Commit 984fe94f authored by YiFei Zhu's avatar YiFei Zhu Committed by Alexei Starovoitov
Browse files

bpf: Mutex protect used_maps array and count 



To support modifying the used_maps array, we use a mutex to protect
the use of the counter and the array. The mutex is initialized right
after the prog aux is allocated, and destroyed right before prog
aux is freed. This way we guarantee it's initialized for both cBPF
and eBPF.

Signed-off-by: default avatarYiFei Zhu <zhuyifei@google.com>
Signed-off-by: default avatarStanislav Fomichev <sdf@google.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarAndrii Nakryiko <andriin@fb.com>
Cc: YiFei Zhu <zhuyifei1999@gmail.com>
Link: https://lore.kernel.org/bpf/20200915234543.3220146-2-sdf@google.com
parent d317b0a8

drivers/net/ethernet/netronome/nfp/bpf/offload.c

+12 −6
Original line number Diff line number Diff line
@@ -111,7 +111,9 @@ static int 
nfp_map_ptrs_record(struct nfp_app_bpf *bpf, struct nfp_prog *nfp_prog,

		    struct bpf_prog *prog)

{

	int i, cnt, err;

	int i, cnt, err = 0;



	mutex_lock(&prog->aux->used_maps_mutex);



	/* Quickly count the maps we will have to remember */

	cnt = 0;
@@ -119,13 +121,15 @@ nfp_map_ptrs_record(struct nfp_app_bpf *bpf, struct nfp_prog *nfp_prog, 
		if (bpf_map_offload_neutral(prog->aux->used_maps[i]))

			cnt++;

	if (!cnt)

		return 0;

		goto out;



	nfp_prog->map_records = kmalloc_array(cnt,

					      sizeof(nfp_prog->map_records[0]),

					      GFP_KERNEL);

	if (!nfp_prog->map_records)

		return -ENOMEM;

	if (!nfp_prog->map_records) {

		err = -ENOMEM;

		goto out;

	}



	for (i = 0; i < prog->aux->used_map_cnt; i++)

		if (bpf_map_offload_neutral(prog->aux->used_maps[i])) {
@@ -133,12 +137,14 @@ nfp_map_ptrs_record(struct nfp_app_bpf *bpf, struct nfp_prog *nfp_prog, 
						 prog->aux->used_maps[i]);

			if (err) {

				nfp_map_ptrs_forget(bpf, nfp_prog);

				return err;

				goto out;

			}

		}

	WARN_ON(cnt != nfp_prog->map_records_cnt);



	return 0;

out:

	mutex_unlock(&prog->aux->used_maps_mutex);

	return err;

}



static int

include/linux/bpf.h

+1 −0
Original line number Diff line number Diff line
@@ -751,6 +751,7 @@ struct bpf_prog_aux { 
	struct bpf_ksym ksym;

	const struct bpf_prog_ops *ops;

	struct bpf_map **used_maps;

	struct mutex used_maps_mutex; /* mutex for used_maps and used_map_cnt */

	struct bpf_prog *prog;

	struct user_struct *user;

	u64 load_time; /* ns since boottime */

kernel/bpf/core.c

+11 −4
Original line number Diff line number Diff line
@@ -98,6 +98,7 @@ struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flag 
	fp->jit_requested = ebpf_jit_enabled();



	INIT_LIST_HEAD_RCU(&fp->aux->ksym.lnode);

	mutex_init(&fp->aux->used_maps_mutex);



	return fp;

}
@@ -253,6 +254,7 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, 
void __bpf_prog_free(struct bpf_prog *fp)

{

	if (fp->aux) {

		mutex_destroy(&fp->aux->used_maps_mutex);

		free_percpu(fp->aux->stats);

		kfree(fp->aux->poke_tab);

		kfree(fp->aux);
@@ -1747,8 +1749,9 @@ bool bpf_prog_array_compatible(struct bpf_array *array, 
static int bpf_check_tail_call(const struct bpf_prog *fp)

{

	struct bpf_prog_aux *aux = fp->aux;

	int i;

	int i, ret = 0;



	mutex_lock(&aux->used_maps_mutex);

	for (i = 0; i < aux->used_map_cnt; i++) {

		struct bpf_map *map = aux->used_maps[i];

		struct bpf_array *array;
@@ -1757,11 +1760,15 @@ static int bpf_check_tail_call(const struct bpf_prog *fp) 
			continue;



		array = container_of(map, struct bpf_array, map);

		if (!bpf_prog_array_compatible(array, fp))

			return -EINVAL;

		if (!bpf_prog_array_compatible(array, fp)) {

			ret = -EINVAL;

			goto out;

		}

	}



	return 0;

out:

	mutex_unlock(&aux->used_maps_mutex);

	return ret;

}



static void bpf_prog_select_func(struct bpf_prog *fp)

kernel/bpf/syscall.c

+12 −4
Original line number Diff line number Diff line
@@ -3162,21 +3162,25 @@ static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog, 
	const struct bpf_map *map;

	int i;



	mutex_lock(&prog->aux->used_maps_mutex);

	for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {

		map = prog->aux->used_maps[i];

		if (map == (void *)addr) {

			*type = BPF_PSEUDO_MAP_FD;

			return map;

			goto out;

		}

		if (!map->ops->map_direct_value_meta)

			continue;

		if (!map->ops->map_direct_value_meta(map, addr, off)) {

			*type = BPF_PSEUDO_MAP_VALUE;

			return map;

			goto out;

		}

	}

	map = NULL;



	return NULL;

out:

	mutex_unlock(&prog->aux->used_maps_mutex);

	return map;

}



static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
@@ -3294,6 +3298,7 @@ static int bpf_prog_get_info_by_fd(struct file *file, 
	memcpy(info.tag, prog->tag, sizeof(prog->tag));

	memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));



	mutex_lock(&prog->aux->used_maps_mutex);

	ulen = info.nr_map_ids;

	info.nr_map_ids = prog->aux->used_map_cnt;

	ulen = min_t(u32, info.nr_map_ids, ulen);
@@ -3303,9 +3308,12 @@ static int bpf_prog_get_info_by_fd(struct file *file, 


		for (i = 0; i < ulen; i++)

			if (put_user(prog->aux->used_maps[i]->id,

				     &user_map_ids[i]))

				     &user_map_ids[i])) {

				mutex_unlock(&prog->aux->used_maps_mutex);

				return -EFAULT;

			}

	}

	mutex_unlock(&prog->aux->used_maps_mutex);



	err = set_info_rec_size(&info);

	if (err)

net/core/dev.c

+8 −3
Original line number Diff line number Diff line
@@ -5441,17 +5441,22 @@ static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp) 
	if (new) {

		u32 i;



		mutex_lock(&new->aux->used_maps_mutex);



		/* generic XDP does not work with DEVMAPs that can

		 * have a bpf_prog installed on an entry

		 */

		for (i = 0; i < new->aux->used_map_cnt; i++) {

			if (dev_map_can_have_prog(new->aux->used_maps[i]))

				return -EINVAL;

			if (cpu_map_prog_allowed(new->aux->used_maps[i]))

			if (dev_map_can_have_prog(new->aux->used_maps[i]) ||

			    cpu_map_prog_allowed(new->aux->used_maps[i])) {

				mutex_unlock(&new->aux->used_maps_mutex);

				return -EINVAL;

			}

		}



		mutex_unlock(&new->aux->used_maps_mutex);

	}



	switch (xdp->command) {

	case XDP_SETUP_PROG:

		rcu_assign_pointer(dev->xdp_prog, new);

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