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authorJohn Johansen <john.johansen@canonical.com>2017-11-08 19:09:52 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-08 21:56:22 +0300
commitf7dc4c9a855a13dbb33294c9fc94f17af03f6291 (patch)
tree9ce322841e592dae220139d91d5e48e555987a70 /security/apparmor
parentfbc3edf7d7731d7a22c483c679700589bab936a3 (diff)
downloadlinux-f7dc4c9a855a13dbb33294c9fc94f17af03f6291.tar.xz
apparmor: fix off-by-one comparison on MAXMAPPED_SIG
This came in yesterday, and I have verified our regression tests were missing this and it can cause an oops. Please apply. There is a an off-by-one comparision on sig against MAXMAPPED_SIG that can lead to a read outside the sig_map array if sig is MAXMAPPED_SIG. Fix this. Verified that the check is an out of bounds case that can cause an oops. Revised: add comparison fix to second case Fixes: cd1dbf76b23d ("apparmor: add the ability to mediate signals") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: John Johansen <john.johansen@canonical.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'security/apparmor')
-rw-r--r--security/apparmor/ipc.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/security/apparmor/ipc.c b/security/apparmor/ipc.c
index 66fb9ede9447..7ca0032e7ba9 100644
--- a/security/apparmor/ipc.c
+++ b/security/apparmor/ipc.c
@@ -128,7 +128,7 @@ static inline int map_signal_num(int sig)
return SIGUNKNOWN;
else if (sig >= SIGRTMIN)
return sig - SIGRTMIN + 128; /* rt sigs mapped to 128 */
- else if (sig <= MAXMAPPED_SIG)
+ else if (sig < MAXMAPPED_SIG)
return sig_map[sig];
return SIGUNKNOWN;
}
@@ -163,7 +163,7 @@ 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_SIG)
audit_log_format(ab, " signal=%s", sig_names[aad(sa)->signal]);
else
audit_log_format(ab, " signal=rtmin+%d",