the problem.

What I find curious is, that it reads the correct command line and then opens the
/proc file again, but this time it fails. What happened to the first read?

I checked the code, but could not see any reason for this on the first look.

I did not see any mmap in the code causing this nor any reason, why this should be
triggered by any libc function...

Regards
 Sven Anders

-- 
 Sven Anders <anders at anduras.de>                 () UTF-8 Ribbon Campaign
                                                 /\ Support plain text e-mail
 ANDURAS intranet security AG
 Messestrasse 3 - 94036 Passau - Germany
 Web: www.anduras.de - Tel: +49 (0)851-4 90 50-0 - Fax: +49 (0)851-4 90 50-55

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety.
  - Benjamin Franklin
-------------- next part --------------
A non-text attachment was scrubbed...
Name: anders.vcf
Type: text/x-vcard
Size: 352 bytes
Desc: not available
URL: <http://lists.freedesktop.org/archives/systemd-devel/attachments/20120510/04a98dcc/attachment.vcf>