Hello all,
OpenSSL is using socket() calls (in FIPS mode) when handling ECDSA keys
in privsep child. The socket() syscall is already denied in the seccomp
filter, but in ppc64le kernel, it is implemented using socketcall()
syscall, which is not denied yet (only SYS_SHUTDOWN is allowed) and
therefore fails hard.
See attached patch with proposed patch (deny is intentionally after
allowing the SYS_SHUTDOWN). Can we have it fixed in OpenSSH portable?
Regards,
--
Jakub Jelen
Software Engineer
Security Technologies
Red Hat
diff -up openssh-7.4p1/sandbox-seccomp-filter.c.sandbox openssh-7.4p1/sandbox-seccomp-filter.c
--- openssh-7.4p1/sandbox-seccomp-filter.c.sandbox 2017-04-21 13:30:49.692650798 +0200
+++ openssh-7.4p1/sandbox-seccomp-filter.c 2017-04-21 13:30:52.259647579 +0200
@@ -215,6 +215,7 @@ static const struct sock_filter preauth_
#endif
#ifdef __NR_socketcall
SC_ALLOW_ARG(socketcall, 0, SYS_SHUTDOWN),
+ SC_DENY(socketcall, EACCES),
#endif
/* Default deny */
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