linux-hardening - Re: [PATCH] checkpatch: Don't count URLs for "line too long"

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Date:   Tue, 27 Sep 2022 13:39:16 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kees Cook <keescook@...omium.org>,
        ditya Srivastava <yashsri421@...il.com>
Cc:     Andy Whitcroft <apw@...onical.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] checkpatch: Don't count URLs for "line too long"

On Tue, 2022-09-27 at 07:07 -0700, Kees Cook wrote:
> On Mon, Sep 26, 2022 at 10:40:50PM -0700, Joe Perches wrote:
> > On Mon, 2022-09-26 at 19:15 -0700, Kees Cook wrote:
> > > URLs (not in a Link: field) should be ignored for "line too long"
> > > warnings. Allow any line containing "https://" or "http://".
> > 
> > More generally, this should be for any URI
> > 
> > > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > []
> > > @@ -3175,6 +3175,8 @@ sub process {
> > >  					# file delta changes
> > >  		      $line =~ /^\s*(?:[\w\.\-\+]*\/)++[\w\.\-\+]+:/ ||
> > >  					# filename then :
> > > +		      $line =~ /https?:\/\// ||
> > > +					# URLs
> > >  		      $line =~ /^\s*(?:Fixes:|Link:|$signature_tags)/i ||
> > >  					# A Fixes: or Link: line or signature tag line
> > >  		      $commit_log_possible_stack_dump)) {
> > 
> > And I don't recollect why this wasn't applied, but I think it's a rather better,
> > more complete, patch:
> > 
> > https://lore.kernel.org/lkml/20210114073513.15773-2-yashsri421@gmail.com/
> > 
> > I believe I did ack it and forward it to Andrew Morton, but I don't
> > see it on a lore list.
> 
> Many patches have internal references in the commit log (that aren't
> appropriate for "Link:") like:
> 
> [1] https://some.domain/path/
> 
> It seems more flexible to just ignore lines with "http" in it...

URLs vs URIs which can have multiple forms.

Take a look at the results of this grep:

$ git log -1000000 --format=email --no-merges --grep='://' | grep '://' | \
  grep -v -P 'https?://' | grep -P -oh '\b\w+://' | \
  sort | uniq -c | sort -rn
    422 git://
     46 ftp://
     15 file://
     10 smb://
      5 c://
      3 usbip://
      2 svn://
      2 rsync://
      2 pvr://
      1 ttp://
      1 systemd://
      1 server://
      1 radio://
      1 nbd://
      1 irc://
      1 intel_bts://
      1 htp://
      1 40176://

The more inclusve search pattern finds many uses of git:// and ftp:// 
(and probably a few typos too)

Assuming the URI scheme uses ://, it's perhaps reasonable to change the
suggested search in Aditya's patch from

+			if ($line =~ /^\s*([a-z][\w\.\+\-]*:\/\/\S+)/i) {

to maybe something like this so the URI's use of :// is more obvious

+			if ($line =~ m@^.*\b([a-z][\w\.\+\-]*://\S+)@i) {