[PATCH v8 bpf-next 18/18] bpf,selinux: allocate bpf_security_struct per BPF token
From: Andrii Nakryiko <andrii@kernel.org>
Date: 2023-10-16 18:03:14
Also in:
bpf, linux-fsdevel, linux-security-module
Subsystem:
selinux security module, the rest · Maintainers:
Paul Moore, Stephen Smalley, Linus Torvalds
Utilize newly added bpf_token_create/bpf_token_free LSM hooks to allocate struct bpf_security_struct for each BPF token object in SELinux. This just follows similar pattern for BPF prog and map. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> --- security/selinux/hooks.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 3d5dea4f1df0..acd84839ae2c 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c@@ -6828,6 +6828,29 @@ static void selinux_bpf_prog_free(struct bpf_prog *prog) prog->aux->security = NULL; kfree(bpfsec); } + +static int selinux_bpf_token_create(struct bpf_token *token, union bpf_attr *attr, + struct path *path) +{ + struct bpf_security_struct *bpfsec; + + bpfsec = kzalloc(sizeof(*bpfsec), GFP_KERNEL); + if (!bpfsec) + return -ENOMEM; + + bpfsec->sid = current_sid(); + token->security = bpfsec; + + return 0; +} + +static void selinux_bpf_token_free(struct bpf_token *token) +{ + struct bpf_security_struct *bpfsec = token->security; + + token->security = NULL; + kfree(bpfsec); +} #endif struct lsm_blob_sizes selinux_blob_sizes __ro_after_init = {
@@ -7183,6 +7206,7 @@ static struct security_hook_list selinux_hooks[] __ro_after_init = { LSM_HOOK_INIT(bpf_prog, selinux_bpf_prog), LSM_HOOK_INIT(bpf_map_free, selinux_bpf_map_free), LSM_HOOK_INIT(bpf_prog_free, selinux_bpf_prog_free), + LSM_HOOK_INIT(bpf_token_free, selinux_bpf_token_free), #endif #ifdef CONFIG_PERF_EVENTS
@@ -7241,6 +7265,7 @@ static struct security_hook_list selinux_hooks[] __ro_after_init = { #ifdef CONFIG_BPF_SYSCALL LSM_HOOK_INIT(bpf_map_create, selinux_bpf_map_create), LSM_HOOK_INIT(bpf_prog_load, selinux_bpf_prog_load), + LSM_HOOK_INIT(bpf_token_create, selinux_bpf_token_create), #endif #ifdef CONFIG_PERF_EVENTS LSM_HOOK_INIT(perf_event_alloc, selinux_perf_event_alloc),
--
2.34.1