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Mon, 8 Jun 2026 18:14:57 +0000 (GMT) From: Jan Polensky To: hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, ojeda@kernel.org, peterz@infradead.org, jpoimboe@kernel.org, jbaron@akamai.com, aliceryhl@google.com Cc: borntraeger@linux.ibm.com, svens@linux.ibm.com, boqun@kernel.org, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, tmgross@umich.edu, dakr@kernel.org, rostedt@goodmis.org, ardb@kernel.org, linux-s390@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, japo@linux.ibm.com (Jan Polensky) Subject: [PATCH v6 4/6] rust: helpers: Add memchr wrapper for string operations Date: Mon, 8 Jun 2026 20:14:49 +0200 Message-ID: <20260608181451.3734956-5-japo@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260608181451.3734956-1-japo@linux.ibm.com> References: <20260608181451.3734956-1-japo@linux.ibm.com> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: KgDHuFQWEO2b7jqeHFl5EHnbGbKMNcyv X-Proofpoint-GUID: 1aIC8G-_gv_EdTTuBMIHZB_S_R0gn0mO X-Authority-Analysis: v=2.4 cv=ZbEt8MVA c=1 sm=1 tr=0 ts=6a2706a6 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=0OX8x8mQKUGR4pMsIeoA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA4MDE3MCBTYWx0ZWRfX72ZFz/lDI8Uz FW1UV0gC4jCyowrnujxMHlYQRL2r/gi6JxqbL0Jq3YxmAO8IaE4QRM0+1jiWsu5OKwg2xJ9+aRx mXZRD6eacVxZrMZq3ubLvwufmZ6dIQ6nWunmordD71Nz7fZCAYkzTUS6wdkxuH5vW9KzkZiNQoX jY8T50BXVWmgMaaxuImiRTuzr7EibZ1puqi0oyHmEta0wYw4I33+eiG1pS5puMM/6P1uukdXWCt bjDdokwnPpXpnAKbfOGIbQKlBCyalesWHMuBZNrQZY4iOlnKXgCOFNBPB0fnBB6Lg81oPBMGcV6 XWMcnnHv4LGcM3KVeV/hKg5k+Seu8hbC60ZcjvW4oj8PL8Yp05nnAun9rZm0H1lhdaF3q+sZsqS Sfj2BS0Hrvf6p9FLeQQ4O2WfdHkAY2mqCNlAk1q0f57crnljN9004xjsS46E3vw2DclGy0mULJf dfV6nVDrJJD7rQJIIIQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-08_04,2026-06-05_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 spamscore=0 priorityscore=1501 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606080170 Add a dedicated string helper file with a memchr wrapper that uses the kernel's instrumented memchr() function to ensure KASAN and FORTIFY_SOURCE protections are preserved for Rust code. Reported-by: Miguel Ojeda Link: https://lore.kernel.org/rust-for-linux/CANiq72mXAZc0sNM7ShX8VDVs_7zJddawP-e=wt+ERr1YUCcWUw@mail.gmail.com/ Acked-by: Heiko Carstens Signed-off-by: Jan Polensky --- rust/helpers/helpers.c | 1 + rust/helpers/string.c | 8 ++++++++ 2 files changed, 9 insertions(+) create mode 100644 rust/helpers/string.c diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c index 625921e27dfb..592b9bdb4e4a 100644 --- a/rust/helpers/helpers.c +++ b/rust/helpers/helpers.c @@ -88,6 +88,7 @@ #include "signal.c" #include "slab.c" #include "spinlock.c" +#include "string.c" #include "sync.c" #include "task.c" #include "time.c" diff --git a/rust/helpers/string.c b/rust/helpers/string.c new file mode 100644 index 000000000000..8ef30eb07a15 --- /dev/null +++ b/rust/helpers/string.c @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include + +__rust_helper void *rust_helper_memchr(const void *s, int c, size_t n) +{ + return memchr(s, c, n); +} -- 2.53.0