From: David Brown <david.brown@linaro.org>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: kernel-hardening@lists.openwall.com,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Kees Cook <keescook@chromium.org>
Subject: Re: [kernel-hardening] [PATCH] arm64: vdso: Mark vDSO code as read-only
Date: Fri, 12 Feb 2016 17:31:47 -0700 [thread overview]
Message-ID: <20160213003147.GA12074@davidb.org> (raw)
In-Reply-To: <CAKv+Gu8ArOYqxDGKb=Tv3NsiB2qWWCdD_zMx55m6+hEwLJR4CA@mail.gmail.com>
On Thu, Feb 11, 2016 at 03:19:20PM +0100, Ard Biesheuvel wrote:
>> diff --git a/arch/arm64/kernel/vdso/vdso.S b/arch/arm64/kernel/vdso/vdso.S
>> index 60c1db5..db7c0f2 100644
>> --- a/arch/arm64/kernel/vdso/vdso.S
>> +++ b/arch/arm64/kernel/vdso/vdso.S
>> @@ -24,6 +24,7 @@
>> __PAGE_ALIGNED_DATA
>
>^^ You can get rid of this now as well
Can we? The page is getting mapped to userspace, and if we didn't
page align it, we could leak kernel read-only data to every userspace
process.
David
WARNING: multiple messages have this Message-ID (diff)
From: david.brown@linaro.org (David Brown)
To: linux-arm-kernel@lists.infradead.org
Subject: [kernel-hardening] [PATCH] arm64: vdso: Mark vDSO code as read-only
Date: Fri, 12 Feb 2016 17:31:47 -0700 [thread overview]
Message-ID: <20160213003147.GA12074@davidb.org> (raw)
In-Reply-To: <CAKv+Gu8ArOYqxDGKb=Tv3NsiB2qWWCdD_zMx55m6+hEwLJR4CA@mail.gmail.com>
On Thu, Feb 11, 2016 at 03:19:20PM +0100, Ard Biesheuvel wrote:
>> diff --git a/arch/arm64/kernel/vdso/vdso.S b/arch/arm64/kernel/vdso/vdso.S
>> index 60c1db5..db7c0f2 100644
>> --- a/arch/arm64/kernel/vdso/vdso.S
>> +++ b/arch/arm64/kernel/vdso/vdso.S
>> @@ -24,6 +24,7 @@
>> __PAGE_ALIGNED_DATA
>
>^^ You can get rid of this now as well
Can we? The page is getting mapped to userspace, and if we didn't
page align it, we could leak kernel read-only data to every userspace
process.
David
next prev parent reply other threads:[~2016-02-13 0:31 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-10 21:52 [PATCH] arm64: vdso: Mark vDSO code as read-only David Brown
2016-02-10 21:52 ` [kernel-hardening] " David Brown
2016-02-10 21:52 ` David Brown
2016-02-11 13:47 ` Will Deacon
2016-02-11 13:47 ` [kernel-hardening] " Will Deacon
2016-02-11 13:47 ` Will Deacon
2016-02-11 14:19 ` [kernel-hardening] " Ard Biesheuvel
2016-02-11 14:19 ` Ard Biesheuvel
2016-02-11 14:19 ` Ard Biesheuvel
2016-02-13 0:31 ` David Brown [this message]
2016-02-13 0:31 ` David Brown
2016-02-13 0:31 ` David Brown
2016-02-13 9:00 ` Ard Biesheuvel
2016-02-13 9:00 ` Ard Biesheuvel
2016-02-13 9:00 ` Ard Biesheuvel
2016-02-16 18:22 ` Catalin Marinas
2016-02-16 18:22 ` [kernel-hardening] " Catalin Marinas
2016-02-16 18:22 ` Catalin Marinas
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