linux-kernel - 答复: [PATCH][v4] virt: tdx-guest: Don't free decrypted memory

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Message-ID: <517c39d0ded1475fbdf6d648542f023e@baidu.com>
Date: Wed, 27 Nov 2024 06:25:08 +0000
From: "Li,Rongqing" <lirongqing@...du.com>
To: "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "x86@...nel.org"
	<x86@...nel.org>, "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rick.p.edgecombe@...el.com" <rick.p.edgecombe@...el.com>
Subject: 答复: [PATCH][v4] virt: tdx-guest: Don't free decrypted memory


> > In CoCo VMs it is possible for the untrusted host to cause
> > set_memory_decrypted() to fail such that an error is returned and the
> > resulting memory is shared. Callers need to take care to handle these
> > errors to avoid returning decrypted (shared) memory to the page
> > allocator, which could lead to functional or security issues.
> >
> > Leak the decrypted memory when set_memory_decrypted() fails, and don't
> > need to print an error since set_memory_decrypted() will call WARN_ONCE().
> >
> > Reviewed-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> > Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> > Signed-off-by: Li RongQing <lirongqing@...du.com>
> > ---
> 
> 
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