Bug 144155 - binfmt_aout DoS
binfmt_aout DoS
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: kernel (Show other bugs)
2.1
i386 Linux
medium Severity medium
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Assigned To: Don Howard
Brian Brock
: Security
Depends On:
Blocks: 143573
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Reported: 2005-01-04 16:07 EST by Josh Bressers
Modified: 2007-11-30 17:06 EST (History)
2 users (show)

See Also:
Fixed In Version: RHSA-2006-0191
Doc Type: Bug Fix
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Last Closed: 2006-02-01 12:54:04 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Josh Bressers 2005-01-04 16:07:29 EST
Marcelo Tosatti brought this to the attention of vendor-sec

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

ChangeSet@1.1527.1.13, 2004-12-16 16:06:31-02:00, chrisw@osdl.org
  [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@1.1527.1.16, 2004-12-17 21:45:58-02:00, chrisw@osdl.org
  [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@osdl.org>
Comment 1 Ernie Petrides 2005-01-04 17:08:35 EST
Jim, note my comment in bug 144153.  I'm not sure if it applies to RHEL2.1.
Comment 2 Jim Paradis 2005-01-17 16:24:10 EST
The first changeset referenced above is applicable to AS2.1-i386.  The second
one is not, since it handles insert_vm_struct somewhat differently.
Comment 3 Don Howard 2005-10-17 14:51:03 EDT
The set_brk() patch is needed for aout and elf on pensacola.
Comment 7 Red Hat Bugzilla 2006-02-01 12:54:04 EST
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2006-0191.html

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