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authorCasey Schaufler <casey@schaufler-ca.com>2018-09-21 17:22:32 -0700
committerKees Cook <keescook@chromium.org>2019-01-08 13:18:44 -0800
commitbb6c6b02ccb7d76f628c5dc6abe13f1115637cfd (patch)
treed8b08890fd9b9c84d6d1a37f182c3441273e6579
parentbbd3662a834813730912a58efb44dd6df6d952e6 (diff)
downloadlinux-bb6c6b02ccb7d76f628c5dc6abe13f1115637cfd.tar.gz
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: Casey Schaufler <casey@schaufler-ca.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
-rw-r--r--security/selinux/hooks.c18
-rw-r--r--security/selinux/include/objsec.h5
2 files changed, 14 insertions, 9 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 239b13b442e7..620be0367c0b 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -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);
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index c2974b031d05..e0ac2992e059 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -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_ */