->permission() sanitizing: don't pass flags to ->inode_permission()

pass that via mask instead.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/include/linux/security.h b/include/linux/security.h
index 8ce59ef..ca02f17 100644 (file)
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1456,7 +1456,7 @@ struct security_operations {
                             struct inode *new_dir, struct dentry *new_dentry);
        int (*inode_readlink) (struct dentry *dentry);
        int (*inode_follow_link) (struct dentry *dentry, struct nameidata *nd);
-       int (*inode_permission) (struct inode *inode, int mask, unsigned flags);
+       int (*inode_permission) (struct inode *inode, int mask);
        int (*inode_setattr)    (struct dentry *dentry, struct iattr *attr);
        int (*inode_getattr) (struct vfsmount *mnt, struct dentry *dentry);
        int (*inode_setxattr) (struct dentry *dentry, const char *name,

diff --git a/security/capability.c b/security/capability.c
index bbb5115..2984ea4 100644 (file)
--- a/security/capability.c
+++ b/security/capability.c
@@ -181,7 +181,7 @@ static int cap_inode_follow_link(struct dentry *dentry,
        return 0;
 }
 
-static int cap_inode_permission(struct inode *inode, int mask, unsigned flags)
+static int cap_inode_permission(struct inode *inode, int mask)
 {
        return 0;
 }

diff --git a/security/security.c b/security/security.c
index 4ba6d4c..db3b750 100644 (file)
--- a/security/security.c
+++ b/security/security.c
@@ -518,14 +518,17 @@ int security_inode_permission(struct inode *inode, int mask)
 {
        if (unlikely(IS_PRIVATE(inode)))
                return 0;
-       return security_ops->inode_permission(inode, mask, 0);
+       return security_ops->inode_permission(inode, mask);
 }
 
 int security_inode_exec_permission(struct inode *inode, unsigned int flags)
 {
+       int mask = MAY_EXEC;
        if (unlikely(IS_PRIVATE(inode)))
                return 0;
-       return security_ops->inode_permission(inode, MAY_EXEC, flags);
+       if (flags)
+               mask |= MAY_NOT_BLOCK;
+       return security_ops->inode_permission(inode, mask);
 }
 
 int security_inode_setattr(struct dentry *dentry, struct iattr *attr)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 20219ef..47a059f 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2659,12 +2659,13 @@ static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *na
        return dentry_has_perm(cred, dentry, FILE__READ);
 }
 
-static int selinux_inode_permission(struct inode *inode, int mask, unsigned flags)
+static int selinux_inode_permission(struct inode *inode, int mask)
 {
        const struct cred *cred = current_cred();
        struct common_audit_data ad;
        u32 perms;
        bool from_access;
+       unsigned __flags = mask & MAY_NOT_BLOCK ? IPERM_FLAG_RCU : 0;
 
        from_access = mask & MAY_ACCESS;
        mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
@@ -2681,7 +2682,7 @@ static int selinux_inode_permission(struct inode *inode, int mask, unsigned flag
 
        perms = file_mask_to_av(inode->i_mode, mask);
 
-       return inode_has_perm(cred, inode, perms, &ad, flags);
+       return inode_has_perm(cred, inode, perms, &ad, __flags);
 }
 
 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 9831a39..f375eb2 100644 (file)
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -689,9 +689,10 @@ static int smack_inode_rename(struct inode *old_inode,
  *
  * Returns 0 if access is permitted, -EACCES otherwise
  */
-static int smack_inode_permission(struct inode *inode, int mask, unsigned flags)
+static int smack_inode_permission(struct inode *inode, int mask)
 {
        struct smk_audit_info ad;
+       int no_block = mask & MAY_NOT_BLOCK;
 
        mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
        /*
@@ -701,7 +702,7 @@ static int smack_inode_permission(struct inode *inode, int mask, unsigned flags)
                return 0;
 
        /* May be droppable after audit */
-       if (flags & IPERM_FLAG_RCU)
+       if (no_block)
                return -ECHILD;
        smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
        smk_ad_setfield_u_fs_inode(&ad, inode);