From: Joe Perches <joe@perches.com>
To: Nitin Gote <nitin.r.gote@intel.com>, akpm@linux-foundation.org
Cc: corbet@lwn.net, apw@canonical.com, keescook@chromium.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: [RFC PATCH] string.h: Add stracpy/stracpy_pad (was: Re: [PATCH] checkpatch: Added warnings in favor of strscpy().)
Date: Thu, 04 Jul 2019 17:15:57 -0700 [thread overview]
Message-ID: <d1524130f91d7cfd61bc736623409693d2895f57.camel@perches.com> (raw)
In-Reply-To: <f6a4c2b601bb59179cb2e3b8f4d836a1c11379a3.camel@perches.com>
On Thu, 2019-07-04 at 13:46 -0700, Joe Perches wrote:
> On Thu, 2019-07-04 at 11:24 +0530, Nitin Gote wrote:
> > Added warnings in checkpatch.pl script to :
> >
> > 1. Deprecate strcpy() in favor of strscpy().
> > 2. Deprecate strlcpy() in favor of strscpy().
> > 3. Deprecate strncpy() in favor of strscpy() or strscpy_pad().
> >
> > Updated strncpy() section in Documentation/process/deprecated.rst
> > to cover strscpy_pad() case.
[]
I sent a patch series for some strscpy/strlcpy misuses.
How about adding a macro helper to avoid the misuses like:
---
include/linux/string.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/linux/string.h b/include/linux/string.h
index 4deb11f7976b..ef01bd6f19df 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -35,6 +35,22 @@ ssize_t strscpy(char *, const char *, size_t);
/* Wraps calls to strscpy()/memset(), no arch specific code required */
ssize_t strscpy_pad(char *dest, const char *src, size_t count);
+#define stracpy(to, from) \
+({ \
+ size_t size = ARRAY_SIZE(to); \
+ BUILD_BUG_ON(!__same_type(typeof(*to), char)); \
+ \
+ strscpy(to, from, size); \
+})
+
+#define stracpy_pad(to, from) \
+({ \
+ size_t size = ARRAY_SIZE(to); \
+ BUILD_BUG_ON(!__same_type(typeof(*to), char)); \
+ \
+ strscpy_pad(to, from, size); \
+})
+
#ifndef __HAVE_ARCH_STRCAT
extern char * strcat(char *, const char *);
#endif
next prev parent reply other threads:[~2019-07-05 0:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-04 5:54 [PATCH] checkpatch: Added warnings in favor of strscpy() Nitin Gote
2019-07-04 20:46 ` Joe Perches
2019-07-05 0:15 ` Joe Perches [this message]
2019-07-22 17:33 ` [RFC PATCH] string.h: Add stracpy/stracpy_pad (was: Re: [PATCH] checkpatch: Added warnings in favor of strscpy().) Kees Cook
2019-07-22 17:43 ` Joe Perches
2019-07-22 17:58 ` Joe Perches
2019-07-22 18:21 ` Kees Cook
2019-07-22 18:27 ` Matthew Wilcox
2019-07-22 18:35 ` Joe Perches
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