diff options
Diffstat (limited to 'kernel/bpf/arena.c')
| -rw-r--r-- | kernel/bpf/arena.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/bpf/arena.c b/kernel/bpf/arena.c index 5b37753799d2..1074ac4459f2 100644 --- a/kernel/bpf/arena.c +++ b/kernel/bpf/arena.c @@ -633,3 +633,33 @@ static int __init kfunc_init(void) return register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC, &common_kfunc_set); } late_initcall(kfunc_init); + +void bpf_prog_report_arena_violation(bool write, unsigned long addr, unsigned long fault_ip) +{ + struct bpf_stream_stage ss; + struct bpf_prog *prog; + u64 user_vm_start; + + /* + * The RCU read lock is held to safely traverse the latch tree, but we + * don't need its protection when accessing the prog, since it will not + * disappear while we are handling the fault. + */ + rcu_read_lock(); + prog = bpf_prog_ksym_find(fault_ip); + rcu_read_unlock(); + if (!prog) + return; + + /* Use main prog for stream access */ + prog = prog->aux->main_prog_aux->prog; + + user_vm_start = bpf_arena_get_user_vm_start(prog->aux->arena); + addr += clear_lo32(user_vm_start); + + bpf_stream_stage(ss, prog, BPF_STDERR, ({ + bpf_stream_printk(ss, "ERROR: Arena %s access at unmapped address 0x%lx\n", + write ? "WRITE" : "READ", addr); + bpf_stream_dump_stack(ss); + })); +} |