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Open Source and information security mailing list archives
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Date: Sat, 30 May 2009 22:14:46 -0400 From: Rik van Riel <riel@...hat.com> To: "Larry H." <research@...reption.com> CC: linux-kernel@...r.kernel.org, linux-mm@...ck.org, Alan Cox <alan@...rguk.ukuu.org.uk>, pageexec@...email.hu, Linus Torvalds <torvalds@...l.org> Subject: Re: [PATCH] Use kzfree in mac80211 key handling to enforce data sanitization Larry H. wrote: > [PATCH] Use kzfree in mac80211 key handling to enforce data sanitization > > This patch replaces the kfree() calls within the mac80211 WEP RC4 key > handling and ieee80211 management APIs with kzfree(), to enforce > sanitization of the key buffer contents. > > This prevents the keys from persisting on memory, potentially > leaking to other kernel users after re-allocation of the memory by > the LIFO allocators, or in coldboot attack scenarios. Information can be > leaked as well due to use of uninitialized variables, or other bugs. > > This patch doesn't affect fastpaths. This seems to be essentially what Ingo proposed. Clearing out a buffer that held a wifi key on free makes sense, even for systems that are not in paranoid mode. > Signed-off-by: Larry Highsmith <research@...reption.com> Acked-by: Rik van Riiel <riel@...hat.com> -- All rights reversed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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