linux-kernel - Re: [PATCH v1] ARM: A9: Add ARM ERRATA 764319 workaround

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: <7C103AEB-3111-4AE6-9645-CF590388A879@hpe.com>
Date:   Tue, 10 May 2022 11:53:57 +0000
From:   "Verdun, Jean-Marie" <verdun@....com>
To:     Arnd Bergmann <arnd@...db.de>,
        "Hawkins, Nick" <nick.hawkins@....com>
CC:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Joel Stanley <joel@....id.au>
Subject: Re: [PATCH v1] ARM: A9: Add ARM ERRATA 764319 workaround

Hi Arnd,

>    Hi Nick,

>    This seems a bit more complex than necessary. Can't you just use a custom
>    inline asm with an ex_table entry to catch the fault? Have a look at
>    __get_user_asm() for an example.
>
>           Arnd

We got inspired from debug_reg_hook within the same source file ( ./arch/arm/kernel/hw_breakpoint.c ). We chose that path to keep coherency within the source code. We can implement the same fix by using an ex_table entry, but this will create two different ways at catching unknown instruction within the same source file. Will that be ok ?

vejmarie