diff options
| author | Alexei Starovoitov <ast@plumgrid.com> | 2015-10-07 22:23:22 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-10-12 19:13:36 -0700 |
| commit | aaac3ba95e4c8b496d22f68bd1bc01cfbf525eca (patch) | |
| tree | fa5df3122c2576bd2df76f1494c88619b22b6f08 /kernel/bpf/hashtab.c | |
| parent | 1be7f75d1668d6296b80bf35dcf6762393530afc (diff) | |
bpf: charge user for creation of BPF maps and programs
since eBPF programs and maps use kernel memory consider it 'locked' memory
from user accounting point of view and charge it against RLIMIT_MEMLOCK limit.
This limit is typically set to 64Kbytes by distros, so almost all
bpf+tracing programs would need to increase it, since they use maps,
but kernel charges maximum map size upfront.
For example the hash map of 1024 elements will be charged as 64Kbyte.
It's inconvenient for current users and changes current behavior for root,
but probably worth doing to be consistent root vs non-root.
Similar accounting logic is done by mmap of perf_event.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/hashtab.c')
| -rw-r--r-- | kernel/bpf/hashtab.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c index 83c209d9b17a..28592d79502b 100644 --- a/kernel/bpf/hashtab.c +++ b/kernel/bpf/hashtab.c @@ -88,6 +88,10 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr) htab->elem_size = sizeof(struct htab_elem) + round_up(htab->map.key_size, 8) + htab->map.value_size; + + htab->map.pages = round_up(htab->n_buckets * sizeof(struct hlist_head) + + htab->elem_size * htab->map.max_entries, + PAGE_SIZE) >> PAGE_SHIFT; return &htab->map; free_htab: |