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selinux: Implement the new mount API LSM hooks

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Implement the new mount API LSM hooks for SELinux.  At some point the old
hooks will need to be removed.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Paul Moore <paul@paul-moore.com>
cc: Stephen Smalley <sds@tycho.nsa.gov>
cc: selinux@tycho.nsa.gov
cc: linux-security-module@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2018-11-01 23:07:24 +00:00 committed by Al Viro
parent da2441fdff
commit 442155c1bd
2 changed files with 49 additions and 10 deletions
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49
security/selinux/hooks.c
View File

@ -48,6 +48,8 @@
#include <linux/fdtable.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/tty.h>
@ -454,11 +456,11 @@ static inline int inode_doinit(struct inode *inode)
enum {
Opt_error = -1,
Opt_context = 1,
Opt_context = 0,
Opt_defcontext = 1,
Opt_fscontext = 2,
Opt_defcontext = 3,
Opt_rootcontext = 4,
Opt_seclabel = 5,
Opt_rootcontext = 3,
Opt_seclabel = 4,
};
#define A(s, has_arg) {#s, sizeof(#s) - 1, Opt_##s, has_arg}
@ -1089,6 +1091,7 @@ static int show_sid(struct seq_file *m, u32 sid)
if (!rc) {
bool has_comma = context && strchr(context, ',');
seq_putc(m, '=');
if (has_comma)
seq_putc(m, '\"');
seq_escape(m, context, "\"\n\\");
@ -1142,7 +1145,7 @@ static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
}
if (sbsec->flags & SBLABEL_MNT) {
seq_putc(m, ',');
seq_puts(m, LABELSUPP_STR);
seq_puts(m, SECLABEL_STR);
}
return 0;
}
@ -2761,6 +2764,38 @@ static int selinux_umount(struct vfsmount *mnt, int flags)
FILESYSTEM__UNMOUNT, NULL);
}
static const struct fs_parameter_spec selinux_param_specs[] = {
fsparam_string(CONTEXT_STR, Opt_context),
fsparam_string(DEFCONTEXT_STR, Opt_defcontext),
fsparam_string(FSCONTEXT_STR, Opt_fscontext),
fsparam_string(ROOTCONTEXT_STR, Opt_rootcontext),
fsparam_flag (SECLABEL_STR, Opt_seclabel),
{}
};
static const struct fs_parameter_description selinux_fs_parameters = {
.name = "SELinux",
.specs = selinux_param_specs,
};
static int selinux_fs_context_parse_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct fs_parse_result result;
int opt, rc;
opt = fs_parse(fc, &selinux_fs_parameters, param, &result);
if (opt < 0)
return opt;
rc = selinux_add_opt(opt, param->string, &fc->security);
if (!rc) {
param->string = NULL;
rc = 1;
}
return rc;
}
/* inode security operations */
static int selinux_inode_alloc_security(struct inode *inode)
@ -6710,6 +6745,8 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(bprm_committing_creds, selinux_bprm_committing_creds),
LSM_HOOK_INIT(bprm_committed_creds, selinux_bprm_committed_creds),
LSM_HOOK_INIT(fs_context_parse_param, selinux_fs_context_parse_param),
LSM_HOOK_INIT(sb_alloc_security, selinux_sb_alloc_security),
LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security),
LSM_HOOK_INIT(sb_eat_lsm_opts, selinux_sb_eat_lsm_opts),
@ -6978,6 +7015,8 @@ static __init int selinux_init(void)
else
pr_debug("SELinux: Starting in permissive mode\n");
fs_validate_description(&selinux_fs_parameters);
return 0;
}

10
security/selinux/include/security.h
View File

@ -59,11 +59,11 @@
#define SE_SBPROC 0x0200
#define SE_SBGENFS 0x0400
#define CONTEXT_STR "context="
#define FSCONTEXT_STR "fscontext="
#define ROOTCONTEXT_STR "rootcontext="
#define DEFCONTEXT_STR "defcontext="
#define LABELSUPP_STR "seclabel"
#define CONTEXT_STR "context"
#define FSCONTEXT_STR "fscontext"
#define ROOTCONTEXT_STR "rootcontext"
#define DEFCONTEXT_STR "defcontext"
#define SECLABEL_STR "seclabel"
struct netlbl_lsm_secattr;