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authorDavid Howells <dhowells@redhat.com>2018-11-01 23:07:24 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2019-02-28 03:29:25 -0500
commit2febd254adc4958b2388c7a49ddc85227f41a158 (patch)
tree398ef4ff8f34dfea8bdbad444b9c2d3c823336ec /security/smack
parent442155c1bd84f82bff2d05d0ec4d0090df17ecfa (diff)
downloadlinux-2febd254adc4958b2388c7a49ddc85227f41a158.tar.gz
smack: Implement filesystem context security hooks
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>
Diffstat (limited to 'security/smack')
-rw-r--r--security/smack/smack.h19
-rw-r--r--security/smack/smack_lsm.c43
2 files changed, 47 insertions, 15 deletions
diff --git a/security/smack/smack.h b/security/smack/smack.h
index f7db791fb566..0380a9c89d3b 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -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"
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 430d4f35e55c..5f93c4f84384 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -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 @@ out_opt_err:
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),