linux-kernel - [PATCH 3/3] ubsan/overflow: Enable ignorelist parsing and add type filter

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Message-Id: <20250307041914.937329-3-kees@kernel.org>
Date: Thu,  6 Mar 2025 20:19:11 -0800
From: Kees Cook <kees@...nel.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Marco Elver <elver@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	kasan-dev@...glegroups.com,
	linux-hardening@...r.kernel.org,
	linux-kbuild@...r.kernel.org,
	Miguel Ojeda <ojeda@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Hao Luo <haoluo@...gle.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Bill Wendling <morbo@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Tony Ambardar <tony.ambardar@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Jan Hendrik Farr <kernel@...rr.cc>,
	Alexander Lobakin <aleksander.lobakin@...el.com>,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH 3/3] ubsan/overflow: Enable ignorelist parsing and add type filter

Limit integer wrap-around mitigation to only the "size_t" type (for
now). Notably this covers all special functions/builtins that return
"size_t", like sizeof(). This remains an experimental feature and is
likely to be replaced with type annotations.

Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: Justin Stitt <justinstitt@...gle.com>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Marco Elver <elver@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>
Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Masahiro Yamada <masahiroy@...nel.org>
Cc: Nathan Chancellor <nathan@...nel.org>
Cc: Nicolas Schier <nicolas@...sle.eu>
Cc: kasan-dev@...glegroups.com
Cc: linux-hardening@...r.kernel.org
Cc: linux-kbuild@...r.kernel.org
---
 lib/Kconfig.ubsan               | 1 +
 scripts/Makefile.ubsan          | 3 ++-
 scripts/integer-wrap-ignore.scl | 3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 scripts/integer-wrap-ignore.scl

diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 888c2e72c586..4216b3a4ff21 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -125,6 +125,7 @@ config UBSAN_INTEGER_WRAP
 	depends on $(cc-option,-fsanitize=unsigned-integer-overflow)
 	depends on $(cc-option,-fsanitize=implicit-signed-integer-truncation)
 	depends on $(cc-option,-fsanitize=implicit-unsigned-integer-truncation)
+	depends on $(cc-option,-fsanitize-ignorelist=/dev/null)
 	help
 	  This option enables all of the sanitizers involved in integer overflow
 	  (wrap-around) mitigation: signed-integer-overflow, unsigned-integer-overflow,
diff --git a/scripts/Makefile.ubsan b/scripts/Makefile.ubsan
index 233379c193a7..9e35198edbf0 100644
--- a/scripts/Makefile.ubsan
+++ b/scripts/Makefile.ubsan
@@ -19,5 +19,6 @@ ubsan-integer-wrap-cflags-$(CONFIG_UBSAN_INTEGER_WRAP)     +=	\
 	-fsanitize=signed-integer-overflow			\
 	-fsanitize=unsigned-integer-overflow			\
 	-fsanitize=implicit-signed-integer-truncation		\
-	-fsanitize=implicit-unsigned-integer-truncation
+	-fsanitize=implicit-unsigned-integer-truncation		\
+	-fsanitize-ignorelist=$(srctree)/scripts/integer-wrap-ignore.scl
 export CFLAGS_UBSAN_INTEGER_WRAP := $(ubsan-integer-wrap-cflags-y)
diff --git a/scripts/integer-wrap-ignore.scl b/scripts/integer-wrap-ignore.scl
new file mode 100644
index 000000000000..431c3053a4a2
--- /dev/null
+++ b/scripts/integer-wrap-ignore.scl
@@ -0,0 +1,3 @@
+[{unsigned-integer-overflow,signed-integer-overflow,implicit-signed-integer-truncation,implicit-unsigned-integer-truncation}]
+type:*
+type:size_t=sanitize
-- 
2.34.1