[PATCH] Cygwin: Zero out gmon header before use

Mark Geisert mark@maxrnd.com
Wed Jun 23 08:56:14 GMT 2021


Tools that process gmon.out files can be confused by gmon header fields
with garbage in them due to lack of initialization.  Repair that.

---
 winsup/cygwin/gmon.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/winsup/cygwin/gmon.c b/winsup/cygwin/gmon.c
index b31842cd9..8b1c449c4 100644
--- a/winsup/cygwin/gmon.c
+++ b/winsup/cygwin/gmon.c
@@ -224,6 +224,7 @@ _mcleanup(void)
 	write(log, dbuf, len);
 #endif
 	hdr = (struct gmonhdr *)&gmonhdr;
+	bzero(hdr, sizeof *hdr);
 	hdr->lpc = p->lowpc;
 	hdr->hpc = p->highpc;
 	hdr->ncnt = p->kcountsize + sizeof(gmonhdr);
-- 
2.31.1



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