Merge tag 'ipe-pr-20251202' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipe

Pull IPE udates from Fan Wu:
 "The primary change is the addition of support for the AT_EXECVE_CHECK
  flag. This allows interpreters to signal the kernel to perform IPE
  security checks on script files before execution, extending IPE
  enforcement to indirectly executed scripts.

  Update documentation for it, and also fix a comment"

* tag 'ipe-pr-20251202' of git://git.kernel.org/pub/scm/linux/kernel/git/wufan/ipe:
  ipe: Update documentation for script enforcement
  ipe: Add AT_EXECVE_CHECK support for script enforcement
  ipe: Drop a duplicated CONFIG_ prefix in the ifdeffery

4 files changed, 33 insertions, 1 deletions

diff --git a/security/ipe/audit.c b/security/ipe/audit.c
index de5fed62592e..3f0deeb54912 100644
--- a/security/ipe/audit.c
+++ b/security/ipe/audit.c
@@ -46,6 +46,7 @@ static const char *const audit_op_names[__IPE_OP_MAX + 1] = {
 
 static const char *const audit_hook_names[__IPE_HOOK_MAX] = {
 	"BPRM_CHECK",
+	"BPRM_CREDS_FOR_EXEC",
 	"MMAP",
 	"MPROTECT",
 	"KERNEL_READ",
diff --git a/security/ipe/hooks.c b/security/ipe/hooks.c
index 1053a4acf589..603abdc9ce3b 100644
--- a/security/ipe/hooks.c
+++ b/security/ipe/hooks.c
@@ -36,6 +36,33 @@ int ipe_bprm_check_security(struct linux_binprm *bprm)
 }
 
 /**
+ * ipe_bprm_creds_for_exec() - ipe security hook function for bprm creds check.
+ * @bprm: Supplies a pointer to a linux_binprm structure to source the file
+ *	  being evaluated.
+ *
+ * This LSM hook is called when userspace signals the kernel to check a file
+ * for execution through the execveat syscall with the AT_EXECVE_CHECK flag.
+ * The hook triggers IPE policy evaluation on the script file and returns
+ * the policy decision to userspace. The userspace program receives the
+ * return code and can decide whether to proceed with script execution.
+ *
+ * Return:
+ * * %0		- Success
+ * * %-EACCES	- Did not pass IPE policy
+ */
+int ipe_bprm_creds_for_exec(struct linux_binprm *bprm)
+{
+	struct ipe_eval_ctx ctx = IPE_EVAL_CTX_INIT;
+
+	if (!bprm->is_check)
+		return 0;
+
+	ipe_build_eval_ctx(&ctx, bprm->file, IPE_OP_EXEC,
+			   IPE_HOOK_BPRM_CREDS_FOR_EXEC);
+	return ipe_evaluate_event(&ctx);
+}
+
+/**
  * ipe_mmap_file() - ipe security hook function for mmap check.
  * @f: File being mmap'd. Can be NULL in the case of anonymous memory.
  * @reqprot: The requested protection on the mmap, passed from usermode.
@@ -312,4 +339,4 @@ int ipe_inode_setintegrity(const struct inode *inode,
 
 	return -EINVAL;
 }
-#endif /* CONFIG_CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
+#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
diff --git a/security/ipe/hooks.h b/security/ipe/hooks.h
index 38d4a387d039..07db37332740 100644
--- a/security/ipe/hooks.h
+++ b/security/ipe/hooks.h
@@ -13,6 +13,7 @@
 
 enum ipe_hook_type {
 	IPE_HOOK_BPRM_CHECK = 0,
+	IPE_HOOK_BPRM_CREDS_FOR_EXEC,
 	IPE_HOOK_MMAP,
 	IPE_HOOK_MPROTECT,
 	IPE_HOOK_KERNEL_READ,
@@ -24,6 +25,8 @@ enum ipe_hook_type {
 
 int ipe_bprm_check_security(struct linux_binprm *bprm);
 
+int ipe_bprm_creds_for_exec(struct linux_binprm *bprm);
+
 int ipe_mmap_file(struct file *f, unsigned long reqprot, unsigned long prot,
 		  unsigned long flags);
 
diff --git a/security/ipe/ipe.c b/security/ipe/ipe.c
index 71644748ed56..495bb765de1b 100644
--- a/security/ipe/ipe.c
+++ b/security/ipe/ipe.c
@@ -47,6 +47,7 @@ struct ipe_inode *ipe_inode(const struct inode *inode)
 
 static struct security_hook_list ipe_hooks[] __ro_after_init = {
 	LSM_HOOK_INIT(bprm_check_security, ipe_bprm_check_security),
+	LSM_HOOK_INIT(bprm_creds_for_exec, ipe_bprm_creds_for_exec),
 	LSM_HOOK_INIT(mmap_file, ipe_mmap_file),
 	LSM_HOOK_INIT(file_mprotect, ipe_file_mprotect),
 	LSM_HOOK_INIT(kernel_read_file, ipe_kernel_read_file),