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smack: Implement filesystem context security hooks

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Implement filesystem context security hooks for the smack LSM.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Casey Schaufler <casey@schaufler-ca.com>
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 442155c1bd
commit 2febd254ad
2 changed files with 47 additions and 15 deletions
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19
security/smack/smack.h
View File

@ -195,22 +195,13 @@ struct smack_known_list_elem {
enum {
Opt_error = -1,
Opt_fsdefault = 1,
Opt_fsfloor = 2,
Opt_fshat = 3,
Opt_fsroot = 4,
Opt_fstransmute = 5,
Opt_fsdefault = 0,
Opt_fsfloor = 1,
Opt_fshat = 2,
Opt_fsroot = 3,
Opt_fstransmute = 4,
};
/*
* Mount options
*/
#define SMK_FSDEFAULT "smackfsdef="
#define SMK_FSFLOOR "smackfsfloor="
#define SMK_FSHAT "smackfshat="
#define SMK_FSROOT "smackfsroot="
#define SMK_FSTRANS "smackfstransmute="
#define SMACK_DELETE_OPTION "-DELETE"
#define SMACK_CIPSO_OPTION "-CIPSO"

43
security/smack/smack_lsm.c
View File

@ -43,6 +43,8 @@
#include <linux/shm.h>
#include <linux/binfmts.h>
#include <linux/parser.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include "smack.h"
#define TRANS_TRUE "TRUE"
@ -541,7 +543,6 @@ static int smack_syslog(int typefrom_file)
return rc;
}
/*
* Superblock Hooks.
*/
@ -646,6 +647,44 @@ static int smack_add_opt(int token, const char *s, void **mnt_opts)
return -EINVAL;
}
static const struct fs_parameter_spec smack_param_specs[] = {
fsparam_string("fsdefault", Opt_fsdefault),
fsparam_string("fsfloor", Opt_fsfloor),
fsparam_string("fshat", Opt_fshat),
fsparam_string("fsroot", Opt_fsroot),
fsparam_string("fstransmute", Opt_fstransmute),
{}
};
static const struct fs_parameter_description smack_fs_parameters = {
.name = "smack",
.specs = smack_param_specs,
};
/**
* smack_fs_context_parse_param - Parse a single mount parameter
* @fc: The new filesystem context being constructed.
* @param: The parameter.
*
* Returns 0 on success, -ENOPARAM to pass the parameter on or anything else on
* error.
*/
static int smack_fs_context_parse_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct fs_parse_result result;
int opt, rc;
opt = fs_parse(fc, &smack_fs_parameters, param, &result);
if (opt < 0)
return opt;
rc = smack_add_opt(opt, param->string, &fc->security);
if (!rc)
param->string = NULL;
return rc;
}
static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts)
{
char *from = options, *to = options;
@ -4587,6 +4626,8 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
LSM_HOOK_INIT(syslog, smack_syslog),
LSM_HOOK_INIT(fs_context_parse_param, smack_fs_context_parse_param),
LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
LSM_HOOK_INIT(sb_free_mnt_opts, smack_free_mnt_opts),