linux-kernel - Re: [syzbot] [virtualization?] KMSAN: uninit-value in virtqueue

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Message-ID: <be634ab4-58aa-40e4-8ab0-0e2685537525@I-love.SAKURA.ne.jp>
Date: Sat, 24 Feb 2024 14:53:16 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: syzbot <syzbot+d7521c1e3841ed075a42@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com
Cc: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [virtualization?] KMSAN: uninit-value in virtqueue_add
 (4)

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/arch/x86/include/asm/page_64.h b/arch/x86/include/asm/page_64.h
index cc6b8e087192..f13bba3a9dab 100644
--- a/arch/x86/include/asm/page_64.h
+++ b/arch/x86/include/asm/page_64.h
@@ -58,7 +58,16 @@ static inline void clear_page(void *page)
 			   : "cc", "memory", "rax", "rcx");
 }
 
+#ifdef CONFIG_KMSAN
+/* Use of non-instrumented assembly version confuses KMSAN. */
+void *memcpy(void *to, const void *from, __kernel_size_t len);
+static inline void copy_page(void *to, void *from)
+{
+	memcpy(to, from, PAGE_SIZE);
+}
+#else
 void copy_page(void *to, void *from);
+#endif
 
 #ifdef CONFIG_X86_5LEVEL
 /*
-- 
2.34.1