linux-kernel - Re: [PATCH v9 01/27] kallsyms: use `sizeof` instead of hardcoded size

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Date:   Wed, 17 Aug 2022 12:36:33 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Konstantin Shelekhin <k.shelekhin@...ro.com>
Cc:     ojeda@...nel.org, boqun.feng@...il.com, gregkh@...uxfoundation.org,
        jarkko@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        rust-for-linux@...r.kernel.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH v9 01/27] kallsyms: use `sizeof` instead of hardcoded size

On Sat, Aug 06, 2022 at 01:40:33AM +0300, Konstantin Shelekhin wrote:
> > diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
> > index f18e6dfc68c5..52f5488c61bc 100644
> > --- a/scripts/kallsyms.c
> > +++ b/scripts/kallsyms.c
> > @@ -206,7 +206,7 @@ static struct sym_entry *read_symbol(FILE *in)
> >  
> >  	rc = fscanf(in, "%llx %c %499s\n", &addr, &type, name);
> >  	if (rc != 3) {
> > -		if (rc != EOF && fgets(name, 500, in) == NULL)
> > +		if (rc != EOF && fgets(name, sizeof(name), in) == NULL)
> >  			fprintf(stderr, "Read error or end of file.\n");
> >  		return NULL;
> >  	}
> 
> Might be another nit, but IMO it's better to use ARRAY_SIZE() here.

I'm not sure I see a benefit for char arrays. It'll produce the same
result, and the tradition for string functions is to use sizeof().
*shrug*

Either way:

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook