linux-kernel - Re: [PATCH] x86/retpoline: Also fill return buffer after idle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 8 Jan 2018 16:24:07 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     Andi Kleen <andi@...stfloor.org>, pjt@...gle.com,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        gregkh@...ux-foundation.org, tim.c.chen@...ux.intel.com,
        dave.hansen@...el.com, tglx@...utronix.de, peterz@...radead.org,
        luto@...capital.net
Subject: Re: [PATCH] x86/retpoline: Also fill return buffer after idle

> Probably doesn't matter right there but it's going to end up being used
> elsewhere with IBRS/IBPB, and the compiler is going to think it needs
> to save all the call-clobbered registers for that. Do we want to make
> it use inline asm instead?

You mean KVM?

All the other places have lots of other calls too, so the registers are likely 
already clobbered.

-Andi