core.5: Note that not dumping core of an unreadable binary is a security measure

Reported-by: Jonny Grant <jg@jguk.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man5/core.5 b/man5/core.5
index 456366ea62856c1a8280019cd1167238ccb91e1d..0d7b7b61783af6945d54d223373ac1d90c673807 100644 (file)
--- a/man5/core.5
+++ b/man5/core.5
@@ -90,6 +90,10 @@ in
 .IP *
 The binary being executed by the process does not have read
 permission enabled.
+(This is a security measure to
+ensure that an executable whose contents are not readable
+does not produce a\(empossibly readable\(emcore dump containing
+an image of the executable.)
 .IP *
 The process is executing a set-user-ID (set-group-ID) program
 that is owned by a user (group) other than the real user (group)