Bug 144173

Summary:	binfmt_aout DoS
Product:	[Fedora] Fedora	Reporter:	Josh Bressers <bressers>
Component:	kernel	Assignee:	Dave Jones <davej>
Status:	CLOSED NOTABUG	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	3	CC:	pfrields, riel, wtogami
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-01-04 21:47:37 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Josh Bressers 2005-01-04 21:47:00 UTC

Marcelo Tosatti brought this to the attention of vendor-sec

The recent binfmt_aout v2.6 backport changes also fix a DoS:

ChangeSet.1.13, 2004-12-16 16:06:31-02:00, chrisw
  [PATCH] a.out: error check on set_brk

  It's possible for do_brk() to fail during set_brk() when exec'ing and
  a.out.  This was noted with Florian's a.out binary and overcommit set to
  0.

  Capture this error and terminate properly.

ChangeSet.1.16, 2004-12-17 21:45:58-02:00, chrisw
  [PATCH] Backport of 2.6 fix to insert_vm_struct to make it return an error
rather than BUG().

  Backport of 2.6 fix to insert_vm_struct to make it return an error
  rather than BUG().  This eliminates a user triggerable BUG() when user
  created a large vma that overlapped with arg pages during exec (could be
  triggered with a.out on i386 and x86_64 and elf on ia64).

  Signed-off-by: Chris Wright <chrisw>


This issue should also affect FC2

Comment 1 Josh Bressers 2005-01-04 21:47:37 UTC

A second look tells me we're OK.