On 11/07/2016 03:34 PM, Dave Jones wrote:
> I think it might be better if we wrap all of net/bpf.c in this ifdef,
> and then add additional ones wherever we call bpf_gen_filter.
> (Right now only two places iirc)
Attached is v2, that follows your suggestion.
Regards,
Jan
>From 3b98782aa7c345a6d873dbc69764340777ef8e6c Mon Sep 17 00:00:00 2001
Message-Id: <3b98782aa7c345a6d873dbc69764340777ef8e6c.1478601616.git.jstancek@xxxxxxxxxx>
From: Jan Stancek <jstancek@xxxxxxxxxx>
Date: Mon, 7 Nov 2016 12:50:27 +0100
Subject: [PATCH v2] fix build when USE_BPF is not defined
net/bpf.o: In function `bpf_gen_filter': bpf.c:852: undefined reference to `get_rand_bpf_fd'
Signed-off-by: Jan Stancek <jstancek@xxxxxxxxxx>
---
net/bpf.c | 3 +++
syscalls/bpf.c | 2 ++
syscalls/prctl.c | 4 +++-
syscalls/setsockopt.c | 2 ++
4 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/net/bpf.c b/net/bpf.c
index 4fe941733016..d6ca14bde6d3 100644
--- a/net/bpf.c
+++ b/net/bpf.c
@@ -8,6 +8,7 @@
#include <string.h>
#include "bpf.h"
+#include "config.h"
#include "debug.h"
#include "log.h"
#include "net.h"
@@ -17,6 +18,7 @@
#include "utils.h"
#include "compat.h"
+#ifdef USE_BPF
/**
* BPF filters are used in networking such as in pf_packet, but also
* in seccomp for application sand-boxing. Additionally, with arch
@@ -885,3 +887,4 @@ void bpf_gen_filter(unsigned long **addr, unsigned long *addrlen)
if (dump_bpf)
bpf_disasm_all(bpf->filter, bpf->len);
}
+#endif
diff --git a/syscalls/bpf.c b/syscalls/bpf.c
index 476a2778d8a0..372ab6dc5376 100644
--- a/syscalls/bpf.c
+++ b/syscalls/bpf.c
@@ -29,9 +29,11 @@ static void bpf_prog_load(struct syscallrecord *rec)
attr->prog_type = RAND_ARRAY(bpf_prog_types);
switch (attr->prog_type) {
+#ifdef USE_BPF
case BPF_PROG_TYPE_SOCKET_FILTER:
bpf_gen_filter(&insns, &len);
break;
+#endif
default:
// this will go away when all the other cases are enumerated
insns = zmalloc(page_size);
diff --git a/syscalls/prctl.c b/syscalls/prctl.c
index 02d2dbc6d8ab..cdbcdc217075 100644
--- a/syscalls/prctl.c
+++ b/syscalls/prctl.c
@@ -45,9 +45,11 @@ static int prctl_opts[] = {
#ifdef USE_SECCOMP
static void do_set_seccomp(struct syscallrecord *rec)
{
- unsigned long *optval = NULL, optlen = 0;
+ unsigned long *optval = NULL, __unused__ optlen = 0;
+#ifdef USE_BPF
bpf_gen_seccomp(&optval, &optlen);
+#endif
rec->a2 = SECCOMP_MODE_FILTER;
rec->a3 = (unsigned long) optval;
diff --git a/syscalls/setsockopt.c b/syscalls/setsockopt.c
index 8189b7a8ce9b..d395e54e23b9 100644
--- a/syscalls/setsockopt.c
+++ b/syscalls/setsockopt.c
@@ -48,7 +48,9 @@ static void socket_setsockopt(struct sockopt *so, __unused__ struct socket_tripl
case SO_ATTACH_FILTER: {
unsigned long *optval = NULL, optlen = 0;
+#ifdef USE_BPF
bpf_gen_filter(&optval, &optlen);
+#endif
so->optval = (unsigned long) optval;
so->optlen = optlen;
--
1.8.3.1
