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Security: Add hook to calculate context based on a negative dentry.

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There is a time where we need to calculate a context without the
inode having been created yet. To do this we take the negative dentry and
calculate a context based on the process and the parent directory contexts.

Acked-by: Eric Paris <eparis@redhat.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Matthew N. Dodd <Matthew.Dodd@sparta.com>
Signed-off-by: Miguel Rodel Felipe <Rodel_FM@dsi.a-star.edu.sg>
Signed-off-by: Phua Eu Gene <PHUA_Eu_Gene@dsi.a-star.edu.sg>
Signed-off-by: Khin Mi Mi Aung <Mi_Mi_AUNG@dsi.a-star.edu.sg>
Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
David Quigley
2013-05-22 12:50:34 -04:00
committed by Trond Myklebust
parent 4488cc96c5
commit d47be3dfec
4 changed files with 80 additions and 0 deletions
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35
security/selinux/hooks.c
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@@ -2515,6 +2515,40 @@ static void selinux_inode_free_security(struct inode *inode)
inode_free_security(inode);
}
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 = dentry->d_parent->d_inode;
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;
}
}
return security_sid_to_context(newsid, (char **)ctx, ctxlen);
}
static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr, char **name,
void **value, size_t *len)
@@ -5562,6 +5596,7 @@ static struct security_operations selinux_ops = {
.sb_clone_mnt_opts = selinux_sb_clone_mnt_opts,
.sb_parse_opts_str = selinux_parse_opts_str,
.dentry_init_security = selinux_dentry_init_security,
.inode_alloc_security = selinux_inode_alloc_security,
.inode_free_security = selinux_inode_free_security,