From: Stefan Berger <stefanb@linux.vnet.ibm.com>
To: linux-integrity@vger.kernel.org
Cc: zohar@linux.ibm.com, serge@hallyn.com,
christian.brauner@ubuntu.com, containers@lists.linux.dev,
dmitry.kasatkin@gmail.com, ebiederm@xmission.com,
krzysztof.struczynski@huawei.com, roberto.sassu@huawei.com,
mpeters@redhat.com, lhinds@redhat.com, lsturman@redhat.com,
puiterwi@redhat.com, jejb@linux.ibm.com, jamjoom@us.ibm.com,
linux-kernel@vger.kernel.org, paul@paul-moore.com,
rgb@redhat.com, linux-security-module@vger.kernel.org,
jmorris@namei.org, Stefan Berger <stefanb@linux.ibm.com>
Subject: [PATCH v9 08/23] ima: Move measurement list related variables into ima_namespace
Date: Tue, 25 Jan 2022 17:46:30 -0500 [thread overview]
Message-ID: <20220125224645.79319-9-stefanb@linux.vnet.ibm.com> (raw)
In-Reply-To: <20220125224645.79319-1-stefanb@linux.vnet.ibm.com>
From: Stefan Berger <stefanb@linux.ibm.com>
Move measurement list related variables into the ima_namespace. This way
a front-end like securityfs can show the measurement list inside an IMA
namespace.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
security/integrity/ima/ima.h | 5 +++--
security/integrity/ima/ima_fs.c | 6 ++++--
security/integrity/ima/ima_init_ima_ns.c | 5 +++++
security/integrity/ima/ima_kexec.c | 12 ++++++-----
security/integrity/ima/ima_queue.c | 27 +++++++++++-------------
5 files changed, 31 insertions(+), 24 deletions(-)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 340a59174670..45706836a77b 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -106,7 +106,6 @@ struct ima_queue_entry {
struct list_head later; /* place in ima_measurements list */
struct ima_template_entry *entry;
};
-extern struct list_head ima_measurements; /* list of all measurements */
/* Some details preceding the binary serialized measurement list */
struct ima_kexec_hdr {
@@ -136,6 +135,8 @@ struct ima_namespace {
struct ima_rule_entry *arch_policy_entry;
struct ima_h_table ima_htable;
+ struct list_head ima_measurements; /* list of all measurements */
+ unsigned long binary_runtime_size; /* used by init_ima_ns */
} __randomize_layout;
extern struct ima_namespace init_ima_ns;
@@ -186,7 +187,7 @@ int ima_restore_measurement_entry(struct ima_namespace *ns,
int ima_restore_measurement_list(struct ima_namespace *ns,
loff_t bufsize, void *buf);
int ima_measurements_show(struct seq_file *m, void *v);
-unsigned long ima_get_binary_runtime_size(void);
+unsigned long ima_get_binary_runtime_size(struct ima_namespace *ns);
int ima_init_template(void);
void ima_init_template_list(void);
int __init ima_init_digests(void);
diff --git a/security/integrity/ima/ima_fs.c b/security/integrity/ima/ima_fs.c
index 9b4dce57c1a6..b2f088dd8572 100644
--- a/security/integrity/ima/ima_fs.c
+++ b/security/integrity/ima/ima_fs.c
@@ -80,12 +80,13 @@ static const struct file_operations ima_measurements_count_ops = {
/* returns pointer to hlist_node */
static void *ima_measurements_start(struct seq_file *m, loff_t *pos)
{
+ struct ima_namespace *ns = &init_ima_ns;
loff_t l = *pos;
struct ima_queue_entry *qe;
/* we need a lock since pos could point beyond last element */
rcu_read_lock();
- list_for_each_entry_rcu(qe, &ima_measurements, later) {
+ list_for_each_entry_rcu(qe, &ns->ima_measurements, later) {
if (!l--) {
rcu_read_unlock();
return qe;
@@ -97,6 +98,7 @@ static void *ima_measurements_start(struct seq_file *m, loff_t *pos)
static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos)
{
+ struct ima_namespace *ns = &init_ima_ns;
struct ima_queue_entry *qe = v;
/* lock protects when reading beyond last element
@@ -107,7 +109,7 @@ static void *ima_measurements_next(struct seq_file *m, void *v, loff_t *pos)
rcu_read_unlock();
(*pos)++;
- return (&qe->later == &ima_measurements) ? NULL : qe;
+ return (&qe->later == &ns->ima_measurements) ? NULL : qe;
}
static void ima_measurements_stop(struct seq_file *m, void *v)
diff --git a/security/integrity/ima/ima_init_ima_ns.c b/security/integrity/ima/ima_init_ima_ns.c
index 1945fa8cfc4d..a7477072c587 100644
--- a/security/integrity/ima/ima_init_ima_ns.c
+++ b/security/integrity/ima/ima_init_ima_ns.c
@@ -20,6 +20,11 @@ static int ima_init_namespace(struct ima_namespace *ns)
atomic_long_set(&ns->ima_htable.len, 0);
atomic_long_set(&ns->ima_htable.violations, 0);
memset(&ns->ima_htable.queue, 0, sizeof(ns->ima_htable.queue));
+ INIT_LIST_HEAD(&ns->ima_measurements);
+ if (IS_ENABLED(CONFIG_IMA_KEXEC) && ns == &init_ima_ns)
+ ns->binary_runtime_size = 0;
+ else
+ ns->binary_runtime_size = ULONG_MAX;
return 0;
}
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index f3ef8a0df992..e83b18492f46 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -15,7 +15,8 @@
#include "ima.h"
#ifdef CONFIG_IMA_KEXEC
-static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
+static int ima_dump_measurement_list(struct ima_namespace *ns,
+ unsigned long *buffer_size, void **buffer,
unsigned long segment_size)
{
struct ima_queue_entry *qe;
@@ -36,7 +37,7 @@ static int ima_dump_measurement_list(unsigned long *buffer_size, void **buffer,
memset(&khdr, 0, sizeof(khdr));
khdr.version = 1;
- list_for_each_entry_rcu(qe, &ima_measurements, later) {
+ list_for_each_entry_rcu(qe, &ns->ima_measurements, later) {
if (file.count < file.size) {
khdr.count++;
ima_measurements_show(&file, qe);
@@ -84,6 +85,7 @@ void ima_add_kexec_buffer(struct kimage *image)
struct kexec_buf kbuf = { .image = image, .buf_align = PAGE_SIZE,
.buf_min = 0, .buf_max = ULONG_MAX,
.top_down = true };
+ struct ima_namespace *ns = &init_ima_ns;
unsigned long binary_runtime_size;
/* use more understandable variable names than defined in kbuf */
@@ -96,11 +98,11 @@ void ima_add_kexec_buffer(struct kimage *image)
* Reserve an extra half page of memory for additional measurements
* added during the kexec load.
*/
- binary_runtime_size = ima_get_binary_runtime_size();
+ binary_runtime_size = ima_get_binary_runtime_size(ns);
if (binary_runtime_size >= ULONG_MAX - PAGE_SIZE)
kexec_segment_size = ULONG_MAX;
else
- kexec_segment_size = ALIGN(ima_get_binary_runtime_size() +
+ kexec_segment_size = ALIGN(ima_get_binary_runtime_size(ns) +
PAGE_SIZE / 2, PAGE_SIZE);
if ((kexec_segment_size == ULONG_MAX) ||
((kexec_segment_size >> PAGE_SHIFT) > totalram_pages() / 2)) {
@@ -108,7 +110,7 @@ void ima_add_kexec_buffer(struct kimage *image)
return;
}
- ima_dump_measurement_list(&kexec_buffer_size, &kexec_buffer,
+ ima_dump_measurement_list(ns, &kexec_buffer_size, &kexec_buffer,
kexec_segment_size);
if (!kexec_buffer) {
pr_err("Not enough memory for the kexec measurement buffer.\n");
diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c
index 43961d5cd2ef..0355c2b0932c 100644
--- a/security/integrity/ima/ima_queue.c
+++ b/security/integrity/ima/ima_queue.c
@@ -24,13 +24,6 @@
/* pre-allocated array of tpm_digest structures to extend a PCR */
static struct tpm_digest *digests;
-LIST_HEAD(ima_measurements); /* list of all measurements */
-#ifdef CONFIG_IMA_KEXEC
-static unsigned long binary_runtime_size;
-#else
-static unsigned long binary_runtime_size = ULONG_MAX;
-#endif
-
/* mutex protects atomicity of extending measurement list
* and extending the TPM PCR aggregate. Since tpm_extend can take
* long (and the tpm driver uses a mutex), we can't use the spinlock.
@@ -100,7 +93,7 @@ static int ima_add_digest_entry(struct ima_namespace *ns,
qe->entry = entry;
INIT_LIST_HEAD(&qe->later);
- list_add_tail_rcu(&qe->later, &ima_measurements);
+ list_add_tail_rcu(&qe->later, &ns->ima_measurements);
atomic_long_inc(&ns->ima_htable.len);
if (update_htable) {
@@ -110,12 +103,14 @@ static int ima_add_digest_entry(struct ima_namespace *ns,
INIT_HLIST_NODE(&qe->hnext);
}
- if (binary_runtime_size != ULONG_MAX) {
+ if (ns->binary_runtime_size != ULONG_MAX) {
int size;
size = get_binary_runtime_size(entry);
- binary_runtime_size = (binary_runtime_size < ULONG_MAX - size) ?
- binary_runtime_size + size : ULONG_MAX;
+ ns->binary_runtime_size =
+ (ns->binary_runtime_size < ULONG_MAX - size)
+ ? ns->binary_runtime_size + size
+ : ULONG_MAX;
}
return 0;
}
@@ -123,14 +118,16 @@ static int ima_add_digest_entry(struct ima_namespace *ns,
/*
* Return the amount of memory required for serializing the
* entire binary_runtime_measurement list, including the ima_kexec_hdr
- * structure.
+ * structure. Carrying the measurement list across kexec is limited
+ * to init_ima_ns.
*/
-unsigned long ima_get_binary_runtime_size(void)
+unsigned long ima_get_binary_runtime_size(struct ima_namespace *ns)
{
- if (binary_runtime_size >= (ULONG_MAX - sizeof(struct ima_kexec_hdr)))
+ if (ns->binary_runtime_size >=
+ (ULONG_MAX - sizeof(struct ima_kexec_hdr)))
return ULONG_MAX;
else
- return binary_runtime_size + sizeof(struct ima_kexec_hdr);
+ return ns->binary_runtime_size + sizeof(struct ima_kexec_hdr);
}
static int ima_pcr_extend(struct tpm_digest *digests_arg, int pcr)
--
2.31.1
next prev parent reply other threads:[~2022-01-25 22:48 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-25 22:46 [PATCH v9 00/23] ima: Namespace IMA with audit support in IMA-ns Stefan Berger
2022-01-25 22:46 ` [PATCH v9 01/23] ima: Remove ima_policy file before directory Stefan Berger
2022-01-26 8:30 ` Christian Brauner
2022-01-25 22:46 ` [PATCH v9 02/23] ima: Do not print policy rule with inactive LSM labels Stefan Berger
2022-01-26 8:38 ` Christian Brauner
2022-01-27 14:12 ` Mimi Zohar
2022-01-25 22:46 ` [PATCH v9 03/23] securityfs: rework dentry creation Stefan Berger
2022-01-25 22:46 ` [PATCH v9 04/23] securityfs: Extend securityfs with namespacing support Stefan Berger
2022-01-27 16:53 ` Mimi Zohar
2022-01-31 22:28 ` Stefan Berger
2022-01-31 23:43 ` Mimi Zohar
2022-01-25 22:46 ` [PATCH v9 05/23] ima: Define ima_namespace struct and start moving variables into it Stefan Berger
2022-01-26 8:47 ` Christian Brauner
2022-01-25 22:46 ` [PATCH v9 06/23] ima: Move arch_policy_entry into ima_namespace Stefan Berger
2022-01-26 9:11 ` Christian Brauner
2022-01-27 19:42 ` Mimi Zohar
2022-01-25 22:46 ` [PATCH v9 07/23] ima: Move ima_htable " Stefan Berger
2022-01-26 9:16 ` Christian Brauner
2022-01-25 22:46 ` Stefan Berger [this message]
2022-01-26 9:21 ` [PATCH v9 08/23] ima: Move measurement list related variables " Christian Brauner
2022-01-26 22:23 ` Stefan Berger
2022-01-27 21:48 ` Mimi Zohar
2022-01-28 14:06 ` Stefan Berger
2022-01-25 22:46 ` [PATCH v9 09/23] ima: Move some IMA policy and filesystem " Stefan Berger
2022-01-26 9:23 ` Christian Brauner
2022-01-27 22:30 ` Mimi Zohar
2022-01-28 15:44 ` Stefan Berger
2022-01-28 16:03 ` Mimi Zohar
2022-01-25 22:46 ` [PATCH v9 10/23] ima: Move IMA securityfs files into ima_namespace or onto stack Stefan Berger
2022-01-26 9:40 ` Christian Brauner
2022-01-27 17:02 ` Stefan Berger
2022-01-28 3:13 ` Mimi Zohar
2022-01-25 22:46 ` [PATCH v9 11/23] ima: Move ima_lsm_policy_notifier into ima_namespace Stefan Berger
2022-01-26 13:05 ` Christian Brauner
2022-01-26 21:54 ` Stefan Berger
2022-01-25 22:46 ` [PATCH v9 12/23] ima: Define mac_admin_ns_capable() as a wrapper for ns_capable() Stefan Berger
2022-01-26 13:43 ` Christian Brauner
2022-01-25 22:46 ` [PATCH v9 13/23] ima: Only accept AUDIT rules for non-init_ima_ns namespaces for now Stefan Berger
2022-01-26 13:44 ` Christian Brauner
2022-01-25 22:46 ` [PATCH v9 14/23] userns: Add pointer to ima_namespace to user_namespace Stefan Berger
2022-01-26 14:46 ` Christian Brauner
2022-01-25 22:46 ` [PATCH v9 15/23] ima: Implement hierarchical processing of file accesses Stefan Berger
2022-01-26 12:39 ` Christian Brauner
2022-01-26 22:05 ` Stefan Berger
2022-01-25 22:46 ` [PATCH v9 16/23] ima: Implement ima_free_policy_rules() for freeing of an ima_namespace Stefan Berger
2022-01-28 14:02 ` Mimi Zohar
2022-01-31 18:56 ` Stefan Berger
2022-01-25 22:46 ` [PATCH v9 17/23] ima: Add functions for creating and " Stefan Berger
2022-01-26 13:56 ` Christian Brauner
2022-01-25 22:46 ` [PATCH v9 18/23] integrity/ima: Define ns_status for storing namespaced iint data Stefan Berger
2022-01-25 22:46 ` [PATCH v9 19/23] ima: Namespace audit status flags Stefan Berger
2022-01-25 22:46 ` [PATCH v9 20/23] ima: Setup securityfs for IMA namespace Stefan Berger
2022-01-26 14:03 ` Christian Brauner
2022-01-25 22:46 ` [PATCH v9 21/23] ima: Introduce securityfs file to activate an " Stefan Berger
2022-01-26 14:31 ` Christian Brauner
2022-01-27 15:24 ` Stefan Berger
2022-01-25 22:46 ` [PATCH v9 22/23] ima: Show owning user namespace's uid and gid when displaying policy Stefan Berger
2022-01-26 14:43 ` Christian Brauner
2022-01-26 14:43 ` Christian Brauner
2022-01-26 23:13 ` Stefan Berger
2022-01-25 22:46 ` [PATCH v9 23/23] ima: Enable IMA namespaces Stefan Berger
2022-01-26 14:57 ` Christian Brauner
2022-01-26 13:19 ` [PATCH v9 00/23] ima: Namespace IMA with audit support in IMA-ns Christian Brauner
2022-01-28 18:34 ` Stefan Berger
2022-01-26 16:52 ` Stefan Berger
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