netdev - Re: [net-next PATCH] net: phy: aquantia: drop wrong endianness conversion for addr and CRC

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: Wed, 22 Nov 2023 10:23:47 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>, Andrew Lunn
 <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Robert Marko <robimarko@...il.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, kernel test robot
 <lkp@...el.com>
Subject: Re: [net-next PATCH] net: phy: aquantia: drop wrong endianness
 conversion for addr and CRC

On Wed, 22 Nov 2023 18:53:39 +0100 Christian Marangi wrote:
> So they DO get converted to the HOST endian on reading the firmware from
> an nvmem cell or a filesystem?

They don't get converted when "reading from nvmem / fs". 
They get converted when you do:

		word = get_unaligned((const u32 *)(data + pos));

get_unaligned() is basically:

#if BIGENDIAN
#define		get_unaligned	get_unaligned_be32
#else
#define		get_unaligned	get_unaligned_le32
#endif

so you'll get different behavior here depending on the CPU.