In ntp-4.2.8p1 the segment access was made configurable with the
refclock mode option. Set the mode to 1 to create all SHM segments
with owner-only access.
---
timemaster.8 | 10 ++++++----
timemaster.c | 3 ++-
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/timemaster.8 b/timemaster.8
index 9a3ddb4..062322b 100644
--- a/timemaster.8
+++ b/timemaster.8
@@ -250,10 +250,12 @@ for PTP sources (\fBntp_poll\fR) to specify a subsecond
interval.
The \fBntpd\fR limitations are:
.RS
-Only the first two shared-memory segments created by the SHM refclock driver
-in \fBntpd\fR have owner-only access. Other segments are created with world
-access, possibly allowing any user on the system writing to the segments and
-disrupting the synchronization.
+In versions before 4.2.8p1, only the first two shared-memory segments created
by
+the \fBntpd\fR SHM refclock driver have owner-only access. Other segments
+are created with world access, which allows any user on the system to write to
+the segments and disrupt or take control over the synchronization of the clock.
+In 4.2.8p1 the access was made configurable with the mode option, which is set
+by \fBtimemaster\fR for owner-ownly access.
The shortest polling interval for all sources is 3 (8 seconds).
diff --git a/timemaster.c b/timemaster.c
index 83a5b83..eec0d0d 100644
--- a/timemaster.c
+++ b/timemaster.c
@@ -623,7 +623,8 @@ static void add_shm_source(int shm_segment, int poll, int
dpoll, double delay,
break;
case NTPD:
string_appendf(ntp_config,
- "server 127.127.28.%d minpoll %d maxpoll %d\n"
+ "server 127.127.28.%d minpoll %d maxpoll %d "
+ "mode 1\n"
"fudge 127.127.28.%d refid %s\n",
shm_segment, poll, poll, shm_segment, refid);
break;
--
2.1.0
------------------------------------------------------------------------------
Dive into the World of Parallel Programming. The Go Parallel Website,
sponsored by Intel and developed in partnership with Slashdot Media, is your
hub for all things parallel software development, from weekly thought
leadership blogs to news, videos, case studies, tutorials and more. Take a
look and join the conversation now. http://goparallel.sourceforge.net/
_______________________________________________
Linuxptp-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
