linux-kernel - Re: [PATCH v8 05/18] liveupdate: luo

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] [day] [month] [year] [list]

Message-ID: <20260107182713.GF293394@nvidia.com>
Date: Wed, 7 Jan 2026 14:27:13 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: pratyush@...nel.org, jasonmiu@...gle.com, graf@...zon.com,
	rppt@...nel.org, dmatlack@...gle.com, rientjes@...gle.com,
	corbet@....net, rdunlap@...radead.org,
	ilpo.jarvinen@...ux.intel.com, kanie@...ux.alibaba.com,
	ojeda@...nel.org, aliceryhl@...gle.com, masahiroy@...nel.org,
	akpm@...ux-foundation.org, tj@...nel.org, yoann.congal@...le.fr,
	mmaurer@...gle.com, roman.gushchin@...ux.dev, chenridong@...wei.com,
	axboe@...nel.dk, mark.rutland@....com, jannh@...gle.com,
	vincent.guittot@...aro.org, hannes@...xchg.org,
	dan.j.williams@...el.com, david@...hat.com,
	joel.granados@...nel.org, rostedt@...dmis.org,
	anna.schumaker@...cle.com, song@...nel.org, linux@...ssschuh.net,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-mm@...ck.org, gregkh@...uxfoundation.org, tglx@...utronix.de,
	mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
	x86@...nel.org, hpa@...or.com, rafael@...nel.org, dakr@...nel.org,
	bartosz.golaszewski@...aro.org, cw00.choi@...sung.com,
	myungjoo.ham@...sung.com, yesanishhere@...il.com,
	Jonathan.Cameron@...wei.com, quic_zijuhu@...cinc.com,
	aleksander.lobakin@...el.com, ira.weiny@...el.com,
	andriy.shevchenko@...ux.intel.com, leon@...nel.org, lukas@...ner.de,
	bhelgaas@...gle.com, wagi@...nel.org, djeffery@...hat.com,
	stuart.w.hayes@...il.com, ptyadav@...zon.de, lennart@...ttering.net,
	brauner@...nel.org, linux-api@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, saeedm@...dia.com,
	ajayachandra@...dia.com, parav@...dia.com, leonro@...dia.com,
	witu@...dia.com, hughd@...gle.com, skhawaja@...gle.com,
	chrisl@...nel.org
Subject: Re: [PATCH v8 05/18] liveupdate: luo_core: add user interface

On Tue, Nov 25, 2025 at 11:58:35AM -0500, Pasha Tatashin wrote:
> +struct liveupdate_ioctl_create_session {
> +	__u32		size;
> +	__s32		fd;
> +	__u8		name[LIVEUPDATE_SESSION_NAME_LENGTH];
> +};

IMHO I would use

 __u32 name_len;
 __u32 reserved;
 __aligned_u64 name_uptr;

And then have the kernel copy_from_user() the name into kernel
memory. That way you avoid making LIVEUPDATE_SESSION_NAME_LENGTH into
strict ABI.

I have also been marking the output members with out_, so:

	__s32		out_fd;

for example

Jason