[PATCH v3 04/25] ima: Align ima_file_mprotect() definition with LSM infrastructure

Roberto Sassu
2023-09-04T13:36:04Z

From: Roberto Sassu <roberto.sassu@huawei.com>

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

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
---
include/linux/ima.h | 5 +++--
security/integrity/ima/ima_main.c | 6 ++++--
security/security.c | 2 +-
3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/include/linux/ima.h b/include/linux/ima.h
index 893c3b98b4d0..56e72c0beb96 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);
+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 52e742d32f4b..e9e2a3ad25a1 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -441,7 +441,8 @@ 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
@@ -451,7 +452,8 @@ 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 96f2c68a1571..dffb67e6e119 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2721,7 +2721,7 @@ 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);
}

/**
--
2.34.1