[PATCH] valgrind: ignore SSE-based strlen invalid reads

From: Carlos Martín Nieto <cmn@elego.de>
Date: Mar 16, 2011, 10:47 UTC
Message-ID: <1300272453-25891-1-git-send-email-cmn@elego.de>
In-Reply-To: <20110316095632.GA8277@elie>

The GNU C Library (glibc) uses SSE instructions to make strlen (among others) faster, loading 4 bytes at a time and reading past the end of the allocated memory. This read is safe and when the strlen function is inlined, it is (obviously) not replaced by valgrind, which reports a false-possitive.

Tell valgrind to ignore this particular error, as the read is, in fact, safe.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>
---
 t/valgrind/default.supp |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/t/valgrind/default.supp b/t/valgrind/default.supp
index 9e013fa..327478c 100644
--- a/t/valgrind/default.supp
+++ b/t/valgrind/default.supp
@@ -43,3 +43,9 @@
 	fun:write_buffer
 	fun:write_loose_object
 }
+
+{
+	ignore-sse-strlen-invalid-read-size
+	Memcheck:Addr4
+	fun:copy_ref
+}
\ No newline at end of file

-- 
1.7.4.1