linux-kernel - [PATCH 1/2] ver_linux: Process input coming from procmaps that matches libc only

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Date:   Thu, 31 May 2018 22:22:46 +0300
From:   Alexander Kapshuk <alexander.kapshuk@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, alexander.kapshuk@...il.com
Subject: [PATCH 1/2] ver_linux: Process input coming from procmaps that matches libc only

Currently, input coming from /proc/self/maps is split into fields without
checking whether or not it matches libc.so. This is not efficient.
All text processing should only be performed on lines of input that
match libc.so.

Signed-off-by: Alexander Kapshuk <alexander.kapshuk@...il.com>
---
 scripts/ver_linux | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/scripts/ver_linux b/scripts/ver_linux
index 7227994ccf63..e1dc041f903f 100755
--- a/scripts/ver_linux
+++ b/scripts/ver_linux
@@ -32,11 +32,13 @@ BEGIN {
 	printversion("Nfs-utils", version("showmount --version"))
 
 	while (getline <"/proc/self/maps" > 0) {
-		n = split($0, procmaps, "/")
-		if (/libc.*so$/ && match(procmaps[n], /[0-9]+([.]?[0-9]+)+/)) {
-			ver = substr(procmaps[n], RSTART, RLENGTH)
-			printversion("Linux C Library", ver)
-			break
+		if (/libc.*\.so$/) {
+			n = split($0, procmaps, "/")
+			if (match(procmaps[n], /[0-9]+([.]?[0-9]+)+/)) {
+				ver = substr(procmaps[n], RSTART, RLENGTH)
+				printversion("Linux C Library", ver)
+				break
+			}
 		}
 	}
 
-- 
2.17.1