linux-kernel - Re: [PATCH v7 18/43] instrumented.h: add KMSAN support

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Message-ID: <Y1Bt+Ia93mVV/lT3@elver.google.com>
Date:   Wed, 19 Oct 2022 23:36:56 +0200
From:   Marco Elver <elver@...gle.com>
To:     youling 257 <youling257@...il.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Biggers <ebiggers@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Kees Cook <keescook@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 18/43] instrumented.h: add KMSAN support

On Thu, Oct 20, 2022 at 04:07AM +0800, youling 257 wrote:
> That is i did,i already test, remove "u64 __tmp…kmsan_unpoison_memory", no help.
> i only remove kmsan_copy_to_user, fix my issue.

Ok - does only the below work (without the reverts)?

diff --git a/include/linux/kmsan-checks.h b/include/linux/kmsan-checks.h
index c4cae333deec..eb05caa8f523 100644
--- a/include/linux/kmsan-checks.h
+++ b/include/linux/kmsan-checks.h
@@ -73,8 +73,8 @@ static inline void kmsan_unpoison_memory(const void *address, size_t size)
 static inline void kmsan_check_memory(const void *address, size_t size)
 {
 }
-static inline void kmsan_copy_to_user(void __user *to, const void *from,
-				      size_t to_copy, size_t left)
+static __always_inline void kmsan_copy_to_user(void __user *to, const void *from,
+					       size_t to_copy, size_t left)
 {
 }
 

... because when you say only removing kmsan_copy_to_user() (from
instrument_put_user()) works, it really doesn't make any sense. The only
explanation would be if the compiler inlining is broken.