[v6,26/39] s390/cpacf: Unpoison the results of cpacf_trng()

Message ID	20240621002616.40684-27-iii@linux.ibm.com (mailing list archive)
State	New
Headers	show Return-Path: <owner-linux-mm@kvack.org> 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 v6 26/39] s390/cpacf: Unpoison the results of cpacf_trng() Date: Fri, 21 Jun 2024 02:25:00 +0200 Message-ID: <20240621002616.40684-27-iii@linux.ibm.com> In-Reply-To: <20240621002616.40684-1-iii@linux.ibm.com> References: <20240621002616.40684-1-iii@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	kmsan: Enable on s390 \| expand [v6,00/39] kmsan: Enable on s390 [v6,01/39] ftrace: Unpoison ftrace_regs in ftrace_ops_list_func() [v6,02/39] kmsan: Make the tests compatible with kmsan.panic=1 [v6,03/39] kmsan: Disable KMSAN when DEFERRED_STRUCT_PAGE_INIT is enabled [v6,04/39] kmsan: Increase the maximum store size to 4096 [v6,07/39] kmsan: Remove a useless assignment from kmsan_vmap_pages_range_noflush() [v6,08/39] kmsan: Remove an x86-specific #include from kmsan.h [v6,10/39] kmsan: Export panic_on_kmsan [v6,11/39] kmsan: Allow disabling KMSAN checks for the current task [v6,12/39] kmsan: Introduce memset_no_sanitize_memory() [v6,14/39] kmsan: Use ALIGN_DOWN() in kmsan_get_metadata() [v6,15/39] kmsan: Do not round up pg_data_t size [v6,17/39] mm: slub: Let KMSAN access metadata [v6,18/39] mm: slub: Disable KMSAN when checking the padding bytes [v6,19/39] mm: kfence: Disable KMSAN when checking the canary [v6,20/39] lib/zlib: Unpoison DFLTCC output buffers [v6,21/39] kmsan: Accept ranges starting with 0 on s390 [v6,22/39] s390/boot: Turn off KMSAN [v6,23/39] s390: Use a larger stack for KMSAN [v6,24/39] s390/boot: Add the KMSAN runtime stub [v6,25/39] s390/checksum: Add a KMSAN check [v6,26/39] s390/cpacf: Unpoison the results of cpacf_trng() [v6,27/39] s390/cpumf: Unpoison STCCTM output buffer [v6,28/39] s390/diag: Unpoison diag224() output buffer [v6,29/39] s390/ftrace: Unpoison ftrace_regs in kprobe_ftrace_handler() [v6,30/39] s390/irqflags: Do not instrument arch_local_irq_*() with KMSAN [v6,31/39] s390/mm: Define KMSAN metadata for vmalloc and modules [v6,32/39] s390/ptdump: Add KMSAN page markers [v6,33/39] s390/string: Add KMSAN support [v6,36/39] s390/uaccess: Add the missing linux/instrumented.h #include [v6,37/39] s390/unwind: Disable KMSAN checks [v6,38/39] s390/kmsan: Implement the architecture-specific functions [v6,39/39] kmsan: Enable on s390

Message ID

20240621002616.40684-27-iii@linux.ibm.com (mailing list archive)

State

New

Headers

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 v6 26/39] s390/cpacf: Unpoison the results of cpacf_trng()
Date: Fri, 21 Jun 2024 02:25:00 +0200
Message-ID: <20240621002616.40684-27-iii@linux.ibm.com>
In-Reply-To: <20240621002616.40684-1-iii@linux.ibm.com>
References: <20240621002616.40684-1-iii@linux.ibm.com>
MIME-Version: 1.0
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Sender: owner-linux-mm@kvack.org
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Series

kmsan: Enable on s390 | expand

Commit Message

Ilya Leoshkevich June 21, 2024, 12:25 a.m. UTC

Prevent KMSAN from complaining about buffers filled by cpacf_trng()
being uninitialized.

Tested-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 arch/s390/include/asm/cpacf.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h
index c786538e397c..dae8843b164f 100644
--- a/arch/s390/include/asm/cpacf.h
+++ b/arch/s390/include/asm/cpacf.h
@@ -12,6 +12,7 @@ 
 #define _ASM_S390_CPACF_H
 
 #include <asm/facility.h>
+#include <linux/kmsan-checks.h>
 
 /*
  * Instruction opcodes for the CPACF instructions
@@ -542,6 +543,8 @@  static inline void cpacf_trng(u8 *ucbuf, unsigned long ucbuf_len,
 		: [ucbuf] "+&d" (u.pair), [cbuf] "+&d" (c.pair)
 		: [fc] "K" (CPACF_PRNO_TRNG), [opc] "i" (CPACF_PRNO)
 		: "cc", "memory", "0");
+	kmsan_unpoison_memory(ucbuf, ucbuf_len);
+	kmsan_unpoison_memory(cbuf, cbuf_len);
 }
 
 /**

[v6,26/39] s390/cpacf: Unpoison the results of cpacf_trng()

Commit Message

Patch