bpf: fix refcnt overflow

[ Upstream commit 92117d8443bc5afacc8d5ba82e541946310f106e ]

On a system with >32Gbyte of phyiscal memory and infinite RLIMIT_MEMLOCK,
the malicious application may overflow 32-bit bpf program refcnt.
It's also possible to overflow map refcnt on 1Tb system.
Impose 32k hard limit which means that the same bpf program or
map cannot be shared by more than 32k processes.

Fixes: 1be7f75d1668 ("bpf: enable non-root eBPF programs")
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 83d1926c61e4567b881bfbc26b75b802c428cbc3..67bc2da5d2336b7c7c77cb18069b514f2e4b1239 100644 (file)
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -165,12 +165,13 @@ void bpf_register_prog_type(struct bpf_prog_type_list *tl);
 void bpf_register_map_type(struct bpf_map_type_list *tl);
 
 struct bpf_prog *bpf_prog_get(u32 ufd);
+struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog);
 void bpf_prog_put(struct bpf_prog *prog);
 void bpf_prog_put_rcu(struct bpf_prog *prog);
 
 struct bpf_map *bpf_map_get_with_uref(u32 ufd);
 struct bpf_map *__bpf_map_get(struct fd f);
-void bpf_map_inc(struct bpf_map *map, bool uref);
+struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref);
 void bpf_map_put_with_uref(struct bpf_map *map);
 void bpf_map_put(struct bpf_map *map);
 

diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 5a8a797d50b74a8bb698760856c1849ff9bcc084..d1a7646f79c5a165b3faba4beee1371e7a37cf38 100644 (file)
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -31,10 +31,10 @@ static void *bpf_any_get(void *raw, enum bpf_type type)
 {
        switch (type) {
        case BPF_TYPE_PROG:
-               atomic_inc(&((struct bpf_prog *)raw)->aux->refcnt);
+               raw = bpf_prog_inc(raw);
                break;
        case BPF_TYPE_MAP:
-               bpf_map_inc(raw, true);
+               raw = bpf_map_inc(raw, true);
                break;
        default:
                WARN_ON_ONCE(1);
@@ -277,7 +277,8 @@ static void *bpf_obj_do_get(const struct filename *pathname,
                goto out;
 
        raw = bpf_any_get(inode->i_private, *type);
-       touch_atime(&path);
+       if (!IS_ERR(raw))
+               touch_atime(&path);
 
        path_put(&path);
        return raw;

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 3b39550d84856494d43aefe926457add41d2a435..4e32cc94edd92ca06da16a47d43b184e39f46598 100644 (file)
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -181,11 +181,18 @@ struct bpf_map *__bpf_map_get(struct fd f)
        return f.file->private_data;
 }
 
-void bpf_map_inc(struct bpf_map *map, bool uref)
+/* prog's and map's refcnt limit */
+#define BPF_MAX_REFCNT 32768
+
+struct bpf_map *bpf_map_inc(struct bpf_map *map, bool uref)
 {
-       atomic_inc(&map->refcnt);
+       if (atomic_inc_return(&map->refcnt) > BPF_MAX_REFCNT) {
+               atomic_dec(&map->refcnt);
+               return ERR_PTR(-EBUSY);
+       }
        if (uref)
                atomic_inc(&map->usercnt);
+       return map;
 }
 
 struct bpf_map *bpf_map_get_with_uref(u32 ufd)
@@ -197,7 +204,7 @@ struct bpf_map *bpf_map_get_with_uref(u32 ufd)
        if (IS_ERR(map))
                return map;
 
-       bpf_map_inc(map, true);
+       map = bpf_map_inc(map, true);
        fdput(f);
 
        return map;
@@ -580,6 +587,15 @@ static struct bpf_prog *__bpf_prog_get(struct fd f)
        return f.file->private_data;
 }
 
+struct bpf_prog *bpf_prog_inc(struct bpf_prog *prog)
+{
+       if (atomic_inc_return(&prog->aux->refcnt) > BPF_MAX_REFCNT) {
+               atomic_dec(&prog->aux->refcnt);
+               return ERR_PTR(-EBUSY);
+       }
+       return prog;
+}
+
 /* called by sockets/tracing/seccomp before attaching program to an event
  * pairs with bpf_prog_put()
  */
@@ -592,7 +608,7 @@ struct bpf_prog *bpf_prog_get(u32 ufd)
        if (IS_ERR(prog))
                return prog;
 
-       atomic_inc(&prog->aux->refcnt);
+       prog = bpf_prog_inc(prog);
        fdput(f);
 
        return prog;

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index e3798cf7f49d38350486cfe38d6638e20a84edca..5a615c18800146e2535e1a0024ebe68797cd0916 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -2023,15 +2023,18 @@ static int replace_map_fd_with_map_ptr(struct verifier_env *env)
                                return -E2BIG;
                        }
 
-                       /* remember this map */
-                       env->used_maps[env->used_map_cnt++] = map;
-
                        /* hold the map. If the program is rejected by verifier,
                         * the map will be released by release_maps() or it
                         * will be used by the valid program until it's unloaded
                         * and all maps are released in free_bpf_prog_info()
                         */
-                       bpf_map_inc(map, false);
+                       map = bpf_map_inc(map, false);
+                       if (IS_ERR(map)) {
+                               fdput(f);
+                               return PTR_ERR(map);
+                       }
+                       env->used_maps[env->used_map_cnt++] = map;
+
                        fdput(f);
 next_insn:
                        insn++;