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Diffstat (limited to 'security/selinux/hooks.c')
-rw-r--r--security/selinux/hooks.c229
1 files changed, 155 insertions, 74 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 1d0b37af2444..c61787b15f27 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -89,6 +89,8 @@
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/bpf.h>
+#include <linux/kernfs.h>
+#include <linux/stringhash.h> /* for hashlen_string() */
#include <uapi/linux/mount.h>
#include "avc.h"
@@ -751,11 +753,13 @@ static int selinux_set_mnt_opts(struct super_block *sb,
if (!strcmp(sb->s_type->name, "debugfs") ||
!strcmp(sb->s_type->name, "tracefs") ||
- !strcmp(sb->s_type->name, "sysfs") ||
- !strcmp(sb->s_type->name, "pstore") ||
+ !strcmp(sb->s_type->name, "pstore"))
+ sbsec->flags |= SE_SBGENFS;
+
+ if (!strcmp(sb->s_type->name, "sysfs") ||
!strcmp(sb->s_type->name, "cgroup") ||
!strcmp(sb->s_type->name, "cgroup2"))
- sbsec->flags |= SE_SBGENFS;
+ sbsec->flags |= SE_SBGENFS | SE_SBGENFS_XATTR;
if (!sbsec->behavior) {
/*
@@ -1354,6 +1358,67 @@ static int selinux_genfs_get_sid(struct dentry *dentry,
return rc;
}
+static int inode_doinit_use_xattr(struct inode *inode, struct dentry *dentry,
+ u32 def_sid, u32 *sid)
+{
+#define INITCONTEXTLEN 255
+ char *context;
+ unsigned int len;
+ int rc;
+
+ len = INITCONTEXTLEN;
+ context = kmalloc(len + 1, GFP_NOFS);
+ if (!context)
+ return -ENOMEM;
+
+ context[len] = '\0';
+ rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, context, len);
+ if (rc == -ERANGE) {
+ kfree(context);
+
+ /* Need a larger buffer. Query for the right size. */
+ rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, NULL, 0);
+ if (rc < 0)
+ return rc;
+
+ len = rc;
+ context = kmalloc(len + 1, GFP_NOFS);
+ if (!context)
+ return -ENOMEM;
+
+ context[len] = '\0';
+ rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX,
+ context, len);
+ }
+ if (rc < 0) {
+ kfree(context);
+ if (rc != -ENODATA) {
+ pr_warn("SELinux: %s: getxattr returned %d for dev=%s ino=%ld\n",
+ __func__, -rc, inode->i_sb->s_id, inode->i_ino);
+ return rc;
+ }
+ *sid = def_sid;
+ return 0;
+ }
+
+ rc = security_context_to_sid_default(&selinux_state, context, rc, sid,
+ def_sid, GFP_NOFS);
+ if (rc) {
+ char *dev = inode->i_sb->s_id;
+ unsigned long ino = inode->i_ino;
+
+ if (rc == -EINVAL) {
+ pr_notice_ratelimited("SELinux: inode=%lu on dev=%s was found to have an invalid context=%s. This indicates you may need to relabel the inode or the filesystem in question.\n",
+ ino, dev, context);
+ } else {
+ pr_warn("SELinux: %s: context_to_sid(%s) returned %d for dev=%s ino=%ld\n",
+ __func__, context, -rc, dev, ino);
+ }
+ }
+ kfree(context);
+ return 0;
+}
+
/* The inode's security attributes must be initialized before first use. */
static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
{
@@ -1362,9 +1427,6 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
u32 task_sid, sid = 0;
u16 sclass;
struct dentry *dentry;
-#define INITCONTEXTLEN 255
- char *context = NULL;
- unsigned len = 0;
int rc = 0;
if (isec->initialized == LABEL_INITIALIZED)
@@ -1432,72 +1494,11 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
goto out;
}
- len = INITCONTEXTLEN;
- context = kmalloc(len+1, GFP_NOFS);
- if (!context) {
- rc = -ENOMEM;
- dput(dentry);
- goto out;
- }
- context[len] = '\0';
- rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, context, len);
- if (rc == -ERANGE) {
- kfree(context);
-
- /* Need a larger buffer. Query for the right size. */
- rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, NULL, 0);
- if (rc < 0) {
- dput(dentry);
- goto out;
- }
- len = rc;
- context = kmalloc(len+1, GFP_NOFS);
- if (!context) {
- rc = -ENOMEM;
- dput(dentry);
- goto out;
- }
- context[len] = '\0';
- rc = __vfs_getxattr(dentry, inode, XATTR_NAME_SELINUX, context, len);
- }
+ rc = inode_doinit_use_xattr(inode, dentry, sbsec->def_sid,
+ &sid);
dput(dentry);
- if (rc < 0) {
- if (rc != -ENODATA) {
- pr_warn("SELinux: %s: getxattr returned "
- "%d for dev=%s ino=%ld\n", __func__,
- -rc, inode->i_sb->s_id, inode->i_ino);
- kfree(context);
- goto out;
- }
- /* Map ENODATA to the default file SID */
- sid = sbsec->def_sid;
- rc = 0;
- } else {
- rc = security_context_to_sid_default(&selinux_state,
- context, rc, &sid,
- sbsec->def_sid,
- GFP_NOFS);
- if (rc) {
- char *dev = inode->i_sb->s_id;
- unsigned long ino = inode->i_ino;
-
- if (rc == -EINVAL) {
- if (printk_ratelimit())
- pr_notice("SELinux: inode=%lu on dev=%s was found to have an invalid "
- "context=%s. This indicates you may need to relabel the inode or the "
- "filesystem in question.\n", ino, dev, context);
- } else {
- pr_warn("SELinux: %s: context_to_sid(%s) "
- "returned %d for dev=%s ino=%ld\n",
- __func__, context, -rc, dev, ino);
- }
- kfree(context);
- /* Leave with the unlabeled SID */
- rc = 0;
- break;
- }
- }
- kfree(context);
+ if (rc)
+ goto out;
break;
case SECURITY_FS_USE_TASK:
sid = task_sid;
@@ -1548,9 +1549,21 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
goto out;
rc = selinux_genfs_get_sid(dentry, sclass,
sbsec->flags, &sid);
- dput(dentry);
- if (rc)
+ if (rc) {
+ dput(dentry);
goto out;
+ }
+
+ if ((sbsec->flags & SE_SBGENFS_XATTR) &&
+ (inode->i_opflags & IOP_XATTR)) {
+ rc = inode_doinit_use_xattr(inode, dentry,
+ sid, &sid);
+ if (rc) {
+ dput(dentry);
+ goto out;
+ }
+ }
+ dput(dentry);
}
break;
}
@@ -3371,6 +3384,67 @@ static int selinux_inode_copy_up_xattr(const char *name)
return -EOPNOTSUPP;
}
+/* kernfs node operations */
+
+static int selinux_kernfs_init_security(struct kernfs_node *kn_dir,
+ struct kernfs_node *kn)
+{
+ const struct task_security_struct *tsec = current_security();
+ u32 parent_sid, newsid, clen;
+ int rc;
+ char *context;
+
+ rc = kernfs_xattr_get(kn_dir, XATTR_NAME_SELINUX, NULL, 0);
+ if (rc == -ENODATA)
+ return 0;
+ else if (rc < 0)
+ return rc;
+
+ clen = (u32)rc;
+ context = kmalloc(clen, GFP_KERNEL);
+ if (!context)
+ return -ENOMEM;
+
+ rc = kernfs_xattr_get(kn_dir, XATTR_NAME_SELINUX, context, clen);
+ if (rc < 0) {
+ kfree(context);
+ return rc;
+ }
+
+ rc = security_context_to_sid(&selinux_state, context, clen, &parent_sid,
+ GFP_KERNEL);
+ kfree(context);
+ if (rc)
+ return rc;
+
+ if (tsec->create_sid) {
+ newsid = tsec->create_sid;
+ } else {
+ u16 secclass = inode_mode_to_security_class(kn->mode);
+ struct qstr q;
+
+ q.name = kn->name;
+ q.hash_len = hashlen_string(kn_dir, kn->name);
+
+ rc = security_transition_sid(&selinux_state, tsec->sid,
+ parent_sid, secclass, &q,
+ &newsid);
+ if (rc)
+ return rc;
+ }
+
+ rc = security_sid_to_context_force(&selinux_state, newsid,
+ &context, &clen);
+ if (rc)
+ return rc;
+
+ rc = kernfs_xattr_set(kn, XATTR_NAME_SELINUX, context, clen,
+ XATTR_CREATE);
+ kfree(context);
+ return rc;
+}
+
+
/* file security operations */
static int selinux_revalidate_file_permission(struct file *file, int mask)
@@ -4438,7 +4512,7 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
struct lsm_network_audit net = {0,};
struct sockaddr_in *addr4 = NULL;
struct sockaddr_in6 *addr6 = NULL;
- u16 family_sa = address->sa_family;
+ u16 family_sa;
unsigned short snum;
u32 sid, node_perm;
@@ -4448,6 +4522,9 @@ static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, in
* need to check address->sa_family as it is possible to have
* sk->sk_family = PF_INET6 with addr->sa_family = AF_INET.
*/
+ if (addrlen < offsetofend(struct sockaddr, sa_family))
+ return -EINVAL;
+ family_sa = address->sa_family;
switch (family_sa) {
case AF_UNSPEC:
case AF_INET:
@@ -4580,6 +4657,8 @@ static int selinux_socket_connect_helper(struct socket *sock,
* need to check address->sa_family as it is possible to have
* sk->sk_family = PF_INET6 with addr->sa_family = AF_INET.
*/
+ if (addrlen < offsetofend(struct sockaddr, sa_family))
+ return -EINVAL;
switch (address->sa_family) {
case AF_INET:
addr4 = (struct sockaddr_in *)address;
@@ -6719,6 +6798,8 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(inode_copy_up, selinux_inode_copy_up),
LSM_HOOK_INIT(inode_copy_up_xattr, selinux_inode_copy_up_xattr),
+ LSM_HOOK_INIT(kernfs_init_security, selinux_kernfs_init_security),
+
LSM_HOOK_INIT(file_permission, selinux_file_permission),
LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security),
LSM_HOOK_INIT(file_ioctl, selinux_file_ioctl),
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