linux-kernel - Re: [Fwd: [PATCH 1/2] string: Add stracpy and stracpy

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Message-ID: <alpine.DEB.2.21.1907232326360.2539@hadrien>
Date:   Tue, 23 Jul 2019 23:27:17 -0500 (CDT)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Joe Perches <joe@...ches.com>
cc:     cocci <cocci@...teme.lip6.fr>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Fwd: [PATCH 1/2] string: Add stracpy and stracpy_pad
 mechanisms]



On Tue, 23 Jul 2019, Joe Perches wrote:

> On Tue, 2019-07-23 at 22:54 -0500, Julia Lawall wrote:
> > A seantic patch and the resulting output for the case where the third
> > arugument is a constant is attached.  Likewise the resulting output on a
> > recent linux-next.
> >
> > julia
>
> Nice.  Thanks Julia
>
> A couple issues:
>
> There is a problem with conversions with assignments
> of strlcpy() so ideally the cocci script should make sure
> any return value was not used before conversion.
>
> This is not a provably good conversion:
>
> drivers/s390/char/sclp_ftp.c
> @@ -114,8 +114,7 @@ static int sclp_ftp_et7(const struct hmc
>         sccb->evbuf.mdd.ftp.length = ftp->len;
>         sccb->evbuf.mdd.ftp.bufaddr = virt_to_phys(ftp->buf);
>
> -       len = strlcpy(sccb->evbuf.mdd.ftp.fident, ftp->fname,
> -                     HMCDRV_FTP_FIDENT_MAX);
> +       len = stracpy(sccb->evbuf.mdd.ftp.fident, ftp->fname);

Sorry, I don't understand the issue here.  What specifically should I be
looking for?

>
> And:
>
> I would have expected the bit below to find and convert uses like
> 	drivers/hwmon/adc128d818.c:     strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
> but it seems none of those were converted.

OK, thanks.  I will check on it.

julia

> I don't know why.
>
> //------------------------------------------
> @r1@
> struct i1 *e1;
> expression e2;
> identifier f,i1,i2;
> position p;
> @@
> \(strscpy\|strlcpy\)(e1->f, e2, i2)@p
>
> @@
> identifier r1.i1,r1.i2;
> type T;
> @@
> struct i1 { ... T i1[i2]; ... }
>
> @@
> identifier f,i2;
> expression e1,e2;
> position r1.p;
> @@
> (
> -strscpy
> +stracpy
> |
> -strlcpy
> +stracpy
> )(e1->f, e2
> -    , i2
>   )@p
> //------------------------------------------
>
> to find
>
>