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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,
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        eparis@parisplace.org, shuah@kernel.org, brauner@kernel.org,
        casey@schaufler-ca.com, ebiederm@xmission.com, bpf@vger.kernel.org,
        linux-security-module@vger.kernel.org, selinux@vger.kernel.org,
        linux-kselftest@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        kernel-team@cloudflare.com, Frederick Lawler <fred@cloudflare.com>
Subject: [PATCH v2 2/4] bpf-lsm: Make bpf_lsm_create_user_ns() sleepable
Date:   Thu,  7 Jul 2022 17:32:26 -0500
Message-Id: <20220707223228.1940249-3-fred@cloudflare.com>
In-Reply-To: <20220707223228.1940249-1-fred@cloudflare.com>
References: <20220707223228.1940249-1-fred@cloudflare.com>
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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>

---
Changes since v1:
- None
---
 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