Re: [RFC][PATCH] objtool: STAC/CLAC validation
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From: hpa@zytor.com
Date: 2019-02-25 08:54:51
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On February 23, 2019 12:39:42 AM PST, Peter Zijlstra [off-list ref] wrote:
On Fri, Feb 22, 2019 at 03:39:48PM -0800, hpa@zytor.com wrote:quoted
Objtool could also detect CLAC-STAC or STAC-CLAC sequences without memory operations and remove them; don't know how often that happens, but I know it *does* happen.Objtool doesn't know about memops; that'd be a lot of work. Also, objtool doesn't actually rewrite the text, at best it could warn about such occurences.
It doesn't even have to change the text per se, just nullify the altinstr. -- Sent from my Android device with K-9 Mail. Please excuse my brevity. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel