Patch "modpost: expand pattern matching to support substring matches" has been added to the 3.18-stable tree

Patch "modpost: expand pattern matching to support substring matches" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    modpost: expand pattern matching to support substring matches

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     modpost-expand-pattern-matching-to-support-substring-matches.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 09c20c032b0f753969ae778d9783d946f054d7fe Mon Sep 17 00:00:00 2001
From: Paul Gortmaker <paul.gortmaker@windriver.com>
Date: Mon, 20 Apr 2015 10:20:26 +0930
Subject: modpost: expand pattern matching to support substring matches

From: Paul Gortmaker <paul.gortmaker@windriver.com>

commit 09c20c032b0f753969ae778d9783d946f054d7fe upstream.

Currently the match() function supports a leading * to match any
prefix and a trailing * to match any suffix.  However there currently
is not a combination of both that can be used to target matches of
whole families of functions that share a common substring.

Here we expand the *foo and foo* match to also support *foo* with
the goal of targeting compiler generated symbol names that contain
strings like ".constprop." and ".isra."

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 scripts/mod/modpost.c |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -776,6 +776,7 @@ static const char *sech_name(struct elf_
  * "foo" will match an exact string equal to "foo"
  * "*foo" will match a string that ends with "foo"
  * "foo*" will match a string that begins with "foo"
+ * "*foo*" will match a string that contains "foo"
  */
 static int match(const char *sym, const char * const pat[])
 {
@@ -784,8 +785,17 @@ static int match(const char *sym, const
 		p = *pat++;
 		const char *endp = p + strlen(p) - 1;
 
+		/* "*foo*" */
+		if (*p == '*' && *endp == '*') {
+			char *here, *bare = strndup(p + 1, strlen(p) - 2);
+
+			here = strstr(sym, bare);
+			free(bare);
+			if (here != NULL)
+				return 1;
+		}
 		/* "*foo" */
-		if (*p == '*') {
+		else if (*p == '*') {
 			if (strrcmp(sym, p + 1) == 0)
 				return 1;
 		}


Patches currently in stable-queue which might be from paul.gortmaker@windriver.com are

queue-3.18/modpost-don-t-emit-section-mismatch-warnings-for-compiler-optimizations.patch
queue-3.18/modpost-expand-pattern-matching-to-support-substring-matches.patch