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security: Add hook to invalidate inode security labels 

Add a hook to invalidate an inode's security label when the cached
information becomes invalid.

Add the new hook in selinux: set a flag when a security label becomes
invalid.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2015-12-24 11:09:40 -05:00 committed by Paul Moore
parent 83da53c5a3
commit 6f3be9f562
5 changed files with 45 additions and 10 deletions
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6
include/linux/lsm_hooks.h
View File

@ -1261,6 +1261,10 @@
* audit_rule_init.
* @rule contains the allocated rule
*
* @inode_invalidate_secctx:
* Notify the security module that it must revalidate the security context
* of an inode.
*
* @inode_notifysecctx:
* Notify the security module of what the security context of an inode
* should be. Initializes the incore security context managed by the
@ -1516,6 +1520,7 @@ union security_list_options {
int (*secctx_to_secid)(const char *secdata, u32 seclen, u32 *secid);
void (*release_secctx)(char *secdata, u32 seclen);
void (*inode_invalidate_secctx)(struct inode *inode);
int (*inode_notifysecctx)(struct inode *inode, void *ctx, u32 ctxlen);
int (*inode_setsecctx)(struct dentry *dentry, void *ctx, u32 ctxlen);
int (*inode_getsecctx)(struct inode *inode, void **ctx, u32 *ctxlen);
@ -1757,6 +1762,7 @@ struct security_hook_heads {
struct list_head secid_to_secctx;
struct list_head secctx_to_secid;
struct list_head release_secctx;
struct list_head inode_invalidate_secctx;
struct list_head inode_notifysecctx;
struct list_head inode_setsecctx;
struct list_head inode_getsecctx;

5
include/linux/security.h
View File

@ -353,6 +353,7 @@ int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid);
void security_release_secctx(char *secdata, u32 seclen);
void security_inode_invalidate_secctx(struct inode *inode);
int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen);
int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen);
int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen);
@ -1093,6 +1094,10 @@ static inline void security_release_secctx(char *secdata, u32 seclen)
{
}
static inline void security_inode_invalidate_secctx(struct inode *inode)
{
}
static inline int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
{
return -EOPNOTSUPP;

8
security/security.c
View File

@ -1161,6 +1161,12 @@ void security_release_secctx(char *secdata, u32 seclen)
}
EXPORT_SYMBOL(security_release_secctx);
void security_inode_invalidate_secctx(struct inode *inode)
{
call_void_hook(inode_invalidate_secctx, inode);
}
EXPORT_SYMBOL(security_inode_invalidate_secctx);
int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
{
return call_int_hook(inode_notifysecctx, 0, inode, ctx, ctxlen);
@ -1763,6 +1769,8 @@ struct security_hook_heads security_hook_heads = {
LIST_HEAD_INIT(security_hook_heads.secctx_to_secid),
.release_secctx =
LIST_HEAD_INIT(security_hook_heads.release_secctx),
.inode_invalidate_secctx =
LIST_HEAD_INIT(security_hook_heads.inode_invalidate_secctx),
.inode_notifysecctx =
LIST_HEAD_INIT(security_hook_heads.inode_notifysecctx),
.inode_setsecctx =

30
security/selinux/hooks.c
View File

@ -820,7 +820,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
goto out;
root_isec->sid = rootcontext_sid;
root_isec->initialized = 1;
root_isec->initialized = LABEL_INITIALIZED;
}
if (defcontext_sid) {
@ -1308,11 +1308,11 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
unsigned len = 0;
int rc = 0;
if (isec->initialized)
if (isec->initialized == LABEL_INITIALIZED)
goto out;
mutex_lock(&isec->lock);
if (isec->initialized)
if (isec->initialized == LABEL_INITIALIZED)
goto out_unlock;
sbsec = inode->i_sb->s_security;
@ -1484,7 +1484,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
break;
}
isec->initialized = 1;
isec->initialized = LABEL_INITIALIZED;
out_unlock:
mutex_unlock(&isec->lock);
@ -2790,7 +2790,7 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
struct inode_security_struct *isec = inode->i_security;
isec->sclass = inode_mode_to_security_class(inode->i_mode);
isec->sid = newsid;
isec->initialized = 1;
isec->initialized = LABEL_INITIALIZED;
}
if (!ss_initialized || !(sbsec->flags & SBLABEL_MNT))
@ -3089,7 +3089,7 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
isec->sclass = inode_mode_to_security_class(inode->i_mode);
isec->sid = newsid;
isec->initialized = 1;
isec->initialized = LABEL_INITIALIZED;
return;
}
@ -3183,7 +3183,7 @@ static int selinux_inode_setsecurity(struct inode *inode, const char *name,
isec->sclass = inode_mode_to_security_class(inode->i_mode);
isec->sid = newsid;
isec->initialized = 1;
isec->initialized = LABEL_INITIALIZED;
return 0;
}
@ -3761,7 +3761,7 @@ static void selinux_task_to_inode(struct task_struct *p,
u32 sid = task_sid(p);
isec->sid = sid;
isec->initialized = 1;
isec->initialized = LABEL_INITIALIZED;
}
/* Returns error only if unable to parse addresses */
@ -4092,7 +4092,7 @@ static int selinux_socket_post_create(struct socket *sock, int family,
return err;
}
isec->initialized = 1;
isec->initialized = LABEL_INITIALIZED;
if (sock->sk) {
sksec = sock->sk->sk_security;
@ -4283,7 +4283,7 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
isec = inode_security(SOCK_INODE(sock));
newisec->sclass = isec->sclass;
newisec->sid = isec->sid;
newisec->initialized = 1;
newisec->initialized = LABEL_INITIALIZED;
return 0;
}
@ -5775,6 +5775,15 @@ static void selinux_release_secctx(char *secdata, u32 seclen)
kfree(secdata);
}
static void selinux_inode_invalidate_secctx(struct inode *inode)
{
struct inode_security_struct *isec = inode->i_security;
mutex_lock(&isec->lock);
isec->initialized = LABEL_INVALID;
mutex_unlock(&isec->lock);
}
/*
* called with inode->i_mutex locked
*/
@ -6006,6 +6015,7 @@ static struct security_hook_list selinux_hooks[] = {
LSM_HOOK_INIT(secid_to_secctx, selinux_secid_to_secctx),
LSM_HOOK_INIT(secctx_to_secid, selinux_secctx_to_secid),
LSM_HOOK_INIT(release_secctx, selinux_release_secctx),
LSM_HOOK_INIT(inode_invalidate_secctx, selinux_inode_invalidate_secctx),
LSM_HOOK_INIT(inode_notifysecctx, selinux_inode_notifysecctx),
LSM_HOOK_INIT(inode_setsecctx, selinux_inode_setsecctx),
LSM_HOOK_INIT(inode_getsecctx, selinux_inode_getsecctx),

6
security/selinux/include/objsec.h
View File

@ -37,6 +37,12 @@ struct task_security_struct {
u32 sockcreate_sid; /* fscreate SID */
};
enum label_initialized {
LABEL_MISSING, /* not initialized */
LABEL_INITIALIZED, /* inizialized */
LABEL_INVALID /* invalid */
};
struct inode_security_struct {
struct inode *inode; /* back pointer to inode object */
union {