linux-kernel - [PATCH] bpf: Drop disabled LSM hooks from the sleepable set

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Date:   Fri, 22 Jan 2021 14:30:03 +0200
From:   Mikko Ylinen <mikko.ylinen@...ux.intel.com>
To:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     kpsingh@...gle.com, daniel@...earbox.net
Subject: [PATCH] bpf: Drop disabled LSM hooks from the sleepable set

Networking LSM hooks are conditionally enabled and when building the new
sleepable BPF LSM hooks with the networking LSM hooks disabled, the
following build error occurs:

BTFIDS  vmlinux
FAILED unresolved symbol bpf_lsm_socket_socketpair

To fix the error, conditionally add the networking LSM hooks to the
sleepable set.

Fixes: 423f16108c9d8 ("bpf: Augment the set of sleepable LSM hooks")
Signed-off-by: Mikko Ylinen <mikko.ylinen@...ux.intel.com>
---
 kernel/bpf/bpf_lsm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
index 70e5e0b6d69d..5041dd35f2a6 100644
--- a/kernel/bpf/bpf_lsm.c
+++ b/kernel/bpf/bpf_lsm.c
@@ -149,7 +149,11 @@ BTF_ID(func, bpf_lsm_file_ioctl)
 BTF_ID(func, bpf_lsm_file_lock)
 BTF_ID(func, bpf_lsm_file_open)
 BTF_ID(func, bpf_lsm_file_receive)
+
+#ifdef CONFIG_SECURITY_NETWORK
 BTF_ID(func, bpf_lsm_inet_conn_established)
+#endif /* CONFIG_SECURITY_NETWORK */
+
 BTF_ID(func, bpf_lsm_inode_create)
 BTF_ID(func, bpf_lsm_inode_free_security)
 BTF_ID(func, bpf_lsm_inode_getattr)
@@ -181,6 +185,8 @@ BTF_ID(func, bpf_lsm_sb_show_options)
 BTF_ID(func, bpf_lsm_sb_statfs)
 BTF_ID(func, bpf_lsm_sb_umount)
 BTF_ID(func, bpf_lsm_settime)
+
+#ifdef CONFIG_SECURITY_NETWORK
 BTF_ID(func, bpf_lsm_socket_accept)
 BTF_ID(func, bpf_lsm_socket_bind)
 BTF_ID(func, bpf_lsm_socket_connect)
@@ -195,6 +201,8 @@ BTF_ID(func, bpf_lsm_socket_recvmsg)
 BTF_ID(func, bpf_lsm_socket_sendmsg)
 BTF_ID(func, bpf_lsm_socket_shutdown)
 BTF_ID(func, bpf_lsm_socket_socketpair)
+#endif /* CONFIG_SECURITY_NETWORK */
+
 BTF_ID(func, bpf_lsm_syslog)
 BTF_ID(func, bpf_lsm_task_alloc)
 BTF_ID(func, bpf_lsm_task_getsecid)
-- 
2.17.1