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authorKP Singh <kpsingh@google.com>2020-11-13 00:59:29 +0000
committerDaniel Borkmann <daniel@iogearbox.net>2020-11-13 15:45:54 +0100
commit423f16108c9d832bd96059d5c882c8ef6d76eb96 (patch)
tree16ffedcef30b76f5c4b93636106581cbcad4b452 /include/linux/bpf_lsm.h
parent904709f63b893b275a6d84654b47b0f81b3ca38e (diff)
bpf: Augment the set of sleepable LSM hooks
Update the set of sleepable hooks with the ones that do not trigger a warning with might_fault() when exercised with the correct kernel config options enabled, i.e. DEBUG_ATOMIC_SLEEP=y LOCKDEP=y PROVE_LOCKING=y This means that a sleepable LSM eBPF program can be attached to these LSM hooks. A new helper method bpf_lsm_is_sleepable_hook is added and the set is maintained locally in bpf_lsm.c Signed-off-by: KP Singh <kpsingh@google.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20201113005930.541956-2-kpsingh@chromium.org
Diffstat (limited to 'include/linux/bpf_lsm.h')
-rw-r--r--include/linux/bpf_lsm.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/bpf_lsm.h b/include/linux/bpf_lsm.h
index 73226181b744..0d1c33ace398 100644
--- a/include/linux/bpf_lsm.h
+++ b/include/linux/bpf_lsm.h
@@ -27,6 +27,8 @@ extern struct lsm_blob_sizes bpf_lsm_blob_sizes;
int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
const struct bpf_prog *prog);
+bool bpf_lsm_is_sleepable_hook(u32 btf_id);
+
static inline struct bpf_storage_blob *bpf_inode(
const struct inode *inode)
{
@@ -54,6 +56,11 @@ void bpf_task_storage_free(struct task_struct *task);
#else /* !CONFIG_BPF_LSM */
+static inline bool bpf_lsm_is_sleepable_hook(u32 btf_id)
+{
+ return false;
+}
+
static inline int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
const struct bpf_prog *prog)
{