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Rust syscalls handled #1

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Rust syscalls handled #1

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bc45565
handled the system calls that are not commented out, all of the code …
DivikChotani Jun 19, 2025
efe6e07
combined match branches to remove repeating code
DivikChotani Jun 19, 2025
1a77ecb
fixed SYS_inotify_add_watch syscall to add the file path
DivikChotani Jun 19, 2025
53f09b2
checking the number of missed events per cpu per each poll to test ro…
DivikChotani Jun 23, 2025
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17 changes: 17 additions & 0 deletions Cargo.lock
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1 change: 1 addition & 0 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ clap = "4.5.39"
libbpf-rs = { version = "0.24.8", features = ["generate-test-files", "libbpf-sys", "vendored"] }
libbpf-sys = "1.5.0"
libc = "0.2.172"
num_cpus = "1.17.0"
once_cell = "1.21.3"
plain = "0.2.3"

Expand Down
37 changes: 36 additions & 1 deletion src/bpf/hs_trace.bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,12 @@ struct {
__uint(max_entries, 1024 * 1024);
} output SEC(".maps");

struct {
__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
__type(key, u32);
__type(value, u32);
__uint(max_entries, 1);
} missed_events SEC(".maps");
// struct {
// __uint(type, BPF_MAP_TYPE_HASH);
// __type(key, struct unique_file_t);
Expand Down Expand Up @@ -154,7 +160,7 @@ BPF_PROG(hs_trace_sys_enter, struct pt_regs *regs, long syscall_id)
#ifdef __NR_inotify_add_watch
case __NR_inotify_add_watch:
path = (char *)PT_REGS_PARM2_CORE(regs);
event_type = SYS_ENTER0;
event_type = SYS_ENTER1;
break;
#endif
#ifdef __NR_execve
Expand Down Expand Up @@ -289,6 +295,14 @@ BPF_PROG(hs_trace_sys_enter, struct pt_regs *regs, long syscall_id)
if (event_type == SYS_ENTER0) {
if ((enter0 = bpf_ringbuf_reserve(
&output, sizeof(struct sys_enter_info0_t), 0)) == NULL) {
bpf_printk("FAILED to reserve space in ring buffer for event_type == SYS_ENTER0\n");
bpf_printk("FAILED to reserve space in ring buffer for event_type == SYS_ENTER1\n");
u32 key = 0;
u32 *missed = bpf_map_lookup_elem(&missed_events, &key);
if(missed) {
__sync_fetch_and_add(missed, 1);
}

return 0;
}
enter0->pid = pid_tgid;
Expand All @@ -298,6 +312,13 @@ BPF_PROG(hs_trace_sys_enter, struct pt_regs *regs, long syscall_id)
} else if (event_type == SYS_ENTER1) {
if ((enter1 = bpf_ringbuf_reserve(
&output, sizeof(struct sys_enter_info1_t), 0)) == NULL) {
bpf_printk("FAILED to reserve space in ring buffer for event_type == SYS_ENTER1\n");
u32 key = 0;
u32 *missed = bpf_map_lookup_elem(&missed_events, &key);
if(missed) {
__sync_fetch_and_add(missed, 1);
}

return 0;
}
enter1->pid = pid_tgid;
Expand All @@ -309,6 +330,13 @@ BPF_PROG(hs_trace_sys_enter, struct pt_regs *regs, long syscall_id)
} else if (event_type == SYS_ENTER2) {
if ((enter2 = bpf_ringbuf_reserve(
&output, sizeof(struct sys_enter_info2_t), 0)) == NULL) {
bpf_printk("FAILED to reserve space in ring buffer for event_type == SYS_ENTER1\n");
u32 key = 0;
u32 *missed = bpf_map_lookup_elem(&missed_events, &key);
if(missed) {
__sync_fetch_and_add(missed, 1);
}

return 0;
}
enter2->pid = pid_tgid;
Expand Down Expand Up @@ -512,6 +540,13 @@ BPF_PROG(hs_trace_sys_exit, struct pt_regs *regs, long ret)
struct sys_exit_info_t *exit;
if ((exit = bpf_ringbuf_reserve(&output, sizeof(struct sys_exit_info_t),
0)) == NULL) {
bpf_printk("FAILED to reserve space in ring buffer for event_type == SYS_ENTER1\n");
u32 key = 0;
u32 *missed = bpf_map_lookup_elem(&missed_events, &key);
if(missed) {
__sync_fetch_and_add(missed, 1);
}

return 0;
}
exit->pid = pid_tgid;
Expand Down
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