Bug 191727 - Nasty ncpfs symlink handling bug
Nasty ncpfs symlink handling bug
Status: CLOSED WONTFIX
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: kernel (Show other bugs)
3.0
All Linux
medium Severity low
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Assigned To: Peter Staubach
Brian Brock
: Security
Depends On:
Blocks:
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Reported: 2006-05-15 10:59 EDT by Marcel Holtmann
Modified: 2007-11-30 17:07 EST (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2006-05-15 15:41:44 EDT
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Description Marcel Holtmann 2006-05-15 10:59:33 EDT
This bug could cause oopses and page state corruption, because ncpfs used the
generic page-cache symlink handlign functions. But those functions only work if
the page cache is guaranteed to be "stable", ie a page that was installed when
the symlink walk was started has to still be installed in the page cache at the
end of the walk.

The upstream fix for 2.6 can be found here:

http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cc314eef0128a807e50fa03baf2d0abc0647952c

It is not fully clear if this has a security implication at all and it got fixed
only in the 2.6 kernel series. However RHEL3 supports ncpfs and thus this needs
some investigation.
Comment 1 Ernie Petrides 2006-05-15 15:41:44 EDT
I've just discovered that "ncpfs" is in the RHEL3 kernel's "unsupported" list.

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