[PATCH v1 1/4] perf find-map: Remove PATH_MAX 128-byte stack array restriction

[Ian Rogers <irogers@google.com>]

Use getline() to dynamically allocate the required line buffer for maps
parsing, guaranteeing bounds safety and preventing buffer overruns.

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/find-map.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/find-map.c b/tools/perf/util/find-map.c
index 7b2300588ece..4d740b32814f 100644
--- a/tools/perf/util/find-map.c
+++ b/tools/perf/util/find-map.c
@@ -1,8 +1,14 @@
 // SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
 static int find_map(void **start, void **end, const char *name)
 {
 	FILE *maps;
-	char line[128];
+	char *line = NULL;
+	size_t len = 0;
+	ssize_t read_ret;
 	int found = 0;
 
 	maps = fopen("/proc/self/maps", "r");
@@ -11,7 +17,7 @@ static int find_map(void **start, void **end, const char *name)
 		return -1;
 	}
 
-	while (!found && fgets(line, sizeof(line), maps)) {
+	while (!found && (read_ret = getline(&line, &len, maps)) != -1) {
 		int m = -1;
 
 		/* We care only about private r-x mappings. */
@@ -25,6 +31,7 @@ static int find_map(void **start, void **end, const char *name)
 			found = 1;
 	}
 
+	free(line);
 	fclose(maps);
 	return !found;
 }
-- 
2.55.0.229.g6434b31f56-goog