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From: Julia Lawall <julia.lawall@inria.fr>
To: Denis Efremov <efremov@linux.com>
Cc: cocci@systeme.lip6.fr, linux-kernel@vger.kernel.org,
	Kees Cook <keescook@chromium.org>
Subject: Re: [Cocci] [PATCH] coccinelle: misc: add array_size_dup script to detect missed overlow checks
Date: Wed, 17 Jun 2020 22:15:07 +0200 (CEST)
Message-ID: <alpine.DEB.2.22.394.2006172214360.3083@hadrien> (raw)
In-Reply-To: <alpine.DEB.2.22.394.2006172154040.3083@hadrien>



On Wed, 17 Jun 2020, Julia Lawall wrote:

>
>
> On Wed, 17 Jun 2020, Denis Efremov wrote:
>
> >
> > >
> > > Awesome! I'll take a look into this. :)
> > >
> > Here is another script for your #83 ticket.
> > Currently, it issues 598 warnings.
> >
> > // SPDX-License-Identifier: GPL-2.0-only
> > ///
> > /// Check for missing overflow checks in allocation functions.
> > /// Low confidence because it's pointless to check for overflow
> > /// relatively small allocations.
> > ///
> > // Confidence: Low
> > // Copyright: (C) 2020 Denis Efremov ISPRAS
> > // Options: --no-includes --include-headers
> >
> > virtual patch
> > virtual context
> > virtual org
> > virtual report
> >
> > @depends on patch@
> > expression E1, E2, E3, E4, size;
> > @@
> >
> > (
> > - size = E1 * E2;
> > + size = array_size(E1, E2);
> > |
> > - size = E1 * E2 * E3;
> > + size = array3_size(E1, E2, E3);
> > |
> > - size = E1 * E2 + E3;
> > + size = struct_size(E1, E2, E3);
>
> Should the arguments be checked to see if they have something to do with
> arrays and structures?

Sorry for the noise, I see that this comment makes no sense.

julia

>
> > )
> >   ... when != size = E4
> >       when != size += E4
> >       when != size -= E4
> >       when != size *= E4
>
> Here you can have a metavariable
>
> assignment operator aop;
>
> and then say size aop E4
>
> It doesn't really look like an assignment any more, but it could be a
> little safer.
>
> julia
>
> >       when != &size
> >   \(kmalloc\|krealloc\|kzalloc\|kzalloc_node\|
> >     vmalloc\|vzalloc\|vzalloc_node\|
> >     kvmalloc\|kvzalloc\|kvzalloc_node\|
> >     sock_kmalloc\|
> >     f2fs_kmalloc\|f2fs_kzalloc\|f2fs_kvmalloc\|f2fs_kvzalloc\|
> >     devm_kmalloc\|devm_kzalloc\)
> >   (..., size, ...)
> >
> > @r depends on !patch@
> > expression E1, E2, E3, E4, size;
> > position p;
> > @@
> >
> > (
> > * size = E1 * E2;@p
> > |
> > * size = E1 * E2 * E3;@p
> > |
> > * size = E1 * E2 + E3;@p
> > )
> >   ... when != size = E4
> >       when != size += E4
> >       when != size -= E4
> >       when != size *= E4
> >       when != &size
> > * \(kmalloc\|krealloc\|kzalloc\|kzalloc_node\|
> >     vmalloc\|vzalloc\|vzalloc_node\|
> >     kvmalloc\|kvzalloc\|kvzalloc_node\|
> >     sock_kmalloc\|
> >     f2fs_kmalloc\|f2fs_kzalloc\|f2fs_kvmalloc\|f2fs_kvzalloc\|
> >     devm_kmalloc\|devm_kzalloc\)
> >   (..., size, ...)
> >
> > @script:python depends on report@
> > p << r.p;
> > @@
> >
> > coccilib.report.print_report(p[0], "WARNING: missing overflow check")
> >
> > @script:python depends on org@
> > p << r.p;
> > @@
> >
> > coccilib.org.print_todo(p[0], "WARNING: missing overflow check")
> > _______________________________________________
> > Cocci mailing list
> > Cocci@systeme.lip6.fr
> > https://systeme.lip6.fr/mailman/listinfo/cocci
> >
> _______________________________________________
> Cocci mailing list
> Cocci@systeme.lip6.fr
> https://systeme.lip6.fr/mailman/listinfo/cocci
>
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  reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-15 10:20 Denis Efremov
2020-06-15 18:23 ` Kees Cook
2020-06-15 18:35   ` Denis Efremov
2020-06-15 18:46     ` Gustavo A. R. Silva
2020-06-17  9:32       ` Denis Efremov
2020-06-17 10:55       ` Denis Efremov
2020-06-17 20:08         ` Julia Lawall
2020-06-17 20:15           ` Julia Lawall [this message]
2020-06-17 18:15 ` Kees Cook
2020-06-17 18:54   ` Julia Lawall
2020-06-18 19:52     ` Kees Cook
2020-06-18 19:56       ` Julia Lawall
2020-06-18 20:48         ` Kees Cook
2020-06-18 21:08           ` Julia Lawall
2020-06-17 20:30 ` Julia Lawall
2020-06-17 20:50   ` Denis Efremov
2020-06-17 20:52     ` Julia Lawall
2020-06-18 10:23 ` [Cocci] [PATCH v2] " Denis Efremov
2020-06-19 13:13 ` [Cocci] [PATCH v3] coccinelle: misc: add array_size_dup script to detect missed overflow checks Denis Efremov
2020-06-21 20:53   ` Julia Lawall
2020-06-21 20:56   ` Julia Lawall
2020-06-22 12:12     ` Denis Efremov
2020-06-22 12:16     ` Denis Efremov
2020-06-22 12:19       ` Julia Lawall
2020-06-22 22:10 ` [Cocci] [PATCH v4] " Denis Efremov
2020-06-24 19:42   ` Julia Lawall

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