From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (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 152D8AD5E; Tue, 5 Mar 2024 05:48:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709617696; cv=none; b=PzFhQUFUakZnQDsLSoV0J871O/V6EtS7r4d4Qkd6PgTkw5e1avGN88SdTW4OAXSx2QE5lSXhhS30aiDeyC0JwdMYmr78cEzH/Ok4YoeGo31ILGqsFSxf7VEVeHVkD0tZdY0wlOTGbpO4V0Y7lp8suSyj7lsL4/a0Ute43/2osHo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709617696; c=relaxed/simple; bh=fAkvfoJdCmBA/dOW+GxOkuZlb2R5x+NWMQ8XkkvwPBE=; h=Content-Type:Subject:From:In-Reply-To:Date:Cc:Message-Id: References:To:MIME-Version; b=eaTZxxptBBD015SRHFVSEdFq5uc6f43rXP71Q2WPapEGsDrAsk5sfjLOOkxVadIuvsVTxoZEKmZiiH+ckUdFiLXpiwbHvTVOpvbUlhHomKCeJ+GoCrF09O4/xnt+EG7RPQqaFkKv5BIy6KBZJZtwqcjWaJmosBzBymc7dt9rz5Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=NVqAOJDY; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="NVqAOJDY" Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 4255ZVLG019594; Tue, 5 Mar 2024 05:48:08 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=content-type : subject : from : in-reply-to : date : cc : message-id : references : to : content-transfer-encoding : mime-version; s=pp1; bh=KklhlwyuVBeNesq5FVkCo2afhv7RjYPRwek10Wa6HP4=; b=NVqAOJDYTAQiL/Og+Dq5jGEbNRINP+FB5OdtM4oiAb/gcG+ZRAaNiPbDBsI7vCPsIrfW RzjG3zYm/xxXRaqj5rXcHOUMBLKq7s3nhqS3QnG06ZNf/4NvHQNyibp9bcgow0b8IMgN Kw71r5Q+3+sicnxCP9e6yXYG23pKstmRnKlXI72+SNXAsO+pYohmhzTikmkXoEhPRkm5 vzAWB4Wv/raexenYGx6W0754CSbPD5UNkIW0DMnaREPT3Qz1hI8El5oxBnQlJaKAkC9A srJbsC7lFW4SQjgar8A1Efq1dwt2rRUsjH9lDDL03zxZGOP0Hp/0O82AVWJUtyaW2reZ 6w== 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 3wnvyb8vds-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 05 Mar 2024 05:48:07 +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 4254S2Tb026251; Tue, 5 Mar 2024 05:48:06 GMT Received: from smtprelay01.fra02v.mail.ibm.com ([9.218.2.227]) by ppma21.wdc07v.mail.ibm.com (PPS) with ESMTPS id 3wmfennh0v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 05 Mar 2024 05:48:06 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 4255m2wT9700006 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 5 Mar 2024 05:48:04 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 89F9720040; Tue, 5 Mar 2024 05:48:02 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E1DD72005A; Tue, 5 Mar 2024 05:48:00 +0000 (GMT) Received: from smtpclient.apple (unknown [9.43.110.47]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 5 Mar 2024 05:48:00 +0000 (GMT) Content-Type: text/plain; charset=utf-8 Subject: Re: [PATCH] tracing: Remove precision vsnprintf() check from print event From: Sachin Sant In-Reply-To: <20240304174341.2a561d9f@gandalf.local.home> Date: Tue, 5 Mar 2024 11:17:49 +0530 Cc: LKML , Linux Trace Kernel , Masami Hiramatsu , Mathieu Desnoyers , Linus Torvalds Message-Id: References: <20240304174341.2a561d9f@gandalf.local.home> To: Steven Rostedt X-Mailer: Apple Mail (2.3774.400.31) X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 6v3BOyvB_pPa_8F5sr7aqSjU2BITv7tW X-Proofpoint-GUID: 6v3BOyvB_pPa_8F5sr7aqSjU2BITv7tW Content-Transfer-Encoding: quoted-printable X-Proofpoint-UnRewURL: 0 URL was un-rewritten Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-05_03,2024-03-04_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 priorityscore=1501 mlxscore=0 spamscore=0 malwarescore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2403050043 > On 05-Mar-2024, at 4:13=E2=80=AFAM, Steven Rostedt = wrote: >=20 > From: "Steven Rostedt (Google)" >=20 > This reverts 60be76eeabb3d ("tracing: Add size check when printing > trace_marker output"). The only reason the precision check was added > was because of a bug that miscalculated the write size of the string into > the ring buffer and it truncated it removing the terminating nul byte. On > reading the trace it crashed the kernel. But this was due to the bug in > the code that happened during development and should never happen in > practice. If anything, the precision can hide bugs where the string in the > ring buffer isn't nul terminated and it will not be checked. >=20 > Link: https://lore.kernel.org/all/C7E7AF1A-D30F-4D18-B8E5-AF1EF58004F5@li= nux.ibm.com/ > Link: https://lore.kernel.org/linux-trace-kernel/20240227125706.04279ac2@= gandalf.local.home > Link: https://lore.kernel.org/all/20240302111244.3a1674be@gandalf.local.h= ome/ >=20 > Reported-by: Sachin Sant > Fixes: 60be76eeabb3d ("tracing: Add size check when printing trace_marker= output") > Signed-off-by: Steven Rostedt (Google) > --- This fixes the reported problem for me. All the ftrace selftests complete without any fails. # of passed: 121 # of failed: 0 # of unresolved: 6 # of untested: 0 # of unsupported: 7 # of xfailed: 1 # of undefined(test bug): 0 Tested-by: Sachin Sant =E2=80=94 Sachin