Bug 209436 - CVE-2006-5174 copy_from_user information leak on s390
CVE-2006-5174 copy_from_user information leak on s390
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel (Show other bugs)
3.0
s390 Linux
medium Severity high
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Assigned To: Jan Glauber
Brian Brock
impact=important,source=vendorsec,rep...
: Security
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2006-10-05 08:25 EDT by Marcel Holtmann
Modified: 2007-11-30 17:07 EST (History)
4 users (show)

See Also:
Fixed In Version: RHSA-2006-0710
Doc Type: Bug Fix
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Last Closed: 2006-10-19 08:46:35 EDT
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
testcase (413 bytes, text/x-csrc)
2006-10-13 12:38 EDT, Jan Glauber
no flags Details

  None (edit)
Description Marcel Holtmann 2006-10-05 08:25:28 EDT
Report from Martin Schwidefsky:

There is/has been a bug with copy_from_user on s390. The problem is that it does
not pad the kernel buffer with zeroes in case of a fault on the user address.
That allows a malicious user to read uninitialized kernel memory. The bug is
already fixed upstream:

http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=52149ba6b0ddf3e9d965257cc0513193650b3ea8
Comment 2 Marcel Holtmann 2006-10-12 10:08:48 EDT
Unfortunatly a bug crept into the bug fix for 2.4. The arguments of the mvcle
that is supposed to clear the kernel buffer have been swapped for 64 bit (the
code is fine for 31 bit).
Comment 6 Ernie Petrides 2006-10-13 17:52:28 EDT
A fix for this problem has just been committed to the RHEL3 E9
patch pool this evening (in kernel version 2.4.21-47.0.1.EL).
Comment 11 Red Hat Bugzilla 2006-10-19 08:46:36 EDT
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-2006-0710.html
Comment 12 Ernie Petrides 2006-11-01 18:55:37 EST
A fix for this problem has also been committed to the RHEL3 U9
patch pool this evening (in kernel version 2.4.21-47.3.EL).

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