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Thu, 13 Jun 2024 15:39:37 +0000 (GMT) From: Ilya Leoshkevich To: Alexander Gordeev , Alexander Potapenko , Andrew Morton , Christoph Lameter , David Rientjes , Heiko Carstens , Joonsoo Kim , Marco Elver , Masami Hiramatsu , Pekka Enberg , Steven Rostedt , Vasily Gorbik , Vlastimil Babka Cc: Christian Borntraeger , Dmitry Vyukov , 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 , Roman Gushchin , Sven Schnelle , Ilya Leoshkevich Subject: [PATCH v4 09/35] kmsan: Expose kmsan_get_metadata() Date: Thu, 13 Jun 2024 17:34:11 +0200 Message-ID: <20240613153924.961511-10-iii@linux.ibm.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240613153924.961511-1-iii@linux.ibm.com> References: <20240613153924.961511-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: DNHr_yy1T_Z01HP8UOfToGMrh2Q-YjYa X-Proofpoint-ORIG-GUID: _fT-888Ew5czqGiJ_jte1hCxiA1X8Tlx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-13_09,2024-06-13_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 phishscore=0 clxscore=1015 malwarescore=0 mlxscore=0 bulkscore=0 impostorscore=0 mlxlogscore=877 priorityscore=1501 spamscore=0 suspectscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406130112 X-Stat-Signature: ufk1yjtzythn151cri1b7gt7djunngbm X-Rspamd-Queue-Id: ED4D520011 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1718293193-646335 X-HE-Meta: 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 AM1hjUPo N3/RaFJKWYIofAeqU11kCn7XE1Q032TzjgnCk2PGMqUV/Ps0vFzCj/32V5TBSaP+TaYD5pfXNS3ANtNHT2jRRLdnOdo9fLEDXpfHteveyfs2ln53mzeErVPfOlLtzjwDo1SkQvnh0egB98fbKZhtk8cN99R09AEw/bFzlKYgI8xnfMNpFgvrQdN4PFCP+Pi8lgWZhHUXRNbH+93bCvfW9KcSVmlTFja5+gT2Z7OU/uuBEOcdA6bg/tIXIQ949kx/upKBttgTBIQNInA0Kl5EbFJaRpqrtb7LYz+XQoXBOn3cFZkPtAfTzJq8slBdOjFEez3tlCwVFUi1PaLA= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Each s390 CPU has lowcore pages associated with it. Each CPU sees its own lowcore at virtual address 0 through a hardware mechanism called prefixing. Additionally, all lowcores are mapped to non-0 virtual addresses stored in the lowcore_ptr[] array. When lowcore is accessed through virtual address 0, one needs to resolve metadata for lowcore_ptr[raw_smp_processor_id()]. Expose kmsan_get_metadata() to make it possible to do this from the arch code. Signed-off-by: Ilya Leoshkevich Reviewed-by: Alexander Potapenko --- include/linux/kmsan.h | 9 +++++++++ mm/kmsan/instrumentation.c | 1 + mm/kmsan/kmsan.h | 1 - 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/include/linux/kmsan.h b/include/linux/kmsan.h index e0c23a32cdf0..fe6c2212bdb1 100644 --- a/include/linux/kmsan.h +++ b/include/linux/kmsan.h @@ -230,6 +230,15 @@ void kmsan_handle_urb(const struct urb *urb, bool is_out); */ void kmsan_unpoison_entry_regs(const struct pt_regs *regs); +/** + * kmsan_get_metadata() - Return a pointer to KMSAN shadow or origins. + * @addr: kernel address. + * @is_origin: whether to return origins or shadow. + * + * Return NULL if metadata cannot be found. + */ +void *kmsan_get_metadata(void *addr, bool is_origin); + #else static inline void kmsan_init_shadow(void) diff --git a/mm/kmsan/instrumentation.c b/mm/kmsan/instrumentation.c index 8a1bbbc723ab..94b49fac9d8b 100644 --- a/mm/kmsan/instrumentation.c +++ b/mm/kmsan/instrumentation.c @@ -14,6 +14,7 @@ #include "kmsan.h" #include +#include #include #include #include diff --git a/mm/kmsan/kmsan.h b/mm/kmsan/kmsan.h index adf443bcffe8..34b83c301d57 100644 --- a/mm/kmsan/kmsan.h +++ b/mm/kmsan/kmsan.h @@ -66,7 +66,6 @@ struct shadow_origin_ptr { struct shadow_origin_ptr kmsan_get_shadow_origin_ptr(void *addr, u64 size, bool store); -void *kmsan_get_metadata(void *addr, bool is_origin); void __init kmsan_init_alloc_meta_for_range(void *start, void *end); enum kmsan_bug_reason {