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Mon, 1 Jun 2026 17:46:47 +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 v5 4/6] rust: helpers: Add memchr wrapper for string operations Date: Mon, 1 Jun 2026 19:46:23 +0200 Message-ID: <20260601174625.2910233-5-japo@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260601174625.2910233-1-japo@linux.ibm.com> References: <20260601174625.2910233-1-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-Spam-Details-Enc: AW1haW4tMjYwNjAxMDE3NCBTYWx0ZWRfX7aM5zSbzJk7r 10kLoNOBcZgVXGGVBtGWKjwMUStFvEhP3SkZIB7YVeD4Gl16lIHLUTzqPWJKC8M1nGj46+L4guE SDKf5MibzsM8zQwYcRPIt/4CNTwxe0EKMSS/bYutMSiFWT+z85wAhNo/xwhjvk/PS65AnB5RLr4 /QcwAJ6ve+Aj54n7qnpj7/J+Ue5LRd/ABVjLieh/E1vrcvSg7Huk7s/xlu/BQL0/Cq8+s0OiQOP 1IfEYslPgEHVoa1w9W4eK5K8lvKPMLQsEknpoi6wIF65gkDzGP6PpQYR0sfKJswW3EdHe4r9S3c qAqmbh51zZuv/RZsRSDw2vXEOYkgfFfUcmjoQZxUvM8Vi5rJ1Kk2ERAHUSW+kWQusBvqF1V++GG RN/iBGWqLtoMavX9l2bdbQkfqpyFK0/Yo6FrpWwbXmiDJwTFdzm8tKBp2i0kkP1I3WjI19lmwJf 1hpsiHZ8i2rKRP5z9Bg== X-Proofpoint-GUID: k48lJb7CljLPFBJhcvVl881Kl2R8FCFm X-Proofpoint-ORIG-GUID: GHw6Rg5ACLDvhyGfPNgywl6s17nSxyaS X-Authority-Analysis: v=2.4 cv=DZknbPtW c=1 sm=1 tr=0 ts=6a1dc58d cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=0QoH9A0xUf0yihFjRsoA:9 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=2026-06-01_05,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 suspectscore=0 impostorscore=0 lowpriorityscore=0 phishscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606010174 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/ 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..d04340dc9139 --- /dev/null +++ b/rust/helpers/string.c @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include + +void *rust_helper_memchr(const void *s, int c, size_t n) +{ + return memchr(s, c, n); +} \ No newline at end of file -- 2.53.0