* [PATCH v8 0/3] mm: LSM: ro protection for dynamic data
@ 2017-06-27 17:33 Igor Stoppa
2017-06-27 17:33 ` [PATCH 1/3] Protectable memory support Igor Stoppa
` (2 more replies)
0 siblings, 3 replies; 10+ messages in thread
From: Igor Stoppa @ 2017-06-27 17:33 UTC (permalink / raw)
To: keescook, mhocko, jmorris
Cc: penguin-kernel, paul, sds, casey, hch, labbott,
linux-security-module, linux-mm, linux-kernel, kernel-hardening,
Igor Stoppa
Hi,
please consider this patch-set for inclusion.
This patch-set introduces the possibility of protecting memory that has
been allocated dynamically.
The memory is managed in pools: when a pool is made R/O, all the memory
that is part of it, will become R/O.
A R/O pool can be destroyed, to recover its memory, but it cannot be
turned back into R/W mode.
This is intentional. This feature is meant for data that doesn't need
further modifications after initialization.
An example is provided, showing how to turn into a boot-time option the
writable state of the security hooks.
Prior to this patch, it was a compile-time option.
This is made possible, thanks to Tetsuo Handa's rework of the hooks
structure (included in the patchset).
Changes since the v6 version:
- complete rewrite, using the genalloc lib (suggested by Laura Abbott)
- added sysfs interface for tracking of active pools
Changes since the v7 version:
- replaced the use of devices with kobjects for showing info on sysfs
The only question still open is if there should be a possibility for
unprotecting a memory pool in other cases than destruction.
The only cases found for this topic are:
- protecting the LSM header structure between creation and insertion of a
security module that was not built as part of the kernel
(but the module can protect the headers after it has loaded)
- unloading SELinux from RedHat, if the system has booted, but no policy
has been loaded yet - this feature is going away, according to Casey.
Note:
The patch is larg-ish, but I was not sure what criteria to use for
splitting it.
If it helps the reviewing, please do let me know how I should split it
and I will comply.
Igor Stoppa (2):
Protectable memory support
Make LSM Writable Hooks a command line option
Tetsuo Handa (1):
LSM: Convert security_hook_heads into explicit array of struct
list_head
arch/Kconfig | 1 +
include/linux/lsm_hooks.h | 420 ++++++++++++++++++++---------------------
include/linux/page-flags.h | 2 +
include/linux/pmalloc.h | 111 +++++++++++
include/trace/events/mmflags.h | 1 +
init/main.c | 2 +
lib/Kconfig | 1 +
lib/genalloc.c | 4 +-
mm/Makefile | 1 +
mm/pmalloc.c | 341 +++++++++++++++++++++++++++++++++
mm/usercopy.c | 24 ++-
security/security.c | 49 +++--
12 files changed, 721 insertions(+), 236 deletions(-)
create mode 100644 include/linux/pmalloc.h
create mode 100644 mm/pmalloc.c
--
2.9.3
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^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH 1/3] Protectable memory support
2017-06-27 17:33 [PATCH v8 0/3] mm: LSM: ro protection for dynamic data Igor Stoppa
@ 2017-06-27 17:33 ` Igor Stoppa
2017-06-27 17:33 ` [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head Igor Stoppa
2017-06-27 17:33 ` [PATCH 3/3] Make LSM Writable Hooks a command line option Igor Stoppa
2 siblings, 0 replies; 10+ messages in thread
From: Igor Stoppa @ 2017-06-27 17:33 UTC (permalink / raw)
To: keescook, mhocko, jmorris
Cc: penguin-kernel, paul, sds, casey, hch, labbott,
linux-security-module, linux-mm, linux-kernel, kernel-hardening,
Igor Stoppa, Igor Stoppa
From: Igor Stoppa <igor.stoppa@gmail.com>
The MMU available in many systems running Linux can often provide R/O
protection to the memory pages it handles.
However, the MMU-based protection works efficiently only when said pages
contain exclusively data that will not need further modifications.
Statically allocated variables can be segregated into a dedicated
section, but this does not sit very well with dynamically allocated ones.
Dynamic allocation does not provide, currently, any means for grouping
variables in memory pages that would contain exclusively data suitable
for conversion to read only access mode.
The allocator here provided (pmalloc - protectable memory allocator)
introduces the concept of pools of protectable memory.
A module can request a pool and then refer any allocation request to the
pool handler it has received.
Once all the chunks of memory associated to a specific pool are
initialized, the pool can be protected.
After this point, the pool can only be destroyed (it is up to the module
to avoid any further references to the memory from the pool, after
the destruction is invoked).
The latter case is mainly meant for releasing memory, when a module is
unloaded.
A module can have as many pools as needed, for example to support the
protection of data that is initialized in sufficiently distinct phases.
Signed-off-by: Igor Stoppa <igor.stoppa@huawei.com>
---
arch/Kconfig | 1 +
include/linux/page-flags.h | 2 +
include/linux/pmalloc.h | 111 ++++++++++++++
include/trace/events/mmflags.h | 1 +
init/main.c | 2 +
lib/Kconfig | 1 +
lib/genalloc.c | 4 +-
mm/Makefile | 1 +
mm/pmalloc.c | 341 +++++++++++++++++++++++++++++++++++++++++
mm/usercopy.c | 24 +--
10 files changed, 477 insertions(+), 11 deletions(-)
create mode 100644 include/linux/pmalloc.h
create mode 100644 mm/pmalloc.c
diff --git a/arch/Kconfig b/arch/Kconfig
index 6c00e5b..9d16b51 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -228,6 +228,7 @@ config GENERIC_IDLE_POLL_SETUP
# Select if arch has all set_memory_ro/rw/x/nx() functions in asm/cacheflush.h
config ARCH_HAS_SET_MEMORY
+ select GENERIC_ALLOCATOR
bool
# Select if arch init_task initializer is different to init/init_task.c
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 6b5818d..acc0723 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -81,6 +81,7 @@ enum pageflags {
PG_active,
PG_waiters, /* Page has waiters, check its waitqueue. Must be bit #7 and in the same byte as "PG_locked" */
PG_slab,
+ PG_pmalloc,
PG_owner_priv_1, /* Owner use. If pagecache, fs may use*/
PG_arch_1,
PG_reserved,
@@ -274,6 +275,7 @@ PAGEFLAG(Active, active, PF_HEAD) __CLEARPAGEFLAG(Active, active, PF_HEAD)
TESTCLEARFLAG(Active, active, PF_HEAD)
__PAGEFLAG(Slab, slab, PF_NO_TAIL)
__PAGEFLAG(SlobFree, slob_free, PF_NO_TAIL)
+__PAGEFLAG(Pmalloc, pmalloc, PF_NO_TAIL)
PAGEFLAG(Checked, checked, PF_NO_COMPOUND) /* Used by some filesystems */
/* Xen */
diff --git a/include/linux/pmalloc.h b/include/linux/pmalloc.h
new file mode 100644
index 0000000..0d65f83
--- /dev/null
+++ b/include/linux/pmalloc.h
@@ -0,0 +1,111 @@
+/*
+ * pmalloc.h: Header for Protectable Memory Allocator
+ *
+ * (C) Copyright 2017 Huawei Technologies Co. Ltd.
+ * Author: Igor Stoppa <igor.stoppa@huawei.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+#ifndef _PMALLOC_H
+#define _PMALLOC_H
+#include <linux/genalloc.h>
+
+#define PMALLOC_DEFAULT_ALLOC_ORDER (-1)
+
+/**
+ * pmalloc_create_pool - create a new protectable memory pool -
+ * @name: the name of the pool, must be unique
+ * @min_alloc_order: log2 of the minimum allocation size obtainable
+ * from the pool
+ *
+ * Creates a new (empty) memory pool for allocation of protectable
+ * memory. Memory will be allocated upon request (through pmalloc).
+ *
+ * Returns a pointer to the new pool, upon succes, otherwise a NULL.
+ */
+struct gen_pool *pmalloc_create_pool(const char *name,
+ int min_alloc_order);
+
+
+/**
+ * pmalloc_get_pool - get a pool handler, from its name
+ * @name: the name of the pool sought after.
+ *
+ * Returns a pointer to the pool, upon succes, otherwise a NULL.
+ */
+struct gen_pool *pmalloc_get_pool(const char *name);
+
+
+
+/**
+ * pmalloc - allocate protectable memory from a pool
+ * @pool: handler to the pool to be used for memory allocation
+ * @size: amount of memory (in bytes) requested
+ *
+ * Allocates memory from an unprotected pool. If the pool doesn't have
+ * enough memory, an attempt is made to add to the pool a new chunk of
+ * memory (multiple of PAGE_SIZE) that can fit the new request.
+ *
+ * Returns the pointer to the memory requested, upon success,
+ * NULL otherwise (either no memory availabel or pool RO).
+ */
+void *pmalloc(struct gen_pool *pool, size_t size);
+
+
+
+/**
+ * pmalloc_free - release memory previously obtained through pmalloc
+ * @pool: the pool providing the memory
+ * @addr: the memory address obtained from pmalloc
+ * @size: the same amount of memory that was requested from pmalloc
+ *
+ * Releases the memory that was previously accounted for as in use.
+ * It works also on pocked pools, but the memory released is simply
+ * removed from the refcount of memory in use. It cannot be re-used.
+ */
+static __always_inline
+void pmalloc_free(struct gen_pool *pool, void *addr, size_t size)
+{
+ gen_pool_free(pool, (unsigned long)addr, size);
+}
+
+
+
+/**
+ * pmalloc_protect_pool - turn a RW pool into RO
+ * @pool: the pool to protect
+ *
+ * Write protects all the memory chunks assigned to the pool.
+ * This prevents further allocation.
+ *
+ * Returns 0 upon success, -EINVAL in abnormal cases.
+ */
+int pmalloc_protect_pool(struct gen_pool *pool);
+
+
+
+/**
+ * pmalloc_pool_protected - check if the pool is protected
+ * @pool: the pool to test
+ *
+ * Returns true if the pool is either protected or missing. False otherwise.
+ */
+bool pmalloc_pool_protected(struct gen_pool *pool);
+
+
+
+/**
+ * pmalloc_destroy_pool - destroys a pool and all the associated memory
+ * @pool: the pool to destroy
+ *
+ * All the memory that was allocated through pmalloc must first be freed
+ * with pmalloc_free. Falire to do so will BUG().
+ *
+ * Returns 0 upon success, -EINVAL in abnormal cases.
+ */
+int pmalloc_destroy_pool(struct gen_pool *pool);
+#endif
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index 304ff94..41d1587 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -91,6 +91,7 @@
{1UL << PG_lru, "lru" }, \
{1UL << PG_active, "active" }, \
{1UL << PG_slab, "slab" }, \
+ {1UL << PG_pmalloc, "pmalloc" }, \
{1UL << PG_owner_priv_1, "owner_priv_1" }, \
{1UL << PG_arch_1, "arch_1" }, \
{1UL << PG_reserved, "reserved" }, \
diff --git a/init/main.c b/init/main.c
index f866510..a703c9c 100644
--- a/init/main.c
+++ b/init/main.c
@@ -100,6 +100,7 @@ static int kernel_init(void *);
extern void init_IRQ(void);
extern void fork_init(void);
extern void radix_tree_init(void);
+int __init pmalloc_init(void);
/*
* Debug helper: via this flag we know that we are in 'early bootup code'
@@ -653,6 +654,7 @@ asmlinkage __visible void __init start_kernel(void)
proc_caches_init();
buffer_init();
key_init();
+ pmalloc_init();
security_init();
dbg_late_init();
vfs_caches_init();
diff --git a/lib/Kconfig b/lib/Kconfig
index 0c8b78a..3e3b8f6 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -270,6 +270,7 @@ config DECOMPRESS_LZ4
# Generic allocator support is selected if needed
#
config GENERIC_ALLOCATOR
+ depends on ARCH_HAS_SET_MEMORY
bool
#
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 144fe6b..52165bb 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -648,12 +648,12 @@ unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
}
EXPORT_SYMBOL(gen_pool_best_fit);
-static void devm_gen_pool_release(struct device *dev, void *res)
+void devm_gen_pool_release(struct device *dev, void *res)
{
gen_pool_destroy(*(struct gen_pool **)res);
}
-static int devm_gen_pool_match(struct device *dev, void *res, void *data)
+int devm_gen_pool_match(struct device *dev, void *res, void *data)
{
struct gen_pool **p = res;
diff --git a/mm/Makefile b/mm/Makefile
index 026f6a8..b47dcf8 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_SPARSEMEM) += sparse.o
obj-$(CONFIG_SPARSEMEM_VMEMMAP) += sparse-vmemmap.o
obj-$(CONFIG_SLOB) += slob.o
obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
+obj-$(CONFIG_ARCH_HAS_SET_MEMORY) += pmalloc.o
obj-$(CONFIG_KSM) += ksm.o
obj-$(CONFIG_PAGE_POISONING) += page_poison.o
obj-$(CONFIG_SLAB) += slab.o
diff --git a/mm/pmalloc.c b/mm/pmalloc.c
new file mode 100644
index 0000000..cb56ae3
--- /dev/null
+++ b/mm/pmalloc.c
@@ -0,0 +1,341 @@
+/*
+ * pmalloc.c: Protectable Memory Allocator
+ *
+ * (C) Copyright 2017 Huawei Technologies Co. Ltd.
+ * Author: Igor Stoppa <igor.stoppa@huawei.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ */
+
+#include <linux/printk.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/genalloc.h>
+#include <linux/kernel.h>
+#include <linux/log2.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/atomic.h>
+#include <linux/rculist.h>
+#include <asm/set_memory.h>
+#include <asm/page.h>
+
+#include <linux/debugfs.h>
+#include <linux/kallsyms.h>
+
+
+/**
+ * pmalloc_data contains the data specific to a pmalloc pool,
+ * in a format compatible with the design of gen_alloc.
+ * Some of the fields are used for exposing the corresponding parameter
+ * to userspace, through sysfs.
+ */
+struct pmalloc_data {
+ struct gen_pool *pool; /* Link back to the associated pool. */
+ atomic_t protected; /* Status of the pool: RO or RW. */
+ atomic_t processed; /* Is the pool already in sysfs? */
+ struct kobj_attribute attr_protected; /* Sysfs attribute. */
+ struct kobj_attribute attr_avail; /* Sysfs attribute. */
+ struct kobj_attribute attr_size; /* Sysfs attribute. */
+ struct kobject *pool_kobject;
+};
+
+/**
+ * Keeps track of the safe point, where operatioms according to the normal
+ * device model are supported. Before this point, such operation are not
+ * available.
+ */
+static atomic_t into_post_init;
+
+static struct device pmalloc_dev;
+static struct kobject *pmalloc_kobject;
+
+static ssize_t __pmalloc_pool_show_protected(struct kobject *dev,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ struct pmalloc_data *data;
+
+ data = container_of(attr, struct pmalloc_data, attr_protected);
+ if (atomic_read(&data->protected))
+ return sprintf(buf, "protected\n");
+ else
+ return sprintf(buf, "unprotected\n");
+}
+
+static ssize_t __pmalloc_pool_show_avail(struct kobject *dev,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ struct pmalloc_data *data;
+
+ data = container_of(attr, struct pmalloc_data, attr_avail);
+ return sprintf(buf, "%lu\n", gen_pool_avail(data->pool));
+}
+
+static ssize_t __pmalloc_pool_show_size(struct kobject *dev,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ struct pmalloc_data *data;
+
+ data = container_of(attr, struct pmalloc_data, attr_size);
+ return sprintf(buf, "%lu\n", gen_pool_size(data->pool));
+}
+
+/**
+ * Exposes the pool and its attributes through sysfs.
+ */
+static void __pmalloc_connect(struct pmalloc_data *data)
+{
+ kobject_add(data->pool_kobject, pmalloc_kobject, "%s",
+ kobject_name(data->pool_kobject));
+ sysfs_create_file(data->pool_kobject, &data->attr_protected.attr);
+ sysfs_create_file(data->pool_kobject, &data->attr_avail.attr);
+ sysfs_create_file(data->pool_kobject, &data->attr_size.attr);
+}
+
+/**
+ * Removes the pool and its attributes from sysfs.
+ */
+static void __pmalloc_disconnect(struct pmalloc_data *data)
+{
+ sysfs_remove_file(data->pool_kobject, &data->attr_protected.attr);
+ sysfs_remove_file(data->pool_kobject, &data->attr_avail.attr);
+ sysfs_remove_file(data->pool_kobject, &data->attr_size.attr);
+ kobject_put(data->pool_kobject);
+}
+
+/**
+ * Declares an attribute of the pool.
+ */
+#define __pmalloc_attr_init(data, attr_name) \
+{ \
+ data->attr_##attr_name.attr.name = #attr_name; \
+ data->attr_##attr_name.attr.mode = VERIFY_OCTAL_PERMISSIONS(0444); \
+ data->attr_##attr_name.show = __pmalloc_pool_show_##attr_name; \
+}
+
+struct gen_pool *pmalloc_create_pool(const char *name,
+ int min_alloc_order)
+{
+ struct gen_pool *pool;
+ struct pmalloc_data *data;
+
+ data = kzalloc(sizeof(struct pmalloc_data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+ if (min_alloc_order < 0)
+ min_alloc_order = ilog2(sizeof(unsigned long));
+ pool = devm_gen_pool_create(&pmalloc_dev, min_alloc_order,
+ -1, name);
+ if (!pool) {
+ kfree(data);
+ return NULL;
+ }
+ atomic_set(&data->protected, false);
+ atomic_set(&data->processed, atomic_read(&into_post_init));
+ data->pool = pool;
+ __pmalloc_attr_init(data, protected);
+ __pmalloc_attr_init(data, avail);
+ __pmalloc_attr_init(data, size);
+ data->pool_kobject = kobject_create();
+ BUG_ON(!data->pool_kobject);
+ kobject_set_name(data->pool_kobject, "%s", name);
+ if (atomic_read(&data->processed)) /* Check sysfs availability. */
+ __pmalloc_connect(data); /* After late init. */
+ pool->data = data;
+ return pool;
+}
+
+
+struct gen_pool *pmalloc_get_pool(const char *name)
+{
+ return gen_pool_get(&pmalloc_dev, name);
+}
+
+
+/**
+ * To support hardened usercopy, tag/untag pages supplied by pmalloc.
+ * Pages are tagged when added to a pool and untagged when removed
+ * from said pool.
+ */
+#define PMALLOC_TAG_PAGE true
+#define PMALLOC_UNTAG_PAGE false
+static inline
+int __pmalloc_tag_pages(void *base, const size_t size, const bool set_tag)
+{
+ void *end = base + size - 1;
+
+ do {
+ struct page *page;
+
+ if (!is_vmalloc_addr(base))
+ return -EINVAL;
+ page = vmalloc_to_page(base);
+ if (set_tag)
+ __SetPagePmalloc(page);
+ else
+ __ClearPagePmalloc(page);
+ base += PAGE_SIZE;
+ } while ((PAGE_MASK & (unsigned long)base) <=
+ (PAGE_MASK & (unsigned long)end));
+ return 0;
+}
+
+
+static void __page_untag(struct gen_pool *pool,
+ struct gen_pool_chunk *chunk, void *data)
+{
+ __pmalloc_tag_pages((void *)chunk->start_addr,
+ chunk->end_addr - chunk->start_addr + 1,
+ PMALLOC_UNTAG_PAGE);
+}
+
+void *pmalloc(struct gen_pool *pool, size_t size)
+{
+ void *retval, *chunk;
+ size_t chunk_size;
+
+ if (!size || !pool ||
+ atomic_read(&((struct pmalloc_data *)pool->data)->protected))
+ return NULL;
+ retval = (void *)gen_pool_alloc(pool, size);
+ if (retval)
+ return retval;
+ chunk_size = roundup(size, PAGE_SIZE);
+ chunk = vmalloc(chunk_size);
+ if (!chunk)
+ return NULL;
+ __pmalloc_tag_pages(chunk, size, PMALLOC_TAG_PAGE);
+ BUG_ON(gen_pool_add_virt(pool, (unsigned long)chunk,
+ (phys_addr_t)NULL, chunk_size, -1));
+ return (void *)gen_pool_alloc(pool, size);
+}
+
+static void __page_protection(struct gen_pool *pool,
+ struct gen_pool_chunk *chunk, void *data)
+{
+ unsigned long pages;
+
+ if (!data)
+ return;
+ pages = roundup(chunk->end_addr - chunk->start_addr + 1,
+ PAGE_SIZE) / PAGE_SIZE;
+ if (*(bool *)data)
+ set_memory_ro(chunk->start_addr, pages);
+ else
+ set_memory_rw(chunk->start_addr, pages);
+}
+
+static int __pmalloc_pool_protection(struct gen_pool *pool, bool protection)
+{
+ if (!pool)
+ return -EINVAL;
+ BUG_ON(atomic_read(&((struct pmalloc_data *)pool->data)->protected)
+ == protection);
+ atomic_set(&((struct pmalloc_data *)pool->data)->protected, protection);
+ gen_pool_for_each_chunk(pool, __page_protection, &protection);
+ return 0;
+}
+
+int pmalloc_protect_pool(struct gen_pool *pool)
+{
+ return __pmalloc_pool_protection(pool, true);
+}
+
+
+bool pmalloc_pool_protected(struct gen_pool *pool)
+{
+ if (!pool)
+ return true;
+ return atomic_read(&(((struct pmalloc_data *)pool->data)->protected));
+}
+
+
+void devm_gen_pool_release(struct device *dev, void *res);
+int devm_gen_pool_match(struct device *dev, void *res, void *data);
+
+int pmalloc_destroy_pool(struct gen_pool *pool)
+{
+ struct gen_pool **p;
+ struct pmalloc_data *data;
+
+ data = (struct pmalloc_data *)pool->data;
+ p = devres_find(&pmalloc_dev, devm_gen_pool_release,
+ devm_gen_pool_match, (void *)pool->name);
+ if (!p)
+ return -EINVAL;
+ __pmalloc_pool_protection(pool, false);
+ gen_pool_for_each_chunk(pool, __page_untag, NULL);
+ devm_gen_pool_release(&pmalloc_dev, p);
+ __pmalloc_disconnect(data);
+ kfree(data);
+ return 0;
+}
+
+static const char msg[] = "Not a valid Pmalloc object.";
+const char *__pmalloc_check_object(const void *ptr, unsigned long n)
+{
+ unsigned long p;
+
+ p = (unsigned long)ptr;
+ n = p + n - 1;
+ for (; (PAGE_MASK & p) <= (PAGE_MASK & n); p += PAGE_SIZE) {
+ struct page *page;
+
+ if (!is_vmalloc_addr((void *)p))
+ return msg;
+ page = vmalloc_to_page((void *)p);
+ if (!(page && PagePmalloc(page)))
+ return msg;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(__pmalloc_check_object);
+
+
+/**
+ * Early init function, the main purpose is to create the device used
+ * in conjunction with genalloc, to track the pools as resources.
+ * It cannot register the device because it is called very early in the
+ * boot sequence and the sysfs is not yet fully initialized.
+ */
+int __init pmalloc_init(void)
+{
+ device_initialize(&pmalloc_dev);
+ dev_set_name(&pmalloc_dev, "%s", "pmalloc");
+ atomic_set(&into_post_init, false);
+ return 0;
+}
+
+static void __pmalloc_late_add(struct device *dev, void *pool_ptr, void *d)
+{
+ struct pmalloc_data *data;
+
+ data = (*(struct gen_pool **)pool_ptr)->data;
+ if (!atomic_read(&data->processed)) {
+ atomic_set(&data->processed, true);
+ __pmalloc_connect(data);
+ }
+}
+
+
+/**
+ * When the sysfs is ready for recieving registrations, connect all the
+ * pools previously created. Also enable further pools to be connected
+ * right away.
+ */
+static int __init pmalloc_late_init(void)
+{
+ pmalloc_kobject = kobject_create_and_add("pmalloc", kernel_kobj);
+ atomic_set(&into_post_init, true);
+ devres_for_each_res(&pmalloc_dev, devm_gen_pool_release,
+ NULL, NULL, __pmalloc_late_add, NULL);
+ return 0;
+}
+late_initcall(pmalloc_late_init);
diff --git a/mm/usercopy.c b/mm/usercopy.c
index a9852b2..29bb691 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -195,22 +195,28 @@ static inline const char *check_page_span(const void *ptr, unsigned long n,
return NULL;
}
+extern const char *__pmalloc_check_object(const void *ptr, unsigned long n);
+
static inline const char *check_heap_object(const void *ptr, unsigned long n,
bool to_user)
{
struct page *page;
- if (!virt_addr_valid(ptr))
- return NULL;
-
- page = virt_to_head_page(ptr);
-
- /* Check slab allocator for flags and size. */
- if (PageSlab(page))
- return __check_heap_object(ptr, n, page);
+ if (virt_addr_valid(ptr)) {
+ page = virt_to_head_page(ptr);
+ /* Check slab allocator for flags and size. */
+ if (PageSlab(page))
+ return __check_heap_object(ptr, n, page);
/* Verify object does not incorrectly span multiple pages. */
- return check_page_span(ptr, n, page, to_user);
+ return check_page_span(ptr, n, page, to_user);
+ }
+ if (likely(is_vmalloc_addr(ptr))) {
+ page = vmalloc_to_page(ptr);
+ if (unlikely(page && PagePmalloc(page)))
+ return __pmalloc_check_object(ptr, n);
+ }
+ return NULL;
}
/*
--
2.9.3
--
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^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head
2017-06-27 17:33 [PATCH v8 0/3] mm: LSM: ro protection for dynamic data Igor Stoppa
2017-06-27 17:33 ` [PATCH 1/3] Protectable memory support Igor Stoppa
@ 2017-06-27 17:33 ` Igor Stoppa
2017-06-27 17:33 ` [PATCH 3/3] Make LSM Writable Hooks a command line option Igor Stoppa
2 siblings, 0 replies; 10+ messages in thread
From: Igor Stoppa @ 2017-06-27 17:33 UTC (permalink / raw)
To: keescook, mhocko, jmorris
Cc: penguin-kernel, paul, sds, casey, hch, labbott,
linux-security-module, linux-mm, linux-kernel, kernel-hardening,
James Morris, Igor Stoppa
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Commit 3dfc9b02864b19f4 ("LSM: Initialize security_hook_heads upon
registration.") treats "struct security_hook_heads" as an implicit array
of "struct list_head" so that we can eliminate code for static
initialization. Although we haven't encountered compilers which do not
treat sizeof(security_hook_heads) != sizeof(struct list_head) *
(sizeof(security_hook_heads) / sizeof(struct list_head)), Casey does not
like the assumption that a structure of N elements can be assumed to be
the same as an array of N elements.
Now that Kees found that randstruct complains about such casting
security/security.c: In function 'security_init':
security/security.c:59:20: note: found mismatched op0 struct pointer
types: 'struct list_head' and 'struct security_hook_heads'
struct list_head *list = (struct list_head *) &security_hook_heads;
and Christoph thinks that we should fix it rather than make randstruct
whitelist it, this patch fixes it.
It would be possible to revert commit 3dfc9b02864b19f4, but this patch
converts security_hook_heads into an explicit array of struct list_head
by introducing an enum, due to reasons explained below.
Igor proposed a sealable memory allocator, and the LSM hooks
("struct security_hook_heads security_hook_heads" and
"struct security_hook_list ...[]") will benefit from that allocator via
protection using set_memory_ro()/set_memory_rw(), and that allocator
will remove CONFIG_SECURITY_WRITABLE_HOOKS config option. Thus, we will
likely be moving to that direction.
This means that these structures will be allocated at run time using
that allocator, and therefore the address of these structures will be
determined at run time rather than compile time.
But currently, LSM_HOOK_INIT() macro depends on the address of
security_hook_heads being known at compile time. If we use an enum
so that LSM_HOOK_INIT() macro does not need to know absolute address of
security_hook_heads, it will help us to use that allocator for LSM hooks.
As a result of introducing an enum, security_hook_heads becomes a local
variable. In order to pass 80 columns check by scripts/checkpatch.pl ,
rename security_hook_heads to hook_heads.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Rebased-by: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Christoph Hellwig <hch@infradead.org>
---
include/linux/lsm_hooks.h | 420 +++++++++++++++++++++++-----------------------
security/security.c | 31 ++--
2 files changed, 227 insertions(+), 224 deletions(-)
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 3cc9d77..32f30fa 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1694,225 +1694,226 @@ union security_list_options {
#endif /* CONFIG_AUDIT */
};
-struct security_hook_heads {
- struct list_head binder_set_context_mgr;
- struct list_head binder_transaction;
- struct list_head binder_transfer_binder;
- struct list_head binder_transfer_file;
- struct list_head ptrace_access_check;
- struct list_head ptrace_traceme;
- struct list_head capget;
- struct list_head capset;
- struct list_head capable;
- struct list_head quotactl;
- struct list_head quota_on;
- struct list_head syslog;
- struct list_head settime;
- struct list_head vm_enough_memory;
- struct list_head bprm_set_creds;
- struct list_head bprm_check_security;
- struct list_head bprm_secureexec;
- struct list_head bprm_committing_creds;
- struct list_head bprm_committed_creds;
- struct list_head sb_alloc_security;
- struct list_head sb_free_security;
- struct list_head sb_copy_data;
- struct list_head sb_remount;
- struct list_head sb_kern_mount;
- struct list_head sb_show_options;
- struct list_head sb_statfs;
- struct list_head sb_mount;
- struct list_head sb_umount;
- struct list_head sb_pivotroot;
- struct list_head sb_set_mnt_opts;
- struct list_head sb_clone_mnt_opts;
- struct list_head sb_parse_opts_str;
- struct list_head dentry_init_security;
- struct list_head dentry_create_files_as;
+enum security_hook_index {
+ LSM_binder_set_context_mgr,
+ LSM_binder_transaction,
+ LSM_binder_transfer_binder,
+ LSM_binder_transfer_file,
+ LSM_ptrace_access_check,
+ LSM_ptrace_traceme,
+ LSM_capget,
+ LSM_capset,
+ LSM_capable,
+ LSM_quotactl,
+ LSM_quota_on,
+ LSM_syslog,
+ LSM_settime,
+ LSM_vm_enough_memory,
+ LSM_bprm_set_creds,
+ LSM_bprm_check_security,
+ LSM_bprm_secureexec,
+ LSM_bprm_committing_creds,
+ LSM_bprm_committed_creds,
+ LSM_sb_alloc_security,
+ LSM_sb_free_security,
+ LSM_sb_copy_data,
+ LSM_sb_remount,
+ LSM_sb_kern_mount,
+ LSM_sb_show_options,
+ LSM_sb_statfs,
+ LSM_sb_mount,
+ LSM_sb_umount,
+ LSM_sb_pivotroot,
+ LSM_sb_set_mnt_opts,
+ LSM_sb_clone_mnt_opts,
+ LSM_sb_parse_opts_str,
+ LSM_dentry_init_security,
+ LSM_dentry_create_files_as,
#ifdef CONFIG_SECURITY_PATH
- struct list_head path_unlink;
- struct list_head path_mkdir;
- struct list_head path_rmdir;
- struct list_head path_mknod;
- struct list_head path_truncate;
- struct list_head path_symlink;
- struct list_head path_link;
- struct list_head path_rename;
- struct list_head path_chmod;
- struct list_head path_chown;
- struct list_head path_chroot;
+ LSM_path_unlink,
+ LSM_path_mkdir,
+ LSM_path_rmdir,
+ LSM_path_mknod,
+ LSM_path_truncate,
+ LSM_path_symlink,
+ LSM_path_link,
+ LSM_path_rename,
+ LSM_path_chmod,
+ LSM_path_chown,
+ LSM_path_chroot,
#endif
- struct list_head inode_alloc_security;
- struct list_head inode_free_security;
- struct list_head inode_init_security;
- struct list_head inode_create;
- struct list_head inode_link;
- struct list_head inode_unlink;
- struct list_head inode_symlink;
- struct list_head inode_mkdir;
- struct list_head inode_rmdir;
- struct list_head inode_mknod;
- struct list_head inode_rename;
- struct list_head inode_readlink;
- struct list_head inode_follow_link;
- struct list_head inode_permission;
- struct list_head inode_setattr;
- struct list_head inode_getattr;
- struct list_head inode_setxattr;
- struct list_head inode_post_setxattr;
- struct list_head inode_getxattr;
- struct list_head inode_listxattr;
- struct list_head inode_removexattr;
- struct list_head inode_need_killpriv;
- struct list_head inode_killpriv;
- struct list_head inode_getsecurity;
- struct list_head inode_setsecurity;
- struct list_head inode_listsecurity;
- struct list_head inode_getsecid;
- struct list_head inode_copy_up;
- struct list_head inode_copy_up_xattr;
- struct list_head file_permission;
- struct list_head file_alloc_security;
- struct list_head file_free_security;
- struct list_head file_ioctl;
- struct list_head mmap_addr;
- struct list_head mmap_file;
- struct list_head file_mprotect;
- struct list_head file_lock;
- struct list_head file_fcntl;
- struct list_head file_set_fowner;
- struct list_head file_send_sigiotask;
- struct list_head file_receive;
- struct list_head file_open;
- struct list_head task_create;
- struct list_head task_alloc;
- struct list_head task_free;
- struct list_head cred_alloc_blank;
- struct list_head cred_free;
- struct list_head cred_prepare;
- struct list_head cred_transfer;
- struct list_head kernel_act_as;
- struct list_head kernel_create_files_as;
- struct list_head kernel_read_file;
- struct list_head kernel_post_read_file;
- struct list_head kernel_module_request;
- struct list_head task_fix_setuid;
- struct list_head task_setpgid;
- struct list_head task_getpgid;
- struct list_head task_getsid;
- struct list_head task_getsecid;
- struct list_head task_setnice;
- struct list_head task_setioprio;
- struct list_head task_getioprio;
- struct list_head task_prlimit;
- struct list_head task_setrlimit;
- struct list_head task_setscheduler;
- struct list_head task_getscheduler;
- struct list_head task_movememory;
- struct list_head task_kill;
- struct list_head task_prctl;
- struct list_head task_to_inode;
- struct list_head ipc_permission;
- struct list_head ipc_getsecid;
- struct list_head msg_msg_alloc_security;
- struct list_head msg_msg_free_security;
- struct list_head msg_queue_alloc_security;
- struct list_head msg_queue_free_security;
- struct list_head msg_queue_associate;
- struct list_head msg_queue_msgctl;
- struct list_head msg_queue_msgsnd;
- struct list_head msg_queue_msgrcv;
- struct list_head shm_alloc_security;
- struct list_head shm_free_security;
- struct list_head shm_associate;
- struct list_head shm_shmctl;
- struct list_head shm_shmat;
- struct list_head sem_alloc_security;
- struct list_head sem_free_security;
- struct list_head sem_associate;
- struct list_head sem_semctl;
- struct list_head sem_semop;
- struct list_head netlink_send;
- struct list_head d_instantiate;
- struct list_head getprocattr;
- struct list_head setprocattr;
- struct list_head ismaclabel;
- struct list_head secid_to_secctx;
- struct list_head secctx_to_secid;
- struct list_head release_secctx;
- struct list_head inode_invalidate_secctx;
- struct list_head inode_notifysecctx;
- struct list_head inode_setsecctx;
- struct list_head inode_getsecctx;
+ LSM_inode_alloc_security,
+ LSM_inode_free_security,
+ LSM_inode_init_security,
+ LSM_inode_create,
+ LSM_inode_link,
+ LSM_inode_unlink,
+ LSM_inode_symlink,
+ LSM_inode_mkdir,
+ LSM_inode_rmdir,
+ LSM_inode_mknod,
+ LSM_inode_rename,
+ LSM_inode_readlink,
+ LSM_inode_follow_link,
+ LSM_inode_permission,
+ LSM_inode_setattr,
+ LSM_inode_getattr,
+ LSM_inode_setxattr,
+ LSM_inode_post_setxattr,
+ LSM_inode_getxattr,
+ LSM_inode_listxattr,
+ LSM_inode_removexattr,
+ LSM_inode_need_killpriv,
+ LSM_inode_killpriv,
+ LSM_inode_getsecurity,
+ LSM_inode_setsecurity,
+ LSM_inode_listsecurity,
+ LSM_inode_getsecid,
+ LSM_inode_copy_up,
+ LSM_inode_copy_up_xattr,
+ LSM_file_permission,
+ LSM_file_alloc_security,
+ LSM_file_free_security,
+ LSM_file_ioctl,
+ LSM_mmap_addr,
+ LSM_mmap_file,
+ LSM_file_mprotect,
+ LSM_file_lock,
+ LSM_file_fcntl,
+ LSM_file_set_fowner,
+ LSM_file_send_sigiotask,
+ LSM_file_receive,
+ LSM_file_open,
+ LSM_task_create,
+ LSM_task_alloc,
+ LSM_task_free,
+ LSM_cred_alloc_blank,
+ LSM_cred_free,
+ LSM_cred_prepare,
+ LSM_cred_transfer,
+ LSM_kernel_act_as,
+ LSM_kernel_create_files_as,
+ LSM_kernel_read_file,
+ LSM_kernel_post_read_file,
+ LSM_kernel_module_request,
+ LSM_task_fix_setuid,
+ LSM_task_setpgid,
+ LSM_task_getpgid,
+ LSM_task_getsid,
+ LSM_task_getsecid,
+ LSM_task_setnice,
+ LSM_task_setioprio,
+ LSM_task_getioprio,
+ LSM_task_prlimit,
+ LSM_task_setrlimit,
+ LSM_task_setscheduler,
+ LSM_task_getscheduler,
+ LSM_task_movememory,
+ LSM_task_kill,
+ LSM_task_prctl,
+ LSM_task_to_inode,
+ LSM_ipc_permission,
+ LSM_ipc_getsecid,
+ LSM_msg_msg_alloc_security,
+ LSM_msg_msg_free_security,
+ LSM_msg_queue_alloc_security,
+ LSM_msg_queue_free_security,
+ LSM_msg_queue_associate,
+ LSM_msg_queue_msgctl,
+ LSM_msg_queue_msgsnd,
+ LSM_msg_queue_msgrcv,
+ LSM_shm_alloc_security,
+ LSM_shm_free_security,
+ LSM_shm_associate,
+ LSM_shm_shmctl,
+ LSM_shm_shmat,
+ LSM_sem_alloc_security,
+ LSM_sem_free_security,
+ LSM_sem_associate,
+ LSM_sem_semctl,
+ LSM_sem_semop,
+ LSM_netlink_send,
+ LSM_d_instantiate,
+ LSM_getprocattr,
+ LSM_setprocattr,
+ LSM_ismaclabel,
+ LSM_secid_to_secctx,
+ LSM_secctx_to_secid,
+ LSM_release_secctx,
+ LSM_inode_invalidate_secctx,
+ LSM_inode_notifysecctx,
+ LSM_inode_setsecctx,
+ LSM_inode_getsecctx,
#ifdef CONFIG_SECURITY_NETWORK
- struct list_head unix_stream_connect;
- struct list_head unix_may_send;
- struct list_head socket_create;
- struct list_head socket_post_create;
- struct list_head socket_bind;
- struct list_head socket_connect;
- struct list_head socket_listen;
- struct list_head socket_accept;
- struct list_head socket_sendmsg;
- struct list_head socket_recvmsg;
- struct list_head socket_getsockname;
- struct list_head socket_getpeername;
- struct list_head socket_getsockopt;
- struct list_head socket_setsockopt;
- struct list_head socket_shutdown;
- struct list_head socket_sock_rcv_skb;
- struct list_head socket_getpeersec_stream;
- struct list_head socket_getpeersec_dgram;
- struct list_head sk_alloc_security;
- struct list_head sk_free_security;
- struct list_head sk_clone_security;
- struct list_head sk_getsecid;
- struct list_head sock_graft;
- struct list_head inet_conn_request;
- struct list_head inet_csk_clone;
- struct list_head inet_conn_established;
- struct list_head secmark_relabel_packet;
- struct list_head secmark_refcount_inc;
- struct list_head secmark_refcount_dec;
- struct list_head req_classify_flow;
- struct list_head tun_dev_alloc_security;
- struct list_head tun_dev_free_security;
- struct list_head tun_dev_create;
- struct list_head tun_dev_attach_queue;
- struct list_head tun_dev_attach;
- struct list_head tun_dev_open;
+ LSM_unix_stream_connect,
+ LSM_unix_may_send,
+ LSM_socket_create,
+ LSM_socket_post_create,
+ LSM_socket_bind,
+ LSM_socket_connect,
+ LSM_socket_listen,
+ LSM_socket_accept,
+ LSM_socket_sendmsg,
+ LSM_socket_recvmsg,
+ LSM_socket_getsockname,
+ LSM_socket_getpeername,
+ LSM_socket_getsockopt,
+ LSM_socket_setsockopt,
+ LSM_socket_shutdown,
+ LSM_socket_sock_rcv_skb,
+ LSM_socket_getpeersec_stream,
+ LSM_socket_getpeersec_dgram,
+ LSM_sk_alloc_security,
+ LSM_sk_free_security,
+ LSM_sk_clone_security,
+ LSM_sk_getsecid,
+ LSM_sock_graft,
+ LSM_inet_conn_request,
+ LSM_inet_csk_clone,
+ LSM_inet_conn_established,
+ LSM_secmark_relabel_packet,
+ LSM_secmark_refcount_inc,
+ LSM_secmark_refcount_dec,
+ LSM_req_classify_flow,
+ LSM_tun_dev_alloc_security,
+ LSM_tun_dev_free_security,
+ LSM_tun_dev_create,
+ LSM_tun_dev_attach_queue,
+ LSM_tun_dev_attach,
+ LSM_tun_dev_open,
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_INFINIBAND
- struct list_head ib_pkey_access;
- struct list_head ib_endport_manage_subnet;
- struct list_head ib_alloc_security;
- struct list_head ib_free_security;
+ LSM_ib_pkey_access,
+ LSM_ib_endport_manage_subnet,
+ LSM_ib_alloc_security,
+ LSM_ib_free_security,
#endif /* CONFIG_SECURITY_INFINIBAND */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
- struct list_head xfrm_policy_alloc_security;
- struct list_head xfrm_policy_clone_security;
- struct list_head xfrm_policy_free_security;
- struct list_head xfrm_policy_delete_security;
- struct list_head xfrm_state_alloc;
- struct list_head xfrm_state_alloc_acquire;
- struct list_head xfrm_state_free_security;
- struct list_head xfrm_state_delete_security;
- struct list_head xfrm_policy_lookup;
- struct list_head xfrm_state_pol_flow_match;
- struct list_head xfrm_decode_session;
+ LSM_xfrm_policy_alloc_security,
+ LSM_xfrm_policy_clone_security,
+ LSM_xfrm_policy_free_security,
+ LSM_xfrm_policy_delete_security,
+ LSM_xfrm_state_alloc,
+ LSM_xfrm_state_alloc_acquire,
+ LSM_xfrm_state_free_security,
+ LSM_xfrm_state_delete_security,
+ LSM_xfrm_policy_lookup,
+ LSM_xfrm_state_pol_flow_match,
+ LSM_xfrm_decode_session,
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
#ifdef CONFIG_KEYS
- struct list_head key_alloc;
- struct list_head key_free;
- struct list_head key_permission;
- struct list_head key_getsecurity;
+ LSM_key_alloc,
+ LSM_key_free,
+ LSM_key_permission,
+ LSM_key_getsecurity,
#endif /* CONFIG_KEYS */
#ifdef CONFIG_AUDIT
- struct list_head audit_rule_init;
- struct list_head audit_rule_known;
- struct list_head audit_rule_match;
- struct list_head audit_rule_free;
+ LSM_audit_rule_init,
+ LSM_audit_rule_known,
+ LSM_audit_rule_match,
+ LSM_audit_rule_free,
#endif /* CONFIG_AUDIT */
+ LSM_MAX_HOOK_INDEX,
};
/*
@@ -1921,8 +1922,8 @@ struct security_hook_heads {
*/
struct security_hook_list {
struct list_head list;
- struct list_head *head;
union security_list_options hook;
+ enum security_hook_index idx;
char *lsm;
};
@@ -1933,9 +1934,8 @@ struct security_hook_list {
* text involved.
*/
#define LSM_HOOK_INIT(HEAD, HOOK) \
- { .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } }
+ { .idx = LSM_##HEAD, .hook = { .HEAD = HOOK } }
-extern struct security_hook_heads security_hook_heads;
extern char *lsm_names;
extern void security_add_hooks(struct security_hook_list *hooks, int count,
diff --git a/security/security.c b/security/security.c
index 3013237..44c47b6 100644
--- a/security/security.c
+++ b/security/security.c
@@ -34,7 +34,8 @@
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
-struct security_hook_heads security_hook_heads __lsm_ro_after_init;
+static struct list_head hook_heads[LSM_MAX_HOOK_INDEX]
+ __lsm_ro_after_init;
static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);
char *lsm_names;
@@ -59,12 +60,10 @@ static void __init do_security_initcalls(void)
*/
int __init security_init(void)
{
- int i;
- struct list_head *list = (struct list_head *) &security_hook_heads;
+ enum security_hook_index i;
- for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct list_head);
- i++)
- INIT_LIST_HEAD(&list[i]);
+ for (i = 0; i < LSM_MAX_HOOK_INDEX; i++)
+ INIT_LIST_HEAD(&hook_heads[i]);
pr_info("Security Framework initialized\n");
/*
@@ -161,8 +160,12 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
int i;
for (i = 0; i < count; i++) {
+ enum security_hook_index idx = hooks[i].idx;
+
hooks[i].lsm = lsm;
- list_add_tail_rcu(&hooks[i].list, hooks[i].head);
+ /* Can't hit this BUG_ON() unless LSM_HOOK_INIT() is broken. */
+ BUG_ON(idx < 0 || idx >= LSM_MAX_HOOK_INDEX);
+ list_add_tail_rcu(&hooks[i].list, &hook_heads[idx]);
}
if (lsm_append(lsm, &lsm_names) < 0)
panic("%s - Cannot get early memory.\n", __func__);
@@ -200,7 +203,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
do { \
struct security_hook_list *P; \
\
- list_for_each_entry(P, &security_hook_heads.FUNC, list) \
+ list_for_each_entry(P, &hook_heads[LSM_##FUNC], list) \
P->hook.FUNC(__VA_ARGS__); \
} while (0)
@@ -209,7 +212,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
do { \
struct security_hook_list *P; \
\
- list_for_each_entry(P, &security_hook_heads.FUNC, list) { \
+ list_for_each_entry(P, &hook_heads[LSM_##FUNC], list) { \
RC = P->hook.FUNC(__VA_ARGS__); \
if (RC != 0) \
break; \
@@ -316,7 +319,7 @@ int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
* agree that it should be set it will. If any module
* thinks it should not be set it won't.
*/
- list_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_vm_enough_memory], list) {
rc = hp->hook.vm_enough_memory(mm, pages);
if (rc <= 0) {
cap_sys_admin = 0;
@@ -809,7 +812,7 @@ int security_inode_getsecurity(struct inode *inode, const char *name, void **buf
/*
* Only one module will provide an attribute with a given name.
*/
- list_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_inode_getsecurity], list) {
rc = hp->hook.inode_getsecurity(inode, name, buffer, alloc);
if (rc != -EOPNOTSUPP)
return rc;
@@ -827,7 +830,7 @@ int security_inode_setsecurity(struct inode *inode, const char *name, const void
/*
* Only one module will provide an attribute with a given name.
*/
- list_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_inode_setsecurity], list) {
rc = hp->hook.inode_setsecurity(inode, name, value, size,
flags);
if (rc != -EOPNOTSUPP)
@@ -1135,7 +1138,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
int rc = -ENOSYS;
struct security_hook_list *hp;
- list_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_task_prctl], list) {
thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
if (thisrc != -ENOSYS) {
rc = thisrc;
@@ -1638,7 +1641,7 @@ int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
* For speed optimization, we explicitly break the loop rather than
* using the macro
*/
- list_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
+ list_for_each_entry(hp, &hook_heads[LSM_xfrm_state_pol_flow_match],
list) {
rc = hp->hook.xfrm_state_pol_flow_match(x, xp, fl);
break;
--
2.9.3
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^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 3/3] Make LSM Writable Hooks a command line option
2017-06-27 17:33 [PATCH v8 0/3] mm: LSM: ro protection for dynamic data Igor Stoppa
2017-06-27 17:33 ` [PATCH 1/3] Protectable memory support Igor Stoppa
2017-06-27 17:33 ` [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head Igor Stoppa
@ 2017-06-27 17:33 ` Igor Stoppa
2017-06-27 17:51 ` Christoph Hellwig
2 siblings, 1 reply; 10+ messages in thread
From: Igor Stoppa @ 2017-06-27 17:33 UTC (permalink / raw)
To: keescook, mhocko, jmorris
Cc: penguin-kernel, paul, sds, casey, hch, labbott,
linux-security-module, linux-mm, linux-kernel, kernel-hardening,
Igor Stoppa, Igor Stoppa
From: Igor Stoppa <igor.stoppa@gmail.com>
This patch shows how it is possible to take advantage of pmalloc:
instead of using the build-time option __lsm_ro_after_init, to decide if
it is possible to keep the hooks modifiable, now this becomes a
boot-time decision, based on the kernel command line.
This patch relies on:
"Convert security_hook_heads into explicit array of struct list_head"
Author: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
to break free from the static constraint imposed by the previous
hardening model, based on __ro_after_init.
The default value is disabled, unless SE Linux debugging is turned on.
Signed-off-by: Igor Stoppa <igor.stoppa@huawei.com>
CC: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
---
security/security.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/security/security.c b/security/security.c
index 44c47b6..c7b4670 100644
--- a/security/security.c
+++ b/security/security.c
@@ -27,6 +27,7 @@
#include <linux/personality.h>
#include <linux/backing-dev.h>
#include <linux/string.h>
+#include <linux/pmalloc.h>
#include <net/flow.h>
#define MAX_LSM_EVM_XATTR 2
@@ -34,10 +35,19 @@
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
-static struct list_head hook_heads[LSM_MAX_HOOK_INDEX]
- __lsm_ro_after_init;
static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);
+static int dynamic_lsm = IS_ENABLED(CONFIG_SECURITY_SELINUX_DISABLE);
+
+static __init int set_dynamic_lsm(char *str)
+{
+ get_option(&str, &dynamic_lsm);
+ return 0;
+}
+early_param("dynamic_lsm", set_dynamic_lsm);
+
+static struct list_head *hook_heads;
+static struct gen_pool *sec_pool;
char *lsm_names;
/* Boot-time LSM user choice */
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
@@ -62,6 +72,11 @@ int __init security_init(void)
{
enum security_hook_index i;
+ sec_pool = pmalloc_create_pool("security", PMALLOC_DEFAULT_ALLOC_ORDER);
+ BUG_ON(!sec_pool);
+ hook_heads = pmalloc(sec_pool,
+ sizeof(struct list_head) * LSM_MAX_HOOK_INDEX);
+ BUG_ON(!hook_heads);
for (i = 0; i < LSM_MAX_HOOK_INDEX; i++)
INIT_LIST_HEAD(&hook_heads[i]);
pr_info("Security Framework initialized\n");
@@ -77,7 +92,8 @@ int __init security_init(void)
* Load all the remaining security modules.
*/
do_security_initcalls();
-
+ if (!dynamic_lsm)
+ pmalloc_protect_pool(sec_pool);
return 0;
}
--
2.9.3
--
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^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [PATCH 3/3] Make LSM Writable Hooks a command line option
2017-06-27 17:33 ` [PATCH 3/3] Make LSM Writable Hooks a command line option Igor Stoppa
@ 2017-06-27 17:51 ` Christoph Hellwig
2017-06-27 20:07 ` igor.stoppa
2017-06-28 8:25 ` Igor Stoppa
0 siblings, 2 replies; 10+ messages in thread
From: Christoph Hellwig @ 2017-06-27 17:51 UTC (permalink / raw)
To: Igor Stoppa
Cc: keescook, mhocko, jmorris, penguin-kernel, paul, sds, casey, hch,
labbott, linux-security-module, linux-mm, linux-kernel,
kernel-hardening, Igor Stoppa
On Tue, Jun 27, 2017 at 08:33:23PM +0300, Igor Stoppa wrote:
> From: Igor Stoppa <igor.stoppa@gmail.com>
>
> This patch shows how it is possible to take advantage of pmalloc:
> instead of using the build-time option __lsm_ro_after_init, to decide if
> it is possible to keep the hooks modifiable, now this becomes a
> boot-time decision, based on the kernel command line.
>
> This patch relies on:
>
> "Convert security_hook_heads into explicit array of struct list_head"
> Author: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
>
> to break free from the static constraint imposed by the previous
> hardening model, based on __ro_after_init.
>
> The default value is disabled, unless SE Linux debugging is turned on.
Can we please just force it to be read-only?
--
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^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 3/3] Make LSM Writable Hooks a command line option
2017-06-27 17:51 ` Christoph Hellwig
@ 2017-06-27 20:07 ` igor.stoppa
2017-06-28 8:25 ` Igor Stoppa
1 sibling, 0 replies; 10+ messages in thread
From: igor.stoppa @ 2017-06-27 20:07 UTC (permalink / raw)
To: Christoph Hellwig
Cc: Igor Stoppa, keescook, mhocko, jmorris, penguin-kernel, paul,
sds, casey, labbott, linux-security-module, linux-mm,
linux-kernel, kernel-hardening
[-- Attachment #1: Type: text/plain, Size: 604 bytes --]
On 27 June 2017 at 20:51, Christoph Hellwig <hch@infradead.org> wrote:
> On Tue, Jun 27, 2017 at 08:33:23PM +0300, Igor Stoppa wrote:
>
> [...]
> > The default value is disabled, unless SE Linux debugging is turned on.
>
> Can we please just force it to be read-only?
>
I'm sorry, I'm not quite sure I understand your comment.
I'm trying to replicate the behavior of __lsm_ro_after_init:
line 1967 @ [1] - Did I get it wrong?
thanks, igor
[1]
https://kernel.googlesource.com/pub/scm/linux/kernel/git/jmorris/linux-security/+/5965453d5e3fb425e6f9d6b4fec403bda3f33107/include/linux/lsm_hooks.h
[-- Attachment #2: Type: text/html, Size: 1642 bytes --]
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 3/3] Make LSM Writable Hooks a command line option
2017-06-27 17:51 ` Christoph Hellwig
2017-06-27 20:07 ` igor.stoppa
@ 2017-06-28 8:25 ` Igor Stoppa
1 sibling, 0 replies; 10+ messages in thread
From: Igor Stoppa @ 2017-06-28 8:25 UTC (permalink / raw)
To: Christoph Hellwig
Cc: keescook, mhocko, jmorris, penguin-kernel, paul, sds, casey,
labbott, linux-security-module, linux-mm, linux-kernel,
kernel-hardening, Igor Stoppa
Resending my reply, I mistakenly used the wrong mail account yesterday
and my reply didn't et to the ml.
On 27/06/17 20:51, Christoph Hellwig wrote:
> On Tue, Jun 27, 2017 at 08:33:23PM +0300, Igor Stoppa wrote:
[...]
>> The default value is disabled, unless SE Linux debugging is turned on.
>
> Can we please just force it to be read-only?
I'm sorry, I'm not quite sure I understand your comment.
I'm trying to replicate the behavior of __lsm_ro_after_init:
line 1967 @ [1] - Did I get it wrong?
thanks, igor
[1]
https://kernel.googlesource.com/pub/scm/linux/kernel/git/jmorris/linux-security/+/5965453d5e3fb425e6f9d6b4fec403bda3f33107/include/linux/lsm_hooks.h
--
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^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head
2017-07-10 15:06 [PATCH v10 0/3] mm: security: ro protection for dynamic data Igor Stoppa
@ 2017-07-10 15:06 ` Igor Stoppa
0 siblings, 0 replies; 10+ messages in thread
From: Igor Stoppa @ 2017-07-10 15:06 UTC (permalink / raw)
To: jglisse, keescook, mhocko, jmorris, penguin-kernel, labbott, hch
Cc: paul, sds, casey, linux-security-module, linux-mm, linux-kernel,
kernel-hardening, James Morris, Igor Stoppa
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Commit 3dfc9b02864b19f4 ("LSM: Initialize security_hook_heads upon
registration.") treats "struct security_hook_heads" as an implicit array
of "struct list_head" so that we can eliminate code for static
initialization. Although we haven't encountered compilers which do not
treat sizeof(security_hook_heads) != sizeof(struct list_head) *
(sizeof(security_hook_heads) / sizeof(struct list_head)), Casey does not
like the assumption that a structure of N elements can be assumed to be
the same as an array of N elements.
Now that Kees found that randstruct complains about such casting
security/security.c: In function 'security_init':
security/security.c:59:20: note: found mismatched op0 struct pointer
types: 'struct list_head' and 'struct security_hook_heads'
struct list_head *list = (struct list_head *) &security_hook_heads;
and Christoph thinks that we should fix it rather than make randstruct
whitelist it, this patch fixes it.
It would be possible to revert commit 3dfc9b02864b19f4, but this patch
converts security_hook_heads into an explicit array of struct list_head
by introducing an enum, due to reasons explained below.
Igor proposed a sealable memory allocator, and the LSM hooks
("struct security_hook_heads security_hook_heads" and
"struct security_hook_list ...[]") will benefit from that allocator via
protection using set_memory_ro()/set_memory_rw(), and that allocator
will remove CONFIG_SECURITY_WRITABLE_HOOKS config option. Thus, we will
likely be moving to that direction.
This means that these structures will be allocated at run time using
that allocator, and therefore the address of these structures will be
determined at run time rather than compile time.
But currently, LSM_HOOK_INIT() macro depends on the address of
security_hook_heads being known at compile time. If we use an enum
so that LSM_HOOK_INIT() macro does not need to know absolute address of
security_hook_heads, it will help us to use that allocator for LSM hooks.
As a result of introducing an enum, security_hook_heads becomes a local
variable. In order to pass 80 columns check by scripts/checkpatch.pl ,
rename security_hook_heads to hook_heads.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Rebased-by: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Christoph Hellwig <hch@infradead.org>
---
include/linux/lsm_hooks.h | 420 +++++++++++++++++++++++-----------------------
security/security.c | 31 ++--
2 files changed, 227 insertions(+), 224 deletions(-)
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 3cc9d77..32f30fa 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1694,225 +1694,226 @@ union security_list_options {
#endif /* CONFIG_AUDIT */
};
-struct security_hook_heads {
- struct list_head binder_set_context_mgr;
- struct list_head binder_transaction;
- struct list_head binder_transfer_binder;
- struct list_head binder_transfer_file;
- struct list_head ptrace_access_check;
- struct list_head ptrace_traceme;
- struct list_head capget;
- struct list_head capset;
- struct list_head capable;
- struct list_head quotactl;
- struct list_head quota_on;
- struct list_head syslog;
- struct list_head settime;
- struct list_head vm_enough_memory;
- struct list_head bprm_set_creds;
- struct list_head bprm_check_security;
- struct list_head bprm_secureexec;
- struct list_head bprm_committing_creds;
- struct list_head bprm_committed_creds;
- struct list_head sb_alloc_security;
- struct list_head sb_free_security;
- struct list_head sb_copy_data;
- struct list_head sb_remount;
- struct list_head sb_kern_mount;
- struct list_head sb_show_options;
- struct list_head sb_statfs;
- struct list_head sb_mount;
- struct list_head sb_umount;
- struct list_head sb_pivotroot;
- struct list_head sb_set_mnt_opts;
- struct list_head sb_clone_mnt_opts;
- struct list_head sb_parse_opts_str;
- struct list_head dentry_init_security;
- struct list_head dentry_create_files_as;
+enum security_hook_index {
+ LSM_binder_set_context_mgr,
+ LSM_binder_transaction,
+ LSM_binder_transfer_binder,
+ LSM_binder_transfer_file,
+ LSM_ptrace_access_check,
+ LSM_ptrace_traceme,
+ LSM_capget,
+ LSM_capset,
+ LSM_capable,
+ LSM_quotactl,
+ LSM_quota_on,
+ LSM_syslog,
+ LSM_settime,
+ LSM_vm_enough_memory,
+ LSM_bprm_set_creds,
+ LSM_bprm_check_security,
+ LSM_bprm_secureexec,
+ LSM_bprm_committing_creds,
+ LSM_bprm_committed_creds,
+ LSM_sb_alloc_security,
+ LSM_sb_free_security,
+ LSM_sb_copy_data,
+ LSM_sb_remount,
+ LSM_sb_kern_mount,
+ LSM_sb_show_options,
+ LSM_sb_statfs,
+ LSM_sb_mount,
+ LSM_sb_umount,
+ LSM_sb_pivotroot,
+ LSM_sb_set_mnt_opts,
+ LSM_sb_clone_mnt_opts,
+ LSM_sb_parse_opts_str,
+ LSM_dentry_init_security,
+ LSM_dentry_create_files_as,
#ifdef CONFIG_SECURITY_PATH
- struct list_head path_unlink;
- struct list_head path_mkdir;
- struct list_head path_rmdir;
- struct list_head path_mknod;
- struct list_head path_truncate;
- struct list_head path_symlink;
- struct list_head path_link;
- struct list_head path_rename;
- struct list_head path_chmod;
- struct list_head path_chown;
- struct list_head path_chroot;
+ LSM_path_unlink,
+ LSM_path_mkdir,
+ LSM_path_rmdir,
+ LSM_path_mknod,
+ LSM_path_truncate,
+ LSM_path_symlink,
+ LSM_path_link,
+ LSM_path_rename,
+ LSM_path_chmod,
+ LSM_path_chown,
+ LSM_path_chroot,
#endif
- struct list_head inode_alloc_security;
- struct list_head inode_free_security;
- struct list_head inode_init_security;
- struct list_head inode_create;
- struct list_head inode_link;
- struct list_head inode_unlink;
- struct list_head inode_symlink;
- struct list_head inode_mkdir;
- struct list_head inode_rmdir;
- struct list_head inode_mknod;
- struct list_head inode_rename;
- struct list_head inode_readlink;
- struct list_head inode_follow_link;
- struct list_head inode_permission;
- struct list_head inode_setattr;
- struct list_head inode_getattr;
- struct list_head inode_setxattr;
- struct list_head inode_post_setxattr;
- struct list_head inode_getxattr;
- struct list_head inode_listxattr;
- struct list_head inode_removexattr;
- struct list_head inode_need_killpriv;
- struct list_head inode_killpriv;
- struct list_head inode_getsecurity;
- struct list_head inode_setsecurity;
- struct list_head inode_listsecurity;
- struct list_head inode_getsecid;
- struct list_head inode_copy_up;
- struct list_head inode_copy_up_xattr;
- struct list_head file_permission;
- struct list_head file_alloc_security;
- struct list_head file_free_security;
- struct list_head file_ioctl;
- struct list_head mmap_addr;
- struct list_head mmap_file;
- struct list_head file_mprotect;
- struct list_head file_lock;
- struct list_head file_fcntl;
- struct list_head file_set_fowner;
- struct list_head file_send_sigiotask;
- struct list_head file_receive;
- struct list_head file_open;
- struct list_head task_create;
- struct list_head task_alloc;
- struct list_head task_free;
- struct list_head cred_alloc_blank;
- struct list_head cred_free;
- struct list_head cred_prepare;
- struct list_head cred_transfer;
- struct list_head kernel_act_as;
- struct list_head kernel_create_files_as;
- struct list_head kernel_read_file;
- struct list_head kernel_post_read_file;
- struct list_head kernel_module_request;
- struct list_head task_fix_setuid;
- struct list_head task_setpgid;
- struct list_head task_getpgid;
- struct list_head task_getsid;
- struct list_head task_getsecid;
- struct list_head task_setnice;
- struct list_head task_setioprio;
- struct list_head task_getioprio;
- struct list_head task_prlimit;
- struct list_head task_setrlimit;
- struct list_head task_setscheduler;
- struct list_head task_getscheduler;
- struct list_head task_movememory;
- struct list_head task_kill;
- struct list_head task_prctl;
- struct list_head task_to_inode;
- struct list_head ipc_permission;
- struct list_head ipc_getsecid;
- struct list_head msg_msg_alloc_security;
- struct list_head msg_msg_free_security;
- struct list_head msg_queue_alloc_security;
- struct list_head msg_queue_free_security;
- struct list_head msg_queue_associate;
- struct list_head msg_queue_msgctl;
- struct list_head msg_queue_msgsnd;
- struct list_head msg_queue_msgrcv;
- struct list_head shm_alloc_security;
- struct list_head shm_free_security;
- struct list_head shm_associate;
- struct list_head shm_shmctl;
- struct list_head shm_shmat;
- struct list_head sem_alloc_security;
- struct list_head sem_free_security;
- struct list_head sem_associate;
- struct list_head sem_semctl;
- struct list_head sem_semop;
- struct list_head netlink_send;
- struct list_head d_instantiate;
- struct list_head getprocattr;
- struct list_head setprocattr;
- struct list_head ismaclabel;
- struct list_head secid_to_secctx;
- struct list_head secctx_to_secid;
- struct list_head release_secctx;
- struct list_head inode_invalidate_secctx;
- struct list_head inode_notifysecctx;
- struct list_head inode_setsecctx;
- struct list_head inode_getsecctx;
+ LSM_inode_alloc_security,
+ LSM_inode_free_security,
+ LSM_inode_init_security,
+ LSM_inode_create,
+ LSM_inode_link,
+ LSM_inode_unlink,
+ LSM_inode_symlink,
+ LSM_inode_mkdir,
+ LSM_inode_rmdir,
+ LSM_inode_mknod,
+ LSM_inode_rename,
+ LSM_inode_readlink,
+ LSM_inode_follow_link,
+ LSM_inode_permission,
+ LSM_inode_setattr,
+ LSM_inode_getattr,
+ LSM_inode_setxattr,
+ LSM_inode_post_setxattr,
+ LSM_inode_getxattr,
+ LSM_inode_listxattr,
+ LSM_inode_removexattr,
+ LSM_inode_need_killpriv,
+ LSM_inode_killpriv,
+ LSM_inode_getsecurity,
+ LSM_inode_setsecurity,
+ LSM_inode_listsecurity,
+ LSM_inode_getsecid,
+ LSM_inode_copy_up,
+ LSM_inode_copy_up_xattr,
+ LSM_file_permission,
+ LSM_file_alloc_security,
+ LSM_file_free_security,
+ LSM_file_ioctl,
+ LSM_mmap_addr,
+ LSM_mmap_file,
+ LSM_file_mprotect,
+ LSM_file_lock,
+ LSM_file_fcntl,
+ LSM_file_set_fowner,
+ LSM_file_send_sigiotask,
+ LSM_file_receive,
+ LSM_file_open,
+ LSM_task_create,
+ LSM_task_alloc,
+ LSM_task_free,
+ LSM_cred_alloc_blank,
+ LSM_cred_free,
+ LSM_cred_prepare,
+ LSM_cred_transfer,
+ LSM_kernel_act_as,
+ LSM_kernel_create_files_as,
+ LSM_kernel_read_file,
+ LSM_kernel_post_read_file,
+ LSM_kernel_module_request,
+ LSM_task_fix_setuid,
+ LSM_task_setpgid,
+ LSM_task_getpgid,
+ LSM_task_getsid,
+ LSM_task_getsecid,
+ LSM_task_setnice,
+ LSM_task_setioprio,
+ LSM_task_getioprio,
+ LSM_task_prlimit,
+ LSM_task_setrlimit,
+ LSM_task_setscheduler,
+ LSM_task_getscheduler,
+ LSM_task_movememory,
+ LSM_task_kill,
+ LSM_task_prctl,
+ LSM_task_to_inode,
+ LSM_ipc_permission,
+ LSM_ipc_getsecid,
+ LSM_msg_msg_alloc_security,
+ LSM_msg_msg_free_security,
+ LSM_msg_queue_alloc_security,
+ LSM_msg_queue_free_security,
+ LSM_msg_queue_associate,
+ LSM_msg_queue_msgctl,
+ LSM_msg_queue_msgsnd,
+ LSM_msg_queue_msgrcv,
+ LSM_shm_alloc_security,
+ LSM_shm_free_security,
+ LSM_shm_associate,
+ LSM_shm_shmctl,
+ LSM_shm_shmat,
+ LSM_sem_alloc_security,
+ LSM_sem_free_security,
+ LSM_sem_associate,
+ LSM_sem_semctl,
+ LSM_sem_semop,
+ LSM_netlink_send,
+ LSM_d_instantiate,
+ LSM_getprocattr,
+ LSM_setprocattr,
+ LSM_ismaclabel,
+ LSM_secid_to_secctx,
+ LSM_secctx_to_secid,
+ LSM_release_secctx,
+ LSM_inode_invalidate_secctx,
+ LSM_inode_notifysecctx,
+ LSM_inode_setsecctx,
+ LSM_inode_getsecctx,
#ifdef CONFIG_SECURITY_NETWORK
- struct list_head unix_stream_connect;
- struct list_head unix_may_send;
- struct list_head socket_create;
- struct list_head socket_post_create;
- struct list_head socket_bind;
- struct list_head socket_connect;
- struct list_head socket_listen;
- struct list_head socket_accept;
- struct list_head socket_sendmsg;
- struct list_head socket_recvmsg;
- struct list_head socket_getsockname;
- struct list_head socket_getpeername;
- struct list_head socket_getsockopt;
- struct list_head socket_setsockopt;
- struct list_head socket_shutdown;
- struct list_head socket_sock_rcv_skb;
- struct list_head socket_getpeersec_stream;
- struct list_head socket_getpeersec_dgram;
- struct list_head sk_alloc_security;
- struct list_head sk_free_security;
- struct list_head sk_clone_security;
- struct list_head sk_getsecid;
- struct list_head sock_graft;
- struct list_head inet_conn_request;
- struct list_head inet_csk_clone;
- struct list_head inet_conn_established;
- struct list_head secmark_relabel_packet;
- struct list_head secmark_refcount_inc;
- struct list_head secmark_refcount_dec;
- struct list_head req_classify_flow;
- struct list_head tun_dev_alloc_security;
- struct list_head tun_dev_free_security;
- struct list_head tun_dev_create;
- struct list_head tun_dev_attach_queue;
- struct list_head tun_dev_attach;
- struct list_head tun_dev_open;
+ LSM_unix_stream_connect,
+ LSM_unix_may_send,
+ LSM_socket_create,
+ LSM_socket_post_create,
+ LSM_socket_bind,
+ LSM_socket_connect,
+ LSM_socket_listen,
+ LSM_socket_accept,
+ LSM_socket_sendmsg,
+ LSM_socket_recvmsg,
+ LSM_socket_getsockname,
+ LSM_socket_getpeername,
+ LSM_socket_getsockopt,
+ LSM_socket_setsockopt,
+ LSM_socket_shutdown,
+ LSM_socket_sock_rcv_skb,
+ LSM_socket_getpeersec_stream,
+ LSM_socket_getpeersec_dgram,
+ LSM_sk_alloc_security,
+ LSM_sk_free_security,
+ LSM_sk_clone_security,
+ LSM_sk_getsecid,
+ LSM_sock_graft,
+ LSM_inet_conn_request,
+ LSM_inet_csk_clone,
+ LSM_inet_conn_established,
+ LSM_secmark_relabel_packet,
+ LSM_secmark_refcount_inc,
+ LSM_secmark_refcount_dec,
+ LSM_req_classify_flow,
+ LSM_tun_dev_alloc_security,
+ LSM_tun_dev_free_security,
+ LSM_tun_dev_create,
+ LSM_tun_dev_attach_queue,
+ LSM_tun_dev_attach,
+ LSM_tun_dev_open,
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_INFINIBAND
- struct list_head ib_pkey_access;
- struct list_head ib_endport_manage_subnet;
- struct list_head ib_alloc_security;
- struct list_head ib_free_security;
+ LSM_ib_pkey_access,
+ LSM_ib_endport_manage_subnet,
+ LSM_ib_alloc_security,
+ LSM_ib_free_security,
#endif /* CONFIG_SECURITY_INFINIBAND */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
- struct list_head xfrm_policy_alloc_security;
- struct list_head xfrm_policy_clone_security;
- struct list_head xfrm_policy_free_security;
- struct list_head xfrm_policy_delete_security;
- struct list_head xfrm_state_alloc;
- struct list_head xfrm_state_alloc_acquire;
- struct list_head xfrm_state_free_security;
- struct list_head xfrm_state_delete_security;
- struct list_head xfrm_policy_lookup;
- struct list_head xfrm_state_pol_flow_match;
- struct list_head xfrm_decode_session;
+ LSM_xfrm_policy_alloc_security,
+ LSM_xfrm_policy_clone_security,
+ LSM_xfrm_policy_free_security,
+ LSM_xfrm_policy_delete_security,
+ LSM_xfrm_state_alloc,
+ LSM_xfrm_state_alloc_acquire,
+ LSM_xfrm_state_free_security,
+ LSM_xfrm_state_delete_security,
+ LSM_xfrm_policy_lookup,
+ LSM_xfrm_state_pol_flow_match,
+ LSM_xfrm_decode_session,
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
#ifdef CONFIG_KEYS
- struct list_head key_alloc;
- struct list_head key_free;
- struct list_head key_permission;
- struct list_head key_getsecurity;
+ LSM_key_alloc,
+ LSM_key_free,
+ LSM_key_permission,
+ LSM_key_getsecurity,
#endif /* CONFIG_KEYS */
#ifdef CONFIG_AUDIT
- struct list_head audit_rule_init;
- struct list_head audit_rule_known;
- struct list_head audit_rule_match;
- struct list_head audit_rule_free;
+ LSM_audit_rule_init,
+ LSM_audit_rule_known,
+ LSM_audit_rule_match,
+ LSM_audit_rule_free,
#endif /* CONFIG_AUDIT */
+ LSM_MAX_HOOK_INDEX,
};
/*
@@ -1921,8 +1922,8 @@ struct security_hook_heads {
*/
struct security_hook_list {
struct list_head list;
- struct list_head *head;
union security_list_options hook;
+ enum security_hook_index idx;
char *lsm;
};
@@ -1933,9 +1934,8 @@ struct security_hook_list {
* text involved.
*/
#define LSM_HOOK_INIT(HEAD, HOOK) \
- { .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } }
+ { .idx = LSM_##HEAD, .hook = { .HEAD = HOOK } }
-extern struct security_hook_heads security_hook_heads;
extern char *lsm_names;
extern void security_add_hooks(struct security_hook_list *hooks, int count,
diff --git a/security/security.c b/security/security.c
index 3013237..44c47b6 100644
--- a/security/security.c
+++ b/security/security.c
@@ -34,7 +34,8 @@
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
-struct security_hook_heads security_hook_heads __lsm_ro_after_init;
+static struct list_head hook_heads[LSM_MAX_HOOK_INDEX]
+ __lsm_ro_after_init;
static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);
char *lsm_names;
@@ -59,12 +60,10 @@ static void __init do_security_initcalls(void)
*/
int __init security_init(void)
{
- int i;
- struct list_head *list = (struct list_head *) &security_hook_heads;
+ enum security_hook_index i;
- for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct list_head);
- i++)
- INIT_LIST_HEAD(&list[i]);
+ for (i = 0; i < LSM_MAX_HOOK_INDEX; i++)
+ INIT_LIST_HEAD(&hook_heads[i]);
pr_info("Security Framework initialized\n");
/*
@@ -161,8 +160,12 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
int i;
for (i = 0; i < count; i++) {
+ enum security_hook_index idx = hooks[i].idx;
+
hooks[i].lsm = lsm;
- list_add_tail_rcu(&hooks[i].list, hooks[i].head);
+ /* Can't hit this BUG_ON() unless LSM_HOOK_INIT() is broken. */
+ BUG_ON(idx < 0 || idx >= LSM_MAX_HOOK_INDEX);
+ list_add_tail_rcu(&hooks[i].list, &hook_heads[idx]);
}
if (lsm_append(lsm, &lsm_names) < 0)
panic("%s - Cannot get early memory.\n", __func__);
@@ -200,7 +203,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
do { \
struct security_hook_list *P; \
\
- list_for_each_entry(P, &security_hook_heads.FUNC, list) \
+ list_for_each_entry(P, &hook_heads[LSM_##FUNC], list) \
P->hook.FUNC(__VA_ARGS__); \
} while (0)
@@ -209,7 +212,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
do { \
struct security_hook_list *P; \
\
- list_for_each_entry(P, &security_hook_heads.FUNC, list) { \
+ list_for_each_entry(P, &hook_heads[LSM_##FUNC], list) { \
RC = P->hook.FUNC(__VA_ARGS__); \
if (RC != 0) \
break; \
@@ -316,7 +319,7 @@ int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
* agree that it should be set it will. If any module
* thinks it should not be set it won't.
*/
- list_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_vm_enough_memory], list) {
rc = hp->hook.vm_enough_memory(mm, pages);
if (rc <= 0) {
cap_sys_admin = 0;
@@ -809,7 +812,7 @@ int security_inode_getsecurity(struct inode *inode, const char *name, void **buf
/*
* Only one module will provide an attribute with a given name.
*/
- list_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_inode_getsecurity], list) {
rc = hp->hook.inode_getsecurity(inode, name, buffer, alloc);
if (rc != -EOPNOTSUPP)
return rc;
@@ -827,7 +830,7 @@ int security_inode_setsecurity(struct inode *inode, const char *name, const void
/*
* Only one module will provide an attribute with a given name.
*/
- list_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_inode_setsecurity], list) {
rc = hp->hook.inode_setsecurity(inode, name, value, size,
flags);
if (rc != -EOPNOTSUPP)
@@ -1135,7 +1138,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
int rc = -ENOSYS;
struct security_hook_list *hp;
- list_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_task_prctl], list) {
thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
if (thisrc != -ENOSYS) {
rc = thisrc;
@@ -1638,7 +1641,7 @@ int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
* For speed optimization, we explicitly break the loop rather than
* using the macro
*/
- list_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
+ list_for_each_entry(hp, &hook_heads[LSM_xfrm_state_pol_flow_match],
list) {
rc = hp->hook.xfrm_state_pol_flow_match(x, xp, fl);
break;
--
2.9.3
--
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^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head
2017-07-05 13:46 [PATCH v9 0/3] mm: security: ro protection for dynamic data Igor Stoppa
@ 2017-07-05 13:46 ` Igor Stoppa
0 siblings, 0 replies; 10+ messages in thread
From: Igor Stoppa @ 2017-07-05 13:46 UTC (permalink / raw)
To: keescook, mhocko, jmorris, labbott, hch
Cc: penguin-kernel, paul, sds, casey, linux-security-module,
linux-mm, linux-kernel, kernel-hardening, James Morris,
Igor Stoppa
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Commit 3dfc9b02864b19f4 ("LSM: Initialize security_hook_heads upon
registration.") treats "struct security_hook_heads" as an implicit array
of "struct list_head" so that we can eliminate code for static
initialization. Although we haven't encountered compilers which do not
treat sizeof(security_hook_heads) != sizeof(struct list_head) *
(sizeof(security_hook_heads) / sizeof(struct list_head)), Casey does not
like the assumption that a structure of N elements can be assumed to be
the same as an array of N elements.
Now that Kees found that randstruct complains about such casting
security/security.c: In function 'security_init':
security/security.c:59:20: note: found mismatched op0 struct pointer
types: 'struct list_head' and 'struct security_hook_heads'
struct list_head *list = (struct list_head *) &security_hook_heads;
and Christoph thinks that we should fix it rather than make randstruct
whitelist it, this patch fixes it.
It would be possible to revert commit 3dfc9b02864b19f4, but this patch
converts security_hook_heads into an explicit array of struct list_head
by introducing an enum, due to reasons explained below.
Igor proposed a sealable memory allocator, and the LSM hooks
("struct security_hook_heads security_hook_heads" and
"struct security_hook_list ...[]") will benefit from that allocator via
protection using set_memory_ro()/set_memory_rw(), and that allocator
will remove CONFIG_SECURITY_WRITABLE_HOOKS config option. Thus, we will
likely be moving to that direction.
This means that these structures will be allocated at run time using
that allocator, and therefore the address of these structures will be
determined at run time rather than compile time.
But currently, LSM_HOOK_INIT() macro depends on the address of
security_hook_heads being known at compile time. If we use an enum
so that LSM_HOOK_INIT() macro does not need to know absolute address of
security_hook_heads, it will help us to use that allocator for LSM hooks.
As a result of introducing an enum, security_hook_heads becomes a local
variable. In order to pass 80 columns check by scripts/checkpatch.pl ,
rename security_hook_heads to hook_heads.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Rebased-by: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Christoph Hellwig <hch@infradead.org>
---
include/linux/lsm_hooks.h | 420 +++++++++++++++++++++++-----------------------
security/security.c | 31 ++--
2 files changed, 227 insertions(+), 224 deletions(-)
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 3cc9d77..32f30fa 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1694,225 +1694,226 @@ union security_list_options {
#endif /* CONFIG_AUDIT */
};
-struct security_hook_heads {
- struct list_head binder_set_context_mgr;
- struct list_head binder_transaction;
- struct list_head binder_transfer_binder;
- struct list_head binder_transfer_file;
- struct list_head ptrace_access_check;
- struct list_head ptrace_traceme;
- struct list_head capget;
- struct list_head capset;
- struct list_head capable;
- struct list_head quotactl;
- struct list_head quota_on;
- struct list_head syslog;
- struct list_head settime;
- struct list_head vm_enough_memory;
- struct list_head bprm_set_creds;
- struct list_head bprm_check_security;
- struct list_head bprm_secureexec;
- struct list_head bprm_committing_creds;
- struct list_head bprm_committed_creds;
- struct list_head sb_alloc_security;
- struct list_head sb_free_security;
- struct list_head sb_copy_data;
- struct list_head sb_remount;
- struct list_head sb_kern_mount;
- struct list_head sb_show_options;
- struct list_head sb_statfs;
- struct list_head sb_mount;
- struct list_head sb_umount;
- struct list_head sb_pivotroot;
- struct list_head sb_set_mnt_opts;
- struct list_head sb_clone_mnt_opts;
- struct list_head sb_parse_opts_str;
- struct list_head dentry_init_security;
- struct list_head dentry_create_files_as;
+enum security_hook_index {
+ LSM_binder_set_context_mgr,
+ LSM_binder_transaction,
+ LSM_binder_transfer_binder,
+ LSM_binder_transfer_file,
+ LSM_ptrace_access_check,
+ LSM_ptrace_traceme,
+ LSM_capget,
+ LSM_capset,
+ LSM_capable,
+ LSM_quotactl,
+ LSM_quota_on,
+ LSM_syslog,
+ LSM_settime,
+ LSM_vm_enough_memory,
+ LSM_bprm_set_creds,
+ LSM_bprm_check_security,
+ LSM_bprm_secureexec,
+ LSM_bprm_committing_creds,
+ LSM_bprm_committed_creds,
+ LSM_sb_alloc_security,
+ LSM_sb_free_security,
+ LSM_sb_copy_data,
+ LSM_sb_remount,
+ LSM_sb_kern_mount,
+ LSM_sb_show_options,
+ LSM_sb_statfs,
+ LSM_sb_mount,
+ LSM_sb_umount,
+ LSM_sb_pivotroot,
+ LSM_sb_set_mnt_opts,
+ LSM_sb_clone_mnt_opts,
+ LSM_sb_parse_opts_str,
+ LSM_dentry_init_security,
+ LSM_dentry_create_files_as,
#ifdef CONFIG_SECURITY_PATH
- struct list_head path_unlink;
- struct list_head path_mkdir;
- struct list_head path_rmdir;
- struct list_head path_mknod;
- struct list_head path_truncate;
- struct list_head path_symlink;
- struct list_head path_link;
- struct list_head path_rename;
- struct list_head path_chmod;
- struct list_head path_chown;
- struct list_head path_chroot;
+ LSM_path_unlink,
+ LSM_path_mkdir,
+ LSM_path_rmdir,
+ LSM_path_mknod,
+ LSM_path_truncate,
+ LSM_path_symlink,
+ LSM_path_link,
+ LSM_path_rename,
+ LSM_path_chmod,
+ LSM_path_chown,
+ LSM_path_chroot,
#endif
- struct list_head inode_alloc_security;
- struct list_head inode_free_security;
- struct list_head inode_init_security;
- struct list_head inode_create;
- struct list_head inode_link;
- struct list_head inode_unlink;
- struct list_head inode_symlink;
- struct list_head inode_mkdir;
- struct list_head inode_rmdir;
- struct list_head inode_mknod;
- struct list_head inode_rename;
- struct list_head inode_readlink;
- struct list_head inode_follow_link;
- struct list_head inode_permission;
- struct list_head inode_setattr;
- struct list_head inode_getattr;
- struct list_head inode_setxattr;
- struct list_head inode_post_setxattr;
- struct list_head inode_getxattr;
- struct list_head inode_listxattr;
- struct list_head inode_removexattr;
- struct list_head inode_need_killpriv;
- struct list_head inode_killpriv;
- struct list_head inode_getsecurity;
- struct list_head inode_setsecurity;
- struct list_head inode_listsecurity;
- struct list_head inode_getsecid;
- struct list_head inode_copy_up;
- struct list_head inode_copy_up_xattr;
- struct list_head file_permission;
- struct list_head file_alloc_security;
- struct list_head file_free_security;
- struct list_head file_ioctl;
- struct list_head mmap_addr;
- struct list_head mmap_file;
- struct list_head file_mprotect;
- struct list_head file_lock;
- struct list_head file_fcntl;
- struct list_head file_set_fowner;
- struct list_head file_send_sigiotask;
- struct list_head file_receive;
- struct list_head file_open;
- struct list_head task_create;
- struct list_head task_alloc;
- struct list_head task_free;
- struct list_head cred_alloc_blank;
- struct list_head cred_free;
- struct list_head cred_prepare;
- struct list_head cred_transfer;
- struct list_head kernel_act_as;
- struct list_head kernel_create_files_as;
- struct list_head kernel_read_file;
- struct list_head kernel_post_read_file;
- struct list_head kernel_module_request;
- struct list_head task_fix_setuid;
- struct list_head task_setpgid;
- struct list_head task_getpgid;
- struct list_head task_getsid;
- struct list_head task_getsecid;
- struct list_head task_setnice;
- struct list_head task_setioprio;
- struct list_head task_getioprio;
- struct list_head task_prlimit;
- struct list_head task_setrlimit;
- struct list_head task_setscheduler;
- struct list_head task_getscheduler;
- struct list_head task_movememory;
- struct list_head task_kill;
- struct list_head task_prctl;
- struct list_head task_to_inode;
- struct list_head ipc_permission;
- struct list_head ipc_getsecid;
- struct list_head msg_msg_alloc_security;
- struct list_head msg_msg_free_security;
- struct list_head msg_queue_alloc_security;
- struct list_head msg_queue_free_security;
- struct list_head msg_queue_associate;
- struct list_head msg_queue_msgctl;
- struct list_head msg_queue_msgsnd;
- struct list_head msg_queue_msgrcv;
- struct list_head shm_alloc_security;
- struct list_head shm_free_security;
- struct list_head shm_associate;
- struct list_head shm_shmctl;
- struct list_head shm_shmat;
- struct list_head sem_alloc_security;
- struct list_head sem_free_security;
- struct list_head sem_associate;
- struct list_head sem_semctl;
- struct list_head sem_semop;
- struct list_head netlink_send;
- struct list_head d_instantiate;
- struct list_head getprocattr;
- struct list_head setprocattr;
- struct list_head ismaclabel;
- struct list_head secid_to_secctx;
- struct list_head secctx_to_secid;
- struct list_head release_secctx;
- struct list_head inode_invalidate_secctx;
- struct list_head inode_notifysecctx;
- struct list_head inode_setsecctx;
- struct list_head inode_getsecctx;
+ LSM_inode_alloc_security,
+ LSM_inode_free_security,
+ LSM_inode_init_security,
+ LSM_inode_create,
+ LSM_inode_link,
+ LSM_inode_unlink,
+ LSM_inode_symlink,
+ LSM_inode_mkdir,
+ LSM_inode_rmdir,
+ LSM_inode_mknod,
+ LSM_inode_rename,
+ LSM_inode_readlink,
+ LSM_inode_follow_link,
+ LSM_inode_permission,
+ LSM_inode_setattr,
+ LSM_inode_getattr,
+ LSM_inode_setxattr,
+ LSM_inode_post_setxattr,
+ LSM_inode_getxattr,
+ LSM_inode_listxattr,
+ LSM_inode_removexattr,
+ LSM_inode_need_killpriv,
+ LSM_inode_killpriv,
+ LSM_inode_getsecurity,
+ LSM_inode_setsecurity,
+ LSM_inode_listsecurity,
+ LSM_inode_getsecid,
+ LSM_inode_copy_up,
+ LSM_inode_copy_up_xattr,
+ LSM_file_permission,
+ LSM_file_alloc_security,
+ LSM_file_free_security,
+ LSM_file_ioctl,
+ LSM_mmap_addr,
+ LSM_mmap_file,
+ LSM_file_mprotect,
+ LSM_file_lock,
+ LSM_file_fcntl,
+ LSM_file_set_fowner,
+ LSM_file_send_sigiotask,
+ LSM_file_receive,
+ LSM_file_open,
+ LSM_task_create,
+ LSM_task_alloc,
+ LSM_task_free,
+ LSM_cred_alloc_blank,
+ LSM_cred_free,
+ LSM_cred_prepare,
+ LSM_cred_transfer,
+ LSM_kernel_act_as,
+ LSM_kernel_create_files_as,
+ LSM_kernel_read_file,
+ LSM_kernel_post_read_file,
+ LSM_kernel_module_request,
+ LSM_task_fix_setuid,
+ LSM_task_setpgid,
+ LSM_task_getpgid,
+ LSM_task_getsid,
+ LSM_task_getsecid,
+ LSM_task_setnice,
+ LSM_task_setioprio,
+ LSM_task_getioprio,
+ LSM_task_prlimit,
+ LSM_task_setrlimit,
+ LSM_task_setscheduler,
+ LSM_task_getscheduler,
+ LSM_task_movememory,
+ LSM_task_kill,
+ LSM_task_prctl,
+ LSM_task_to_inode,
+ LSM_ipc_permission,
+ LSM_ipc_getsecid,
+ LSM_msg_msg_alloc_security,
+ LSM_msg_msg_free_security,
+ LSM_msg_queue_alloc_security,
+ LSM_msg_queue_free_security,
+ LSM_msg_queue_associate,
+ LSM_msg_queue_msgctl,
+ LSM_msg_queue_msgsnd,
+ LSM_msg_queue_msgrcv,
+ LSM_shm_alloc_security,
+ LSM_shm_free_security,
+ LSM_shm_associate,
+ LSM_shm_shmctl,
+ LSM_shm_shmat,
+ LSM_sem_alloc_security,
+ LSM_sem_free_security,
+ LSM_sem_associate,
+ LSM_sem_semctl,
+ LSM_sem_semop,
+ LSM_netlink_send,
+ LSM_d_instantiate,
+ LSM_getprocattr,
+ LSM_setprocattr,
+ LSM_ismaclabel,
+ LSM_secid_to_secctx,
+ LSM_secctx_to_secid,
+ LSM_release_secctx,
+ LSM_inode_invalidate_secctx,
+ LSM_inode_notifysecctx,
+ LSM_inode_setsecctx,
+ LSM_inode_getsecctx,
#ifdef CONFIG_SECURITY_NETWORK
- struct list_head unix_stream_connect;
- struct list_head unix_may_send;
- struct list_head socket_create;
- struct list_head socket_post_create;
- struct list_head socket_bind;
- struct list_head socket_connect;
- struct list_head socket_listen;
- struct list_head socket_accept;
- struct list_head socket_sendmsg;
- struct list_head socket_recvmsg;
- struct list_head socket_getsockname;
- struct list_head socket_getpeername;
- struct list_head socket_getsockopt;
- struct list_head socket_setsockopt;
- struct list_head socket_shutdown;
- struct list_head socket_sock_rcv_skb;
- struct list_head socket_getpeersec_stream;
- struct list_head socket_getpeersec_dgram;
- struct list_head sk_alloc_security;
- struct list_head sk_free_security;
- struct list_head sk_clone_security;
- struct list_head sk_getsecid;
- struct list_head sock_graft;
- struct list_head inet_conn_request;
- struct list_head inet_csk_clone;
- struct list_head inet_conn_established;
- struct list_head secmark_relabel_packet;
- struct list_head secmark_refcount_inc;
- struct list_head secmark_refcount_dec;
- struct list_head req_classify_flow;
- struct list_head tun_dev_alloc_security;
- struct list_head tun_dev_free_security;
- struct list_head tun_dev_create;
- struct list_head tun_dev_attach_queue;
- struct list_head tun_dev_attach;
- struct list_head tun_dev_open;
+ LSM_unix_stream_connect,
+ LSM_unix_may_send,
+ LSM_socket_create,
+ LSM_socket_post_create,
+ LSM_socket_bind,
+ LSM_socket_connect,
+ LSM_socket_listen,
+ LSM_socket_accept,
+ LSM_socket_sendmsg,
+ LSM_socket_recvmsg,
+ LSM_socket_getsockname,
+ LSM_socket_getpeername,
+ LSM_socket_getsockopt,
+ LSM_socket_setsockopt,
+ LSM_socket_shutdown,
+ LSM_socket_sock_rcv_skb,
+ LSM_socket_getpeersec_stream,
+ LSM_socket_getpeersec_dgram,
+ LSM_sk_alloc_security,
+ LSM_sk_free_security,
+ LSM_sk_clone_security,
+ LSM_sk_getsecid,
+ LSM_sock_graft,
+ LSM_inet_conn_request,
+ LSM_inet_csk_clone,
+ LSM_inet_conn_established,
+ LSM_secmark_relabel_packet,
+ LSM_secmark_refcount_inc,
+ LSM_secmark_refcount_dec,
+ LSM_req_classify_flow,
+ LSM_tun_dev_alloc_security,
+ LSM_tun_dev_free_security,
+ LSM_tun_dev_create,
+ LSM_tun_dev_attach_queue,
+ LSM_tun_dev_attach,
+ LSM_tun_dev_open,
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_INFINIBAND
- struct list_head ib_pkey_access;
- struct list_head ib_endport_manage_subnet;
- struct list_head ib_alloc_security;
- struct list_head ib_free_security;
+ LSM_ib_pkey_access,
+ LSM_ib_endport_manage_subnet,
+ LSM_ib_alloc_security,
+ LSM_ib_free_security,
#endif /* CONFIG_SECURITY_INFINIBAND */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
- struct list_head xfrm_policy_alloc_security;
- struct list_head xfrm_policy_clone_security;
- struct list_head xfrm_policy_free_security;
- struct list_head xfrm_policy_delete_security;
- struct list_head xfrm_state_alloc;
- struct list_head xfrm_state_alloc_acquire;
- struct list_head xfrm_state_free_security;
- struct list_head xfrm_state_delete_security;
- struct list_head xfrm_policy_lookup;
- struct list_head xfrm_state_pol_flow_match;
- struct list_head xfrm_decode_session;
+ LSM_xfrm_policy_alloc_security,
+ LSM_xfrm_policy_clone_security,
+ LSM_xfrm_policy_free_security,
+ LSM_xfrm_policy_delete_security,
+ LSM_xfrm_state_alloc,
+ LSM_xfrm_state_alloc_acquire,
+ LSM_xfrm_state_free_security,
+ LSM_xfrm_state_delete_security,
+ LSM_xfrm_policy_lookup,
+ LSM_xfrm_state_pol_flow_match,
+ LSM_xfrm_decode_session,
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
#ifdef CONFIG_KEYS
- struct list_head key_alloc;
- struct list_head key_free;
- struct list_head key_permission;
- struct list_head key_getsecurity;
+ LSM_key_alloc,
+ LSM_key_free,
+ LSM_key_permission,
+ LSM_key_getsecurity,
#endif /* CONFIG_KEYS */
#ifdef CONFIG_AUDIT
- struct list_head audit_rule_init;
- struct list_head audit_rule_known;
- struct list_head audit_rule_match;
- struct list_head audit_rule_free;
+ LSM_audit_rule_init,
+ LSM_audit_rule_known,
+ LSM_audit_rule_match,
+ LSM_audit_rule_free,
#endif /* CONFIG_AUDIT */
+ LSM_MAX_HOOK_INDEX,
};
/*
@@ -1921,8 +1922,8 @@ struct security_hook_heads {
*/
struct security_hook_list {
struct list_head list;
- struct list_head *head;
union security_list_options hook;
+ enum security_hook_index idx;
char *lsm;
};
@@ -1933,9 +1934,8 @@ struct security_hook_list {
* text involved.
*/
#define LSM_HOOK_INIT(HEAD, HOOK) \
- { .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } }
+ { .idx = LSM_##HEAD, .hook = { .HEAD = HOOK } }
-extern struct security_hook_heads security_hook_heads;
extern char *lsm_names;
extern void security_add_hooks(struct security_hook_list *hooks, int count,
diff --git a/security/security.c b/security/security.c
index 3013237..44c47b6 100644
--- a/security/security.c
+++ b/security/security.c
@@ -34,7 +34,8 @@
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
-struct security_hook_heads security_hook_heads __lsm_ro_after_init;
+static struct list_head hook_heads[LSM_MAX_HOOK_INDEX]
+ __lsm_ro_after_init;
static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);
char *lsm_names;
@@ -59,12 +60,10 @@ static void __init do_security_initcalls(void)
*/
int __init security_init(void)
{
- int i;
- struct list_head *list = (struct list_head *) &security_hook_heads;
+ enum security_hook_index i;
- for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct list_head);
- i++)
- INIT_LIST_HEAD(&list[i]);
+ for (i = 0; i < LSM_MAX_HOOK_INDEX; i++)
+ INIT_LIST_HEAD(&hook_heads[i]);
pr_info("Security Framework initialized\n");
/*
@@ -161,8 +160,12 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
int i;
for (i = 0; i < count; i++) {
+ enum security_hook_index idx = hooks[i].idx;
+
hooks[i].lsm = lsm;
- list_add_tail_rcu(&hooks[i].list, hooks[i].head);
+ /* Can't hit this BUG_ON() unless LSM_HOOK_INIT() is broken. */
+ BUG_ON(idx < 0 || idx >= LSM_MAX_HOOK_INDEX);
+ list_add_tail_rcu(&hooks[i].list, &hook_heads[idx]);
}
if (lsm_append(lsm, &lsm_names) < 0)
panic("%s - Cannot get early memory.\n", __func__);
@@ -200,7 +203,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
do { \
struct security_hook_list *P; \
\
- list_for_each_entry(P, &security_hook_heads.FUNC, list) \
+ list_for_each_entry(P, &hook_heads[LSM_##FUNC], list) \
P->hook.FUNC(__VA_ARGS__); \
} while (0)
@@ -209,7 +212,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
do { \
struct security_hook_list *P; \
\
- list_for_each_entry(P, &security_hook_heads.FUNC, list) { \
+ list_for_each_entry(P, &hook_heads[LSM_##FUNC], list) { \
RC = P->hook.FUNC(__VA_ARGS__); \
if (RC != 0) \
break; \
@@ -316,7 +319,7 @@ int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
* agree that it should be set it will. If any module
* thinks it should not be set it won't.
*/
- list_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_vm_enough_memory], list) {
rc = hp->hook.vm_enough_memory(mm, pages);
if (rc <= 0) {
cap_sys_admin = 0;
@@ -809,7 +812,7 @@ int security_inode_getsecurity(struct inode *inode, const char *name, void **buf
/*
* Only one module will provide an attribute with a given name.
*/
- list_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_inode_getsecurity], list) {
rc = hp->hook.inode_getsecurity(inode, name, buffer, alloc);
if (rc != -EOPNOTSUPP)
return rc;
@@ -827,7 +830,7 @@ int security_inode_setsecurity(struct inode *inode, const char *name, const void
/*
* Only one module will provide an attribute with a given name.
*/
- list_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_inode_setsecurity], list) {
rc = hp->hook.inode_setsecurity(inode, name, value, size,
flags);
if (rc != -EOPNOTSUPP)
@@ -1135,7 +1138,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
int rc = -ENOSYS;
struct security_hook_list *hp;
- list_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_task_prctl], list) {
thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
if (thisrc != -ENOSYS) {
rc = thisrc;
@@ -1638,7 +1641,7 @@ int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
* For speed optimization, we explicitly break the loop rather than
* using the macro
*/
- list_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
+ list_for_each_entry(hp, &hook_heads[LSM_xfrm_state_pol_flow_match],
list) {
rc = hp->hook.xfrm_state_pol_flow_match(x, xp, fl);
break;
--
2.9.3
--
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^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head
2017-06-26 14:41 [PATCH v7 0/3] ro protection for dynamic data Igor Stoppa
@ 2017-06-26 14:41 ` Igor Stoppa
0 siblings, 0 replies; 10+ messages in thread
From: Igor Stoppa @ 2017-06-26 14:41 UTC (permalink / raw)
To: keescook, mhocko, jmorris, labbott
Cc: penguin-kernel, paul, sds, casey, hch, linux-security-module,
linux-mm, linux-kernel, kernel-hardening, James Morris,
Igor Stoppa
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Commit 3dfc9b02864b19f4 ("LSM: Initialize security_hook_heads upon
registration.") treats "struct security_hook_heads" as an implicit array
of "struct list_head" so that we can eliminate code for static
initialization. Although we haven't encountered compilers which do not
treat sizeof(security_hook_heads) != sizeof(struct list_head) *
(sizeof(security_hook_heads) / sizeof(struct list_head)), Casey does not
like the assumption that a structure of N elements can be assumed to be
the same as an array of N elements.
Now that Kees found that randstruct complains about such casting
security/security.c: In function 'security_init':
security/security.c:59:20: note: found mismatched op0 struct pointer
types: 'struct list_head' and 'struct security_hook_heads'
struct list_head *list = (struct list_head *) &security_hook_heads;
and Christoph thinks that we should fix it rather than make randstruct
whitelist it, this patch fixes it.
It would be possible to revert commit 3dfc9b02864b19f4, but this patch
converts security_hook_heads into an explicit array of struct list_head
by introducing an enum, due to reasons explained below.
Igor proposed a sealable memory allocator, and the LSM hooks
("struct security_hook_heads security_hook_heads" and
"struct security_hook_list ...[]") will benefit from that allocator via
protection using set_memory_ro()/set_memory_rw(), and that allocator
will remove CONFIG_SECURITY_WRITABLE_HOOKS config option. Thus, we will
likely be moving to that direction.
This means that these structures will be allocated at run time using
that allocator, and therefore the address of these structures will be
determined at run time rather than compile time.
But currently, LSM_HOOK_INIT() macro depends on the address of
security_hook_heads being known at compile time. If we use an enum
so that LSM_HOOK_INIT() macro does not need to know absolute address of
security_hook_heads, it will help us to use that allocator for LSM hooks.
As a result of introducing an enum, security_hook_heads becomes a local
variable. In order to pass 80 columns check by scripts/checkpatch.pl ,
rename security_hook_heads to hook_heads.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Rebased-by: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Igor Stoppa <igor.stoppa@huawei.com>
Cc: Christoph Hellwig <hch@infradead.org>
---
include/linux/lsm_hooks.h | 420 +++++++++++++++++++++++-----------------------
security/security.c | 31 ++--
2 files changed, 227 insertions(+), 224 deletions(-)
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 3cc9d77..32f30fa 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1694,225 +1694,226 @@ union security_list_options {
#endif /* CONFIG_AUDIT */
};
-struct security_hook_heads {
- struct list_head binder_set_context_mgr;
- struct list_head binder_transaction;
- struct list_head binder_transfer_binder;
- struct list_head binder_transfer_file;
- struct list_head ptrace_access_check;
- struct list_head ptrace_traceme;
- struct list_head capget;
- struct list_head capset;
- struct list_head capable;
- struct list_head quotactl;
- struct list_head quota_on;
- struct list_head syslog;
- struct list_head settime;
- struct list_head vm_enough_memory;
- struct list_head bprm_set_creds;
- struct list_head bprm_check_security;
- struct list_head bprm_secureexec;
- struct list_head bprm_committing_creds;
- struct list_head bprm_committed_creds;
- struct list_head sb_alloc_security;
- struct list_head sb_free_security;
- struct list_head sb_copy_data;
- struct list_head sb_remount;
- struct list_head sb_kern_mount;
- struct list_head sb_show_options;
- struct list_head sb_statfs;
- struct list_head sb_mount;
- struct list_head sb_umount;
- struct list_head sb_pivotroot;
- struct list_head sb_set_mnt_opts;
- struct list_head sb_clone_mnt_opts;
- struct list_head sb_parse_opts_str;
- struct list_head dentry_init_security;
- struct list_head dentry_create_files_as;
+enum security_hook_index {
+ LSM_binder_set_context_mgr,
+ LSM_binder_transaction,
+ LSM_binder_transfer_binder,
+ LSM_binder_transfer_file,
+ LSM_ptrace_access_check,
+ LSM_ptrace_traceme,
+ LSM_capget,
+ LSM_capset,
+ LSM_capable,
+ LSM_quotactl,
+ LSM_quota_on,
+ LSM_syslog,
+ LSM_settime,
+ LSM_vm_enough_memory,
+ LSM_bprm_set_creds,
+ LSM_bprm_check_security,
+ LSM_bprm_secureexec,
+ LSM_bprm_committing_creds,
+ LSM_bprm_committed_creds,
+ LSM_sb_alloc_security,
+ LSM_sb_free_security,
+ LSM_sb_copy_data,
+ LSM_sb_remount,
+ LSM_sb_kern_mount,
+ LSM_sb_show_options,
+ LSM_sb_statfs,
+ LSM_sb_mount,
+ LSM_sb_umount,
+ LSM_sb_pivotroot,
+ LSM_sb_set_mnt_opts,
+ LSM_sb_clone_mnt_opts,
+ LSM_sb_parse_opts_str,
+ LSM_dentry_init_security,
+ LSM_dentry_create_files_as,
#ifdef CONFIG_SECURITY_PATH
- struct list_head path_unlink;
- struct list_head path_mkdir;
- struct list_head path_rmdir;
- struct list_head path_mknod;
- struct list_head path_truncate;
- struct list_head path_symlink;
- struct list_head path_link;
- struct list_head path_rename;
- struct list_head path_chmod;
- struct list_head path_chown;
- struct list_head path_chroot;
+ LSM_path_unlink,
+ LSM_path_mkdir,
+ LSM_path_rmdir,
+ LSM_path_mknod,
+ LSM_path_truncate,
+ LSM_path_symlink,
+ LSM_path_link,
+ LSM_path_rename,
+ LSM_path_chmod,
+ LSM_path_chown,
+ LSM_path_chroot,
#endif
- struct list_head inode_alloc_security;
- struct list_head inode_free_security;
- struct list_head inode_init_security;
- struct list_head inode_create;
- struct list_head inode_link;
- struct list_head inode_unlink;
- struct list_head inode_symlink;
- struct list_head inode_mkdir;
- struct list_head inode_rmdir;
- struct list_head inode_mknod;
- struct list_head inode_rename;
- struct list_head inode_readlink;
- struct list_head inode_follow_link;
- struct list_head inode_permission;
- struct list_head inode_setattr;
- struct list_head inode_getattr;
- struct list_head inode_setxattr;
- struct list_head inode_post_setxattr;
- struct list_head inode_getxattr;
- struct list_head inode_listxattr;
- struct list_head inode_removexattr;
- struct list_head inode_need_killpriv;
- struct list_head inode_killpriv;
- struct list_head inode_getsecurity;
- struct list_head inode_setsecurity;
- struct list_head inode_listsecurity;
- struct list_head inode_getsecid;
- struct list_head inode_copy_up;
- struct list_head inode_copy_up_xattr;
- struct list_head file_permission;
- struct list_head file_alloc_security;
- struct list_head file_free_security;
- struct list_head file_ioctl;
- struct list_head mmap_addr;
- struct list_head mmap_file;
- struct list_head file_mprotect;
- struct list_head file_lock;
- struct list_head file_fcntl;
- struct list_head file_set_fowner;
- struct list_head file_send_sigiotask;
- struct list_head file_receive;
- struct list_head file_open;
- struct list_head task_create;
- struct list_head task_alloc;
- struct list_head task_free;
- struct list_head cred_alloc_blank;
- struct list_head cred_free;
- struct list_head cred_prepare;
- struct list_head cred_transfer;
- struct list_head kernel_act_as;
- struct list_head kernel_create_files_as;
- struct list_head kernel_read_file;
- struct list_head kernel_post_read_file;
- struct list_head kernel_module_request;
- struct list_head task_fix_setuid;
- struct list_head task_setpgid;
- struct list_head task_getpgid;
- struct list_head task_getsid;
- struct list_head task_getsecid;
- struct list_head task_setnice;
- struct list_head task_setioprio;
- struct list_head task_getioprio;
- struct list_head task_prlimit;
- struct list_head task_setrlimit;
- struct list_head task_setscheduler;
- struct list_head task_getscheduler;
- struct list_head task_movememory;
- struct list_head task_kill;
- struct list_head task_prctl;
- struct list_head task_to_inode;
- struct list_head ipc_permission;
- struct list_head ipc_getsecid;
- struct list_head msg_msg_alloc_security;
- struct list_head msg_msg_free_security;
- struct list_head msg_queue_alloc_security;
- struct list_head msg_queue_free_security;
- struct list_head msg_queue_associate;
- struct list_head msg_queue_msgctl;
- struct list_head msg_queue_msgsnd;
- struct list_head msg_queue_msgrcv;
- struct list_head shm_alloc_security;
- struct list_head shm_free_security;
- struct list_head shm_associate;
- struct list_head shm_shmctl;
- struct list_head shm_shmat;
- struct list_head sem_alloc_security;
- struct list_head sem_free_security;
- struct list_head sem_associate;
- struct list_head sem_semctl;
- struct list_head sem_semop;
- struct list_head netlink_send;
- struct list_head d_instantiate;
- struct list_head getprocattr;
- struct list_head setprocattr;
- struct list_head ismaclabel;
- struct list_head secid_to_secctx;
- struct list_head secctx_to_secid;
- struct list_head release_secctx;
- struct list_head inode_invalidate_secctx;
- struct list_head inode_notifysecctx;
- struct list_head inode_setsecctx;
- struct list_head inode_getsecctx;
+ LSM_inode_alloc_security,
+ LSM_inode_free_security,
+ LSM_inode_init_security,
+ LSM_inode_create,
+ LSM_inode_link,
+ LSM_inode_unlink,
+ LSM_inode_symlink,
+ LSM_inode_mkdir,
+ LSM_inode_rmdir,
+ LSM_inode_mknod,
+ LSM_inode_rename,
+ LSM_inode_readlink,
+ LSM_inode_follow_link,
+ LSM_inode_permission,
+ LSM_inode_setattr,
+ LSM_inode_getattr,
+ LSM_inode_setxattr,
+ LSM_inode_post_setxattr,
+ LSM_inode_getxattr,
+ LSM_inode_listxattr,
+ LSM_inode_removexattr,
+ LSM_inode_need_killpriv,
+ LSM_inode_killpriv,
+ LSM_inode_getsecurity,
+ LSM_inode_setsecurity,
+ LSM_inode_listsecurity,
+ LSM_inode_getsecid,
+ LSM_inode_copy_up,
+ LSM_inode_copy_up_xattr,
+ LSM_file_permission,
+ LSM_file_alloc_security,
+ LSM_file_free_security,
+ LSM_file_ioctl,
+ LSM_mmap_addr,
+ LSM_mmap_file,
+ LSM_file_mprotect,
+ LSM_file_lock,
+ LSM_file_fcntl,
+ LSM_file_set_fowner,
+ LSM_file_send_sigiotask,
+ LSM_file_receive,
+ LSM_file_open,
+ LSM_task_create,
+ LSM_task_alloc,
+ LSM_task_free,
+ LSM_cred_alloc_blank,
+ LSM_cred_free,
+ LSM_cred_prepare,
+ LSM_cred_transfer,
+ LSM_kernel_act_as,
+ LSM_kernel_create_files_as,
+ LSM_kernel_read_file,
+ LSM_kernel_post_read_file,
+ LSM_kernel_module_request,
+ LSM_task_fix_setuid,
+ LSM_task_setpgid,
+ LSM_task_getpgid,
+ LSM_task_getsid,
+ LSM_task_getsecid,
+ LSM_task_setnice,
+ LSM_task_setioprio,
+ LSM_task_getioprio,
+ LSM_task_prlimit,
+ LSM_task_setrlimit,
+ LSM_task_setscheduler,
+ LSM_task_getscheduler,
+ LSM_task_movememory,
+ LSM_task_kill,
+ LSM_task_prctl,
+ LSM_task_to_inode,
+ LSM_ipc_permission,
+ LSM_ipc_getsecid,
+ LSM_msg_msg_alloc_security,
+ LSM_msg_msg_free_security,
+ LSM_msg_queue_alloc_security,
+ LSM_msg_queue_free_security,
+ LSM_msg_queue_associate,
+ LSM_msg_queue_msgctl,
+ LSM_msg_queue_msgsnd,
+ LSM_msg_queue_msgrcv,
+ LSM_shm_alloc_security,
+ LSM_shm_free_security,
+ LSM_shm_associate,
+ LSM_shm_shmctl,
+ LSM_shm_shmat,
+ LSM_sem_alloc_security,
+ LSM_sem_free_security,
+ LSM_sem_associate,
+ LSM_sem_semctl,
+ LSM_sem_semop,
+ LSM_netlink_send,
+ LSM_d_instantiate,
+ LSM_getprocattr,
+ LSM_setprocattr,
+ LSM_ismaclabel,
+ LSM_secid_to_secctx,
+ LSM_secctx_to_secid,
+ LSM_release_secctx,
+ LSM_inode_invalidate_secctx,
+ LSM_inode_notifysecctx,
+ LSM_inode_setsecctx,
+ LSM_inode_getsecctx,
#ifdef CONFIG_SECURITY_NETWORK
- struct list_head unix_stream_connect;
- struct list_head unix_may_send;
- struct list_head socket_create;
- struct list_head socket_post_create;
- struct list_head socket_bind;
- struct list_head socket_connect;
- struct list_head socket_listen;
- struct list_head socket_accept;
- struct list_head socket_sendmsg;
- struct list_head socket_recvmsg;
- struct list_head socket_getsockname;
- struct list_head socket_getpeername;
- struct list_head socket_getsockopt;
- struct list_head socket_setsockopt;
- struct list_head socket_shutdown;
- struct list_head socket_sock_rcv_skb;
- struct list_head socket_getpeersec_stream;
- struct list_head socket_getpeersec_dgram;
- struct list_head sk_alloc_security;
- struct list_head sk_free_security;
- struct list_head sk_clone_security;
- struct list_head sk_getsecid;
- struct list_head sock_graft;
- struct list_head inet_conn_request;
- struct list_head inet_csk_clone;
- struct list_head inet_conn_established;
- struct list_head secmark_relabel_packet;
- struct list_head secmark_refcount_inc;
- struct list_head secmark_refcount_dec;
- struct list_head req_classify_flow;
- struct list_head tun_dev_alloc_security;
- struct list_head tun_dev_free_security;
- struct list_head tun_dev_create;
- struct list_head tun_dev_attach_queue;
- struct list_head tun_dev_attach;
- struct list_head tun_dev_open;
+ LSM_unix_stream_connect,
+ LSM_unix_may_send,
+ LSM_socket_create,
+ LSM_socket_post_create,
+ LSM_socket_bind,
+ LSM_socket_connect,
+ LSM_socket_listen,
+ LSM_socket_accept,
+ LSM_socket_sendmsg,
+ LSM_socket_recvmsg,
+ LSM_socket_getsockname,
+ LSM_socket_getpeername,
+ LSM_socket_getsockopt,
+ LSM_socket_setsockopt,
+ LSM_socket_shutdown,
+ LSM_socket_sock_rcv_skb,
+ LSM_socket_getpeersec_stream,
+ LSM_socket_getpeersec_dgram,
+ LSM_sk_alloc_security,
+ LSM_sk_free_security,
+ LSM_sk_clone_security,
+ LSM_sk_getsecid,
+ LSM_sock_graft,
+ LSM_inet_conn_request,
+ LSM_inet_csk_clone,
+ LSM_inet_conn_established,
+ LSM_secmark_relabel_packet,
+ LSM_secmark_refcount_inc,
+ LSM_secmark_refcount_dec,
+ LSM_req_classify_flow,
+ LSM_tun_dev_alloc_security,
+ LSM_tun_dev_free_security,
+ LSM_tun_dev_create,
+ LSM_tun_dev_attach_queue,
+ LSM_tun_dev_attach,
+ LSM_tun_dev_open,
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_INFINIBAND
- struct list_head ib_pkey_access;
- struct list_head ib_endport_manage_subnet;
- struct list_head ib_alloc_security;
- struct list_head ib_free_security;
+ LSM_ib_pkey_access,
+ LSM_ib_endport_manage_subnet,
+ LSM_ib_alloc_security,
+ LSM_ib_free_security,
#endif /* CONFIG_SECURITY_INFINIBAND */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
- struct list_head xfrm_policy_alloc_security;
- struct list_head xfrm_policy_clone_security;
- struct list_head xfrm_policy_free_security;
- struct list_head xfrm_policy_delete_security;
- struct list_head xfrm_state_alloc;
- struct list_head xfrm_state_alloc_acquire;
- struct list_head xfrm_state_free_security;
- struct list_head xfrm_state_delete_security;
- struct list_head xfrm_policy_lookup;
- struct list_head xfrm_state_pol_flow_match;
- struct list_head xfrm_decode_session;
+ LSM_xfrm_policy_alloc_security,
+ LSM_xfrm_policy_clone_security,
+ LSM_xfrm_policy_free_security,
+ LSM_xfrm_policy_delete_security,
+ LSM_xfrm_state_alloc,
+ LSM_xfrm_state_alloc_acquire,
+ LSM_xfrm_state_free_security,
+ LSM_xfrm_state_delete_security,
+ LSM_xfrm_policy_lookup,
+ LSM_xfrm_state_pol_flow_match,
+ LSM_xfrm_decode_session,
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
#ifdef CONFIG_KEYS
- struct list_head key_alloc;
- struct list_head key_free;
- struct list_head key_permission;
- struct list_head key_getsecurity;
+ LSM_key_alloc,
+ LSM_key_free,
+ LSM_key_permission,
+ LSM_key_getsecurity,
#endif /* CONFIG_KEYS */
#ifdef CONFIG_AUDIT
- struct list_head audit_rule_init;
- struct list_head audit_rule_known;
- struct list_head audit_rule_match;
- struct list_head audit_rule_free;
+ LSM_audit_rule_init,
+ LSM_audit_rule_known,
+ LSM_audit_rule_match,
+ LSM_audit_rule_free,
#endif /* CONFIG_AUDIT */
+ LSM_MAX_HOOK_INDEX,
};
/*
@@ -1921,8 +1922,8 @@ struct security_hook_heads {
*/
struct security_hook_list {
struct list_head list;
- struct list_head *head;
union security_list_options hook;
+ enum security_hook_index idx;
char *lsm;
};
@@ -1933,9 +1934,8 @@ struct security_hook_list {
* text involved.
*/
#define LSM_HOOK_INIT(HEAD, HOOK) \
- { .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } }
+ { .idx = LSM_##HEAD, .hook = { .HEAD = HOOK } }
-extern struct security_hook_heads security_hook_heads;
extern char *lsm_names;
extern void security_add_hooks(struct security_hook_list *hooks, int count,
diff --git a/security/security.c b/security/security.c
index 3013237..44c47b6 100644
--- a/security/security.c
+++ b/security/security.c
@@ -34,7 +34,8 @@
/* Maximum number of letters for an LSM name string */
#define SECURITY_NAME_MAX 10
-struct security_hook_heads security_hook_heads __lsm_ro_after_init;
+static struct list_head hook_heads[LSM_MAX_HOOK_INDEX]
+ __lsm_ro_after_init;
static ATOMIC_NOTIFIER_HEAD(lsm_notifier_chain);
char *lsm_names;
@@ -59,12 +60,10 @@ static void __init do_security_initcalls(void)
*/
int __init security_init(void)
{
- int i;
- struct list_head *list = (struct list_head *) &security_hook_heads;
+ enum security_hook_index i;
- for (i = 0; i < sizeof(security_hook_heads) / sizeof(struct list_head);
- i++)
- INIT_LIST_HEAD(&list[i]);
+ for (i = 0; i < LSM_MAX_HOOK_INDEX; i++)
+ INIT_LIST_HEAD(&hook_heads[i]);
pr_info("Security Framework initialized\n");
/*
@@ -161,8 +160,12 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count,
int i;
for (i = 0; i < count; i++) {
+ enum security_hook_index idx = hooks[i].idx;
+
hooks[i].lsm = lsm;
- list_add_tail_rcu(&hooks[i].list, hooks[i].head);
+ /* Can't hit this BUG_ON() unless LSM_HOOK_INIT() is broken. */
+ BUG_ON(idx < 0 || idx >= LSM_MAX_HOOK_INDEX);
+ list_add_tail_rcu(&hooks[i].list, &hook_heads[idx]);
}
if (lsm_append(lsm, &lsm_names) < 0)
panic("%s - Cannot get early memory.\n", __func__);
@@ -200,7 +203,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
do { \
struct security_hook_list *P; \
\
- list_for_each_entry(P, &security_hook_heads.FUNC, list) \
+ list_for_each_entry(P, &hook_heads[LSM_##FUNC], list) \
P->hook.FUNC(__VA_ARGS__); \
} while (0)
@@ -209,7 +212,7 @@ EXPORT_SYMBOL(unregister_lsm_notifier);
do { \
struct security_hook_list *P; \
\
- list_for_each_entry(P, &security_hook_heads.FUNC, list) { \
+ list_for_each_entry(P, &hook_heads[LSM_##FUNC], list) { \
RC = P->hook.FUNC(__VA_ARGS__); \
if (RC != 0) \
break; \
@@ -316,7 +319,7 @@ int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
* agree that it should be set it will. If any module
* thinks it should not be set it won't.
*/
- list_for_each_entry(hp, &security_hook_heads.vm_enough_memory, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_vm_enough_memory], list) {
rc = hp->hook.vm_enough_memory(mm, pages);
if (rc <= 0) {
cap_sys_admin = 0;
@@ -809,7 +812,7 @@ int security_inode_getsecurity(struct inode *inode, const char *name, void **buf
/*
* Only one module will provide an attribute with a given name.
*/
- list_for_each_entry(hp, &security_hook_heads.inode_getsecurity, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_inode_getsecurity], list) {
rc = hp->hook.inode_getsecurity(inode, name, buffer, alloc);
if (rc != -EOPNOTSUPP)
return rc;
@@ -827,7 +830,7 @@ int security_inode_setsecurity(struct inode *inode, const char *name, const void
/*
* Only one module will provide an attribute with a given name.
*/
- list_for_each_entry(hp, &security_hook_heads.inode_setsecurity, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_inode_setsecurity], list) {
rc = hp->hook.inode_setsecurity(inode, name, value, size,
flags);
if (rc != -EOPNOTSUPP)
@@ -1135,7 +1138,7 @@ int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
int rc = -ENOSYS;
struct security_hook_list *hp;
- list_for_each_entry(hp, &security_hook_heads.task_prctl, list) {
+ list_for_each_entry(hp, &hook_heads[LSM_task_prctl], list) {
thisrc = hp->hook.task_prctl(option, arg2, arg3, arg4, arg5);
if (thisrc != -ENOSYS) {
rc = thisrc;
@@ -1638,7 +1641,7 @@ int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
* For speed optimization, we explicitly break the loop rather than
* using the macro
*/
- list_for_each_entry(hp, &security_hook_heads.xfrm_state_pol_flow_match,
+ list_for_each_entry(hp, &hook_heads[LSM_xfrm_state_pol_flow_match],
list) {
rc = hp->hook.xfrm_state_pol_flow_match(x, xp, fl);
break;
--
2.9.3
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^ permalink raw reply related [flat|nested] 10+ messages in thread
end of thread, other threads:[~2017-07-10 15:08 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-06-27 17:33 [PATCH v8 0/3] mm: LSM: ro protection for dynamic data Igor Stoppa
2017-06-27 17:33 ` [PATCH 1/3] Protectable memory support Igor Stoppa
2017-06-27 17:33 ` [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head Igor Stoppa
2017-06-27 17:33 ` [PATCH 3/3] Make LSM Writable Hooks a command line option Igor Stoppa
2017-06-27 17:51 ` Christoph Hellwig
2017-06-27 20:07 ` igor.stoppa
2017-06-28 8:25 ` Igor Stoppa
-- strict thread matches above, loose matches on Subject: below --
2017-07-10 15:06 [PATCH v10 0/3] mm: security: ro protection for dynamic data Igor Stoppa
2017-07-10 15:06 ` [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head Igor Stoppa
2017-07-05 13:46 [PATCH v9 0/3] mm: security: ro protection for dynamic data Igor Stoppa
2017-07-05 13:46 ` [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head Igor Stoppa
2017-06-26 14:41 [PATCH v7 0/3] ro protection for dynamic data Igor Stoppa
2017-06-26 14:41 ` [PATCH 2/3] LSM: Convert security_hook_heads into explicit array of struct list_head Igor Stoppa
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