From 1ccb57efbcb7c2179230c1c01a0a4653e926267e Mon Sep 17 00:00:00 2001
From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Wed, 16 Dec 2015 14:35:16 +0100
Subject: [PATCH] time.2: Where time() is provided by vDSO, an invalid address
 may give SIGSEGV

Reported-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man2/time.2 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/man2/time.2 b/man2/time.2
index 38c0b7f23..d21eb029a 100644
--- a/man2/time.2
+++ b/man2/time.2
@@ -52,6 +52,15 @@ appropriately.
 .B EFAULT
 .I t
 points outside your accessible address space.
+
+On systems where the C library
+.BR time ()
+wrapper function invokes an implementation provided by the
+.BR vdso (7)
+(so that there is no trap into the kernel),
+an invalid address may instead trigger a
+.B SIGSEGV
+signal.
 .SH CONFORMING TO
 SVr4, 4.3BSD, C89, C99, POSIX.1-2001.
 .\" .br