Message-ID: <AM6PR08MB437615DB6A6DEC33223A3138F7229@AM6PR08MB4376.eurprd08.prod.outlook.com>
Date:   Fri, 28 May 2021 15:09:28 +0000
From:   Justin He <Justin.He@....com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Luca Coelho <luciano.coelho@...el.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Johannes Berg <johannes.berg@...el.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>
Subject: RE: [PATCH RFCv2 2/3] lib/vsprintf.c: make %pD print full path for
 file

Hi Matthew

> -----Original Message-----
> From: Matthew Wilcox <willy@...radead.org>
> Sent: Friday, May 28, 2021 10:53 PM
> To: Justin He <Justin.He@....com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>; Petr Mladek
> <pmladek@...e.com>; Steven Rostedt <rostedt@...dmis.org>; Sergey
> Senozhatsky <senozhatsky@...omium.org>; Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com>; Rasmus Villemoes
> <linux@...musvillemoes.dk>; Jonathan Corbet <corbet@....net>; Alexander
> Viro <viro@...iv.linux.org.uk>; Luca Coelho <luciano.coelho@...el.com>;
> Kalle Valo <kvalo@...eaurora.org>; David S. Miller <davem@...emloft.net>;
> Jakub Kicinski <kuba@...nel.org>; Heiko Carstens <hca@...ux.ibm.com>;
> Vasily Gorbik <gor@...ux.ibm.com>; Christian Borntraeger
> <borntraeger@...ibm.com>; Johannes Berg <johannes.berg@...el.com>; linux-
> doc@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> wireless@...r.kernel.org; netdev@...r.kernel.org; linux-
> s390@...r.kernel.org
> Subject: Re: [PATCH RFCv2 2/3] lib/vsprintf.c: make %pD print full path
> for file
>
> On Fri, May 28, 2021 at 02:22:01PM +0000, Justin He wrote:
> > > On Fri, May 28, 2021 at 07:39:50PM +0800, Jia He wrote:
> > > > We have '%pD' for printing a filename. It may not be perfect (by
> > > > default it only prints one component.)
> > > >
> > > > As suggested by Linus at [1]:
> > > > A dentry has a parent, but at the same time, a dentry really does
> > > > inherently have "one name" (and given just the dentry pointers, you
> > > > can't show mount-related parenthood, so in many ways the "show just
> > > > one name" makes sense for "%pd" in ways it doesn't necessarily for
> > > > "%pD"). But while a dentry arguably has that "one primary component",
> > > > a _file_ is certainly not exclusively about that last component.
> > > >
> > > > Hence "file_dentry_name()" simply shouldn't use "dentry_name()" at
> all.
> > > > Despite that shared code origin, and despite that similar letter
> > > > choice (lower-vs-upper case), a dentry and a file really are very
> > > > different from a name standpoint.
> > > >
> > > > Here stack space is preferred for file_d_path_name() because it is
> > > > much safer. The stack size 256 is a compromise between stack
> overflow
> > > > and too short full path.
> > >
> > > How is it "safer"?  You already have a buffer passed from the caller.
> > > Are you saying that d_path_fast() might overrun a really small buffer
> > > but won't overrun a 256 byte buffer?
> > No, it won't overrun a 256 byte buf. When the full path size is larger
> than 256, the p->len is < 0 in prepend_name, and this overrun will be
> > dectected in extract_string() with "-ENAMETOOLONG".
> >
> > Each printk contains 2 vsnprintf. vsnprintf() returns the required size
> after formatting the string.
> > 1. vprintk_store() will invoke 1st vsnprintf() will 8 bytes space to get
> the reserve_size. In this case, the _buf_ could be less than _end_ by
> design.
> > 2. Then it invokes 2nd printk_sprint()->vscnprintf()->vsnprintf() to
> really fill the space.
>
> I think you need to explain _that_ in the commit log, not make some
> nebulous claim of "safer".

Okay

>
> > If we choose the stack space, it can meet above 2 cases.
> >
> > If we pass the parameter like:
> > p = d_path_fast(path, buf, end - buf);
> > We need to handle the complicated logic in prepend_name()
> > I have tried this way in local test, the code logic is very complicated
> > and not so graceful.
> > e.g. I need to firstly go through the loop and get the full path size of
> > that file. And then return reserved_size for that 1st vsnprintf
>
> I'm not sure why it's so complicated.  p->len records how many bytes
> are needed for the entire path; can't you just return -p->len ?

prepend_name() will return at the beginning if p->len is <0 in this case,
we can't even get the correct full path size if keep __prepend_path unchanged.
We need another new helper __prepend_path_size() to get the full path size
regardless of the negative value p->len.

More than that, even the 1st vsnprintf could have _end_ > _buf_ in some case:
What if printk("%pD", filp) ? The 1st vsnprintf has positive (end-buf).

This make things more complicated.

Hope I have described it clearly as above.

--
Cheers,
Justin (Jia He)


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