From patchwork Fri Sep 8 13:27:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hari Bathini X-Patchwork-Id: 13377461 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 814EE63AB for ; Fri, 8 Sep 2023 13:28:19 +0000 (UTC) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A58741FC1 for ; Fri, 8 Sep 2023 06:28:14 -0700 (PDT) Received: from pps.filterd (m0353728.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 388DKfva023951; Fri, 8 Sep 2023 13:27:53 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=e1pzRfIsQNWviwQZR119p94RiwEd51lnuBA/9kOUYQ8=; b=bIx8G1ajBo9Syc9MCJY0kaXaQGknXEkxzZrrrn79+JPkeMquYjTj6gWvslKMjGDiEks3 3usPYeVjA0MwCAE3JeKmF3Cj2LpKOabO/XiK+2hahosVPQcsx6jmJB/uEilgsBNHjTqi J6diEGRXhXxaLEXKfDWIIHhzKunPn7RUgLYN+3c3v9/rIS2Z93afuPPaceJsNu8/u0hV 2w/ImtHPnEy5qFcK5in76M4vomjUndIclkVv0Iqy5xIkaM3V3PpX/L4exi6yRT5NJSp9 U4Iuq/hARzX63tjFnULmd8Zzd7Y3ItyQBpWUnnUDfklYDZ0CHMATSrWRM7DvvAnLO1ZQ gA== Received: from ppma21.wdc07v.mail.ibm.com (5b.69.3da9.ip4.static.sl-reverse.com [169.61.105.91]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3t04dsg6f9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 08 Sep 2023 13:27:52 +0000 Received: from pps.filterd (ppma21.wdc07v.mail.ibm.com [127.0.0.1]) by ppma21.wdc07v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 388DNKIl026759; Fri, 8 Sep 2023 13:27:51 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 3svgcp3vwk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 08 Sep 2023 13:27:51 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 388DRnSN5178062 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 8 Sep 2023 13:27:49 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 803822004B; Fri, 8 Sep 2023 13:27:49 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4F4AF20040; Fri, 8 Sep 2023 13:27:47 +0000 (GMT) Received: from li-bd3f974c-2712-11b2-a85c-df1cec4d728e.ibm.com.com (unknown [9.43.29.230]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 8 Sep 2023 13:27:47 +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 , Christophe Leroy Subject: [PATCH v4 2/5] powerpc/bpf: implement bpf_arch_text_invalidate for bpf_prog_pack Date: Fri, 8 Sep 2023 18:57:37 +0530 Message-ID: <20230908132740.718103-3-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230908132740.718103-1-hbathini@linux.ibm.com> References: <20230908132740.718103-1-hbathini@linux.ibm.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: lIud_GT87QPnqlLvPEp84QaNENWEjzhI X-Proofpoint-GUID: lIud_GT87QPnqlLvPEp84QaNENWEjzhI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-08_09,2023-09-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 bulkscore=0 phishscore=0 mlxlogscore=893 suspectscore=0 spamscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 mlxscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2309080121 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net 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 4f896222c579..c0036eb171f0 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -313,3 +313,18 @@ 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 insn = BREAKPOINT_INSTRUCTION; + void *ret; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return -EINVAL; + + mutex_lock(&text_mutex); + ret = bpf_patch_instructions(dst, &insn, len, true); + mutex_unlock(&text_mutex); + + return IS_ERR(ret) ? PTR_ERR(ret) : 0; +}