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bpf: Expose bpf_d_path helper to sleepable LSM hooks 

Sleepable hooks are never called from an NMI/interrupt context, so it
is safe to use the bpf_d_path helper in LSM programs attaching to these
hooks.

The helper is not restricted to sleepable programs and merely uses the
list of sleepable hooks as the initial subset of LSM hooks where it can
be used.

Signed-off-by: KP Singh <kpsingh@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20201113005930.541956-3-kpsingh@chromium.org
This commit is contained in:
KP Singh 2020-11-13 00:59:30 +00:00 committed by Daniel Borkmann
parent 423f16108c
commit 6f100640ca
1 changed files with 7 additions and 1 deletions
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8
kernel/trace/bpf_trace.c
View File

@ -16,6 +16,8 @@
#include <linux/syscalls.h>
#include <linux/error-injection.h>
#include <linux/btf_ids.h>
#include <linux/bpf_lsm.h>
#include <net/bpf_sk_storage.h>
#include <uapi/linux/bpf.h>
@ -1179,7 +1181,11 @@ BTF_SET_END(btf_allowlist_d_path)
static bool bpf_d_path_allowed(const struct bpf_prog *prog)
{
return btf_id_set_contains(&btf_allowlist_d_path, prog->aux->attach_btf_id);
if (prog->type == BPF_PROG_TYPE_LSM)
return bpf_lsm_is_sleepable_hook(prog->aux->attach_btf_id);
return btf_id_set_contains(&btf_allowlist_d_path,
prog->aux->attach_btf_id);
}
BTF_ID_LIST_SINGLE(bpf_d_path_btf_ids, struct, path)