[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <1562134814-12966-1-git-send-email-nitin.r.gote@intel.com>
Date: Wed, 3 Jul 2019 11:50:14 +0530
From: Nitin Gote <nitin.r.gote@...el.com>
To: keescook@...omium.org
Cc: jannh@...gle.com,
kernel-hardening@...ts.openwall.com,
Nitin Gote <nitin.r.gote@...el.com>
Subject: [PATCH v2] checkpatch: Added warnings in favor of strscpy().
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.
Signed-off-by: Nitin Gote <nitin.r.gote@...el.com>
---
Documentation/process/deprecated.rst | 6 +++---
scripts/checkpatch.pl | 4 ++++
2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/Documentation/process/deprecated.rst b/Documentation/process/deprecated.rst
index 49e0f64..f564de3 100644
--- a/Documentation/process/deprecated.rst
+++ b/Documentation/process/deprecated.rst
@@ -93,9 +93,9 @@ will be NUL terminated. This can lead to various linear read overflows
and other misbehavior due to the missing termination. It also NUL-pads the
destination buffer if the source contents are shorter than the destination
buffer size, which may be a needless performance penalty for callers using
-only NUL-terminated strings. The safe replacement is :c:func:`strscpy`.
-(Users of :c:func:`strscpy` still needing NUL-padding will need an
-explicit :c:func:`memset` added.)
+only NUL-terminated strings. In this case, the safe replacement is
+:c:func:`strscpy`. If, however, the destination buffer still needs
+NUL-padding, the safe replacement is :c:func:`strscpy_pad`.
If a caller is using non-NUL-terminated strings, :c:func:`strncpy()` can
still be used, but destinations should be marked with the `__nonstring
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 342c7c7..2ce2340 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -595,6 +595,10 @@ our %deprecated_apis = (
"rcu_barrier_sched" => "rcu_barrier",
"get_state_synchronize_sched" => "get_state_synchronize_rcu",
"cond_synchronize_sched" => "cond_synchronize_rcu",
+ "strcpy" => "strscpy",
+ "strlcpy" => "strscpy",
+ "strncpy" => "strscpy, strscpy_pad or for non-NUL-terminated strings,
+ strncpy() can still be used, but destinations should be marked with the __nonstring",
);
#Create a search pattern for all these strings to speed up a loop below
--
2.7.4
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
