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[3.16-stable,03/87] modpost: expand pattern matching to support substring matches

Message ID 20170505194745.3627137-4-arnd@arndb.de
State New
Headers show
Series build warnings and errors | expand

Commit Message

Arnd Bergmann May 5, 2017, 7:46 p.m. UTC 
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>

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

-- 
2.9.0
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Patch

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 9d9c5b905b35..14e3f53ebf17 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -798,6 +798,7 @@  static int number_prefix(const char *sym)
  *   where the '1' can be any number including several digits.
  *   The $ syntax is for sections where ld append a dot number
  *   to make section name unique.
+ * "*foo*" will match a string that contains "foo"
  */
 static int match(const char *sym, const char * const pat[])
 {
@@ -806,8 +807,17 @@  static int match(const char *sym, const char * const pat[])
 		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;
 		}