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From:   Ilya Leoshkevich <iii@linux.ibm.com>
To:     Alexander Gordeev <agordeev@linux.ibm.com>,
        Alexander Potapenko <glider@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Christoph Lameter <cl@linux.com>,
        David Rientjes <rientjes@google.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Marco Elver <elver@google.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Pekka Enberg <penberg@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Vlastimil Babka <vbabka@suse.cz>
Cc:     Christian Borntraeger <borntraeger@linux.ibm.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Hyeonggon Yoo <42.hyeyoo@gmail.com>,
        kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-s390@vger.kernel.org,
        linux-trace-kernel@vger.kernel.org,
        Mark Rutland <mark.rutland@arm.com>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Sven Schnelle <svens@linux.ibm.com>,
        Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH v3 25/34] s390/diag: Unpoison diag224() output buffer
Date:   Thu, 14 Dec 2023 00:24:45 +0100
Message-ID: <20231213233605.661251-26-iii@linux.ibm.com>
In-Reply-To: <20231213233605.661251-1-iii@linux.ibm.com>
References: <20231213233605.661251-1-iii@linux.ibm.com>
MIME-Version: 1.0
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Precedence: bulk

Diagnose 224 stores 4k bytes, which cannot be deduced from the inline
assembly constraints. This leads to KMSAN false positives.

Unpoison the output buffer manually with kmsan_unpoison_memory().

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 arch/s390/kernel/diag.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/kernel/diag.c b/arch/s390/kernel/diag.c
index 92fdc35f028c..fb83a21014d0 100644
--- a/arch/s390/kernel/diag.c
+++ b/arch/s390/kernel/diag.c
@@ -9,6 +9,7 @@
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/cpu.h>
+#include <linux/kmsan-checks.h>
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/vmalloc.h>
@@ -255,6 +256,7 @@ int diag224(void *ptr)
 		"1:\n"
 		EX_TABLE(0b,1b)
 		: "+d" (rc) :"d" (0), "d" (addr) : "memory");
+	kmsan_unpoison_memory(ptr, PAGE_SIZE);
 	return rc;
 }
 EXPORT_SYMBOL(diag224);
-- 
2.43.0