Date: Thu, 27 Oct 2011 17:10:07 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com CC: "Steven M. Christey" <coley@...us.mitre.org> Subject: CVE request: kernel: crypto: ghash: null pointer deref if no key is set Description from the commit: The ghash_update function passes a pointer to gf128mul_4k_lle which will be NULL if ghash_setkey is not called or if the most recent call to ghash_setkey failed to allocate memory. This causes an oops. Fix this up by returning an error code in the null case. This is trivially triggered from unprivileged userspace through the AF_ALG interface by simply writing to the socket without setting a key. The ghash_final function has a similar issue, but triggering it requires a memory allocation failure in ghash_setkey _after_ at least one successful call to ghash_update. References: https://bugzilla.redhat.com/show_bug.cgi?id=749475 https://secunia.com/advisories/46584/ https://bugs.gentoo.org/show_bug.cgi?id=388581 Upstream commit: http://git.kernel.org/linus/7ed47b7d142ec99ad6880bbbec51e9f12b3af74c +config CRYPTO_GHASH was added in commit 2cdc6899, v2.6.32-rc1. Thanks, Eugene -- Eugene Teo / Red Hat Security Response Team
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