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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /samples/bpf/tracex2_kern.c
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'samples/bpf/tracex2_kern.c')
-rw-r--r--samples/bpf/tracex2_kern.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/samples/bpf/tracex2_kern.c b/samples/bpf/tracex2_kern.c
index 19ec1cfc4..dc50f4f29 100644
--- a/samples/bpf/tracex2_kern.c
+++ b/samples/bpf/tracex2_kern.c
@@ -62,11 +62,18 @@ static unsigned int log2l(unsigned long v)
return log2(v);
}
+struct hist_key {
+ char comm[16];
+ u64 pid_tgid;
+ u64 uid_gid;
+ u32 index;
+};
+
struct bpf_map_def SEC("maps") my_hist_map = {
- .type = BPF_MAP_TYPE_ARRAY,
- .key_size = sizeof(u32),
+ .type = BPF_MAP_TYPE_HASH,
+ .key_size = sizeof(struct hist_key),
.value_size = sizeof(long),
- .max_entries = 64,
+ .max_entries = 1024,
};
SEC("kprobe/sys_write")
@@ -75,11 +82,18 @@ int bpf_prog3(struct pt_regs *ctx)
long write_size = ctx->dx; /* arg3 */
long init_val = 1;
long *value;
- u32 index = log2l(write_size);
+ struct hist_key key = {};
+
+ key.index = log2l(write_size);
+ key.pid_tgid = bpf_get_current_pid_tgid();
+ key.uid_gid = bpf_get_current_uid_gid();
+ bpf_get_current_comm(&key.comm, sizeof(key.comm));
- value = bpf_map_lookup_elem(&my_hist_map, &index);
+ value = bpf_map_lookup_elem(&my_hist_map, &key);
if (value)
__sync_fetch_and_add(value, 1);
+ else
+ bpf_map_update_elem(&my_hist_map, &key, &init_val, BPF_ANY);
return 0;
}
char _license[] SEC("license") = "GPL";