From: Sasha Levin Date: Mon, 29 Dec 2014 14:39:01 +0000 (-0500) Subject: KEYS: close race between key lookup and freeing X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~317^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a3a8784454692dd72e5d5d34dcdab17b4420e74c;p=pandora-kernel.git KEYS: close race between key lookup and freeing When a key is being garbage collected, it's key->user would get put before the ->destroy() callback is called, where the key is removed from it's respective tracking structures. This leaves a key hanging in a semi-invalid state which leaves a window open for a different task to try an access key->user. An example is find_keyring_by_name() which would dereference key->user for a key that is in the process of being garbage collected (where key->user was freed but ->destroy() wasn't called yet - so it's still present in the linked list). This would cause either a panic, or corrupt memory. Fixes CVE-2014-9529. Signed-off-by: Sasha Levin Signed-off-by: David Howells --- Reading git-diff-tree failed