Commit bb6c6b02 authored by Casey Schaufler's avatar Casey Schaufler Committed by Kees Cook

SELinux: Abstract use of file security blob

Don't use the file->f_security pointer directly.
Provide a helper function that provides the security blob pointer.
Signed-off-by: default avatarCasey Schaufler <casey@schaufler-ca.com>
Reviewed-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent bbd3662a
......@@ -394,7 +394,7 @@ static int file_alloc_security(struct file *file)
static void file_free_security(struct file *file)
{
struct file_security_struct *fsec = file->f_security;
struct file_security_struct *fsec = selinux_file(file);
file->f_security = NULL;
kmem_cache_free(file_security_cache, fsec);
}
......@@ -1733,7 +1733,7 @@ static int file_has_perm(const struct cred *cred,
struct file *file,
u32 av)
{
struct file_security_struct *fsec = file->f_security;
struct file_security_struct *fsec = selinux_file(file);
struct inode *inode = file_inode(file);
struct common_audit_data ad;
u32 sid = cred_sid(cred);
......@@ -2077,7 +2077,7 @@ static int selinux_binder_transfer_file(struct task_struct *from,
struct file *file)
{
u32 sid = task_sid(to);
struct file_security_struct *fsec = file->f_security;
struct file_security_struct *fsec = selinux_file(file);
struct dentry *dentry = file->f_path.dentry;
struct inode_security_struct *isec;
struct common_audit_data ad;
......@@ -3323,7 +3323,7 @@ static int selinux_revalidate_file_permission(struct file *file, int mask)
static int selinux_file_permission(struct file *file, int mask)
{
struct inode *inode = file_inode(file);
struct file_security_struct *fsec = file->f_security;
struct file_security_struct *fsec = selinux_file(file);
struct inode_security_struct *isec;
u32 sid = current_sid();
......@@ -3358,7 +3358,7 @@ static int ioctl_has_perm(const struct cred *cred, struct file *file,
u32 requested, u16 cmd)
{
struct common_audit_data ad;
struct file_security_struct *fsec = file->f_security;
struct file_security_struct *fsec = selinux_file(file);
struct inode *inode = file_inode(file);
struct inode_security_struct *isec;
struct lsm_ioctlop_audit ioctl;
......@@ -3610,7 +3610,7 @@ static void selinux_file_set_fowner(struct file *file)
{
struct file_security_struct *fsec;
fsec = file->f_security;
fsec = selinux_file(file);
fsec->fown_sid = current_sid();
}
......@@ -3625,7 +3625,7 @@ static int selinux_file_send_sigiotask(struct task_struct *tsk,
/* struct fown_struct is never outside the context of a struct file */
file = container_of(fown, struct file, f_owner);
fsec = file->f_security;
fsec = selinux_file(file);
if (!signum)
perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
......@@ -3649,7 +3649,7 @@ static int selinux_file_open(struct file *file)
struct file_security_struct *fsec;
struct inode_security_struct *isec;
fsec = file->f_security;
fsec = selinux_file(file);
isec = inode_security(file_inode(file));
/*
* Save inode label and policy sequence number
......@@ -3788,7 +3788,7 @@ static int selinux_kernel_module_from_file(struct file *file)
ad.type = LSM_AUDIT_DATA_FILE;
ad.u.file = file;
fsec = file->f_security;
fsec = selinux_file(file);
if (sid != fsec->sid) {
rc = avc_has_perm(&selinux_state,
sid, fsec->sid, SECCLASS_FD, FD__USE, &ad);
......
......@@ -165,4 +165,9 @@ static inline struct task_security_struct *selinux_cred(const struct cred *cred)
return cred->security + selinux_blob_sizes.lbs_cred;
}
static inline struct file_security_struct *selinux_file(const struct file *file)
{
return file->f_security;
}
#endif /* _SELINUX_OBJSEC_H_ */
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