From 2069f457848f846cb31149c9aa29b330a6b66d1b Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Fri, 4 Jul 2008 09:47:13 +1000 Subject: 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 Signed-off-by: Miklos Szeredi Signed-off-by: James Morris --- security/selinux/hooks.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 54 insertions(+), 1 deletion(-) (limited to 'security/selinux/hooks.c') diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 85f74f665765..33dee83fdd2f 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -9,7 +9,8 @@ * James Morris * * Copyright (C) 2001,2002 Networks Associates Technology, Inc. - * Copyright (C) 2003 Red Hat, Inc., James Morris + * Copyright (C) 2003-2008 Red Hat, Inc., James Morris + * Eric Paris * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. * * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. @@ -970,6 +971,57 @@ out_err: return rc; } +void selinux_write_opts(struct seq_file *m, struct security_mnt_opts *opts) +{ + int i; + char *prefix; + + for (i = 0; i < opts->num_mnt_opts; i++) { + char *has_comma = strchr(opts->mnt_opts[i], ','); + + switch (opts->mnt_opts_flags[i]) { + case CONTEXT_MNT: + prefix = CONTEXT_STR; + break; + case FSCONTEXT_MNT: + prefix = FSCONTEXT_STR; + break; + case ROOTCONTEXT_MNT: + prefix = ROOTCONTEXT_STR; + break; + case DEFCONTEXT_MNT: + prefix = DEFCONTEXT_STR; + break; + default: + BUG(); + }; + /* we need a comma before each option */ + seq_putc(m, ','); + seq_puts(m, prefix); + if (has_comma) + seq_putc(m, '\"'); + seq_puts(m, opts->mnt_opts[i]); + if (has_comma) + seq_putc(m, '\"'); + } +} + +static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) +{ + struct security_mnt_opts opts; + int rc; + + rc = selinux_get_mnt_opts(sb, &opts); + if (rc) + return rc; + + selinux_write_opts(m, &opts); + + security_free_mnt_opts(&opts); + + return rc; +} + static inline u16 inode_mode_to_security_class(umode_t mode) { switch (mode & S_IFMT) { @@ -5365,6 +5417,7 @@ static struct security_operations selinux_ops = { .sb_free_security = selinux_sb_free_security, .sb_copy_data = selinux_sb_copy_data, .sb_kern_mount = selinux_sb_kern_mount, + .sb_show_options = selinux_sb_show_options, .sb_statfs = selinux_sb_statfs, .sb_mount = selinux_mount, .sb_umount = selinux_umount, -- cgit v1.2.2