CVE-2010-4258 Information
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The do_exit function in kernel/exit.c in the Linux kernel before 2.6.36.2 does not properly handle a KERNEL_DS get_fs value which allows local users to bypass intended access_ok restrictions overwrite arbitrary kernel memory locations and gain privileges by leveraging a (1) BUG (2) NULL pointer dereference or (3) page fault as demonstrated by vectors involving the clear_child_tid feature and the splice system call.
Reference
http://archives.neohapsis.com/archives/fulldisclosure/2010-12/0086.html http://blog.nelhage.com/2010/12/cve-2010-4258-from-dos-to-privesc/ http://code.google.com/p/chromium-os/issues/detail?id=10234 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=33dd94ae1ccbfb7bf0fb6c692bc3d1c4269e6177 http://googlechromereleases.blogspot.com/2011/01/chrome-os-beta-channel-update.html http://lists.fedoraproject.org/pipermail/package-announce/2010-December/052513.html http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00000.html http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00001.html http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00004.html http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00007.html http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00002.html http://marc.info/?l=linux-kernel&m=129117048916957&w=2 http://openwall.com/lists/oss-security/2010/12/02/2 http://openwall.com/lists/oss-security/2010/12/02/3 http://openwall.com/lists/oss-security/2010/12/02/4 http://openwall.com/lists/oss-security/2010/12/02/7 http://openwall.com/lists/oss-security/2010/12/08/4 http://openwall.com/lists/oss-security/2010/12/08/5 http://openwall.com/lists/oss-security/2010/12/08/9 http://openwall.com/lists/oss-security/2010/12/09/14 http://openwall.com/lists/oss-security/2010/12/09/4 http://secunia.com/advisories/42745 http://secunia.com/advisories/42778 http://secunia.com/advisories/42801 http://secunia.com/advisories/42932 http://secunia.com/advisories/43056 http://secunia.com/advisories/43291 http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.36.2 http://www.mandriva.com/security/advisories?name=MDVSA-2011:029 http://www.vupen.com/english/advisories/2010/3321 http://www.vupen.com/english/advisories/2011/0012 http://www.vupen.com/english/advisories/2011/0124 http://www.vupen.com/english/advisories/2011/0213 http://www.vupen.com/english/advisories/2011/0298 http://www.vupen.com/english/advisories/2011/0375 https://bugzilla.redhat.com/show_bug.cgi?id=659567 https://lkml.org/lkml/2010/12/1/543