linux-kernel - Re: test_syscall_vdso

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Date:   Tue, 26 Jun 2018 22:13:26 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     zhijianx.li@...el.com, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Andrew Lutomirski <luto@...nel.org>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        "Li, Philip" <philip.li@...el.com>,
        kernel test robot <xiaolong.ye@...el.com>
Subject: Re: test_syscall_vdso_32 [FAIL]

On Mon, Jun 25, 2018 at 6:23 PM Li Zhijian <zhijianx.li@...el.com> wrote:
>
> On 6/25/2018 11:40 PM, Andy Lutomirski wrote:
> > On Mon, Jun 25, 2018 at 1:41 AM Li Zhijian <zhijianx.li@...el.com> wrote:
> >> Hi
> >>
> >> Intel 0Day noticed that test_syscall_vdso_32 failed since 8bb2610bc4967f19672444a7b0407367f1540028(x86/entry/64/compat: Preserve r8-r11 in int $0x80)
> >>

[snipped]

Indeed.

Hi Thomas-

Something went wrong when you applied the patch mentioned above.  The
original patch is here:

https://lore.kernel.org/lkml/d4c4d9985fbe64f8c9e19291886453914b48caee.1523975710.git.luto@kernel.org/

but somehow it got applied with huge offset -- the same exact change
was made, but it was made to the entirely wrong function!  I'm a
little nervous about sending a fixup patch because there are three
copies of that code in the file, and I don't want to just move the
problem around.  What's the right thing to do here?

Clearly this needs to get fixed somehow, and the fix should go to -stable.

--Andy