Re: [PATCH] checkpatch: Add ability to find bad uses of vsprintf %p<foo> extensions

[Andrew Morton]

On Mon, 27 Feb 2017 12:54:55 -0800 Joe Perches <joe@xxxxxxxxxxx> wrote:

> %pK was at least once misused at %pk in an out-of-tree module.
> This lead to some security concerns.  Add the ability to track
> single and multiple line statements for misuses of %p<foo>.

Should we also do this?

--- a/lib/vsprintf.c~checkpatch-add-ability-to-find-bad-uses-of-vsprintf-%pfoo-extensions-fix
+++ a/lib/vsprintf.c
@@ -1477,6 +1477,9 @@ int kptr_restrict __read_mostly;
  * by an extra set of alphanumeric characters that are extended format
  * specifiers.
  *
+ * Please update scripts/checkpatch.pl when adding new conversion characters.
+ * (search for "check for vsprintf extension").
+ *
  * Right now we handle:
  *
  * - 'F' For symbolic function descriptor pointers with offset
_