[04/28] ima: Align ima_file_mprotect() definition with LSM infrastructure

Commit Message

Roberto Sassu March 3, 2023, 6:18 p.m. UTC

From: Roberto Sassu <[e-mail]>

Change ima_file_mprotect() definition, so that it can be registered
as implementation of the file_mprotect hook.

Signed-off-by: Roberto Sassu <[e-mail]>
---
 include/linux/ima.h               | 5 +++--
 security/integrity/ima/ima_main.c | 6 ++++--
 security/security.c               | 2 +-
 3 files changed, 8 insertions(+), 5 deletions(-)

Comments

Stefan Berger March 6, 2023, 4:56 p.m. UTC | #1

On 3/3/23 13:18, Roberto Sassu wrote:
> From: Roberto Sassu <[e-mail]>
> 
> Change ima_file_mprotect() definition, so that it can be registered
> as implementation of the file_mprotect hook.
> 
> Signed-off-by: Roberto Sassu <[e-mail]>
> ---
Reviewed-by: Stefan Berger <[e-mail]>

Patch

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 7535686a403..dd216afab6c 100644
--- a/include/linux/ima.h
+++ b/include/linux/ima.h
@@ -24,7 +24,8 @@  extern void ima_post_create_tmpfile(struct mnt_idmap *idmap,
 extern void ima_file_free(struct file *file);
 extern int ima_file_mmap(struct file *file, unsigned long reqprot,
 			 unsigned long prot, unsigned long flags);
-extern int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot);
+extern int ima_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
+			     unsigned long prot);
 extern int ima_load_data(enum kernel_load_data_id id, bool contents);
 extern int ima_post_load_data(char *buf, loff_t size,
 			      enum kernel_load_data_id id, char *description);
@@ -88,7 +89,7 @@  static inline int ima_file_mmap(struct file *file, unsigned long reqprot,
 }
 
 static inline int ima_file_mprotect(struct vm_area_struct *vma,
-				    unsigned long prot)
+				    unsigned long reqprot, unsigned long prot)
 {
 	return 0;
 }
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 4a3d0c8bcba..4e26fd49ae7 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -437,7 +437,8 @@  int ima_file_mmap(struct file *file, unsigned long reqprot,
 /**
  * ima_file_mprotect - based on policy, limit mprotect change
  * @vma: vm_area_struct protection is set to
- * @prot: contains the protection that will be applied by the kernel.
+ * @reqprot: protection requested by the application
+ * @prot: protection that will be applied by the kernel
  *
  * Files can be mmap'ed read/write and later changed to execute to circumvent
  * IMA's mmap appraisal policy rules.  Due to locking issues (mmap semaphore
@@ -447,7 +448,8 @@  int ima_file_mmap(struct file *file, unsigned long reqprot,
  *
  * On mprotect change success, return 0.  On failure, return -EACESS.
  */
-int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot)
+int ima_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
+		      unsigned long prot)
 {
 	struct ima_template_desc *template = NULL;
 	struct file *file;
diff --git a/security/security.c b/security/security.c
index a8abc11dd26..8d31b739879 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2771,7 +2771,7 @@  int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
 	ret = call_int_hook(file_mprotect, 0, vma, reqprot, prot);
 	if (ret)
 		return ret;
-	return ima_file_mprotect(vma, prot);
+	return ima_file_mprotect(vma, reqprot, prot);
 }
 
 /**