[24/32] s390/cpacf: Unpoison the results of cpacf_trng()

Message ID	20231115203401.2495875-25-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>, 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 24/32] s390/cpacf: Unpoison the results of cpacf_trng() Date: Wed, 15 Nov 2023 21:30:56 +0100 Message-ID: <20231115203401.2495875-25-iii@linux.ibm.com> In-Reply-To: <20231115203401.2495875-1-iii@linux.ibm.com> References: <20231115203401.2495875-1-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 [00/32] kmsan: Enable on s390 [01/32] ftrace: Unpoison ftrace_regs in ftrace_ops_list_func() [02/32] kmsan: Make the tests compatible with kmsan.panic=1 [04/32] kmsan: Increase the maximum store size to 4096 [05/32] kmsan: Fix is_bad_asm_addr() on arches with overlapping address spaces [06/32] kmsan: Fix kmsan_copy_to_user() on arches with overlapping address spaces [08/32] kmsan: Remove an x86-specific #include from kmsan.h [10/32] kmsan: Expose kmsan_get_metadata() [11/32] kmsan: Export panic_on_kmsan [12/32] kmsan: Allow disabling KMSAN checks for the current task [13/32] kmsan: Support SLAB_POISON [15/32] mm: slub: Let KMSAN access metadata [16/32] mm: kfence: Disable KMSAN when checking the canary [17/32] lib/string: Add KMSAN support to strlcpy() and strlcat() [18/32] lib/zlib: Unpoison DFLTCC output buffers [19/32] kmsan: Accept ranges starting with 0 on s390 [20/32] s390: Turn off KMSAN for boot, vdso and purgatory [21/32] s390: Use a larger stack for KMSAN [22/32] s390/boot: Add the KMSAN runtime stub [23/32] s390/checksum: Add a KMSAN check [24/32] s390/cpacf: Unpoison the results of cpacf_trng() [26/32] s390/mm: Define KMSAN metadata for vmalloc and modules [27/32] s390/string: Add KMSAN support [28/32] s390/traps: Unpoison the kernel_stack_overflow()'s pt_regs [30/32] s390/unwind: Disable KMSAN checks [31/32] s390: Implement the architecture-specific kmsan functions [32/32] kmsan: Enable on s390

Message ID

20231115203401.2495875-25-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>,
        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 24/32] s390/cpacf: Unpoison the results of cpacf_trng()
Date: Wed, 15 Nov 2023 21:30:56 +0100
Message-ID: <20231115203401.2495875-25-iii@linux.ibm.com>
In-Reply-To: <20231115203401.2495875-1-iii@linux.ibm.com>
References: <20231115203401.2495875-1-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

Commit Message

Ilya Leoshkevich Nov. 15, 2023, 8:30 p.m. UTC

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

Tested-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 arch/s390/include/asm/cpacf.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h
index b378e2b57ad8..a72b92770c4b 100644
--- a/arch/s390/include/asm/cpacf.h
+++ b/arch/s390/include/asm/cpacf.h
@@ -473,6 +473,8 @@  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);
 }
 
 /**

[24/32] s390/cpacf: Unpoison the results of cpacf_trng()

Commit Message

Patch