Commit ba75082e authored by Linus Torvalds's avatar Linus Torvalds

Merge tag 'selinux-pr-20191126' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux

Pull selinux updates from Paul Moore:
 "Only three SELinux patches for v5.5:

   - Remove the size limit on SELinux policies, the limitation was a
     lingering vestige and no longer necessary.

   - Allow file labeling before the policy is loaded. This should ease
     some of the burden when the policy is initially loaded (no need to
     relabel files), but it should also help enable some new system
     concepts which dynamically create the root filesystem in the
     initrd.

   - Add support for the "greatest lower bound" policy construct which
     is defined as the intersection of the MLS range of two SELinux
     labels"

* tag 'selinux-pr-20191126' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
  selinux: default_range glblub implementation
  selinux: allow labeling before policy is loaded
  selinux: remove load size limit
parents 8a99117f 42345b68
...@@ -3144,6 +3144,9 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name, ...@@ -3144,6 +3144,9 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
return dentry_has_perm(current_cred(), dentry, FILE__SETATTR); return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
} }
if (!selinux_state.initialized)
return (inode_owner_or_capable(inode) ? 0 : -EPERM);
sbsec = inode->i_sb->s_security; sbsec = inode->i_sb->s_security;
if (!(sbsec->flags & SBLABEL_MNT)) if (!(sbsec->flags & SBLABEL_MNT))
return -EOPNOTSUPP; return -EOPNOTSUPP;
...@@ -3227,6 +3230,15 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, ...@@ -3227,6 +3230,15 @@ static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
return; return;
} }
if (!selinux_state.initialized) {
/* If we haven't even been initialized, then we can't validate
* against a policy, so leave the label as invalid. It may
* resolve to a valid label on the next revalidation try if
* we've since initialized.
*/
return;
}
rc = security_context_to_sid_force(&selinux_state, value, size, rc = security_context_to_sid_force(&selinux_state, value, size,
&newsid); &newsid);
if (rc) { if (rc) {
......
...@@ -40,10 +40,11 @@ ...@@ -40,10 +40,11 @@
#define POLICYDB_VERSION_CONSTRAINT_NAMES 29 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29
#define POLICYDB_VERSION_XPERMS_IOCTL 30 #define POLICYDB_VERSION_XPERMS_IOCTL 30
#define POLICYDB_VERSION_INFINIBAND 31 #define POLICYDB_VERSION_INFINIBAND 31
#define POLICYDB_VERSION_GLBLUB 32
/* Range of policy versions we understand*/ /* Range of policy versions we understand*/
#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
#define POLICYDB_VERSION_MAX POLICYDB_VERSION_INFINIBAND #define POLICYDB_VERSION_MAX POLICYDB_VERSION_GLBLUB
/* Mask for just the mount related flags */ /* Mask for just the mount related flags */
#define SE_MNTMASK 0x0f #define SE_MNTMASK 0x0f
......
...@@ -548,10 +548,6 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf, ...@@ -548,10 +548,6 @@ static ssize_t sel_write_load(struct file *file, const char __user *buf,
if (*ppos != 0) if (*ppos != 0)
goto out; goto out;
length = -EFBIG;
if (count > 64 * 1024 * 1024)
goto out;
length = -ENOMEM; length = -ENOMEM;
data = vmalloc(count); data = vmalloc(count);
if (!data) if (!data)
......
...@@ -95,6 +95,38 @@ static inline int mls_context_cpy_high(struct context *dst, struct context *src) ...@@ -95,6 +95,38 @@ static inline int mls_context_cpy_high(struct context *dst, struct context *src)
return rc; return rc;
} }
static inline int mls_context_glblub(struct context *dst,
struct context *c1, struct context *c2)
{
struct mls_range *dr = &dst->range, *r1 = &c1->range, *r2 = &c2->range;
int rc = 0;
if (r1->level[1].sens < r2->level[0].sens ||
r2->level[1].sens < r1->level[0].sens)
/* These ranges have no common sensitivities */
return -EINVAL;
/* Take the greatest of the low */
dr->level[0].sens = max(r1->level[0].sens, r2->level[0].sens);
/* Take the least of the high */
dr->level[1].sens = min(r1->level[1].sens, r2->level[1].sens);
rc = ebitmap_and(&dr->level[0].cat,
&r1->level[0].cat, &r2->level[0].cat);
if (rc)
goto out;
rc = ebitmap_and(&dr->level[1].cat,
&r1->level[1].cat, &r2->level[1].cat);
if (rc)
goto out;
out:
return rc;
}
static inline int mls_context_cmp(struct context *c1, struct context *c2) static inline int mls_context_cmp(struct context *c1, struct context *c2)
{ {
return ((c1->range.level[0].sens == c2->range.level[0].sens) && return ((c1->range.level[0].sens == c2->range.level[0].sens) &&
......
...@@ -77,6 +77,24 @@ int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src) ...@@ -77,6 +77,24 @@ int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src)
return 0; return 0;
} }
int ebitmap_and(struct ebitmap *dst, struct ebitmap *e1, struct ebitmap *e2)
{
struct ebitmap_node *n;
int bit, rc;
ebitmap_init(dst);
ebitmap_for_each_positive_bit(e1, n, bit) {
if (ebitmap_get_bit(e2, bit)) {
rc = ebitmap_set_bit(dst, bit, 1);
if (rc < 0)
return rc;
}
}
return 0;
}
#ifdef CONFIG_NETLABEL #ifdef CONFIG_NETLABEL
/** /**
* ebitmap_netlbl_export - Export an ebitmap into a NetLabel category bitmap * ebitmap_netlbl_export - Export an ebitmap into a NetLabel category bitmap
......
...@@ -124,6 +124,7 @@ static inline void ebitmap_node_clr_bit(struct ebitmap_node *n, ...@@ -124,6 +124,7 @@ static inline void ebitmap_node_clr_bit(struct ebitmap_node *n,
int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2); int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2);
int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src); int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src);
int ebitmap_and(struct ebitmap *dst, struct ebitmap *e1, struct ebitmap *e2);
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2, u32 last_e2bit); int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2, u32 last_e2bit);
int ebitmap_get_bit(struct ebitmap *e, unsigned long bit); int ebitmap_get_bit(struct ebitmap *e, unsigned long bit);
int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value); int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value);
......
...@@ -529,6 +529,9 @@ int mls_compute_sid(struct policydb *p, ...@@ -529,6 +529,9 @@ int mls_compute_sid(struct policydb *p,
return mls_context_cpy_high(newcontext, tcontext); return mls_context_cpy_high(newcontext, tcontext);
case DEFAULT_TARGET_LOW_HIGH: case DEFAULT_TARGET_LOW_HIGH:
return mls_context_cpy(newcontext, tcontext); return mls_context_cpy(newcontext, tcontext);
case DEFAULT_GLBLUB:
return mls_context_glblub(newcontext,
scontext, tcontext);
} }
/* Fallthrough */ /* Fallthrough */
......
...@@ -160,6 +160,11 @@ static struct policydb_compat_info policydb_compat[] = { ...@@ -160,6 +160,11 @@ static struct policydb_compat_info policydb_compat[] = {
.sym_num = SYM_NUM, .sym_num = SYM_NUM,
.ocon_num = OCON_NUM, .ocon_num = OCON_NUM,
}, },
{
.version = POLICYDB_VERSION_GLBLUB,
.sym_num = SYM_NUM,
.ocon_num = OCON_NUM,
},
}; };
static struct policydb_compat_info *policydb_lookup_compat(int version) static struct policydb_compat_info *policydb_lookup_compat(int version)
......
...@@ -69,6 +69,7 @@ struct class_datum { ...@@ -69,6 +69,7 @@ struct class_datum {
#define DEFAULT_TARGET_LOW 4 #define DEFAULT_TARGET_LOW 4
#define DEFAULT_TARGET_HIGH 5 #define DEFAULT_TARGET_HIGH 5
#define DEFAULT_TARGET_LOW_HIGH 6 #define DEFAULT_TARGET_LOW_HIGH 6
#define DEFAULT_GLBLUB 7
char default_range; char default_range;
}; };
......
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