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

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Date:   Thu, 18 Aug 2022 12:03:37 +0300
From:   Konstantin Shelekhin <k.shelekhin@...ro.com>
To:     Kees Cook <keescook@...omium.org>
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 Wed, Aug 17, 2022 at 12:36:33PM -0700, Kees Cook wrote:
> 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*

ARRAY_SIZE() (though not this one) can catch this:

  - char array[16];
  + char *array;

Saves me some.