From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga17.intel.com ([192.55.52.151]:4943 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229608AbhEJGSe (ORCPT ); Mon, 10 May 2021 02:18:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel.onmicrosoft.com; s=selector2-intel-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=d0RnPQfvRWNLjkcUlM9zbUA0JrYPTdc56uU+3FJT2Xw=; b=qJOTzoYX1/OZdO4nqY5RIS4C9dp3j5mlGiY28XAFpPcCYRtEKiSqcQC1nHAJ0kdG0YPxYf1GP8mzWp6xGBq+OpaRGVQnthCt9Wv3lG7jnoXYkjdOg4XoIGZc0Fq6o48dRAiKSXI9FsYpR8Eu25o7JJa4j937fWYoboNDfQBweS0= From: "Reshetova, Elena" Subject: RE: Smatch mailing list archives Date: Mon, 10 May 2021 06:17:27 +0000 Message-ID: References: <20210508051626.GI1955@kadam> In-Reply-To: <20210508051626.GI1955@kadam> Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 List-ID: To: Dan Carpenter Cc: "smatch@vger.kernel.org" , "Kleen, Andi" > On Fri, May 07, 2021 at 02:22:37PM +0000, Reshetova, Elena wrote: > > Hi, > > > > I have been working for a while now on a new smatch pattern, but > > would really appreciate additional information points such as past > > email discussions, etc. > > > > So I am wondering if there is a way to browse through > > the archives of this mailing list in order to try to find the > > information I need? >=20 > Sorry, I don't think it's archived anywhere. There isn't a lot of > traffic on the list. About three times a year someone reports that > Smatch is crashing for them. >=20 > I'm always happy to answer questions if there is any way I can help? Thank you Dan! I am pretty new with smatch so that's why I was hoping to browse through the existing mails to see if my simple questions are already answered, but here is my current issue.=20 What is the best way to create identifiers for the findings that certain sm= atch pattern finds in the kernel? Let's say I have a new pattern that is able to= find different problematic places and report them in usual smatch way: errors an= d warnings with file name, line number, function name, etc.=20 Now for our pattern in order to be sure that the reported issue exists/does= not exists, somebody needs to go and look at the code manually and make a call.= =20 After this, it would be nice to mark this place as safe/concern in the repo= rt and be able to transfer these results for kernel versions bumps (5.11->5.12, etc.)= as soon as the code in this function where finding was reported has not changed (and t= here might be multiple findings per function). What is the best way of doing it?=20 I was first thinking of using some simple hash for the reported line (lines= around, relative position within the reported function), but now I think I need also to hash the whole function in addition to the f= inding itself.=20 Then the logic of transferring the result would be: For each finding calculate:=20 1. finding_line_hash: the hash of the line that resulted in finding (becom= es a unique id within the function). 2. finding_function_hash: the hash of the function that produced the findin= g (becomes a unique global id within the kernel) and helps to determine if the functi= on has not been changed between the kernel versions.=20 Logic for the result transfer:=20 If both finding_line_hash and finding_function_hash match between the two s= match reports for two different versions, then it is relatively safe to transfer this con= crete smatch finding and its manual audit result automatically. Does it make sense overall? If yes, what is the easiest way in smatch to ge= t hash data for=20 1 and 2? I.e. get full reported line as a string and full function content = as a string?=20 Best Regards, Elena. =20