linux-hardening - [PATCH 2/3] leaking_addresses: Always print a trailing newline

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Message-Id: <20210924062006.231699-3-keescook@chromium.org>
Date:   Thu, 23 Sep 2021 23:20:05 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        "Tobin C. Harding" <me@...in.cc>,
        Tycho Andersen <tycho@...ho.pizza>,
        Helge Deller <deller@....de>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        Vito Caputo <vcaputo@...garu.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jann Horn <jannh@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Mark Rutland <mark.rutland@....com>,
        Jens Axboe <axboe@...nel.dk>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Stefan Metzmacher <metze@...ba.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Michal Hocko <mhocko@...e.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ohhoon Kwon <ohoono.kwon@...sung.com>,
        YiFei Zhu <yifeifz2@...inois.edu>,
        kernel test robot <oliver.sang@...el.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux-hardening@...r.kernel.org, x86@...nel.org,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH 2/3] leaking_addresses: Always print a trailing newline

For files that lack trailing newlines and match a leaking address (e.g.
wchan[1]), the leaking_addresses.pl report would run together with the
net line, making things look corrupted.

Unconditionally remove the newline on input, and write it back out on
output.

[1] https://lore.kernel.org/all/20210103142726.GC30643@xsang-OptiPlex-9020/

Cc: "Tobin C. Harding" <me@...in.cc>
Cc: Tycho Andersen <tycho@...ho.pizza>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 scripts/leaking_addresses.pl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/leaking_addresses.pl b/scripts/leaking_addresses.pl
index b2d8b8aa2d99..8f636a23bc3f 100755
--- a/scripts/leaking_addresses.pl
+++ b/scripts/leaking_addresses.pl
@@ -455,8 +455,9 @@ sub parse_file
 
 	open my $fh, "<", $file or return;
 	while ( <$fh> ) {
+		chomp;
 		if (may_leak_address($_)) {
-			print $file . ': ' . $_;
+			printf("$file: $_\n");
 		}
 	}
 	close $fh;
-- 
2.30.2