Messages in this thread | | | Date | Sun, 1 Oct 2023 08:43:41 +0200 | Subject | Re: [PATCH] comedi: Annotate struct comedi_lrange with __counted_by | From | "Gustavo A. R. Silva" <> |
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On 9/30/23 11:14, Christophe JAILLET wrote: > Prepare for the coming implementation by GCC and Clang of the __counted_by > attribute. Flexible array members annotated with __counted_by can have > their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS > (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions). > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Thanks -- Gustavo
> --- > This patch is part of a work done in parallel of what is currently worked > on by Kees Cook. > > My patches are only related to corner cases that do NOT match the > semantic of his Coccinelle script[1]. > > In this case, it is been spotted because of comedi_alloc_spriv(). > All other usages of struct comedi_lrange seem to be static definition of > the structure that explicitly set the .length field. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > --- > include/linux/comedi/comedidev.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/comedi/comedidev.h b/include/linux/comedi/comedidev.h > index 0a1150900ef3..c08416a7364b 100644 > --- a/include/linux/comedi/comedidev.h > +++ b/include/linux/comedi/comedidev.h > @@ -633,7 +633,7 @@ extern const struct comedi_lrange range_unknown; > */ > struct comedi_lrange { > int length; > - struct comedi_krange range[]; > + struct comedi_krange range[] __counted_by(length); > }; > > /**
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