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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
	Paul Burton <paulburton@kernel.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Christian Brauner <christian.brauner@canonical.com>
Subject: Re: [PATCH] mips: vdso: conditionalize 32-bit time functions on COMPAT_32BIT_TIME
Date: Mon, 30 Dec 2019 13:26:49 +0100	[thread overview]
Message-ID: <CAHmME9o07dQV_MmWmtBFCKp=sdsO-scC6-UbXNi=dpU6umCoPg@mail.gmail.com> (raw)
In-Reply-To: <CAK8P3a1fVFDkHe=gLy55rHxwfZ8YKcUSYvnhSoMbcAgWy6Nm9w@mail.gmail.com>

On Mon, Dec 30, 2019 at 12:58 PM Arnd Bergmann <arnd@arndb.de> wrote:
> Thanks for the bug report! I'm not completely sure why this fails in
> this particular
> way though. I assume you are using musl-1.1.20, not a musl-1.2.0 snapshot

Yes, that's the one, sorry.

> diff --git a/arch/mips/vdso/vdso.lds.S b/arch/mips/vdso/vdso.lds.S
> index da4627430aba..0bdc6a026be8 100644
> --- a/arch/mips/vdso/vdso.lds.S
> +++ b/arch/mips/vdso/vdso.lds.S
> @@ -93,9 +93,11 @@ VERSION
>         LINUX_2.6 {
>  #ifndef DISABLE_MIPS_VDSO
>         global:
> +#if (_MIPS_SIM == _MIPS_SIM_ABI64) || defined(CONFIG_COMPAT_32BIT_TIME)
>                 __vdso_clock_gettime;
>                 __vdso_gettimeofday;
>                 __vdso_clock_getres;
> +#endif
>  #if _MIPS_SIM != _MIPS_SIM_ABI64
>                 __vdso_clock_gettime64;
>  #endif
>
> That should ensure that no user space can call the old vdso
> functions on a kernel that intentionally breaks the actual
> syscalls.

I can confirm that patch fixes things. Thanks.

Jason

  reply	other threads:[~2019-12-30 12:27 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-23 13:08 vdso-related userspace crashes on 5.5 mips64 Jason A. Donenfeld
2019-12-23 21:44 ` Jason A. Donenfeld
2019-12-23 23:29 ` Paul Burton
2019-12-24 13:37   ` Jason A. Donenfeld
2019-12-30 15:58     ` Arnd Bergmann
2019-12-24 14:19   ` Jason A. Donenfeld
2019-12-24 13:54 ` [PATCH] mips: vdso: conditionalize 32-bit time functions on COMPAT_32BIT_TIME Jason A. Donenfeld
2019-12-30 11:57   ` Arnd Bergmann
2019-12-30 12:26     ` Jason A. Donenfeld [this message]
2019-12-30 12:34       ` Arnd Bergmann
2019-12-30 14:37         ` Jason A. Donenfeld
2019-12-30 15:10           ` Jason A. Donenfeld
2019-12-30 15:37           ` Arnd Bergmann
2019-12-30 15:39             ` Jason A. Donenfeld
2019-12-30 15:47               ` Arnd Bergmann
2019-12-30 15:58                 ` Jason A. Donenfeld
2019-12-30 17:33                   ` Arnd Bergmann
2019-12-30 21:09                     ` Jason A. Donenfeld
2019-12-30 21:42                       ` Jason A. Donenfeld
2019-12-31 16:14                         ` Jason A. Donenfeld
2020-01-01  4:10                           ` Paul Burton
2020-01-01  4:25                             ` Paul Burton
2020-01-01  9:47                               ` Jason A. Donenfeld
2020-01-01  9:47                             ` Jason A. Donenfeld

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