linux-kernel - [PATCH 4.9 09/62] kasan: turn on -fsanitize-address-use-after-scope

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Date:   Mon,  6 May 2019 16:32:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.9 09/62] kasan: turn on -fsanitize-address-use-after-scope

From: Andrey Ryabinin <aryabinin@...tuozzo.com>

commit c5caf21ab0cf884ef15b25af234f620e4a233139 upstream.

In the upcoming gcc7 release, the -fsanitize=kernel-address option at
first implied new -fsanitize-address-use-after-scope option.  This would
cause link errors on older kernels because they don't have two new
functions required for use-after-scope support.  Therefore, gcc7 changed
default to -fno-sanitize-address-use-after-scope.

Now the kernel has everything required for that feature since commit
828347f8f9a5 ("kasan: support use-after-scope detection").  So, to make it
work, we just have to enable use-after-scope in CFLAGS.

Link: http://lkml.kernel.org/r/1481207977-28654-1-git-send-email-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Acked-by: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 scripts/Makefile.kasan |    2 ++
 1 file changed, 2 insertions(+)

--- a/scripts/Makefile.kasan
+++ b/scripts/Makefile.kasan
@@ -29,6 +29,8 @@ else
     endif
 endif
 
+CFLAGS_KASAN += $(call cc-option, -fsanitize-address-use-after-scope)
+
 CFLAGS_KASAN_NOSANITIZE := -fno-builtin
 
 endif