From: Thomas Gleixner <tglx@linutronix.de>
To: Mathias Krause <minipli@googlemail.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@amacapital.net>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Roland McGrath <roland@redhat.com>
Subject: Re: [PATCH] x86/vdso: ensure vdso32_enabled gets set to valid values only
Date: Mon, 10 Apr 2017 15:13:59 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.20.1704101500280.2906@nanos> (raw)
In-Reply-To: <1491424561-7187-1-git-send-email-minipli@googlemail.com>
On Wed, 5 Apr 2017, Mathias Krause wrote:
> @@ -62,13 +64,18 @@ int __init sysenter_setup(void)
> /* Register vsyscall32 into the ABI table */
> #include <linux/sysctl.h>
>
> +static const int zero;
> +static const int one = 1;
> +
> static struct ctl_table abi_table2[] = {
> {
> .procname = "vsyscall32",
> .data = &vdso32_enabled,
> .maxlen = sizeof(int),
> .mode = 0644,
> - .proc_handler = proc_dointvec
> + .proc_handler = proc_dointvec_minmax,
> + .extra1 = (int *)&zero,
> + .extra2 = (int *)&one,
This is still bustable. Let's start with: vdso32_enabled = false
arch_setup_additional_pages()
--> No mapping
sysctl.vsysscall32()
--> vdso32_enabled = true
create_elf_tables()
if (vdso32_enabled) {
--> Add VDSO entry with NULL pointer
The vdso map code needs to store a flag in current which can be checked in
ARCH_DLINFO_IA32.
Thanks,
tglx
next prev parent reply other threads:[~2017-04-10 13:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-05 20:36 [PATCH] x86/vdso: ensure vdso32_enabled gets set to valid values only Mathias Krause
2017-04-06 15:59 ` Andy Lutomirski
2017-04-10 13:13 ` Thomas Gleixner [this message]
2017-04-10 13:41 ` Thomas Gleixner
2017-04-10 15:14 [patch 0/3] x86/vdso: Fix enable inconsistencies and cleanup Thomas Gleixner
2017-04-10 15:14 ` [patch 1/3] x86/vdso: Ensure vdso32_enabled gets set to valid values only Thomas Gleixner
2017-04-10 16:34 ` [tip:x86/urgent] " tip-bot for Mathias Krause
2017-04-10 15:14 ` [patch 2/3] x86/vdso: Plug race between mapping and ELF header setup Thomas Gleixner
2017-04-10 15:56 ` Andy Lutomirski
2017-04-10 16:34 ` [tip:x86/urgent] " tip-bot for Thomas Gleixner
2017-04-10 15:14 ` [patch 3/3] x86/vdso: Sanitize vdso*_enabled handling Thomas Gleixner
2017-04-10 15:55 ` Andy Lutomirski
2017-04-10 16:25 ` Thomas Gleixner
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