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Tue, 7 Feb 2023 01:58:18 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5029F20040; Tue, 7 Feb 2023 01:58:18 +0000 (GMT) Received: from ozlabs.au.ibm.com (unknown [9.192.253.14]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 7 Feb 2023 01:58:18 +0000 (GMT) Received: from li-0d7fa1cc-2c9d-11b2-a85c-aed20764436d.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 87589606E6; Tue, 7 Feb 2023 12:58:16 +1100 (AEDT) From: Benjamin Gray To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH 2/3] powerpc/64: Convert patch_instruction() to patch_u32() Date: Tue, 7 Feb 2023 12:56:42 +1100 Message-Id: <20230207015643.590684-3-bgray@linux.ibm.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230207015643.590684-1-bgray@linux.ibm.com> References: <20230207015643.590684-1-bgray@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: B34A0sdvt01f1SkNmXTepS9wvWl4v3xH X-Proofpoint-ORIG-GUID: WYBtwrhHZhzMfyOi2mOKrutR5X14tJzV X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-02-06_07,2023-02-06_03,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 mlxlogscore=705 phishscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 impostorscore=0 spamscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302070012 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: erhard_f@mailbox.org, npiggin@gmail.com, 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. Signed-off-by: Benjamin Gray --- patch_u64() should be more efficient, but judging from the bug report[1] it doesn't seem like the data is doubleword aligned. [1]: https://lore.kernel.org/all/20230203004649.1f59dbd4@yea/ --- 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 2ac78d207f77..a1693d38eb27 100644 --- a/arch/powerpc/kernel/module_64.c +++ b/arch/powerpc/kernel/module_64.c @@ -458,12 +458,11 @@ 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;