[PATCH 2/2] bpf-lsm: Make bpf_lsm_create_user_ns() sleepable

From: Frederick Lawler <fred@cloudflare.com>
To: kpsingh@kernel.org, revest@chromium.org, jackmanb@chromium.org,
	ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
	kafai@fb.com, songliubraving@fb.com, yhs@fb.com,
	john.fastabend@gmail.com, jmorris@namei.org, serge@hallyn.com,
	bpf@vger.kernel.org, linux-security-module@vger.kernel.org
Cc: brauner@kernel.org, casey@schaufler-ca.com, paul@paul-moore.com,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	kernel-team@cloudflare.com,
	Frederick Lawler <fred@cloudflare.com>
Subject: [PATCH 2/2] bpf-lsm: Make bpf_lsm_create_user_ns() sleepable
Date: Tue, 21 Jun 2022 18:39:39 -0500	[thread overview]
Message-ID: <20220621233939.993579-3-fred@cloudflare.com> (raw)
In-Reply-To: <20220621233939.993579-1-fred@cloudflare.com>

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_create_user_ns() sleepable
for mandatory access control policies.

Signed-off-by: Frederick Lawler <fred@cloudflare.com>
---
 kernel/bpf/bpf_lsm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
index c1351df9f7ee..75853965e7b0 100644
--- a/kernel/bpf/bpf_lsm.c
+++ b/kernel/bpf/bpf_lsm.c
@@ -250,6 +250,7 @@ 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_create_user_ns)
 BTF_SET_END(sleepable_lsm_hooks)
 
 bool bpf_lsm_is_sleepable_hook(u32 btf_id)
-- 
2.30.2

