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(haven.au.ibm.com [9.192.254.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.au.ibm.com (Postfix) with ESMTPSA id 77E0D605F3; Thu, 14 Dec 2023 16:56:19 +1100 (AEDT) From: Nicholas Miehlbradt To: glider@google.com, elver@google.com, dvyukov@google.com, akpm@linux-foundation.org, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu Cc: linux-mm@kvack.org, kasan-dev@googlegroups.com, iii@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Nicholas Miehlbradt Subject: [PATCH 05/13] powerpc: Unpoison buffers populated by hcalls Date: Thu, 14 Dec 2023 05:55:31 +0000 Message-Id: <20231214055539.9420-6-nicholas@linux.ibm.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231214055539.9420-1-nicholas@linux.ibm.com> References: <20231214055539.9420-1-nicholas@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: oohPGHWoNwWW22yXQxLqPk3YupwgWY9n X-Proofpoint-GUID: v3dSSLQcrbP9Wpukc5CGgwUiAQvQLOIY X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-14_02,2023-12-13_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 suspectscore=0 mlxlogscore=695 malwarescore=0 clxscore=1015 priorityscore=1501 impostorscore=0 spamscore=0 mlxscore=0 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312140035 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" plpar_hcall provides to the hypervisor a buffer where return data should be placed. The hypervisor initializes the buffers which is not visible to KMSAN so unpoison them manually. Signed-off-by: Nicholas Miehlbradt --- arch/powerpc/platforms/pseries/hvconsole.c | 2 ++ arch/powerpc/sysdev/xive/spapr.c | 3 +++ 2 files changed, 5 insertions(+) diff --git a/arch/powerpc/platforms/pseries/hvconsole.c b/arch/powerpc/plat= forms/pseries/hvconsole.c index 1ac52963e08b..7ad66acd5db8 100644 --- a/arch/powerpc/platforms/pseries/hvconsole.c +++ b/arch/powerpc/platforms/pseries/hvconsole.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -32,6 +33,7 @@ int hvc_get_chars(uint32_t vtermno, char *buf, int count) unsigned long *lbuf =3D (unsigned long *)buf; =20 ret =3D plpar_hcall(H_GET_TERM_CHAR, retbuf, vtermno); + kmsan_unpoison_memory(retbuf, sizeof(retbuf)); lbuf[0] =3D be64_to_cpu(retbuf[1]); lbuf[1] =3D be64_to_cpu(retbuf[2]); =20 diff --git a/arch/powerpc/sysdev/xive/spapr.c b/arch/powerpc/sysdev/xive/sp= apr.c index e45419264391..a9f48a336e4d 100644 --- a/arch/powerpc/sysdev/xive/spapr.c +++ b/arch/powerpc/sysdev/xive/spapr.c @@ -20,6 +20,7 @@ #include #include #include +#include =20 #include #include @@ -191,6 +192,8 @@ static long plpar_int_get_source_info(unsigned long fla= gs, return rc; } =20 + kmsan_unpoison_memory(retbuf, sizeof(retbuf)); + *src_flags =3D retbuf[0]; *eoi_page =3D retbuf[1]; *trig_page =3D retbuf[2]; --=20 2.40.1