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selinux: consider filesystem subtype in policies

Forráskód böngészése 
Not considering sub filesystem has the following limitation. Support
for SELinux in FUSE is dependent on the particular userspace
filesystem, which is identified by the subtype. For e.g, GlusterFS,
a FUSE based filesystem supports SELinux (by mounting and processing
FUSE requests in different threads, avoiding the mount time
deadlock), whereas other FUSE based filesystems (identified by a
different subtype) have the mount time deadlock.

By considering the subtype of the filesytem in the SELinux policies,
allows us to specify a filesystem subtype, in the following way:

fs_use_xattr fuse.glusterfs gen_context(system_u:object_r:fs_t,s0);

This way not all FUSE filesystems are put in the same bucket and
subjected to the limitations of the other subtypes.

Signed-off-by: Anand Avati <avati@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Anand Avati
2013-04-16 18:56:19 -04:00
committed by Eric Paris
szülő 2be4d74f2f
commit 102aefdda4
2 fájl változott, egészen pontosan 60 új sor hozzáadva és 22 régi sor törölve
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42
security/selinux/ss/services.c
Fájl megtekintése

@@ -2334,16 +2334,50 @@ int security_fs_use(struct super_block *sb)
struct ocontext *c;
struct superblock_security_struct *sbsec = sb->s_security;
const char *fstype = sb->s_type->name;
const char *subtype = (sb->s_subtype && sb->s_subtype[0]) ? sb->s_subtype : NULL;
struct ocontext *base = NULL;
read_lock(&policy_rwlock);
c = policydb.ocontexts[OCON_FSUSE];
while (c) {
if (strcmp(fstype, c->u.name) == 0)
for (c = policydb.ocontexts[OCON_FSUSE]; c; c = c->next) {
char *sub;
int baselen;
baselen = strlen(fstype);
/* if base does not match, this is not the one */
if (strncmp(fstype, c->u.name, baselen))
continue;
/* if there is no subtype, this is the one! */
if (!subtype)
break;
/* skip past the base in this entry */
sub = c->u.name + baselen;
/* entry is only a base. save it. keep looking for subtype */
if (sub[0] == '\0') {
base = c;
continue;
}
/* entry is not followed by a subtype, so it is not a match */
if (sub[0] != '.')
continue;
/* whew, we found a subtype of this fstype */
sub++; /* move past '.' */
/* exact match of fstype AND subtype */
if (!strcmp(subtype, sub))
break;
c = c->next;
}
/* in case we had found an fstype match but no subtype match */
if (!c)
c = base;
if (c) {
sbsec->behavior = c->v.behavior;
if (!c->sid[0]) {