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Merge branch 'next' of git://git.infradead.org/users/pcmoore/selinux into next

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This commit is contained in:
James Morris
2015-08-15 13:29:57 +10:00
parent 0e38c35815 fda4d578ed
commit 3e5f206c00
14 changed files with 918 additions and 113 deletions
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147
security/selinux/hooks.c
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@@ -254,10 +254,21 @@ static void inode_free_security(struct inode *inode)
struct inode_security_struct *isec = inode->i_security;
struct superblock_security_struct *sbsec = inode->i_sb->s_security;
spin_lock(&sbsec->isec_lock);
if (!list_empty(&isec->list))
/*
* As not all inode security structures are in a list, we check for
* empty list outside of the lock to make sure that we won't waste
* time taking a lock doing nothing.
*
* The list_del_init() function can be safely called more than once.
* It should not be possible for this function to be called with
* concurrent list_add(), but for better safety against future changes
* in the code, we use list_empty_careful() here.
*/
if (!list_empty_careful(&isec->list)) {
spin_lock(&sbsec->isec_lock);
list_del_init(&isec->list);
spin_unlock(&sbsec->isec_lock);
spin_unlock(&sbsec->isec_lock);
}
/*
* The inode may still be referenced in a path walk and
@@ -1698,6 +1709,32 @@ out:
return rc;
}
/*
* Determine the label for an inode that might be unioned.
*/
static int selinux_determine_inode_label(const struct inode *dir,
const struct qstr *name,
u16 tclass,
u32 *_new_isid)
{
const struct superblock_security_struct *sbsec = dir->i_sb->s_security;
const struct inode_security_struct *dsec = dir->i_security;
const struct task_security_struct *tsec = current_security();
if ((sbsec->flags & SE_SBINITIALIZED) &&
(sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) {
*_new_isid = sbsec->mntpoint_sid;
} else if ((sbsec->flags & SBLABEL_MNT) &&
tsec->create_sid) {
*_new_isid = tsec->create_sid;
} else {
return security_transition_sid(tsec->sid, dsec->sid, tclass,
name, _new_isid);
}
return 0;
}
/* Check whether a task can create a file. */
static int may_create(struct inode *dir,
struct dentry *dentry,
@@ -1714,7 +1751,6 @@ static int may_create(struct inode *dir,
sbsec = dir->i_sb->s_security;
sid = tsec->sid;
newsid = tsec->create_sid;
ad.type = LSM_AUDIT_DATA_DENTRY;
ad.u.dentry = dentry;
@@ -1725,12 +1761,10 @@ static int may_create(struct inode *dir,
if (rc)
return rc;
if (!newsid || !(sbsec->flags & SBLABEL_MNT)) {
rc = security_transition_sid(sid, dsec->sid, tclass,
&dentry->d_name, &newsid);
if (rc)
return rc;
}
rc = selinux_determine_inode_label(dir, &dentry->d_name, tclass,
&newsid);
if (rc)
return rc;
rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad);
if (rc)
@@ -2704,32 +2738,14 @@ static int selinux_dentry_init_security(struct dentry *dentry, int mode,
struct qstr *name, void **ctx,
u32 *ctxlen)
{
const struct cred *cred = current_cred();
struct task_security_struct *tsec;
struct inode_security_struct *dsec;
struct superblock_security_struct *sbsec;
struct inode *dir = d_backing_inode(dentry->d_parent);
u32 newsid;
int rc;
tsec = cred->security;
dsec = dir->i_security;
sbsec = dir->i_sb->s_security;
if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
newsid = tsec->create_sid;
} else {
rc = security_transition_sid(tsec->sid, dsec->sid,
inode_mode_to_security_class(mode),
name,
&newsid);
if (rc) {
printk(KERN_WARNING
"%s: security_transition_sid failed, rc=%d\n",
__func__, -rc);
return rc;
}
}
rc = selinux_determine_inode_label(d_inode(dentry->d_parent), name,
inode_mode_to_security_class(mode),
&newsid);
if (rc)
return rc;
return security_sid_to_context(newsid, (char **)ctx, ctxlen);
}
@@ -2752,22 +2768,12 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
sid = tsec->sid;
newsid = tsec->create_sid;
if ((sbsec->flags & SE_SBINITIALIZED) &&
(sbsec->behavior == SECURITY_FS_USE_MNTPOINT))
newsid = sbsec->mntpoint_sid;
else if (!newsid || !(sbsec->flags & SBLABEL_MNT)) {
rc = security_transition_sid(sid, dsec->sid,
inode_mode_to_security_class(inode->i_mode),
qstr, &newsid);
if (rc) {
printk(KERN_WARNING "%s: "
"security_transition_sid failed, rc=%d (dev=%s "
"ino=%ld)\n",
__func__,
-rc, inode->i_sb->s_id, inode->i_ino);
return rc;
}
}
rc = selinux_determine_inode_label(
dir, qstr,
inode_mode_to_security_class(inode->i_mode),
&newsid);
if (rc)
return rc;
/* Possibly defer initialization to selinux_complete_init. */
if (sbsec->flags & SE_SBINITIALIZED) {
@@ -3228,6 +3234,46 @@ static void selinux_file_free_security(struct file *file)
file_free_security(file);
}
/*
* Check whether a task has the ioctl permission and cmd
* operation to an inode.
*/
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 inode *inode = file_inode(file);
struct inode_security_struct *isec = inode->i_security;
struct lsm_ioctlop_audit ioctl;
u32 ssid = cred_sid(cred);
int rc;
u8 driver = cmd >> 8;
u8 xperm = cmd & 0xff;
ad.type = LSM_AUDIT_DATA_IOCTL_OP;
ad.u.op = &ioctl;
ad.u.op->cmd = cmd;
ad.u.op->path = file->f_path;
if (ssid != fsec->sid) {
rc = avc_has_perm(ssid, fsec->sid,
SECCLASS_FD,
FD__USE,
&ad);
if (rc)
goto out;
}
if (unlikely(IS_PRIVATE(inode)))
return 0;
rc = avc_has_extended_perms(ssid, isec->sid, isec->sclass,
requested, driver, xperm, &ad);
out:
return rc;
}
static int selinux_file_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
@@ -3270,7 +3316,7 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
* to the file's ioctl() function.
*/
default:
error = file_has_perm(cred, file, FILE__IOCTL);
error = ioctl_has_perm(cred, file, FILE__IOCTL, (u16) cmd);
}
return error;
}
@@ -4520,6 +4566,7 @@ static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority
sksec->peer_sid = SECINITSID_UNLABELED;
sksec->sid = SECINITSID_UNLABELED;
sksec->sclass = SECCLASS_SOCKET;
selinux_netlbl_sk_security_reset(sksec);
sk->sk_security = sksec;