seccomp: allow BPF_XOR based ALU instructions.

Allow BPF_XOR based ALU instructions.
Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Will Drewry <wad@chromium.org>
Signed-off-by: James Morris <james.l.morris@oracle.com>

kernel/seccomp.c

@@ -160,6 +160,8 @@ static int seccomp_check_filter(struct sock_filter *filter, unsigned int flen)
 		case BPF_S_ALU_AND_X:
 		case BPF_S_ALU_OR_K:
 		case BPF_S_ALU_OR_X:
+		case BPF_S_ALU_XOR_K:
+		case BPF_S_ALU_XOR_X:
 		case BPF_S_ALU_LSH_K:
 		case BPF_S_ALU_LSH_X:
 		case BPF_S_ALU_RSH_K: