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authorAlexei Starovoitov <ast@plumgrid.com>2015-10-07 22:23:22 -0700
committerDavid S. Miller <davem@davemloft.net>2015-10-12 19:13:36 -0700
commitaaac3ba95e4c8b496d22f68bd1bc01cfbf525eca (patch)
treefa5df3122c2576bd2df76f1494c88619b22b6f08 /kernel/bpf/arraymap.c
parent1be7f75d1668d6296b80bf35dcf6762393530afc (diff)
downloadlinux-sh-aaac3ba95e4c8b496d22f68bd1bc01cfbf525eca.tar.gz
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/arraymap.c')
-rw-r--r--kernel/bpf/arraymap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index 2fecc4aed119..f2d9e698c753 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -49,7 +49,7 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
array->map.key_size = attr->key_size;
array->map.value_size = attr->value_size;
array->map.max_entries = attr->max_entries;
-
+ array->map.pages = round_up(array_size, PAGE_SIZE) >> PAGE_SHIFT;
array->elem_size = elem_size;
return &array->map;