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Mon, 16 Oct 2023 05:03:32 +0000 (GMT) Received: from bgray-lenovo-p15.ozlabs.ibm.com (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 308A66040A; Mon, 16 Oct 2023 16:03:30 +1100 (AEDT) From: Benjamin Gray To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 2/3] powerpc/64: Convert patch_instruction() to patch_u32() Date: Mon, 16 Oct 2023 16:01:46 +1100 Message-ID: <20231016050147.115686-3-bgray@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231016050147.115686-1-bgray@linux.ibm.com> References: <20231016050147.115686-1-bgray@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: kRUM_oM0c8S7CVjGD-Fx5CHFa0ytXiGe X-Proofpoint-ORIG-GUID: kRUM_oM0c8S7CVjGD-Fx5CHFa0ytXiGe X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-15_09,2023-10-12_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 malwarescore=0 impostorscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 mlxscore=0 mlxlogscore=643 clxscore=1015 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310160044 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Benjamin Gray Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This use of patch_instruction() is working on 32 bit data, and can fail if the data looks like a prefixed instruction and the extra write crosses a page boundary. Use patch_u32() to fix the write size. Fixes: 8734b41b3efe ("powerpc/module_64: Fix livepatching for RO modules") Link: https://lore.kernel.org/all/20230203004649.1f59dbd4@yea/ Signed-off-by: Benjamin Gray --- v2: * Added the fixes tag, it seems appropriate even if the subject does mention a more robust solution being required. patch_u64() should be more efficient, but judging from the bug report it doesn't seem like the data is doubleword aligned. --- arch/powerpc/kernel/module_64.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c index 7112adc597a8..e9bab599d0c2 100644 --- a/arch/powerpc/kernel/module_64.c +++ b/arch/powerpc/kernel/module_64.c @@ -651,12 +651,11 @@ static inline int create_stub(const Elf64_Shdr *sechdrs, // func_desc_t is 8 bytes if ABIv2, else 16 bytes desc = func_desc(addr); for (i = 0; i < sizeof(func_desc_t) / sizeof(u32); i++) { - if (patch_instruction(((u32 *)&entry->funcdata) + i, - ppc_inst(((u32 *)(&desc))[i]))) + if (patch_u32(((u32 *)&entry->funcdata) + i, ((u32 *)&desc)[i])) return 0; } - if (patch_instruction(&entry->magic, ppc_inst(STUB_MAGIC))) + if (patch_u32(&entry->magic, STUB_MAGIC)) return 0; return 1;