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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2016-09-23 22:40:05 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-09-27 09:48:58 +0200 |
| commit | 973d94d8a87c32661f1308a118074972ac5d483a (patch) | |
| tree | 594eeceac135ae0914ac7f6995bf60cbe008ffa4 /samples | |
| parent | bpf samples: fix compiler errors with sockex2 and sockex3 (diff) | |
| download | linux-973d94d8a87c32661f1308a118074972ac5d483a.tar.xz linux-973d94d8a87c32661f1308a118074972ac5d483a.zip | |
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')
| -rw-r--r-- | samples/bpf/tracex5_kern.c | 16 | ||||
| -rw-r--r-- | samples/bpf/tracex5_user.c | 3 |
2 files changed, 10 insertions, 9 deletions
diff --git a/samples/bpf/tracex5_kern.c b/samples/bpf/tracex5_kern.c index f95f232cbab9..fd12d7154d42 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 a04dd3cd4358..36b5925bb137 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); |