[PATCH bpf-next 11/13] ipe: add BPF program signature properties
KP Singh
kpsingh at kernel.org
Fri May 22 02:32:31 UTC 2026
Wire IPE to the BPF signing verdict stored in prog->aux->sig before
security_bpf_prog_load fires. Add three properties on a new IPE op
BPF_PROG_LOAD:
bpf_signature= UNSIGNED | OK | METADATA_VERIFIED
bpf_keyring= BUILTIN | SECONDARY | PLATFORM | USER
bpf_kernel= TRUE | FALSE
Example policy:
op=BPF_PROG_LOAD bpf_signature=UNSIGNED action=DENY
op=BPF_PROG_LOAD bpf_signature=OK action=ALLOW
Gated by CONFIG_IPE_PROP_BPF_SIGNATURE (depends on BPF_SYSCALL).
Signed-off-by: KP Singh <kpsingh at kernel.org>
---
security/ipe/Kconfig | 14 +++++++++
security/ipe/audit.c | 11 +++++++
security/ipe/eval.c | 57 ++++++++++++++++++++++++++++++++++++
security/ipe/eval.h | 5 ++++
security/ipe/hooks.c | 36 +++++++++++++++++++++++
security/ipe/hooks.h | 7 +++++
security/ipe/ipe.c | 3 ++
security/ipe/policy.h | 10 +++++++
security/ipe/policy_parser.c | 19 ++++++++++++
9 files changed, 162 insertions(+)
diff --git a/security/ipe/Kconfig b/security/ipe/Kconfig
index a110a6cd848b..204517c60a34 100644
--- a/security/ipe/Kconfig
+++ b/security/ipe/Kconfig
@@ -13,6 +13,7 @@ menuconfig SECURITY_IPE
select IPE_PROP_DM_VERITY_SIGNATURE if DM_VERITY && DM_VERITY_VERIFY_ROOTHASH_SIG
select IPE_PROP_FS_VERITY if FS_VERITY
select IPE_PROP_FS_VERITY_BUILTIN_SIG if FS_VERITY && FS_VERITY_BUILTIN_SIGNATURES
+ select IPE_PROP_BPF_SIGNATURE if BPF_SYSCALL
help
This option enables the Integrity Policy Enforcement LSM
allowing users to define a policy to enforce a trust-based access
@@ -95,6 +96,19 @@ config IPE_PROP_FS_VERITY_BUILTIN_SIG
if unsure, answer Y.
+config IPE_PROP_BPF_SIGNATURE
+ bool "Enable support for BPF program signature verdicts"
+ depends on BPF_SYSCALL
+ help
+ This option enables the 'bpf_signature', 'bpf_keyring' and
+ 'bpf_kernel' properties within IPE policies. The properties
+ These allow
+ policy rules to gate BPF program loads based on the loader's
+ signature verdict, the keyring used for verification, and
+ whether the load originated in kernel mode.
+
+ if unsure, answer Y.
+
endmenu
config SECURITY_IPE_KUNIT_TEST
diff --git a/security/ipe/audit.c b/security/ipe/audit.c
index 93fb59fbddd6..fec98c396d49 100644
--- a/security/ipe/audit.c
+++ b/security/ipe/audit.c
@@ -41,6 +41,7 @@ static const char *const audit_op_names[__IPE_OP_MAX + 1] = {
"KEXEC_INITRAMFS",
"POLICY",
"X509_CERT",
+ "BPF_PROG_LOAD",
"UNKNOWN",
};
@@ -51,6 +52,7 @@ static const char *const audit_hook_names[__IPE_HOOK_MAX] = {
"MPROTECT",
"KERNEL_READ",
"KERNEL_LOAD",
+ "BPF_PROG_LOAD",
};
static const char *const audit_prop_names[__IPE_PROP_MAX] = {
@@ -62,6 +64,15 @@ static const char *const audit_prop_names[__IPE_PROP_MAX] = {
"fsverity_digest=",
"fsverity_signature=FALSE",
"fsverity_signature=TRUE",
+ "bpf_signature=UNSIGNED",
+ "bpf_signature=OK",
+ "bpf_signature=METADATA_VERIFIED",
+ "bpf_keyring=BUILTIN",
+ "bpf_keyring=SECONDARY",
+ "bpf_keyring=PLATFORM",
+ "bpf_keyring=USER",
+ "bpf_kernel=FALSE",
+ "bpf_kernel=TRUE",
};
/**
diff --git a/security/ipe/eval.c b/security/ipe/eval.c
index 21439c5be336..e4b4e3723fc8 100644
--- a/security/ipe/eval.c
+++ b/security/ipe/eval.c
@@ -11,6 +11,7 @@
#include <linux/rcupdate.h>
#include <linux/moduleparam.h>
#include <linux/fsverity.h>
+#include <linux/bpf.h>
#include "ipe.h"
#include "eval.h"
@@ -265,6 +266,44 @@ static bool evaluate_fsv_sig_true(const struct ipe_eval_ctx *const ctx)
}
#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
+#ifdef CONFIG_IPE_PROP_BPF_SIGNATURE
+static bool evaluate_bpf_verdict(const struct ipe_eval_ctx *const ctx,
+ enum bpf_sig_verdict expected)
+{
+ return ctx->bpf_verdict == expected;
+}
+
+static bool evaluate_bpf_keyring(const struct ipe_eval_ctx *const ctx,
+ enum bpf_sig_keyring expected)
+{
+ return ctx->bpf_keyring == expected;
+}
+
+static bool evaluate_bpf_kernel(const struct ipe_eval_ctx *const ctx,
+ bool expected)
+{
+ return ctx->bpf_kernel == expected;
+}
+#else
+static bool evaluate_bpf_verdict(const struct ipe_eval_ctx *const ctx,
+ enum bpf_sig_verdict expected)
+{
+ return false;
+}
+
+static bool evaluate_bpf_keyring(const struct ipe_eval_ctx *const ctx,
+ enum bpf_sig_keyring expected)
+{
+ return false;
+}
+
+static bool evaluate_bpf_kernel(const struct ipe_eval_ctx *const ctx,
+ bool expected)
+{
+ return false;
+}
+#endif /* CONFIG_IPE_PROP_BPF_SIGNATURE */
+
/**
* evaluate_property() - Analyze @ctx against a rule property.
* @ctx: Supplies a pointer to the context to be evaluated.
@@ -297,6 +336,24 @@ static bool evaluate_property(const struct ipe_eval_ctx *const ctx,
return evaluate_fsv_sig_false(ctx);
case IPE_PROP_FSV_SIG_TRUE:
return evaluate_fsv_sig_true(ctx);
+ case IPE_PROP_BPF_SIG_UNSIGNED:
+ return evaluate_bpf_verdict(ctx, BPF_SIG_UNSIGNED);
+ case IPE_PROP_BPF_SIG_OK:
+ return evaluate_bpf_verdict(ctx, BPF_SIG_OK);
+ case IPE_PROP_BPF_SIG_METADATA_VERIFIED:
+ return evaluate_bpf_verdict(ctx, BPF_SIG_METADATA_VERIFIED);
+ case IPE_PROP_BPF_KEYRING_BUILTIN:
+ return evaluate_bpf_keyring(ctx, BPF_SIG_KEYRING_BUILTIN);
+ case IPE_PROP_BPF_KEYRING_SECONDARY:
+ return evaluate_bpf_keyring(ctx, BPF_SIG_KEYRING_SECONDARY);
+ case IPE_PROP_BPF_KEYRING_PLATFORM:
+ return evaluate_bpf_keyring(ctx, BPF_SIG_KEYRING_PLATFORM);
+ case IPE_PROP_BPF_KEYRING_USER:
+ return evaluate_bpf_keyring(ctx, BPF_SIG_KEYRING_USER);
+ case IPE_PROP_BPF_KERNEL_FALSE:
+ return evaluate_bpf_kernel(ctx, false);
+ case IPE_PROP_BPF_KERNEL_TRUE:
+ return evaluate_bpf_kernel(ctx, true);
default:
return false;
}
diff --git a/security/ipe/eval.h b/security/ipe/eval.h
index fef65a36468c..2ddf89695818 100644
--- a/security/ipe/eval.h
+++ b/security/ipe/eval.h
@@ -52,6 +52,11 @@ struct ipe_eval_ctx {
#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
const struct ipe_inode *ipe_inode;
#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
+#ifdef CONFIG_IPE_PROP_BPF_SIGNATURE
+ u8 bpf_verdict; /* enum bpf_sig_verdict */
+ u8 bpf_keyring; /* enum bpf_sig_keyring */
+ bool bpf_kernel;
+#endif /* CONFIG_IPE_PROP_BPF_SIGNATURE */
};
enum ipe_match {
diff --git a/security/ipe/hooks.c b/security/ipe/hooks.c
index 0ae54a880405..bdc1b634bb08 100644
--- a/security/ipe/hooks.c
+++ b/security/ipe/hooks.c
@@ -312,6 +312,42 @@ int ipe_bdev_setintegrity(struct block_device *bdev, enum lsm_integrity_type typ
}
#endif /* CONFIG_IPE_PROP_DM_VERITY */
+#ifdef CONFIG_IPE_PROP_BPF_SIGNATURE
+/**
+ * ipe_bpf_prog_load() - IPE hook for BPF program load.
+ * @prog: The BPF program being loaded.
+ * @attr: BPF syscall attributes.
+ * @token: BPF token.
+ * @kernel: Whether the load originated in kernel mode.
+ *
+ * Return: %0 on success, %-EACCES if denied by policy.
+ */
+int ipe_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
+ struct bpf_token *token, bool kernel)
+{
+ struct ipe_eval_ctx ctx = IPE_EVAL_CTX_INIT;
+
+ ipe_build_eval_ctx(&ctx, NULL, IPE_OP_BPF_PROG_LOAD,
+ IPE_HOOK_BPF_PROG_LOAD);
+ ctx.bpf_verdict = prog->aux->sig.verdict;
+ ctx.bpf_keyring = prog->aux->sig.keyring;
+ ctx.bpf_kernel = kernel;
+ return ipe_evaluate_event(&ctx);
+}
+
+int ipe_bpf_prog_load_post_integrity(struct bpf_prog *prog)
+{
+ struct ipe_eval_ctx ctx = IPE_EVAL_CTX_INIT;
+
+ ipe_build_eval_ctx(&ctx, NULL, IPE_OP_BPF_PROG_LOAD_POST_INTEGRITY,
+ IPE_HOOK_BPF_PROG_LOAD_POST_INTEGRITY);
+ ctx.bpf_verdict = BPF_SIG_METADATA_VERIFIED;
+ ctx.bpf_keyring = prog->aux->sig.keyring;
+ ctx.bpf_kernel = prog->aux->is_kernel;
+ return ipe_evaluate_event(&ctx);
+}
+#endif /* CONFIG_IPE_PROP_BPF_SIGNATURE */
+
#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
/**
* ipe_inode_setintegrity() - save integrity data from a inode to IPE's LSM blob.
diff --git a/security/ipe/hooks.h b/security/ipe/hooks.h
index 07db37332740..abdedd436aa8 100644
--- a/security/ipe/hooks.h
+++ b/security/ipe/hooks.h
@@ -10,6 +10,7 @@
#include <linux/security.h>
#include <linux/blk_types.h>
#include <linux/fsverity.h>
+#include <linux/bpf.h>
enum ipe_hook_type {
IPE_HOOK_BPRM_CHECK = 0,
@@ -18,6 +19,7 @@ enum ipe_hook_type {
IPE_HOOK_MPROTECT,
IPE_HOOK_KERNEL_READ,
IPE_HOOK_KERNEL_LOAD,
+ IPE_HOOK_BPF_PROG_LOAD,
__IPE_HOOK_MAX
};
@@ -52,4 +54,9 @@ int ipe_inode_setintegrity(const struct inode *inode, enum lsm_integrity_type ty
const void *value, size_t size);
#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
+#ifdef CONFIG_IPE_PROP_BPF_SIGNATURE
+int ipe_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
+ struct bpf_token *token, bool kernel);
+#endif /* CONFIG_IPE_PROP_BPF_SIGNATURE */
+
#endif /* _IPE_HOOKS_H */
diff --git a/security/ipe/ipe.c b/security/ipe/ipe.c
index 495bb765de1b..17ace9236253 100644
--- a/security/ipe/ipe.c
+++ b/security/ipe/ipe.c
@@ -60,6 +60,9 @@ static struct security_hook_list ipe_hooks[] __ro_after_init = {
#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
LSM_HOOK_INIT(inode_setintegrity, ipe_inode_setintegrity),
#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
+#ifdef CONFIG_IPE_PROP_BPF_SIGNATURE
+ LSM_HOOK_INIT(bpf_prog_load, ipe_bpf_prog_load),
+#endif /* CONFIG_IPE_PROP_BPF_SIGNATURE */
};
/**
diff --git a/security/ipe/policy.h b/security/ipe/policy.h
index 5bfbdbddeef8..eb066750a48b 100644
--- a/security/ipe/policy.h
+++ b/security/ipe/policy.h
@@ -17,6 +17,7 @@ enum ipe_op_type {
IPE_OP_KEXEC_INITRAMFS,
IPE_OP_POLICY,
IPE_OP_X509,
+ IPE_OP_BPF_PROG_LOAD,
__IPE_OP_MAX,
};
@@ -39,6 +40,15 @@ enum ipe_prop_type {
IPE_PROP_FSV_DIGEST,
IPE_PROP_FSV_SIG_FALSE,
IPE_PROP_FSV_SIG_TRUE,
+ IPE_PROP_BPF_SIG_UNSIGNED,
+ IPE_PROP_BPF_SIG_OK,
+ IPE_PROP_BPF_SIG_METADATA_VERIFIED,
+ IPE_PROP_BPF_KEYRING_BUILTIN,
+ IPE_PROP_BPF_KEYRING_SECONDARY,
+ IPE_PROP_BPF_KEYRING_PLATFORM,
+ IPE_PROP_BPF_KEYRING_USER,
+ IPE_PROP_BPF_KERNEL_FALSE,
+ IPE_PROP_BPF_KERNEL_TRUE,
__IPE_PROP_MAX
};
diff --git a/security/ipe/policy_parser.c b/security/ipe/policy_parser.c
index 6fa5bebf8471..c1e374d2ec34 100644
--- a/security/ipe/policy_parser.c
+++ b/security/ipe/policy_parser.c
@@ -237,6 +237,7 @@ static const match_table_t operation_tokens = {
{IPE_OP_KEXEC_INITRAMFS, "op=KEXEC_INITRAMFS"},
{IPE_OP_POLICY, "op=POLICY"},
{IPE_OP_X509, "op=X509_CERT"},
+ {IPE_OP_BPF_PROG_LOAD, "op=BPF_PROG_LOAD"},
{IPE_OP_INVALID, NULL}
};
@@ -281,6 +282,15 @@ static const match_table_t property_tokens = {
{IPE_PROP_FSV_DIGEST, "fsverity_digest=%s"},
{IPE_PROP_FSV_SIG_FALSE, "fsverity_signature=FALSE"},
{IPE_PROP_FSV_SIG_TRUE, "fsverity_signature=TRUE"},
+ {IPE_PROP_BPF_SIG_UNSIGNED, "bpf_signature=UNSIGNED"},
+ {IPE_PROP_BPF_SIG_OK, "bpf_signature=OK"},
+ {IPE_PROP_BPF_SIG_METADATA_VERIFIED, "bpf_signature=METADATA_VERIFIED"},
+ {IPE_PROP_BPF_KEYRING_BUILTIN, "bpf_keyring=BUILTIN"},
+ {IPE_PROP_BPF_KEYRING_SECONDARY, "bpf_keyring=SECONDARY"},
+ {IPE_PROP_BPF_KEYRING_PLATFORM, "bpf_keyring=PLATFORM"},
+ {IPE_PROP_BPF_KEYRING_USER, "bpf_keyring=USER"},
+ {IPE_PROP_BPF_KERNEL_FALSE, "bpf_kernel=FALSE"},
+ {IPE_PROP_BPF_KERNEL_TRUE, "bpf_kernel=TRUE"},
{IPE_PROP_INVALID, NULL}
};
@@ -331,6 +341,15 @@ static int parse_property(char *t, struct ipe_rule *r)
case IPE_PROP_DMV_SIG_TRUE:
case IPE_PROP_FSV_SIG_FALSE:
case IPE_PROP_FSV_SIG_TRUE:
+ case IPE_PROP_BPF_SIG_UNSIGNED:
+ case IPE_PROP_BPF_SIG_OK:
+ case IPE_PROP_BPF_SIG_METADATA_VERIFIED:
+ case IPE_PROP_BPF_KEYRING_BUILTIN:
+ case IPE_PROP_BPF_KEYRING_SECONDARY:
+ case IPE_PROP_BPF_KEYRING_PLATFORM:
+ case IPE_PROP_BPF_KEYRING_USER:
+ case IPE_PROP_BPF_KERNEL_FALSE:
+ case IPE_PROP_BPF_KERNEL_TRUE:
p->type = token;
break;
default:
--
2.53.0
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