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authorJames Carter <jwcart2@tycho.nsa.gov>2007-04-04 10:11:29 -0400
committerJames Morris <jmorris@namei.org>2007-04-26 01:36:00 -0400
commitf0ee2e467ffa68c3122128b704c1540ee294b748 (patch)
tree1fb9bf27386233b88406b50ff69b83a2c9cdbe38 /security
parenta764ae4b0781fac75f9657bc737c37ae59888389 (diff)
downloadlinux-2.6.34-ux500-f0ee2e467ffa68c3122128b704c1540ee294b748.tar.gz
selinux: export initial SID contexts via selinuxfs
Make the initial SID contexts accessible to userspace via selinuxfs. An initial use of this support will be to make the unlabeled context available to libselinux for use for invalidated userspace SIDs. Signed-off-by: James Carter <jwcart2@tycho.nsa.gov> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/include/security.h2
-rw-r--r--security/selinux/selinuxfs.c67
-rw-r--r--security/selinux/ss/services.c7
3 files changed, 76 insertions, 0 deletions
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index bfe562c3646..b94378afea2 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -123,5 +123,7 @@ static inline int security_netlbl_sid_to_secattr(u32 sid,
}
#endif /* CONFIG_NETLABEL */
+const char *security_get_initial_sid_context(u32 sid);
+
#endif /* _SELINUX_SECURITY_H_ */
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 93b3177c758..e24235c59dd 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -102,6 +102,9 @@ enum sel_inos {
SEL_COMPAT_NET, /* whether to use old compat network packet controls */
};
+#define SEL_INITCON_INO_OFFSET 0x01000000
+#define SEL_INO_MASK 0x00ffffff
+
#define TMPBUFLEN 12
static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
size_t count, loff_t *ppos)
@@ -1240,6 +1243,55 @@ out:
return ret;
}
+static ssize_t sel_read_initcon(struct file * file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct inode *inode;
+ char *con;
+ u32 sid, len;
+ ssize_t ret;
+
+ inode = file->f_path.dentry->d_inode;
+ sid = inode->i_ino&SEL_INO_MASK;
+ ret = security_sid_to_context(sid, &con, &len);
+ if (ret < 0)
+ return ret;
+
+ ret = simple_read_from_buffer(buf, count, ppos, con, len);
+ kfree(con);
+ return ret;
+}
+
+static const struct file_operations sel_initcon_ops = {
+ .read = sel_read_initcon,
+};
+
+static int sel_make_initcon_files(struct dentry *dir)
+{
+ int i, ret = 0;
+
+ for (i = 1; i <= SECINITSID_NUM; i++) {
+ struct inode *inode;
+ struct dentry *dentry;
+ dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
+ if (!dentry) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
+ if (!inode) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ inode->i_fop = &sel_initcon_ops;
+ inode->i_ino = i|SEL_INITCON_INO_OFFSET;
+ d_add(dentry, inode);
+ }
+out:
+ return ret;
+}
+
static int sel_make_dir(struct inode *dir, struct dentry *dentry)
{
int ret = 0;
@@ -1336,6 +1388,21 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent)
ret = sel_make_avc_files(dentry);
if (ret)
goto err;
+
+ dentry = d_alloc_name(sb->s_root, "initial_contexts");
+ if (!dentry) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = sel_make_dir(root_inode, dentry);
+ if (ret)
+ goto err;
+
+ ret = sel_make_initcon_files(dentry);
+ if (ret)
+ goto err;
+
out:
return ret;
err:
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index d3698568a21..21b8318979e 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -593,6 +593,13 @@ static int context_struct_to_string(struct context *context, char **scontext, u3
#include "initial_sid_to_string.h"
+const char *security_get_initial_sid_context(u32 sid)
+{
+ if (unlikely(sid > SECINITSID_NUM))
+ return NULL;
+ return initial_sid_to_string[sid];
+}
+
/**
* security_sid_to_context - Obtain a context for a given SID.
* @sid: security identifier, SID