KEYS: Change the name of the dead type to ".dead" to prevent user access
commitsteinar/wifi_calib_4_9_kernelc1644fe041
upstream. This fixes CVE-2017-6951. Userspace should not be able to do things with the "dead" key type as it doesn't have some of the helper functions set upon it that the kernel needs. Attempting to use it may cause the kernel to crash. Fix this by changing the name of the type to ".dead" so that it's rejected up front on userspace syscalls by key_get_type_from_user(). Though this doesn't seem to affect recent kernels, it does affect older ones, certainly those prior to: commitc06cfb08b8
Author: David Howells <dhowells@redhat.com> Date: Tue Sep 16 17:36:06 2014 +0100 KEYS: Remove key_type::match in favour of overriding default by match_preparse which went in before 3.18-rc1. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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a5c6e0a768
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b2dd90e812
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@ -46,7 +46,7 @@ static unsigned long key_gc_flags;
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* immediately unlinked.
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*/
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struct key_type key_type_dead = {
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.name = "dead",
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.name = ".dead",
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};
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/*
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