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security: Add hook to invalidate inode security labels

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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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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),