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bpf: Do not allow map_freeze in struct_ops map
author
Martin KaFai Lau
<kafai@fb.com>
Thu, 5 Mar 2020 01:34:54 +0000
(17:34 -0800)
committer
Alexei Starovoitov
<ast@kernel.org>
Thu, 5 Mar 2020 22:15:49 +0000
(14:15 -0800)
struct_ops map cannot support map_freeze. Otherwise, a struct_ops
cannot be unregistered from the subsystem.
Fixes:
85d33df357b6
("bpf: Introduce BPF_MAP_TYPE_STRUCT_OPS")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link:
https://lore.kernel.org/bpf/20200305013454.535397-1-kafai@fb.com
kernel/bpf/syscall.c
patch
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diff --git
a/kernel/bpf/syscall.c
b/kernel/bpf/syscall.c
index
a91ad51
..
0c7fb0d
100644
(file)
--- a/
kernel/bpf/syscall.c
+++ b/
kernel/bpf/syscall.c
@@
-1510,6
+1510,11
@@
static int map_freeze(const union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
+ if (map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
+ fdput(f);
+ return -ENOTSUPP;
+ }
+
mutex_lock(&map->freeze_mutex);
if (map->writecnt) {