10000 feat(ebpf): make security_socket_accept not rely on sys_enter/exit by OriGlassman · Pull Request #4213 · aquasecurity/tracee · GitHub
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feat(ebpf): make security_socket_accept not rely on sys_enter/exit #4213

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Merged
merged 1 commit into from
Aug 13, 2024
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feat(ebpf): make security_socket_accept not rely on sys_enter/exit #4213

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14 changes: 9 additions & 5 deletions pkg/ebpf/c/tracee.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2682,13 +2682,14 @@ int BPF_KPROBE(trace_security_socket_accept)

struct socket *sock = (struct socket *) PT_REGS_PARM1(ctx);
struct socket *new_sock = (struct socket *) PT_REGS_PARM2(ctx);
syscall_data_t *sys = &p.task_info->syscall_data;

struct pt_regs *task_regs = get_current_task_pt_regs();

if (event_is_selected(SOCKET_ACCEPT, p.event->context.policies_version)) {
args_t args = {};
args.args[0] = (unsigned long) sock;
args.args[1] = (unsigned long) new_sock;
args.args[2] = sys->args.args[0]; // sockfd
args.args[2] = get_syscall_arg1(p.event->task, task_regs, false); // sockfd
save_args(&args, SOCKET_ACCEPT);
}

Expand All @@ -2699,14 +2700,17 @@ int BPF_KPROBE(trace_security_socket_accept)
if (!p.task_info->syscall_traced)
return 0;

switch (sys->id) {
int sockfd;
switch (p.event->context.syscall) {
case SYSCALL_ACCEPT:
case SYSCALL_ACCEPT4:
save_to_submit_buf(&p.event->args_buf, (void *) &sys->args.args[0], sizeof(u32), 0);
sockfd = get_syscall_arg1(p.event->task, task_regs, false);
save_to_submit_buf(&p.event->args_buf, (void *) &sockfd, sizeof(int), 0);
break;
#if defined(bpf_target_x86) // armhf makes use of SYSCALL_ACCEPT/4
case SYSCALL_SOCKETCALL:
save_to_submit_buf(&p.event->args_buf, (void *) sys->args.args[1], sizeof(u32), 0);
sockfd = get_syscall_arg2(p.event->task, task_regs, false);
save_to_submit_buf(&p.event->args_buf, (void *) &sockfd, sizeof(int), 0);
break;
#endif
default:
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4 changes: 0 additions & 4 deletions pkg/events/core.go
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Expand Up @@ -11646,10 +11646,6 @@ var CoreEvents = map[ID]Definition{
dependencies: Dependencies{
probes: []Probe{
{handle: probes.SecuritySocketAccept, required: true},
{handle: probes.SyscallEnter__Internal, required: true},
},
tailCalls: []TailCall{
{"sys_enter_init_tail", "sys_enter_init", []uint32{uint32(Accept), uint32(Accept4)}},
},
},
sets: []string{"default", "lsm_hooks", "net", "net_sock"},
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