linux-kernel - RE: [PATCH 2/2] lib/test_printf: add test of null/invalid pointer dereference for dentry

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Message-ID: <DB7PR08MB3082AEAE86FD463713FA4825F7AF0@DB7PR08MB3082.eurprd08.prod.outlook.com>
Date:   Fri, 16 Aug 2019 08:31:57 +0000
From:   "Justin He (Arm Technology China)" <Justin.He@....com>
To:     Petr Mladek <pmladek@...e.com>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Shuah Khan <shuah@...nel.org>,
        "Tobin C. Harding" <tobin@...nel.org>
Subject: RE: [PATCH 2/2] lib/test_printf: add test of null/invalid pointer
 dereference for dentry

Hi Petr

> -----Original Message-----
> From: Petr Mladek <pmladek@...e.com>
> Sent: 2019年8月16日 16:27
> To: Justin He (Arm Technology China) <Justin.He@....com>
> Cc: Geert Uytterhoeven <geert+renesas@...der.be>; Sergey Senozhatsky
> <sergey.senozhatsky@...il.com>; Thomas Gleixner <tglx@...utronix.de>;
> Andy Shevchenko <andriy.shevchenko@...ux.intel.com>; linux-
> kernel@...r.kernel.org; Kees Cook <keescook@...omium.org>; Steven
> Rostedt (VMware) <rostedt@...dmis.org>; Shuah Khan
> <shuah@...nel.org>; Tobin C. Harding <tobin@...nel.org>
> Subject: Re: [PATCH 2/2] lib/test_printf: add test of null/invalid pointer
> dereference for dentry
>
> On Fri 2019-08-09 09:24:57, Jia He wrote:
> > This add some additional test cases of null/invalid pointer dereference
> > for dentry and file (%pd and %pD)
> >
> > Signed-off-by: Jia He <justin.he@....com>
> > ---
> >  lib/test_printf.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/lib/test_printf.c b/lib/test_printf.c
> > index 944eb50f3862..befedffeb476 100644
> > --- a/lib/test_printf.c
> > +++ b/lib/test_printf.c
> > @@ -455,6 +455,13 @@ dentry(void)
> >     test("foo", "%pd", &test_dentry[0]);
> >     test("foo", "%pd2", &test_dentry[0]);
> >
> > +   /* test the null/invalid pointer case for dentry */
> > +   test("(null)", "%pd", NULL);
> > +   test("(efault)", "%pd", PTR_INVALID);
> > +   /* test the null/invalid pointer case for file */
>
> The two comments mention something that is obvious from the code.
>
No problem, ok with me 😊


--
Cheers,
Justin (Jia He)


> I have pushed the patch as is and removed the comments in
> a follow up patch [1]. Both are in printk.git, branch for-5.4.
>
> > +   test("(null)", "%pD", NULL);
> > +   test("(efault)", "%pD", PTR_INVALID);
>
> Reference:
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk.git/commi
> t/?h=for-5.4&id=8ebea6ea1a7ed5d67ecbb2a493c716a2a89c0be2
>
> Best Regards,
> Petr
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