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-rw-r--r--samples/bpf/bpf_helpers.h6
-rw-r--r--samples/bpf/tracex2_kern.c24
-rw-r--r--samples/bpf/tracex2_user.c67
3 files changed, 83 insertions, 14 deletions
diff --git a/samples/bpf/bpf_helpers.h b/samples/bpf/bpf_helpers.h
index f531a0b3282d..bdf1c1607b80 100644
--- a/samples/bpf/bpf_helpers.h
+++ b/samples/bpf/bpf_helpers.h
@@ -25,6 +25,12 @@ static void (*bpf_tail_call)(void *ctx, void *map, int index) =
(void *) BPF_FUNC_tail_call;
static unsigned long long (*bpf_get_smp_processor_id)(void) =
(void *) BPF_FUNC_get_smp_processor_id;
+static unsigned long long (*bpf_get_current_pid_tgid)(void) =
+ (void *) BPF_FUNC_get_current_pid_tgid;
+static unsigned long long (*bpf_get_current_uid_gid)(void) =
+ (void *) BPF_FUNC_get_current_uid_gid;
+static int (*bpf_get_current_comm)(void *buf, int buf_size) =
+ (void *) BPF_FUNC_get_current_comm;
/* llvm builtin functions that eBPF C program may use to
* emit BPF_LD_ABS and BPF_LD_IND instructions
diff --git a/samples/bpf/tracex2_kern.c b/samples/bpf/tracex2_kern.c
index 19ec1cfc45db..dc50f4f2943f 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";
diff --git a/samples/bpf/tracex2_user.c b/samples/bpf/tracex2_user.c
index 91b8d0896fbb..cd0241c1447a 100644
--- a/samples/bpf/tracex2_user.c
+++ b/samples/bpf/tracex2_user.c
@@ -3,6 +3,7 @@
#include <stdlib.h>
#include <signal.h>
#include <linux/bpf.h>
+#include <string.h>
#include "libbpf.h"
#include "bpf_load.h"
@@ -20,23 +21,42 @@ static void stars(char *str, long val, long max, int width)
str[i] = '\0';
}
-static void print_hist(int fd)
+struct task {
+ char comm[16];
+ __u64 pid_tgid;
+ __u64 uid_gid;
+};
+
+struct hist_key {
+ struct task t;
+ __u32 index;
+};
+
+#define SIZE sizeof(struct task)
+
+static void print_hist_for_pid(int fd, void *task)
{
- int key;
+ struct hist_key key = {}, next_key;
+ char starstr[MAX_STARS];
long value;
long data[MAX_INDEX] = {};
- char starstr[MAX_STARS];
- int i;
int max_ind = -1;
long max_value = 0;
+ int i, ind;
- for (key = 0; key < MAX_INDEX; key++) {
- bpf_lookup_elem(fd, &key, &value);
- data[key] = value;
- if (value && key > max_ind)
- max_ind = key;
+ while (bpf_get_next_key(fd, &key, &next_key) == 0) {
+ if (memcmp(&next_key, task, SIZE)) {
+ key = next_key;
+ continue;
+ }
+ bpf_lookup_elem(fd, &next_key, &value);
+ ind = next_key.index;
+ data[ind] = value;
+ if (value && ind > max_ind)
+ max_ind = ind;
if (value > max_value)
max_value = value;
+ key = next_key;
}
printf(" syscall write() stats\n");
@@ -48,6 +68,35 @@ static void print_hist(int fd)
MAX_STARS, starstr);
}
}
+
+static void print_hist(int fd)
+{
+ struct hist_key key = {}, next_key;
+ static struct task tasks[1024];
+ int task_cnt = 0;
+ int i;
+
+ while (bpf_get_next_key(fd, &key, &next_key) == 0) {
+ int found = 0;
+
+ for (i = 0; i < task_cnt; i++)
+ if (memcmp(&tasks[i], &next_key, SIZE) == 0)
+ found = 1;
+ if (!found)
+ memcpy(&tasks[task_cnt++], &next_key, SIZE);
+ key = next_key;
+ }
+
+ for (i = 0; i < task_cnt; i++) {
+ printf("\npid %d cmd %s uid %d\n",
+ (__u32) tasks[i].pid_tgid,
+ tasks[i].comm,
+ (__u32) tasks[i].uid_gid);
+ print_hist_for_pid(fd, &tasks[i]);
+ }
+
+}
+
static void int_exit(int sig)
{
print_hist(map_fd[1]);