1 files changed, 61 insertions, 0 deletions
diff --git a/mtrace-Use-a-static-buffer-for-printing-BZ-25947.patch b/mtrace-Use-a-static-buffer-for-printing-BZ-25947.patch
new file mode 100644
index 0000000..9c25d43
--- /dev/null
+++ b/mtrace-Use-a-static-buffer-for-printing-BZ-25947.patch
@@ -0,0 +1,61 @@
+From dc906e94f7033892dadbd91718349f19e1376391 Mon Sep 17 00:00:00 2001
+From: Siddhesh Poyarekar <siddhesh@sourceware.org>
+Date: Thu, 12 Aug 2021 06:38:15 +0530
+Subject: [PATCH] mtrace: Use a static buffer for printing [BZ #25947]
+
+Use a static buffer for mtrace printing now that it no longer adds to
+default libc footprint.
+
+Reviewed-by: DJ Delorie <dj@redhat.com>
+---
+ malloc/mtrace-impl.c | 14 +++-----------
+ 1 file changed, 3 insertions(+), 11 deletions(-)
+
+diff --git a/malloc/mtrace-impl.c b/malloc/mtrace-impl.c
+index 0e10ab7..83008ca 100644
+--- a/malloc/mtrace-impl.c
++++ b/malloc/mtrace-impl.c
+@@ -34,11 +34,8 @@
+ 
+ #include <kernel-features.h>
+ 
+-#define TRACE_BUFFER_SIZE 512
+-
+ static FILE *mallstream;
+ static const char mallenv[] = "MALLOC_TRACE";
+-static char *malloc_trace_buffer;
+ 
+ static void
+ tr_where (const void *caller, Dl_info *info)
+@@ -184,16 +181,13 @@ do_mtrace (void)
+   mallfile = secure_getenv (mallenv);
+   if (mallfile != NULL)
+     {
+-      char *mtb = malloc (TRACE_BUFFER_SIZE);
+-      if (mtb == NULL)
+-        return;
+-
+       mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "wce");
+       if (mallstream != NULL)
+         {
+           /* Be sure it doesn't malloc its buffer!  */
+-          malloc_trace_buffer = mtb;
+-          setvbuf (mallstream, malloc_trace_buffer, _IOFBF, TRACE_BUFFER_SIZE);
++	  static char tracebuf [512];
++
++	  setvbuf (mallstream, tracebuf, _IOFBF, sizeof (tracebuf));
+           fprintf (mallstream, "= Start\n");
+           if (!added_atexit_handler)
+             {
+@@ -203,8 +197,6 @@ do_mtrace (void)
+             }
+ 	  __malloc_debug_enable (MALLOC_MTRACE_HOOK);
+         }
+-      else
+-        free (mtb);
+     }
+ }
+ 
+-- 
+1.8.3.1
+