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KEYS: Change the name of the dead type to ".dead" to prevent user access

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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:

	commit c06cfb08b8
	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>
cc: stable@vger.kernel.org
This commit is contained in:
David Howells 2017-04-18 15:31:08 +01:00
parent ee8f844e3c
commit c1644fe041
1 changed files with 1 additions and 1 deletions
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2
security/keys/gc.c
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@ -46,7 +46,7 @@ static unsigned long key_gc_flags;
* immediately unlinked.
*/
struct key_type key_type_dead = {
.name = "dead",
.name = ".dead",
};
/*