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#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include "../test_kmods/bpf_testmod.h"
#include "bpf_misc.h"
char _license[] SEC("license") = "GPL";
extern void bpf_task_release(struct task_struct *p) __ksym;
__noinline int subprog_release(__u64 *ctx __arg_ctx)
{
struct task_struct *task = (struct task_struct *)ctx[1];
int dummy = (int)ctx[0];
bpf_task_release(task);
return dummy + 1;
}
/* Test that the verifier rejects a program that contains a global
* subprogram with referenced kptr arguments
*/
SEC("struct_ops/test_refcounted")
__failure __log_level(2)
__msg("Validating subprog_release() func#1...")
__msg("invalid bpf_context access off=8. Reference may already be released")
int refcounted_fail__global_subprog(unsigned long long *ctx)
{
struct task_struct *task = (struct task_struct *)ctx[1];
bpf_task_release(task);
return subprog_release(ctx);
}
SEC(".struct_ops.link")
struct bpf_testmod_ops testmod_ref_acquire = {
.test_refcounted = (void *)refcounted_fail__global_subprog,
};
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