Re: [tip:x86/vdso] x86/vdso32/syscall.S: Do not load __USER32_DS to %ss
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- Subject: Re: [tip:x86/vdso] x86/vdso32/syscall.S: Do not load __USER32_DS to %ss
- From: Borislav Petkov <bp@xxxxxxxxx>
- Date: Thu, 23 Apr 2015 12:44:02 +0200
- Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Brian Gerst <brgerst@xxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Will Drewry <wad@xxxxxxxxxxxx>, Frédéric Weisbecker <fweisbec@xxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "linux-tip-commits@xxxxxxxxxxxxxxx" <linux-tip-commits@xxxxxxxxxxxxxxx>
- In-reply-to: <5538C8E3.60009@redhat.com>
- User-agent: Mutt/1.5.23 (2014-03-12)
On Thu, Apr 23, 2015 at 12:26:43PM +0200, Denys Vlasenko wrote:
> Yes. It loads *selector*. AMD docs say that selector is loaded as you say,
> but *cached descriptor* of SS (which is a different entity) is not modified.
>
> If *cached descriptor* is invalid, in 32-bit mode stack ops
> will fail. (In 64-bit mode, CPU doesn't do those checks).
So how can that happen with wine? Something's changing the cached
descriptor and only the write to %ss reloads it with the correct value?
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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