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Mon, 12 Oct 2020 07:16:31 -0700 (PDT) From: Lukas Bulwahn X-Google-Original-From: Lukas Bulwahn Date: Mon, 12 Oct 2020 16:16:30 +0200 (CEST) X-X-Sender: lukas@felia To: Ujjwal Kumar In-Reply-To: <5a3fc45f-e5d7-da3d-4b4b-2a23512ff8de@gmail.com> Message-ID: References: <20201012054943.1196031-1-ujjwalkumar0501@gmail.com> <63053585d41ff81cdaad6cb727eb83d81207041a.camel@perches.com> <5a3fc45f-e5d7-da3d-4b4b-2a23512ff8de@gmail.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Cc: Joe Perches , linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: Re: [Linux-kernel-mentees] [RFC PATCH] checkpatch: add shebang check to EXECUTE_PERMISSIONS X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" On Mon, 12 Oct 2020, Ujjwal Kumar wrote: > On 12/10/20 11:47 am, Joe Perches wrote: > > On Mon, 2020-10-12 at 11:19 +0530, Ujjwal Kumar wrote: > >> checkpatch.pl checks for invalid EXECUTE_PERMISSIONS on source > >> files. The script leverages filename extensions and its path in > >> the repository to decide whether to allow execute permissions on > >> the file or not. > >> > >> Based on current check conditions, a perl script file having > >> execute permissions, without '.pl' extension in its filename > >> and not belonging to 'scripts/' directory is reported as ERROR > >> which is a false-positive. > >> > >> Adding a shebang check along with current conditions will make > >> the check more generalised and improve checkpatch reports. > >> To do so, without breaking the core design decision of checkpatch, > >> we can fetch the first line from the patch itself and match it for > >> a shebang pattern. > >> > >> There can be cases where the first line is not part of the patch. > > > > For instance: a patch that only changes permissions > > without changing any of the file content. > > > >> > >> In that case there may be a false-positive report but in the end we > >> will have less false-positives as we will be handling some of the > >> unhandled cases. > > > >> Signed-off-by: Ujjwal Kumar > >> --- > >> Apologies, I forgot to include linux-kernel@vger.kernel.org so I'm > >> now resending. > >> > >> scripts/checkpatch.pl | 19 +++++++++++++++++++ > >> 1 file changed, 19 insertions(+) > >> > >> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl > > [] > >> @@ -1795,6 +1795,23 @@ sub get_stat_here { > >> return $herectx; > >> } > > > > First some style trivia: > > > >> +sub get_shebang { > >> + my ($linenr, $realfile) = @_; > >> + my $rawline = ""; > >> + my $shebang = ""; > >> + > >> + $rawline = raw_line($linenr, 3); > >> + if (defined $rawline && > >> + $rawline =~ /^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) { > > > > alignment to open parenthesis please > > > >> + if (defined $1 && $1 == 1) { > >> + $shebang = raw_line($linenr, 4); > >> + $shebang = substr $shebang, 1; > > > > parentheses around substr please. > > > >> + } > >> + } > >> + > >> + return $shebang; > >> +} > > > > And some real notes: > > > > $realfile isn't used in this function so there doesn't > > seem to be a reason to have it as an function argument. > > > >> + > >> sub cat_vet { > >> my ($vet) = @_; > >> my ($res, $coded); > >> @@ -2680,7 +2697,9 @@ sub process { > >> # Check for incorrect file permissions > >> if ($line =~ /^new (file )?mode.*[7531]\d{0,2}$/) { > > > > probably better here to use a capture group for the permissions > > > > if ($line =~ /^new (?:file )?mode (\d+)$/) { > > my $mode = substr($1, -3); > > This > > > > >> my $permhere = $here . "FILE: $realfile\n"; > >> + my $shebang = get_shebang($linenr, $realfile); > >> if ($realfile !~ m@scripts/@ && > > > > Maybe remove the $realfile directory test as > > there are many source files that are not scripts > > in this directory and its subdirectories. > > this > > > > >> + $shebang !~ /^#!\s*(\/\w)+.*/ && > > > > unnecessary capture group > > > > and add > > > > $mode =~ /[1357]/ && > > this > > > > >> $realfile !~ /\.(py|pl|awk|sh)$/) { > > > > No need for a a capture group here either. (existing defect) > > and this. > > > > >> ERROR("EXECUTE_PERMISSIONS", > >> "do not set execute permissions for source files\n" . $permhere); > > > > > > > > Should these new changes go as a separate patch or can they be > included in the next iteration of this patch? > > Ujjwal, please consider the following 'strategy': - Send one patch to clean up the existing implementation as Joe requested. With those 'credit points' for cleaning up the implementation, you then: - Send another clean patch for the additional functionality you propose We can probably easily accept the first cleanup, and then dig into the review of the additional functionality. Lukas _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees