https://github.com/torvalds/linux
Tip revision: 9f4ad9e425a1d3b6a34617b8ea226d56a119a717 authored by Linus Torvalds on 25 April 2021, 20:49:08 UTC
Linux 5.12
Linux 5.12
Tip revision: 9f4ad9e
bpf_task_storage.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2020 Facebook
* Copyright 2020 Google LLC.
*/
#include <linux/pid.h>
#include <linux/sched.h>
#include <linux/rculist.h>
#include <linux/list.h>
#include <linux/hash.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/bpf.h>
#include <linux/bpf_local_storage.h>
#include <linux/filter.h>
#include <uapi/linux/btf.h>
#include <linux/bpf_lsm.h>
#include <linux/btf_ids.h>
#include <linux/fdtable.h>
DEFINE_BPF_STORAGE_CACHE(task_cache);
static struct bpf_local_storage __rcu **task_storage_ptr(void *owner)
{
struct task_struct *task = owner;
struct bpf_storage_blob *bsb;
bsb = bpf_task(task);
if (!bsb)
return NULL;
return &bsb->storage;
}
static struct bpf_local_storage_data *
task_storage_lookup(struct task_struct *task, struct bpf_map *map,
bool cacheit_lockit)
{
struct bpf_local_storage *task_storage;
struct bpf_local_storage_map *smap;
struct bpf_storage_blob *bsb;
bsb = bpf_task(task);
if (!bsb)
return NULL;
task_storage = rcu_dereference(bsb->storage);
if (!task_storage)
return NULL;
smap = (struct bpf_local_storage_map *)map;
return bpf_local_storage_lookup(task_storage, smap, cacheit_lockit);
}
void bpf_task_storage_free(struct task_struct *task)
{
struct bpf_local_storage_elem *selem;
struct bpf_local_storage *local_storage;
bool free_task_storage = false;
struct bpf_storage_blob *bsb;
struct hlist_node *n;
bsb = bpf_task(task);
if (!bsb)
return;
rcu_read_lock();
local_storage = rcu_dereference(bsb->storage);
if (!local_storage) {
rcu_read_unlock();
return;
}
/* Neither the bpf_prog nor the bpf-map's syscall
* could be modifying the local_storage->list now.
* Thus, no elem can be added-to or deleted-from the
* local_storage->list by the bpf_prog or by the bpf-map's syscall.
*
* It is racing with bpf_local_storage_map_free() alone
* when unlinking elem from the local_storage->list and
* the map's bucket->list.
*/
raw_spin_lock_bh(&local_storage->lock);
hlist_for_each_entry_safe(selem, n, &local_storage->list, snode) {
/* Always unlink from map before unlinking from
* local_storage.
*/
bpf_selem_unlink_map(selem);
free_task_storage = bpf_selem_unlink_storage_nolock(
local_storage, selem, false);
}
raw_spin_unlock_bh(&local_storage->lock);
rcu_read_unlock();
/* free_task_storage should always be true as long as
* local_storage->list was non-empty.
*/
if (free_task_storage)
kfree_rcu(local_storage, rcu);
}
static void *bpf_pid_task_storage_lookup_elem(struct bpf_map *map, void *key)
{
struct bpf_local_storage_data *sdata;
struct task_struct *task;
unsigned int f_flags;
struct pid *pid;
int fd, err;
fd = *(int *)key;
pid = pidfd_get_pid(fd, &f_flags);
if (IS_ERR(pid))
return ERR_CAST(pid);
/* We should be in an RCU read side critical section, it should be safe
* to call pid_task.
*/
WARN_ON_ONCE(!rcu_read_lock_held());
task = pid_task(pid, PIDTYPE_PID);
if (!task) {
err = -ENOENT;
goto out;
}
sdata = task_storage_lookup(task, map, true);
put_pid(pid);
return sdata ? sdata->data : NULL;
out:
put_pid(pid);
return ERR_PTR(err);
}
static int bpf_pid_task_storage_update_elem(struct bpf_map *map, void *key,
void *value, u64 map_flags)
{
struct bpf_local_storage_data *sdata;
struct task_struct *task;
unsigned int f_flags;
struct pid *pid;
int fd, err;
fd = *(int *)key;
pid = pidfd_get_pid(fd, &f_flags);
if (IS_ERR(pid))
return PTR_ERR(pid);
/* We should be in an RCU read side critical section, it should be safe
* to call pid_task.
*/
WARN_ON_ONCE(!rcu_read_lock_held());
task = pid_task(pid, PIDTYPE_PID);
if (!task || !task_storage_ptr(task)) {
err = -ENOENT;
goto out;
}
sdata = bpf_local_storage_update(
task, (struct bpf_local_storage_map *)map, value, map_flags);
err = PTR_ERR_OR_ZERO(sdata);
out:
put_pid(pid);
return err;
}
static int task_storage_delete(struct task_struct *task, struct bpf_map *map)
{
struct bpf_local_storage_data *sdata;
sdata = task_storage_lookup(task, map, false);
if (!sdata)
return -ENOENT;
bpf_selem_unlink(SELEM(sdata));
return 0;
}
static int bpf_pid_task_storage_delete_elem(struct bpf_map *map, void *key)
{
struct task_struct *task;
unsigned int f_flags;
struct pid *pid;
int fd, err;
fd = *(int *)key;
pid = pidfd_get_pid(fd, &f_flags);
if (IS_ERR(pid))
return PTR_ERR(pid);
/* We should be in an RCU read side critical section, it should be safe
* to call pid_task.
*/
WARN_ON_ONCE(!rcu_read_lock_held());
task = pid_task(pid, PIDTYPE_PID);
if (!task) {
err = -ENOENT;
goto out;
}
err = task_storage_delete(task, map);
out:
put_pid(pid);
return err;
}
BPF_CALL_4(bpf_task_storage_get, struct bpf_map *, map, struct task_struct *,
task, void *, value, u64, flags)
{
struct bpf_local_storage_data *sdata;
if (flags & ~(BPF_LOCAL_STORAGE_GET_F_CREATE))
return (unsigned long)NULL;
/* explicitly check that the task_storage_ptr is not
* NULL as task_storage_lookup returns NULL in this case and
* bpf_local_storage_update expects the owner to have a
* valid storage pointer.
*/
if (!task || !task_storage_ptr(task))
return (unsigned long)NULL;
sdata = task_storage_lookup(task, map, true);
if (sdata)
return (unsigned long)sdata->data;
/* This helper must only be called from places where the lifetime of the task
* is guaranteed. Either by being refcounted or by being protected
* by an RCU read-side critical section.
*/
if (flags & BPF_LOCAL_STORAGE_GET_F_CREATE) {
sdata = bpf_local_storage_update(
task, (struct bpf_local_storage_map *)map, value,
BPF_NOEXIST);
return IS_ERR(sdata) ? (unsigned long)NULL :
(unsigned long)sdata->data;
}
return (unsigned long)NULL;
}
BPF_CALL_2(bpf_task_storage_delete, struct bpf_map *, map, struct task_struct *,
task)
{
if (!task)
return -EINVAL;
/* This helper must only be called from places where the lifetime of the task
* is guaranteed. Either by being refcounted or by being protected
* by an RCU read-side critical section.
*/
return task_storage_delete(task, map);
}
static int notsupp_get_next_key(struct bpf_map *map, void *key, void *next_key)
{
return -ENOTSUPP;
}
static struct bpf_map *task_storage_map_alloc(union bpf_attr *attr)
{
struct bpf_local_storage_map *smap;
smap = bpf_local_storage_map_alloc(attr);
if (IS_ERR(smap))
return ERR_CAST(smap);
smap->cache_idx = bpf_local_storage_cache_idx_get(&task_cache);
return &smap->map;
}
static void task_storage_map_free(struct bpf_map *map)
{
struct bpf_local_storage_map *smap;
smap = (struct bpf_local_storage_map *)map;
bpf_local_storage_cache_idx_free(&task_cache, smap->cache_idx);
bpf_local_storage_map_free(smap);
}
static int task_storage_map_btf_id;
const struct bpf_map_ops task_storage_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = bpf_local_storage_map_alloc_check,
.map_alloc = task_storage_map_alloc,
.map_free = task_storage_map_free,
.map_get_next_key = notsupp_get_next_key,
.map_lookup_elem = bpf_pid_task_storage_lookup_elem,
.map_update_elem = bpf_pid_task_storage_update_elem,
.map_delete_elem = bpf_pid_task_storage_delete_elem,
.map_check_btf = bpf_local_storage_map_check_btf,
.map_btf_name = "bpf_local_storage_map",
.map_btf_id = &task_storage_map_btf_id,
.map_owner_storage_ptr = task_storage_ptr,
};
BTF_ID_LIST_SINGLE(bpf_task_storage_btf_ids, struct, task_struct)
const struct bpf_func_proto bpf_task_storage_get_proto = {
.func = bpf_task_storage_get,
.gpl_only = false,
.ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_BTF_ID,
.arg2_btf_id = &bpf_task_storage_btf_ids[0],
.arg3_type = ARG_PTR_TO_MAP_VALUE_OR_NULL,
.arg4_type = ARG_ANYTHING,
};
const struct bpf_func_proto bpf_task_storage_delete_proto = {
.func = bpf_task_storage_delete,
.gpl_only = false,
.ret_type = RET_INTEGER,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_BTF_ID,
.arg2_btf_id = &bpf_task_storage_btf_ids[0],
};