linux-kernel - [PATCH] x86/vdso: Enable sanitizers for vma.o

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Message-Id: <20200106200204.94782-1-jannh@google.com>
Date:   Mon,  6 Jan 2020 21:02:04 +0100
From:   Jann Horn <jannh@...gle.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, jannh@...gle.com
Cc:     "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] x86/vdso: Enable sanitizers for vma.o

The vDSO makefile opts out of all sanitizers (and objtool validation);
however, vma.o is a normal kernel object file (and already has objtool
validation selectively enabled), so turn the sanitizers back on for that
file.

Signed-off-by: Jann Horn <jannh@...gle.com>
---

Notes:
    This should probably go on top of the locking/kcsan branch?

 arch/x86/entry/vdso/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
index 0f46273b4556..50a1c9008864 100644
--- a/arch/x86/entry/vdso/Makefile
+++ b/arch/x86/entry/vdso/Makefile
@@ -30,6 +30,9 @@ vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
 
 # files to link into kernel
 obj-y				+= vma.o
+KASAN_SANITIZE_vma.o		:= y
+UBSAN_SANITIZE_vma.o		:= y
+KCSAN_SANITIZE_vma.o		:= y
 OBJECT_FILES_NON_STANDARD_vma.o	:= n
 
 # vDSO images to build
-- 
2.24.1.735.g03f4e72817-goog