apparmor: fix logging of the existence test for signals

BugLink: http://bugs.launchpad.net/bugs/1763427
The existence test is not being properly logged as the signal mapping
maps it to the last entry in the named signal table. This is done
to help catch bugs by making the 0 mapped signal value invalid so
that we can catch the signal value not being filled in.

When fixing the off-by-one comparision logic the reporting of the
existence test was broken, because the logic behind the mapped named
table was hidden. Fix this by adding a define for the name lookup
and using it.

Cc: Stable <stable@vger.kernel.org>
Fixes: f7dc4c9a855a1 ("apparmor: fix off-by-one comparison on MAXMAPPED_SIG")
Signed-off-by: John Johansen <john.johansen@canonical.com>
(cherry picked from commit 98cf5bbff413eadf1b9cb195a7b80cc61c72a50e
 git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

diff --git a/security/apparmor/include/sig_names.h b/security/apparmor/include/sig_names.h
index 92e62fe952926b5abdc3348884d8e2fc6b966f1d..5ca47c50dfa73430f3263d2bf6746b956046fe3e 100644 (file)
--- a/security/apparmor/include/sig_names.h
+++ b/security/apparmor/include/sig_names.h
@@ -2,6 +2,8 @@
 
 #define SIGUNKNOWN 0
 #define MAXMAPPED_SIG 35
+#define MAXMAPPED_SIGNAME (MAXMAPPED_SIG + 1)
+
 /* provide a mapping of arch signal to internal signal # for mediation
  * those that are always an alias SIGCLD for SIGCLHD and SIGPOLL for SIGIO
  * map to the same entry those that may/or may not get a separate entry
@@ -56,7 +58,7 @@ static const int sig_map[MAXMAPPED_SIG] = {
 };
 
 /* this table is ordered post sig_map[sig] mapping */
-static const char *const sig_names[MAXMAPPED_SIG + 1] = {
+static const char *const sig_names[MAXMAPPED_SIGNAME] = {
        "unknown",
        "hup",
        "int",

diff --git a/security/apparmor/ipc.c b/security/apparmor/ipc.c
index b40678f3c1d5a4d62eeb1255f26e2a73aabd6767..586facd35f7c0778a1b30d580527b596ecf1fd21 100644 (file)
--- a/security/apparmor/ipc.c
+++ b/security/apparmor/ipc.c
@@ -174,7 +174,7 @@ static void audit_signal_cb(struct audit_buffer *ab, void *va)
                        audit_signal_mask(ab, aad(sa)->denied);
                }
        }
-       if (aad(sa)->signal < MAXMAPPED_SIG)
+       if (aad(sa)->signal < MAXMAPPED_SIGNAME)
                audit_log_format(ab, " signal=%s", sig_names[aad(sa)->signal]);
        else
                audit_log_format(ab, " signal=rtmin+%d",