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[v11,bpf-next,17/17] bpf,selinux: allocate bpf_security_struct per BPF token

Message ID 20231127190409.2344550-18-andrii@kernel.org (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series BPF token and BPF FS-based delegation | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/codegen success Generated files up to date
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1119 this patch: 1119
netdev/cc_maintainers warning 3 maintainers not CCed: stephen.smalley.work@gmail.com eparis@parisplace.org selinux@vger.kernel.org
netdev/build_clang success Errors and warnings before: 1143 this patch: 1143
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1146 this patch: 1146
netdev/checkpatch warning WARNING: line length of 82 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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Commit Message

Andrii Nakryiko Nov. 27, 2023, 7:04 p.m. UTC 
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 mbox series

Patch

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 002351ab67b7..1501e95366a1 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),