apparmor: fix logging of the existence test for signals

commit 98cf5bbff4 upstream.

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: f7dc4c9a85 ("apparmor: fix off-by-one comparison on MAXMAPPED_SIG")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Johansen 2018-02-01 11:24:10 +01:00 коммит произвёл Greg Kroah-Hartman
Родитель b18daa09fe
Коммит 1d0d8beb35
2 изменённых файлов: 4 добавлений и 2 удалений

Просмотреть файл

@ -2,6 +2,8 @@
#define SIGUNKNOWN 0 #define SIGUNKNOWN 0
#define MAXMAPPED_SIG 35 #define MAXMAPPED_SIG 35
#define MAXMAPPED_SIGNAME (MAXMAPPED_SIG + 1)
/* provide a mapping of arch signal to internal signal # for mediation /* provide a mapping of arch signal to internal signal # for mediation
* those that are always an alias SIGCLD for SIGCLHD and SIGPOLL for SIGIO * 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 * 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 */ /* 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", "unknown",
"hup", "hup",
"int", "int",

Просмотреть файл

@ -174,7 +174,7 @@ static void audit_signal_cb(struct audit_buffer *ab, void *va)
audit_signal_mask(ab, aad(sa)->denied); 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]); audit_log_format(ab, " signal=%s", sig_names[aad(sa)->signal]);
else else
audit_log_format(ab, " signal=rtmin+%d", audit_log_format(ab, " signal=rtmin+%d",