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LSM/SELinux: show LSM mount options in /proc/mounts
This patch causes SELinux mount options to show up in /proc/mounts. As with other code in the area seq_put errors are ignored. Other LSM's will not have their mount options displayed until they fill in their own security_sb_show_options() function. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
parent
811f379927
commit
2069f45784
5 changed files with 85 additions and 4 deletions
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@ -750,7 +750,7 @@ struct proc_fs_info {
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const char *str;
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};
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static void show_sb_opts(struct seq_file *m, struct super_block *sb)
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static int show_sb_opts(struct seq_file *m, struct super_block *sb)
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{
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static const struct proc_fs_info fs_info[] = {
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{ MS_SYNCHRONOUS, ",sync" },
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@ -764,6 +764,8 @@ static void show_sb_opts(struct seq_file *m, struct super_block *sb)
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if (sb->s_flags & fs_infop->flag)
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seq_puts(m, fs_infop->str);
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}
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return security_sb_show_options(m, sb);
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}
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static void show_mnt_opts(struct seq_file *m, struct vfsmount *mnt)
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@ -806,11 +808,14 @@ static int show_vfsmnt(struct seq_file *m, void *v)
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seq_putc(m, ' ');
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show_type(m, mnt->mnt_sb);
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seq_puts(m, __mnt_is_readonly(mnt) ? " ro" : " rw");
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show_sb_opts(m, mnt->mnt_sb);
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err = show_sb_opts(m, mnt->mnt_sb);
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if (err)
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goto out;
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show_mnt_opts(m, mnt);
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if (mnt->mnt_sb->s_op->show_options)
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err = mnt->mnt_sb->s_op->show_options(m, mnt);
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seq_puts(m, " 0 0\n");
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out:
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return err;
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}
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@ -865,10 +870,13 @@ static int show_mountinfo(struct seq_file *m, void *v)
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seq_putc(m, ' ');
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mangle(m, mnt->mnt_devname ? mnt->mnt_devname : "none");
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seq_puts(m, sb->s_flags & MS_RDONLY ? " ro" : " rw");
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show_sb_opts(m, sb);
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err = show_sb_opts(m, sb);
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if (err)
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goto out;
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if (sb->s_op->show_options)
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err = sb->s_op->show_options(m, mnt);
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seq_putc(m, '\n');
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out:
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return err;
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}
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@ -80,6 +80,7 @@ struct xfrm_selector;
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struct xfrm_policy;
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struct xfrm_state;
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struct xfrm_user_sec_ctx;
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struct seq_file;
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extern int cap_netlink_send(struct sock *sk, struct sk_buff *skb);
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extern int cap_netlink_recv(struct sk_buff *skb, int cap);
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@ -1331,6 +1332,7 @@ struct security_operations {
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void (*sb_free_security) (struct super_block *sb);
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int (*sb_copy_data) (char *orig, char *copy);
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int (*sb_kern_mount) (struct super_block *sb, void *data);
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int (*sb_show_options) (struct seq_file *m, struct super_block *sb);
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int (*sb_statfs) (struct dentry *dentry);
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int (*sb_mount) (char *dev_name, struct path *path,
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char *type, unsigned long flags, void *data);
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@ -1610,6 +1612,7 @@ int security_sb_alloc(struct super_block *sb);
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void security_sb_free(struct super_block *sb);
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int security_sb_copy_data(char *orig, char *copy);
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int security_sb_kern_mount(struct super_block *sb, void *data);
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int security_sb_show_options(struct seq_file *m, struct super_block *sb);
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int security_sb_statfs(struct dentry *dentry);
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int security_sb_mount(char *dev_name, struct path *path,
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char *type, unsigned long flags, void *data);
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@ -1887,6 +1890,12 @@ static inline int security_sb_kern_mount(struct super_block *sb, void *data)
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return 0;
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}
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static inline int security_sb_show_options(struct seq_file *m,
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struct super_block *sb)
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{
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return 0;
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}
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static inline int security_sb_statfs(struct dentry *dentry)
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{
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return 0;
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@ -194,6 +194,11 @@ static int dummy_sb_kern_mount (struct super_block *sb, void *data)
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return 0;
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}
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static int dummy_sb_show_options(struct seq_file *m, struct super_block *sb)
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{
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return 0;
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}
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static int dummy_sb_statfs (struct dentry *dentry)
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{
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return 0;
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@ -1088,6 +1093,7 @@ void security_fixup_ops (struct security_operations *ops)
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set_to_dummy_if_null(ops, sb_free_security);
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set_to_dummy_if_null(ops, sb_copy_data);
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set_to_dummy_if_null(ops, sb_kern_mount);
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set_to_dummy_if_null(ops, sb_show_options);
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set_to_dummy_if_null(ops, sb_statfs);
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set_to_dummy_if_null(ops, sb_mount);
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set_to_dummy_if_null(ops, sb_check_sb);
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@ -292,6 +292,11 @@ int security_sb_kern_mount(struct super_block *sb, void *data)
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return security_ops->sb_kern_mount(sb, data);
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}
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int security_sb_show_options(struct seq_file *m, struct super_block *sb)
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{
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return security_ops->sb_show_options(m, sb);
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}
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int security_sb_statfs(struct dentry *dentry)
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{
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return security_ops->sb_statfs(dentry);
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@ -9,7 +9,8 @@
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* James Morris <jmorris@redhat.com>
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*
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* Copyright (C) 2001,2002 Networks Associates Technology, Inc.
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* Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
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* Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
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* Eric Paris <eparis@redhat.com>
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* Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
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* <dgoeddel@trustedcs.com>
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* Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
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@ -970,6 +971,57 @@ out_err:
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return rc;
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}
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void selinux_write_opts(struct seq_file *m, struct security_mnt_opts *opts)
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{
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int i;
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char *prefix;
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for (i = 0; i < opts->num_mnt_opts; i++) {
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char *has_comma = strchr(opts->mnt_opts[i], ',');
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switch (opts->mnt_opts_flags[i]) {
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case CONTEXT_MNT:
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prefix = CONTEXT_STR;
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break;
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case FSCONTEXT_MNT:
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prefix = FSCONTEXT_STR;
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break;
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case ROOTCONTEXT_MNT:
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prefix = ROOTCONTEXT_STR;
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break;
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case DEFCONTEXT_MNT:
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prefix = DEFCONTEXT_STR;
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break;
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default:
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BUG();
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};
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/* we need a comma before each option */
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seq_putc(m, ',');
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seq_puts(m, prefix);
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if (has_comma)
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seq_putc(m, '\"');
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seq_puts(m, opts->mnt_opts[i]);
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if (has_comma)
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seq_putc(m, '\"');
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}
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}
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static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
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{
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struct security_mnt_opts opts;
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int rc;
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rc = selinux_get_mnt_opts(sb, &opts);
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if (rc)
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return rc;
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selinux_write_opts(m, &opts);
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security_free_mnt_opts(&opts);
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return rc;
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}
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static inline u16 inode_mode_to_security_class(umode_t mode)
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{
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switch (mode & S_IFMT) {
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@ -5365,6 +5417,7 @@ static struct security_operations selinux_ops = {
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.sb_free_security = selinux_sb_free_security,
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.sb_copy_data = selinux_sb_copy_data,
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.sb_kern_mount = selinux_sb_kern_mount,
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.sb_show_options = selinux_sb_show_options,
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.sb_statfs = selinux_sb_statfs,
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.sb_mount = selinux_mount,
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.sb_umount = selinux_umount,
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