From patchwork Thu Mar 9 18:00:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hari Bathini X-Patchwork-Id: 13168030 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 40696C742A7 for ; Thu, 9 Mar 2023 18:01:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229887AbjCISBG (ORCPT ); Thu, 9 Mar 2023 13:01:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44632 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229574AbjCISBF (ORCPT ); Thu, 9 Mar 2023 13:01:05 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 40D33FCBC3 for ; Thu, 9 Mar 2023 10:01:04 -0800 (PST) Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 329GY65H029521; Thu, 9 Mar 2023 18:00:43 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=l5EzRfVW37ujuGj5kIADgIvR2souW09W9s/PhNaNJtM=; b=B06E3l5Z+4c7k68s/S0YWbnQwvjUR3zDGMjfyJtpnH7Zn5buHD5RlM9+YxCGvc8Q2I3s kN2DmYwbprPYoC2BHIOxYOKEx+TVeKqwfgRx0mMuLRk/cMBqDa2auNnu8aF4x6HWrGj7 lJjE5PuwueuwxDjBc8lyHtvhSlKhD5pTe6JBDfgtom+6XkPICnqMAajUTdW/Hw0uqHM7 fO7E1IuxU22Al6mloR1rVJBCf2Ns0WL5Noie+/syrPmc3KQQ+80GKI/Dq79Ps5G+q0mg 5b/lnS8/UPXt19iWW7RAKlYYftusnXra3n9oDKWBUXUy1WpypOjNcykBwiK1vvdRXXVi 1g== Received: from ppma04ams.nl.ibm.com (63.31.33a9.ip4.static.sl-reverse.com [169.51.49.99]) by mx0b-001b2d01.pphosted.com (PPS) with ESMTPS id 3p6t3c1tnf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 09 Mar 2023 18:00:43 +0000 Received: from pps.filterd (ppma04ams.nl.ibm.com [127.0.0.1]) by ppma04ams.nl.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 329GWwj3030374; Thu, 9 Mar 2023 18:00:41 GMT Received: from smtprelay05.fra02v.mail.ibm.com ([9.218.2.225]) by ppma04ams.nl.ibm.com (PPS) with ESMTPS id 3p6g862pmt-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 09 Mar 2023 18:00:40 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 329I0cC652560298 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 9 Mar 2023 18:00:38 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 89CF720049; Thu, 9 Mar 2023 18:00:38 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 77D1820040; Thu, 9 Mar 2023 18:00:36 +0000 (GMT) Received: from li-bd3f974c-2712-11b2-a85c-df1cec4d728e.ibm.com.com (unknown [9.43.13.46]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 9 Mar 2023 18:00:36 +0000 (GMT) From: Hari Bathini To: linuxppc-dev , bpf@vger.kernel.org Cc: Michael Ellerman , "Naveen N. Rao" , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Song Liu Subject: [PATCH v2 3/4] powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack Date: Thu, 9 Mar 2023 23:30:27 +0530 Message-Id: <20230309180028.180200-4-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230309180028.180200-1-hbathini@linux.ibm.com> References: <20230309180028.180200-1-hbathini@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: J5LLTBweYC2RG2Yl3TRGIVFARaGo-ipg X-Proofpoint-ORIG-GUID: J5LLTBweYC2RG2Yl3TRGIVFARaGo-ipg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-09_09,2023-03-09_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 malwarescore=0 bulkscore=0 mlxlogscore=999 spamscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 impostorscore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303090141 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Implement bpf_arch_text_invalidate and use it to fill unused part of the bpf_prog_pack with trap instructions when a BPF program is freed. Signed-off-by: Hari Bathini --- arch/powerpc/net/bpf_jit_comp.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index 0a70319116d1..d1794d9f0154 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -293,3 +293,18 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len) return ret; } + +int bpf_arch_text_invalidate(void *dst, size_t len) +{ + u32 inst = BREAKPOINT_INSTRUCTION; + int ret = -EINVAL; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return ret; + + mutex_lock(&text_mutex); + ret = patch_instructions(dst, &inst, true, len); + mutex_unlock(&text_mutex); + + return ret; +}