linux-kernel - Re: [PATCH tip v8] x86/setup: Use rng seeds from setup

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <ddba81dd-cc92-699c-5274-785396a17fb5@zytor.com>
Date:   Fri, 8 Jul 2022 18:51:16 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH tip v8] x86/setup: Use rng seeds from setup_data

On 7/8/22 04:39, Jason A. Donenfeld wrote:
> 
> diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
> index ca0796ac4403..2cbfe630230d 100644
> --- a/arch/x86/include/uapi/asm/bootparam.h
> +++ b/arch/x86/include/uapi/asm/bootparam.h
> @@ -12,6 +12,7 @@
>   #define SETUP_JAILHOUSE			6
>   #define SETUP_CC_BLOB			7
>   #define SETUP_IMA			8
> +#define SETUP_RNG_SEED			9
>   
>   #define SETUP_INDIRECT			(1<<31)
>   

Just one miss here: you need to bump SETUP_TYPE_MAX. It is a bit more 
confusing than it needs to be that SETUP_INDIRECT sits in between, and 
honestly I think SETUP_TYPE_MAX shouldn't include the SETUP_INDIRECT 
bit; however, this is uapi and so we can't change that per se.

Perhaps we should do:

#define SETUP_ENUM_MAX	SETUP_RNG_SEED
#define SETUP_INDIRECT	(1<<31)
#define SETUP_TYPE_MAX	(SETUP_ENUM_MAX | SETUP_INDIRECT)

	-hpa