linux-hardening - Re: [PATCH] comedi: Annotate struct comedi_lrange with __counted

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Date: Sun, 1 Oct 2023 21:14:02 +0200 (CEST)
From: Julia Lawall <julia.lawall@...ia.fr>
To: Kees Cook <kees@...nel.org>
cc: Julia Lawall <julia.lawall@...ia.fr>, Kees Cook <keescook@...omium.org>, 
    Christophe JAILLET <christophe.jaillet@...adoo.fr>, 
    Ian Abbott <abbotti@....co.uk>, 
    H Hartley Sweeten <hsweeten@...ionengravers.com>, 
    "Gustavo A. R. Silva" <gustavoars@...nel.org>, 
    Nathan Chancellor <nathan@...nel.org>, 
    Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, 
    linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org, 
    linux-hardening@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] comedi: Annotate struct comedi_lrange with
 __counted_by

Kees,

You can try the following.

julia

#spatch --all-includes

@r@
identifier i,j;
type T;
@@

struct i {
  ...
  T j[];
}

@s@
identifier r.i;
constant ini;
identifier j;
initializer list [n] is2;
position p;
identifier x;
@@

struct i@p x =
 { ...,
   .j = ini,
   ...,
   { is2 } }
  ;

@script:ocaml@
ini << s.ini;
i << r.i;
j << s.j;
n << s.n;
p << s.p;
@@

try
  let ini = int_of_string ini in
  if n = ini
  then Printf.printf "%s:%d: struct %s: field %s is the counter for the flex array\n" (List.hd p).file (List.hd p).line i j
with _-> () (* not an explicit integer *)

@s2@
identifier r.i;
constant ini;
initializer list [n] is;
initializer list [n2] is2;
position p;
identifier x;
@@

struct i@p x =
  { is,
    ini,
    ...,
    { is2 } };

@script:ocaml@
ini << s2.ini;
i << r.i;
n << s2.n;
n2 << s2.n2;
p << s2.p;
@@

try
  let ini = int_of_string ini in
  if n2 = ini
  then Printf.printf "%s:%d: struct %s: field at offset %d is the counter for the flex array\n" (List.hd p).file (List.hd p).line i n
with _-> () (* not an explicit integer *)