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Wed, 2 Sep 2026 21:24:02 +0000 (GMT) From: Ilya Leoshkevich To: Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: David Laight , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Ilya Leoshkevich Subject: [PATCH v4 0/2] s390: Warn if kernel command line contains non-printable EBCDIC characters Date: Wed, 2 Sep 2026 23:20:16 +0200 Message-ID: <20260902212400.674450-1-iii@linux.ibm.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-s390@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: AW1haW4tMjYwOTAyMDE4NiBTYWx0ZWRfX54ZZ7kO1RzSP NkxpMwLB3fJxG0UDsKpTM9BlSVO5Eyo+52X6zayQmnd6P/HBc0cXsiz3VbNB9Kfnj/63VUSy0Z4 TK1lWZRH0A+7wC6iRPsqI2Tzn+n0KTkvhgmAoOMmKURANyqNVOMQ6g4yWtI1PDgtTKF0cQBtWrt sChYO2tRIdPTOy2uRB0qnbgpkS/RGrlSQjQibTHBXUoUGPi5BTKv3tEhVXsWt+l3wXN4r9pvW0E ZpA0SmkM5DJvvBrJcZa7qblXCAcRFznbK1MlB0uCGPpgl4tpGoegtyjzWATeLlKVg9vE5fiXKT3 /SOnd+g6XH7YYzC9L/s8Mi/xtoIzOn16UgllQLLzFAEUbwLkPT31Q+OhkiDu0z3NGZI8ziF0mkz vdT0F4mGqNv4ln7ZSjZ/7Wzr3zTtOvi8z+LMUmCv6HQr6QBI/PtBbDdHuVQAGYXgY4WbpWRMgq3 nBN3fvRnVUMeaLlxjtA== X-Proofpoint-ORIG-GUID: xSy_sljBpCWE_75ZekpKSUv-hN7YLIIX X-Authority-Analysis: v=2.4 cv=CNgamxrD c=1 sm=1 tr=0 ts=6a9893f8 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=I9JzLZ9WWtcXjXHc-4gA:9 X-Proofpoint-GUID: N5zxKbW1nM8uKIf8qGYbFU3MPBMWaLK2 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTAyMDE4NiBTYWx0ZWRfXxpdAUXdRr3VU aM8oeLRLITj3eAgvLcoEEnmvi5u7oJC1csTI9fO2epY14hq6rnsX0rdf89Pa9Tpp/tD3NeHpiWp tXAWr3Ml9VX0SIl0hxfjQjBC/7ILnLA= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-02_05,2026-09-02_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 adultscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609020186 v3: https://lore.kernel.org/linux-s390/20260828140057.1728173-1-iii@linux.ibm.com/ v3 -> v4: Switch to ASCII subset of EBCDIC (Sashiko, Heiko). Add and use isspace_ebc_asc() to satisfy Heiko's comment about newlines in v1. v2: https://lore.kernel.org/all/20260826150702.949956-1-iii@linux.ibm.com/ v2 -> v3: Check whether source EBCDIC characters are printable (David, Heiko). v1: https://lore.kernel.org/all/20260825150840.537653-1-iii@linux.ibm.com/ v1 -> v2: Account for newlines (Heiko). Minor stylistic improvements: inline int i, bool return type, comment modality. Hi, This series adds a warning for unintentional EBCDIC -> ASCII kernel command line translations. Patch 1 adds EBCDIC character classes. Patch 2 uses them for determining whether the command line is printable. Best regards, Ilya Ilya Leoshkevich (2): s390/ebcdic: Add character classes for the ASCII subset of EBCDIC s390: Warn if kernel command line contains non-printable EBCDIC characters arch/s390/boot/ipl_parm.c | 13 ++++++++++- arch/s390/include/asm/ebcdic.h | 6 +++++ arch/s390/kernel/ebcdic.c | 40 +++++++++++++++++++++++++++++++++- 3 files changed, 57 insertions(+), 2 deletions(-) -- 2.55.0