From: Dave Hansen <dave.hansen@intel.com>
To: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
Robert Gill <rtgill82@gmail.com>,
Jari Ruusu <jariruusu@protonmail.com>,
Brian Gerst <brgerst@gmail.com>,
"Linux regression tracking (Thorsten Leemhuis)"
<regressions@leemhuis.info>,
antonio.gomez.iglesias@linux.intel.com,
daniel.sneddon@linux.intel.com
Subject: Re: [PATCH v6 2/3] x86/entry_32: Clear CPU buffers after register restore in NMI return
Date: Thu, 12 Sep 2024 10:39:13 -0700 [thread overview]
Message-ID: <d7c9d883-72d5-4258-8f36-be4268acf581@intel.com> (raw)
In-Reply-To: <20240905-fix-dosemu-vm86-v6-2-7aff8e53cbbf@linux.intel.com>
On 9/5/24 09:00, Pawan Gupta wrote:
> CPU buffers are currently cleared after call to exc_nmi, but before
> register state is restored. This may be okay for MDS mitigation but not for
> RDFS. Because RDFS mitigation requires CPU buffers to be cleared when
> registers don't have any sensitive data.
>
> Move CLEAR_CPU_BUFFERS after RESTORE_ALL_NMI.
This needs some grammar tweaking, but we can do that when it get applied.
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
next prev parent reply other threads:[~2024-09-12 17:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-05 16:00 [PATCH v6 0/3] Fix dosemu vm86() fault Pawan Gupta
2024-09-05 16:00 ` [PATCH v6 1/3] x86/entry_32: Do not clobber user EFLAGS.ZF Pawan Gupta
2024-09-12 17:45 ` Dave Hansen
2024-09-13 19:10 ` Pawan Gupta
2024-09-05 16:00 ` [PATCH v6 2/3] x86/entry_32: Clear CPU buffers after register restore in NMI return Pawan Gupta
2024-09-12 17:39 ` Dave Hansen [this message]
2024-09-05 16:00 ` [PATCH v6 3/3] x86/bugs: Use stack segment selector for VERW operand Pawan Gupta
2024-09-25 21:11 ` Pawan Gupta
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