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Commit f50a3ec9 authored by Kohei Kaigai's avatar Kohei Kaigai Committed by Eric Paris
Browse files

selinux: add type_transition with name extension support for selinuxfs 



The attached patch allows /selinux/create takes optional 4th argument
to support TYPE_TRANSITION with name extension for userspace object
managers.
If 4th argument is not supplied, it shall perform as existing kernel.
In fact, the regression test of SE-PostgreSQL works well on the patched
kernel.

Thanks,

Signed-off-by: default avatarKaiGai Kohei <kohei.kaigai@eu.nec.com>
[manually verify fuzz was not an issue, and it wasn't: eparis]
Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 6bde95ce

security/selinux/include/security.h

+2 −2
Original line number Diff line number Diff line
@@ -112,8 +112,8 @@ void security_compute_av_user(u32 ssid, u32 tsid, 
int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,

			    const struct qstr *qstr, u32 *out_sid);



int security_transition_sid_user(u32 ssid, u32 tsid,

				 u16 tclass, u32 *out_sid);

int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,

				 const char *objname, u32 *out_sid);



int security_member_sid(u32 ssid, u32 tsid,

	u16 tclass, u32 *out_sid);

security/selinux/selinuxfs.c

+14 −2
Original line number Diff line number Diff line
@@ -753,11 +753,13 @@ out: 
static ssize_t sel_write_create(struct file *file, char *buf, size_t size)

{

	char *scon = NULL, *tcon = NULL;

	char *namebuf = NULL, *objname = NULL;

	u32 ssid, tsid, newsid;

	u16 tclass;

	ssize_t length;

	char *newcon = NULL;

	u32 len;

	int nargs;



	length = task_has_security(current, SECURITY__COMPUTE_CREATE);

	if (length)
@@ -773,9 +775,17 @@ static ssize_t sel_write_create(struct file *file, char *buf, size_t size) 
	if (!tcon)

		goto out;



	length = -ENOMEM;

	namebuf = kzalloc(size + 1, GFP_KERNEL);

	if (!namebuf)

		goto out;



	length = -EINVAL;

	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)

	nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);

	if (nargs < 3 || nargs > 4)

		goto out;

	if (nargs == 4)

		objname = namebuf;



	length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);

	if (length)
@@ -785,7 +795,8 @@ static ssize_t sel_write_create(struct file *file, char *buf, size_t size) 
	if (length)

		goto out;



	length = security_transition_sid_user(ssid, tsid, tclass, &newsid);

	length = security_transition_sid_user(ssid, tsid, tclass,

					      objname, &newsid);

	if (length)

		goto out;
@@ -804,6 +815,7 @@ static ssize_t sel_write_create(struct file *file, char *buf, size_t size) 
	length = len;

out:

	kfree(newcon);

	kfree(namebuf);

	kfree(tcon);

	kfree(scon);

	return length;

security/selinux/ss/services.c

+9 −8
Original line number Diff line number Diff line
@@ -1360,14 +1360,14 @@ out: 


static void filename_compute_type(struct policydb *p, struct context *newcontext,

				  u32 scon, u32 tcon, u16 tclass,

				  const struct qstr *qstr)

				  const char *objname)

{

	struct filename_trans *ft;

	for (ft = p->filename_trans; ft; ft = ft->next) {

		if (ft->stype == scon &&

		    ft->ttype == tcon &&

		    ft->tclass == tclass &&

		    !strcmp(ft->name, qstr->name)) {

		    !strcmp(ft->name, objname)) {

			newcontext->type = ft->otype;

			return;

		}
@@ -1378,7 +1378,7 @@ static int security_compute_sid(u32 ssid, 
				u32 tsid,

				u16 orig_tclass,

				u32 specified,

				const struct qstr *qstr,

				const char *objname,

				u32 *out_sid,

				bool kern)

{
@@ -1479,9 +1479,9 @@ static int security_compute_sid(u32 ssid, 
	}



	/* if we have a qstr this is a file trans check so check those rules */

	if (qstr)

	if (objname)

		filename_compute_type(&policydb, &newcontext, scontext->type,

				      tcontext->type, tclass, qstr);

				      tcontext->type, tclass, objname);



	/* Check for class-specific changes. */

	if (specified & AVTAB_TRANSITION) {
@@ -1539,13 +1539,14 @@ int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, 
			    const struct qstr *qstr, u32 *out_sid)

{

	return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,

				    qstr, out_sid, true);

				    qstr ? qstr->name : NULL, out_sid, true);

}



int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid)

int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,

				 const char *objname, u32 *out_sid)

{

	return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION,

				    NULL, out_sid, false);

				    objname, out_sid, false);

}



/**