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capable.c
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capable.c
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// Based on: https://github.com/kinvolk/inspektor-gadget/blob/main/pkg/gadgets/capabilities/tracer/core/bpf/capable.bpf.c
// Copyright 2022 Sony Group Corporation
#include <vmlinux.h>
#include <bpf/bpf_core_read.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#define TASK_COMM_LEN 16
#define MAX_ENTRIES 10240
struct cap_event {
__u32 pid;
int cap;
__u32 tgid;
__u32 uid;
char task[TASK_COMM_LEN];
};
struct key_t {
__u32 pid;
__u32 tgid;
int user_stack_id;
int kern_stack_id;
};
struct {
__uint(type, BPF_MAP_TYPE_RINGBUF);
__uint(max_entries, 1 << 24);
__type(value, struct cap_event);
} events SEC(".maps.counter");
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__type(key, struct key_t);
__type(value, struct cap_event);
__uint(max_entries, MAX_ENTRIES);
} info SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 1024);
__uint(key_size, sizeof(u64));
__uint(value_size, sizeof(u32));
} mount_ns_set SEC(".maps");
SEC("kprobe/cap_capable")
int BPF_KPROBE(kprobe__cap_capable, const struct cred *cred, struct user_namespace *targ_ns, int cap, int cap_opt)
{
__u32 pid;
__u64 pid_tgid;
struct key_t i_key;
struct task_struct *task;
task = (struct task_struct*) bpf_get_current_task();
pid_tgid = bpf_get_current_pid_tgid();
pid = pid_tgid >> 32;
struct cap_event *event;
event = bpf_ringbuf_reserve(&events, sizeof(struct cap_event), 0);
if (!event) {
return 0;
}
event->pid = pid;
event->tgid = pid_tgid;
event->cap = cap;
event->uid = bpf_get_current_uid_gid();
bpf_get_current_comm(&event->task, sizeof(event->task));
bpf_ringbuf_submit(event, 0);
return 0;
}
char LICENSE[] SEC("license") = "GPL";