Skip to content

tools/killsnoop: migrate to tracepoints #5546

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
ekyooo merged 3 commits into from
Aug 27, 2026
+37 −8
Merged

tools/killsnoop: migrate to tracepoints #5546

Changes from 1 commit
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
4f824a9
tools/killsnoop: migrate to tracepoints
invalid-email-address Aug 21, 2026
0ec0cd6
Clean up killsnoop.py by removing extra semicolon
codebyangelo Aug 27, 2026
0904795
Update kernel version requirement for test_killsnoop
codebyangelo Aug 27, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
45 changes: 38 additions & 7 deletions tools/killsnoop.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,8 @@
BPF_HASH(infotmp, u32, struct val_t);
BPF_PERF_OUTPUT(events);

int syscall__kill(struct pt_regs *ctx, int tpid, int sig)

static int probe_entry(u32 tpid, int sig)
{
u64 pid_tgid = bpf_get_current_pid_tgid();
u32 pid = pid_tgid >> 32;
Expand All @@ -85,9 +86,24 @@
}

return 0;
};
}

TRACEPOINT_PROBE(syscalls, sys_enter_kill)

@ekyooo ekyooo Aug 27, 2026

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

TRACEPOINT_PROBE-based BPF programs require Linux 4.7 or later. Please update the test_killsnoop() kernel gate from 4.4 to 4.7, consistent with the existing tracepoint tests.

for example,

--- a/tests/python/test_tools_smoke.py
+++ b/tests/python/test_tools_smoke.py
@@
-    @skipUnless(kernel_version_ge(4,4), "requires kernel >= 4.4")
+    @skipUnless(kernel_version_ge(4,7), "requires kernel >= 4.7")

{
return probe_entry(args->pid, args->sig);
}

TRACEPOINT_PROBE(syscalls, sys_enter_tkill)
{
return probe_entry(args->pid, args->sig);
}

TRACEPOINT_PROBE(syscalls, sys_enter_tgkill)
{
return probe_entry(args->pid, args->sig);
}

int do_ret_sys_kill(struct pt_regs *ctx)
static int probe_exit(void *ctx, int ret)
{
struct data_t data = {};
struct val_t *valp;
Expand All @@ -104,14 +120,32 @@
bpf_probe_read_kernel(&data.comm, sizeof(data.comm), valp->comm);
data.pid = pid;
data.tpid = valp->tpid;
data.ret = PT_REGS_RC(ctx);
data.ret = ret;
data.sig = valp->sig;

events.perf_submit(ctx, &data, sizeof(data));
infotmp.delete(&tid);

return 0;
}

TRACEPOINT_PROBE(syscalls, sys_exit_kill)
{
return probe_exit(args, args->ret);
}

TRACEPOINT_PROBE(syscalls, sys_exit_tkill)
{
return probe_exit(args, args->ret);
}

TRACEPOINT_PROBE(syscalls, sys_exit_tgkill)
{
return probe_exit(args, args->ret);
}
;

@ekyooo ekyooo Aug 27, 2026

Copy link
Copy Markdown
Collaborator

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please remove the extra blank lines and semicolon.

@codebyangelo codebyangelo Aug 27, 2026

Copy link
Copy Markdown
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thank you for the guidance. Done.



"""

if args.tpid:
Expand Down Expand Up @@ -141,9 +175,6 @@

# initialize BPF
b = BPF(text=bpf_text)
kill_fnname = b.get_syscall_fnname("kill")
b.attach_kprobe(event=kill_fnname, fn_name="syscall__kill")
b.attach_kretprobe(event=kill_fnname, fn_name="do_ret_sys_kill")

# detect the length of PID column
pid_bytes = 6
Expand Down