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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 19 Aug 2019 17:52:15 +0100 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x7JGqEim56557794 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Aug 2019 16:52:14 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A8B8AA405F; Mon, 19 Aug 2019 16:52:14 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4A728A4054; Mon, 19 Aug 2019 16:52:14 +0000 (GMT) Received: from localhost (unknown [9.85.69.174]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 19 Aug 2019 16:52:14 +0000 (GMT) Date: Mon, 19 Aug 2019 22:22:12 +0530 From: "Naveen N. Rao" Subject: Re: [PATCH 4/4] arm64: implement KPROBES_ON_FTRACE To: Anil S Keshavamurthy , Borislav Petkov , Catalin Marinas , "David S. Miller" , "H. Peter Anvin" , Jisheng Zhang , =?iso-8859-1?q?Masami=0A?= Hiramatsu , Ingo Molnar , Steven Rostedt , Thomas Gleixner , Will Deacon Cc: "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "x86@kernel.org" References: <20190819192422.5ed79702@xhacker.debian> <20190819192706.46ce2c1d@xhacker.debian> In-Reply-To: <20190819192706.46ce2c1d@xhacker.debian> MIME-Version: 1.0 User-Agent: astroid/0.15.0 (https://github.com/astroidmail/astroid) Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8BIT X-TM-AS-GCONF: 00 x-cbid: 19081916-4275-0000-0000-0000035ACDDB X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19081916-4276-0000-0000-0000386CEB6B Message-Id: <1566232996.v8nlwmnjqa.naveen@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-08-19_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=591 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908190178 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jisheng Zhang wrote: > This patch implements KPROBES_ON_FTRACE for arm64. > > ~ # mount -t debugfs debugfs /sys/kernel/debug/ > ~ # cd /sys/kernel/debug/ > /sys/kernel/debug # echo 'p _do_fork' > tracing/kprobe_events > > before the patch: > > /sys/kernel/debug # cat kprobes/list > ffffff801009ff7c k _do_fork+0x4 [DISABLED] This looks wrong -- we should not be allowing kprobe to be registered on ftrace address without KPROBES_ON_FTRACE. Is _do_fork+0x4 the location of ftrace entry on arm64? - Naveen