linux-kernel - Re: [PATCH v4 18/26] arm64: vdso32: Replace TASK_SIZE

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Message-ID: <4eaa8717-78b4-0f28-6e14-9a0765e179c5@arm.com>
Date:   Tue, 17 Mar 2020 16:43:32 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-mips@...r.kernel.org, x86@...nel.org,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Paul Burton <paul.burton@...s.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Collingbourne <pcc@...gle.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Andrei Vagin <avagin@...nvz.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Mark Rutland <Mark.Rutland@....com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH v4 18/26] arm64: vdso32: Replace TASK_SIZE_32 check in
 vgettimeofday



On 3/17/20 4:40 PM, Vincenzo Frascino wrote:
> Hi Catalin,
> 
> On 3/17/20 3:50 PM, Catalin Marinas wrote:
>> On Tue, Mar 17, 2020 at 03:04:01PM +0000, Vincenzo Frascino wrote:
>>> On 3/17/20 2:38 PM, Catalin Marinas wrote:
>>>> On Tue, Mar 17, 2020 at 12:22:12PM +0000, Vincenzo Frascino wrote:
> 
> [...]
> 
>>>
>>> Can TASK_SIZE > UINTPTR_MAX on an arm64 system?
>>
>> TASK_SIZE yes on arm64 but not TASK_SIZE_32. I was asking about the
>> arm32 check where TASK_SIZE < UINTPTR_MAX. How does the vdsotest return
>> -EFAULT on arm32? Which code path causes this in the user vdso code?
>>
> 
> Sorry I got confused because you referred to arch/arm/vdso/vgettimeofday.c which
> is the arm64 implementation, not the compat one :)
> 

I stand corrected arch/*arm*/vdso/vgettimeofday.c is definitely the arm32
implemetation... I got completely confused here :)

-- 
Regards,
Vincenzo