linux-kernel - RE: [RFC PATCH 0/2] vfs:9p: fix open-unlink-fstat bug

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Message-ID: <HE1PR0802MB2555B33805E71BB78BBDACB3F47B0@HE1PR0802MB2555.eurprd08.prod.outlook.com>
Date:   Mon, 20 Jul 2020 01:58:15 +0000
From:   Jianyong Wu <Jianyong.Wu@....com>
To:     Al Viro <viro@...iv.linux.org.uk>
CC:     "ericvh@...il.com" <ericvh@...il.com>, "hch@....de" <hch@....de>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "lucho@...kov.net" <lucho@...kov.net>,
        "asmadeus@...ewreck.org" <asmadeus@...ewreck.org>,
        "v9fs-developer@...ts.sourceforge.net" 
        <v9fs-developer@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kaly Xin <Kaly.Xin@....com>, Justin He <Justin.He@....com>,
        Wei Chen <Wei.Chen@....com>
Subject: RE: [RFC PATCH 0/2] vfs:9p: fix open-unlink-fstat bug



> -----Original Message-----
> From: Al Viro <viro@....linux.org.uk> On Behalf Of Al Viro
> Sent: Monday, July 20, 2020 9:52 AM
> To: Jianyong Wu <Jianyong.Wu@....com>
> Cc: ericvh@...il.com; hch@....de; dhowells@...hat.com;
> lucho@...kov.net; asmadeus@...ewreck.org; v9fs-
> developer@...ts.sourceforge.net; linux-kernel@...r.kernel.org; Kaly Xin
> <Kaly.Xin@....com>; Justin He <Justin.He@....com>; Wei Chen
> <Wei.Chen@....com>
> Subject: Re: [RFC PATCH 0/2] vfs:9p: fix open-unlink-fstat bug
>
> On Mon, Jul 20, 2020 at 09:46:20AM +0800, Jianyong Wu wrote:
> > how to reproduce:
> > in 9p guest:
> >
> > struct stat *statbuf;
> > int fd;
> >
> > fd = open("tmp", O_RDWR);
> > unlink("tmp");
> > fstat(fd, statbuf);
> >
> > fstat will fail as "tmp" in 9p server side has been removed. 9p server
> > can't retrieve the file context as the guest has not passed it down.
> > so we should pass the file info down in 9p guest in getattr op.
> > it need add a new file member in "struct kstat" as "struct istat" does.
>
> Er... what struct istat?
Oh, sorry, I make mistake here. it's "struct iattr" Not "istat".

Thanks
Jianyong
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