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Date: Tue, 28 Feb 2017 16:06:07 -0800
From: Andrew Morton <>
To: Joe Perches <>
Cc: Andy Whitcroft <>, "Roberts, William C"
Subject: Re: [PATCH] checkpatch: Add ability to find bad uses of vsprintf
 %p<foo> extensions

On Mon, 27 Feb 2017 12:54:55 -0800 Joe Perches <> 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/ when adding new conversion characters.
+ * (search for "check for vsprintf extension").
+ *
  * Right now we handle:
  * - 'F' For symbolic function descriptor pointers with offset

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