From: Frederick Lawler <fred@cloudflare.com>
Date: Mon, 15 Aug 2022 16:20:26 +0000 (-0500)
Subject: bpf-lsm: Make bpf_lsm_userns_create() sleepable
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=401e64b3a4af4c7a2f6a00337232a3cf0bb757ed;p=linux.git

bpf-lsm: Make bpf_lsm_userns_create() sleepable

Users may want to audit calls to security_create_user_ns() and access
user space memory. Also create_user_ns() runs without
pagefault_disabled(). Therefore, make bpf_lsm_userns_create() sleepable
for mandatory access control policies.

Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Acked-by: KP Singh <kpsingh@kernel.org>
Signed-off-by: Frederick Lawler <fred@cloudflare.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
---

diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
index fa71d58b7deda..761998fda7626 100644
--- a/kernel/bpf/bpf_lsm.c
+++ b/kernel/bpf/bpf_lsm.c
@@ -335,6 +335,7 @@ BTF_ID(func, bpf_lsm_task_getsecid_obj)
 BTF_ID(func, bpf_lsm_task_prctl)
 BTF_ID(func, bpf_lsm_task_setscheduler)
 BTF_ID(func, bpf_lsm_task_to_inode)
+BTF_ID(func, bpf_lsm_userns_create)
 BTF_SET_END(sleepable_lsm_hooks)
 
 bool bpf_lsm_is_sleepable_hook(u32 btf_id)