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diff -r ed17ce89119f src/nxt_capability.c
--- a/src/nxt_capability.c Fri Dec 06 17:02:23 2019 +0000
+++ b/src/nxt_capability.c Mon Dec 09 23:23:00 2019 +0000
@@ -93,6 +93,26 @@ nxt_capability_specific_set(nxt_task_t *
return NXT_OK;
}
+
+nxt_int_t
+nxt_capability_drop_all(nxt_task_t *task)
+{
+ struct __user_cap_header_struct hdr;
+ struct __user_cap_data_struct data[2];
+
+ hdr.version = nxt_capability_linux_get_version();
+ hdr.pid = nxt_pid;
+
+ nxt_memset(data, 0, sizeof(data));
+
+ if (nxt_slow_path(nxt_capset(&hdr, data) == -1)) {
+ nxt_alert(task, "failed to drop capabilities %E", nxt_errno);
+ return NXT_ERROR;
+ }
+
+ return NXT_OK;
+}
+
#else
static nxt_int_t
diff -r ed17ce89119f src/nxt_capability.h
--- a/src/nxt_capability.h Fri Dec 06 17:02:23 2019 +0000
+++ b/src/nxt_capability.h Mon Dec 09 23:23:00 2019 +0000
@@ -14,4 +14,6 @@ typedef struct {
NXT_EXPORT nxt_int_t nxt_capability_set(nxt_task_t *task,
nxt_capabilities_t *cap);
+NXT_EXPORT nxt_int_t nxt_capability_drop_all(nxt_task_t *task);
+
#endif /* _NXT_CAPABILITY_INCLUDED_ */
diff -r ed17ce89119f src/nxt_process.c
--- a/src/nxt_process.c Fri Dec 06 17:02:23 2019 +0000
+++ b/src/nxt_process.c Mon Dec 09 23:23:00 2019 +0000
@@ -264,7 +264,7 @@ cleanup:
static void
nxt_process_start(nxt_task_t *task, nxt_process_t *process)
{
- nxt_int_t ret, cap_setid;
+ nxt_int_t ret, cap_setid, drop_caps;
nxt_port_t *port, *main_port;
nxt_thread_t *thread;
nxt_runtime_t *rt;
@@ -285,9 +285,12 @@ nxt_process_start(nxt_task_t *task, nxt_
cap_setid = rt->capabilities.setid;
+ drop_caps = cap_setid;
+
#if (NXT_HAVE_CLONE_NEWUSER)
- if (!cap_setid && NXT_CLONE_USER(init->isolation.clone.flags)) {
+ if (NXT_CLONE_USER(init->isolation.clone.flags)) {
cap_setid = 1;
+ drop_caps = 0;
}
#endif
@@ -301,6 +304,12 @@ nxt_process_start(nxt_task_t *task, nxt_
if (nxt_slow_path(ret != NXT_OK)) {
goto fail;
}
+
+#if (NXT_HAVE_LINUX_CAPABILITY)
+ if (drop_caps && nxt_capability_drop_all(task) != NXT_OK) {
+ goto fail;
+ }
+#endif
}
rt->type = init->type;
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