[18/97] LSM: Use lsm_export in security_kernel_act_as

Commit Message

Casey Schaufler Feb. 28, 2019, 10:18 p.m. UTC

From: Casey Schaufler <[e-mail]>

Convert security_kernel_act_as to use the lsm_export structure
instead of a u32 secid. There is some scaffolding involved
that will be removed when the related data is updated.

Signed-off-by: Casey Schaufler <[e-mail]>
---
 include/linux/cred.h     |  3 ++-
 include/linux/security.h |  5 +++--
 kernel/cred.c            | 10 ++++++----
 security/security.c      |  8 ++------
 4 files changed, 13 insertions(+), 13 deletions(-)

Patch

diff --git a/include/linux/cred.h b/include/linux/cred.h
index ddd45bb74887..023f422eefd6 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -22,6 +22,7 @@ 
 
 struct cred;
 struct inode;
+struct lsm_export;
 
 /*
  * COW Supplementary groups list
@@ -165,7 +166,7 @@  extern const struct cred *override_creds(const struct cred *);
 extern void revert_creds(const struct cred *);
 extern struct cred *prepare_kernel_cred(struct task_struct *);
 extern int change_create_files_as(struct cred *, struct inode *);
-extern int set_security_override(struct cred *, u32);
+extern int set_security_override(struct cred *, struct lsm_export *);
 extern int set_security_override_from_ctx(struct cred *, const char *);
 extern int set_create_files_as(struct cred *, struct inode *);
 extern int cred_fscmp(const struct cred *, const struct cred *);
diff --git a/include/linux/security.h b/include/linux/security.h
index 73017c9e937a..08fb928cc86b 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -373,7 +373,7 @@  void security_cred_free(struct cred *cred);
 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp);
 void security_transfer_creds(struct cred *new, const struct cred *old);
 void security_cred_getsecid(const struct cred *c, u32 *secid);
-int security_kernel_act_as(struct cred *new, u32 secid);
+int security_kernel_act_as(struct cred *new, struct lsm_export *l);
 int security_kernel_create_files_as(struct cred *new, struct inode *inode);
 int security_kernel_module_request(char *kmod_name);
 int security_kernel_load_data(enum kernel_load_data_id id);
@@ -945,7 +945,8 @@  static inline void security_transfer_creds(struct cred *new,
 {
 }
 
-static inline int security_kernel_act_as(struct cred *cred, u32 secid)
+static inline int security_kernel_act_as(struct cred *cred,
+					 struct lsm_export *l)
 {
 	return 0;
 }
diff --git a/kernel/cred.c b/kernel/cred.c
index 45d77284aed0..40a3fde22667 100644
--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -701,14 +701,14 @@  EXPORT_SYMBOL(prepare_kernel_cred);
 /**
  * set_security_override - Set the security ID in a set of credentials
  * @new: The credentials to alter
- * @secid: The LSM security ID to set
+ * @l: The LSM security information to set
  *
  * Set the LSM security ID in a set of credentials so that the subjective
  * security is overridden when an alternative set of credentials is used.
  */
-int set_security_override(struct cred *new, u32 secid)
+int set_security_override(struct cred *new, struct lsm_export *l)
 {
-	return security_kernel_act_as(new, secid);
+	return security_kernel_act_as(new, l);
 }
 EXPORT_SYMBOL(set_security_override);
 
@@ -724,6 +724,7 @@  EXPORT_SYMBOL(set_security_override);
  */
 int set_security_override_from_ctx(struct cred *new, const char *secctx)
 {
+	struct lsm_export le;
 	u32 secid;
 	int ret;
 
@@ -731,7 +732,8 @@  int set_security_override_from_ctx(struct cred *new, const char *secctx)
 	if (ret < 0)
 		return ret;
 
-	return set_security_override(new, secid);
+	lsm_export_to_all(&le, secid);
+	return set_security_override(new, &le);
 }
 EXPORT_SYMBOL(set_security_override_from_ctx);
 
diff --git a/security/security.c b/security/security.c
index 43afcdf1e424..1607f19f2824 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1601,13 +1601,9 @@  void security_cred_getsecid(const struct cred *c, u32 *secid)
 }
 EXPORT_SYMBOL(security_cred_getsecid);
 
-int security_kernel_act_as(struct cred *new, u32 secid)
+int security_kernel_act_as(struct cred *new, struct lsm_export *l)
 {
-	struct lsm_export data = { .flags = LSM_EXPORT_NONE };
-
-	lsm_export_to_all(&data, secid);
-
-	return call_int_hook(kernel_act_as, 0, new, &data);
+	return call_int_hook(kernel_act_as, 0, new, l);
 }
 
 int security_kernel_create_files_as(struct cred *new, struct inode *inode)