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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2016-09-24 02:10:05 +0530
committerDavid S. Miller <davem@davemloft.net>2016-09-27 03:48:58 -0400
commit973d94d8a87c32661f1308a118074972ac5d483a (patch)
tree594eeceac135ae0914ac7f6995bf60cbe008ffa4 /samples/bpf
parent2b064fff8527a1052c7060c65c22cae80a9343b9 (diff)
downloadop-kernel-dev-973d94d8a87c32661f1308a118074972ac5d483a.zip
op-kernel-dev-973d94d8a87c32661f1308a118074972ac5d483a.tar.gz
bpf samples: update tracex5 sample to use __seccomp_filter
seccomp_phase1() does not exist anymore. Instead, update sample to use __seccomp_filter(). While at it, set max locked memory to unlimited. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples/bpf')
-rw-r--r--samples/bpf/tracex5_kern.c16
-rw-r--r--samples/bpf/tracex5_user.c3
2 files changed, 10 insertions, 9 deletions
diff --git a/samples/bpf/tracex5_kern.c b/samples/bpf/tracex5_kern.c
index f95f232..fd12d71 100644
--- a/samples/bpf/tracex5_kern.c
+++ b/samples/bpf/tracex5_kern.c
@@ -19,20 +19,18 @@ struct bpf_map_def SEC("maps") progs = {
.max_entries = 1024,
};
-SEC("kprobe/seccomp_phase1")
+SEC("kprobe/__seccomp_filter")
int bpf_prog1(struct pt_regs *ctx)
{
- struct seccomp_data sd;
-
- bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM1(ctx));
+ int sc_nr = (int)PT_REGS_PARM1(ctx);
/* dispatch into next BPF program depending on syscall number */
- bpf_tail_call(ctx, &progs, sd.nr);
+ bpf_tail_call(ctx, &progs, sc_nr);
/* fall through -> unknown syscall */
- if (sd.nr >= __NR_getuid && sd.nr <= __NR_getsid) {
+ if (sc_nr >= __NR_getuid && sc_nr <= __NR_getsid) {
char fmt[] = "syscall=%d (one of get/set uid/pid/gid)\n";
- bpf_trace_printk(fmt, sizeof(fmt), sd.nr);
+ bpf_trace_printk(fmt, sizeof(fmt), sc_nr);
}
return 0;
}
@@ -42,7 +40,7 @@ PROG(__NR_write)(struct pt_regs *ctx)
{
struct seccomp_data sd;
- bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM1(ctx));
+ bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
if (sd.args[2] == 512) {
char fmt[] = "write(fd=%d, buf=%p, size=%d)\n";
bpf_trace_printk(fmt, sizeof(fmt),
@@ -55,7 +53,7 @@ PROG(__NR_read)(struct pt_regs *ctx)
{
struct seccomp_data sd;
- bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM1(ctx));
+ bpf_probe_read(&sd, sizeof(sd), (void *)PT_REGS_PARM2(ctx));
if (sd.args[2] > 128 && sd.args[2] <= 1024) {
char fmt[] = "read(fd=%d, buf=%p, size=%d)\n";
bpf_trace_printk(fmt, sizeof(fmt),
diff --git a/samples/bpf/tracex5_user.c b/samples/bpf/tracex5_user.c
index a04dd3c..36b5925 100644
--- a/samples/bpf/tracex5_user.c
+++ b/samples/bpf/tracex5_user.c
@@ -6,6 +6,7 @@
#include <sys/prctl.h>
#include "libbpf.h"
#include "bpf_load.h"
+#include <sys/resource.h>
/* install fake seccomp program to enable seccomp code path inside the kernel,
* so that our kprobe attached to seccomp_phase1() can be triggered
@@ -27,8 +28,10 @@ int main(int ac, char **argv)
{
FILE *f;
char filename[256];
+ struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
+ setrlimit(RLIMIT_MEMLOCK, &r);
if (load_bpf_file(filename)) {
printf("%s", bpf_log_buf);
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