netdev - Re: [PATCH v3 09/33] nds32: Cache and TLB routines

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: <CAEbi=3eKH5JESwtadq4LKF3ZvmBi1QwUWpCTb0btierBST_cRQ@mail.gmail.com>
Date:   Wed, 13 Dec 2017 16:30:41 +0800
From:   Greentime Hu <green.hu@...il.com>
To:     Guo Ren <ren_guo@...ky.com>
Cc:     Greentime <greentime@...estech.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arch <linux-arch@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Rob Herring <robh+dt@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        Vincent Chen <deanbo422@...il.com>,
        DTML <devicetree@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-serial@...r.kernel.org,
        Geert Uytterhoeven <geert.uytterhoeven@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>, Greg KH <greg@...ah.com>,
        Vincent Chen <vincentc@...estech.com>
Subject: Re: [PATCH v3 09/33] nds32: Cache and TLB routines

2017-12-13 16:19 GMT+08:00 Guo Ren <ren_guo@...ky.com>:
> On Wed, Dec 13, 2017 at 01:45:02PM +0800, Greentime Hu wrote:
>
>> I think it should be fine if an interruption between mtsr_dsb and
>> tlbop_rwr because this is a optimization by sw.
>
> Fine? When there is an unexpected vaddr in SR_TLB_VPN, tlbop_rwr(*pte) will
> break that vaddr's pfn in the CPU tlb-buffer entry. When linux access the
> vaddr, it will get wrong data unless the entry has been replaced out.

Hi, Guo Ren:

Thanks. I get your point.
It is needed to be protected.
I will fix it in the next version patch.

if (vma->vm_mm == current->active_mm) {
        local_irq_save(flags);
        __nds32__mtsr_dsb(addr, NDS32_SR_TLB_VPN);
        __nds32__tlbop_rwr(*pte);
        __nds32__isb();
        local_irq_restore(flags);
}