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Date: Tue, 9 Jul 2019 11:10:55 +0530
From: NitinGote <nitin.r.gote@...el.com>
To: akpm@...ux-foundation.org,
joe@...ches.com
Cc: corbet@....net,
apw@...onical.com,
keescook@...omium.org,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com,
Nitin Gote <nitin.r.gote@...el.com>
Subject: [PATCH v2] Added warnings in checkpatch.pl script to :
From: Nitin Gote <nitin.r.gote@...el.com>
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.
Acked-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Nitin Gote <nitin.r.gote@...el.com>
---
Change log:
v1->v2
- For string related apis, created different %deprecated_string_api
and these will get emitted at CHECK Level using command line option
-f/--file to avoid bad patched from novice script users.
This patch is already reviewed by mailing list
kernel-hardening@...ts.openwall.com. Refer below link
<https://www.openwall.com/lists/kernel-hardening/2019/07/03/4>
Acked-by: Kees Cook <keescook@...omium.org>
Documentation/process/deprecated.rst | 6 +++---
scripts/checkpatch.pl | 25 +++++++++++++++++++++++++
2 files changed, 28 insertions(+), 3 deletions(-)
diff --git a/Documentation/process/deprecated.rst b/Documentation/process/deprecated.rst
index 49e0f64a3427..f564de3caf76 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 bb28b178d929..10bd72e99dc8 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -605,6 +605,21 @@ foreach my $entry (keys %deprecated_apis) {
}
$deprecated_apis_search = "(?:${deprecated_apis_search})";
+our %deprecated_string_apis = (
+ "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 apis to speed up a loop below
+our $deprecated_string_apis_search = "";
+foreach my $entry (keys %deprecated_string_apis) {
+ $deprecated_string_apis_search .= '|' if ($deprecated_string_apis_search ne "");
+ $deprecated_string_apis_search .= $entry;
+}
+$deprecated_string_apis_search = "(?:${deprecated_string_apis_search})";
+
our $mode_perms_world_writable = qr{
S_IWUGO |
S_IWOTH |
@@ -6446,6 +6461,16 @@ sub process {
"Deprecated use of '$deprecated_api', prefer '$new_api' instead\n" . $herecurr);
}
+# check for string deprecated apis
+ if ($line =~ /\b($deprecated_string_apis_search)\b\s*\(/) {
+ my $deprecated_string_api = $1;
+ my $new_api = $deprecated_string_apis{$deprecated_string_api};
+ $check = 1;
+ CHK("DEPRECATED_API",
+ "Deprecated use of '$deprecated_string_api', prefer '$new_api' instead\n" . $herecurr);
+ $check = 0;
+ }
+
# check for various structs that are normally const (ops, kgdb, device_tree)
# and avoid what seem like struct definitions 'struct foo {'
if ($line !~ /\bconst\b/ &&
--
2.17.1
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