Bug 439754 - (CVE-2008-1375) CVE-2008-1375 kernel: race condition in dnotify (local DoS, local roothole possible)
CVE-2008-1375 kernel: race condition in dnotify (local DoS, local roothole po...
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
high Severity high
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Assigned To: Red Hat Product Security
: Security
Depends On: 439755 439756 439757 439758 439759
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Reported: 2008-03-31 03:22 EDT by Jan Lieskovsky
Modified: 2010-12-21 12:15 EST (History)
9 users (show)

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Doc Type: Bug Fix
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Last Closed: 2010-12-21 12:15:58 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Jan Lieskovsky 2008-03-31 03:22:07 EDT
Description of problem:

Alexander Viro has reported the following serious Linux kernel issue:


 fcntl_dirnotify() adds an element to inode->i_dnotify. It contains
a reference to struct file and to struct files_struct (both not contributing
to refcounts). filp_close() (called when reference to file is removed
from descriptor table) purges element with file/descriptor table in question
from ->i_dnotify. The problem is, fcntl() can race with close() from another
thread, inserting element *after* close() is finished. If that happens,
the sucker is stuck there forever, long after the struct file it refers
to had been freed/reused/etc. Actually, even having the (in-core) inode
freed and reused doesn't clean it up - "->i_dnotify is empty on allocated
inode" is guaranteed by slab constructor; freeing and reallocating won't
touch it at all, since the list must have been emptied before we'd dropped
the final reference to inode.


NOTE:  Please note this issue is NOT public yet, so handle each information
=====  about this one as confidential.
Comment 7 Fedora Update System 2008-05-14 17:31:54 EDT
kernel- has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 8 Vincent Danen 2010-12-21 12:15:58 EST
This was addressed via:

Red Hat Enterprise Linux version 3 (RHSA-2008:0211)
Red Hat Enterprise Linux version 5 (RHSA-2008:0233)
Red Hat Enterprise Linux version 4 (RHSA-2008:0237)

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