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bpf: charge user for creation of BPF maps and programs

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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>
This commit is contained in:
Alexei Starovoitov 2015-10-07 22:23:22 -07:00 • committed by David S. Miller
parent 1be7f75d16
commit aaac3ba95e
5 changed files with 72 additions and 2 deletions
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3
include/linux/bpf.h
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@ -36,6 +36,8 @@ struct bpf_map {
u32 key_size;
u32 value_size;
u32 max_entries;
u32 pages;
struct user_struct *user;
const struct bpf_map_ops *ops;
struct work_struct work;
};
@ -128,6 +130,7 @@ struct bpf_prog_aux {
const struct bpf_verifier_ops *ops;
struct bpf_map **used_maps;
struct bpf_prog *prog;
struct user_struct *user;
union {
struct work_struct work;
struct rcu_head rcu;