Bug 144526 - RLIMIT_MEMLOCK bypass and (2.6) unprivileged user DoS
Summary: RLIMIT_MEMLOCK bypass and (2.6) unprivileged user DoS
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 3
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Dave Jones
QA Contact: Brian Brock
URL:
Whiteboard: public=20060107,impact=moderate
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2005-01-07 22:13 UTC by Josh Bressers
Modified: 2015-01-04 22:15 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2005-01-11 02:56:11 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description Josh Bressers 2005-01-07 22:13:52 UTC 
*** This bug has been split off bug 144524 ***

------- Original comment by Josh Bressers (Security Response Team) on 2005.01.07
17:08 -------

This was reported by grsecurity to full-disclosure
http://lists.netsys.com/pipermail/full-disclosure/2005-January/030660.html

the 'culprit' patch is how the default RLIM_MEMLOCK and the privilege
to call mlockall have changed in 2.6.9. namely, the former has been
reduced to 32 pages while the latter has been relaxed to allow it for
otherwise unprivileged users if their RLIM_MEMLOCK is bigger than the
currently allocated vm. which is normally good enough, except as you
now know there's a path that can increase the allocated vm without
checking for RLIM_MEMLOCK.


The fix for this issue is attachment 109501 [details]
Comment 1 Josh Bressers 2005-01-07 22:15:30 UTC 
This issue should also affect FC2.
Comment 2 Dave Jones 2005-01-11 02:56:11 UTC 
fixed in todays updates.
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