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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: cd1dbf76b2 ("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>
This commit is contained in:
John Johansen 2017-11-08 08:09:52 -08:00 committed by Linus Torvalds
parent fbc3edf7d7
commit f7dc4c9a85
1 changed files with 2 additions and 2 deletions
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4
security/apparmor/ipc.c
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@ -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",