linux-kernel - [PATCH 03/17] prmem: vmalloc support for dynamic allocation

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Date:   Wed, 24 Oct 2018 00:34:50 +0300
From:   Igor Stoppa <igor.stoppa@...il.com>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        Dave Chinner <david@...morbit.com>,
        James Morris <jmorris@...ei.org>,
        Michal Hocko <mhocko@...nel.org>,
        kernel-hardening@...ts.openwall.com,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org
Cc:     igor.stoppa@...wei.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Laura Abbott <labbott@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Chintan Pandya <cpandya@...eaurora.org>,
        Joe Perches <joe@...ches.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 03/17] prmem: vmalloc support for dynamic allocation

Prepare vmalloc for:
- tagging areas used for dynamic allocation of protected memory
- supporting various tags, related to the property that an area might have
- extrapolating the pool containing a given area
- chaining the areas in each pool
- extrapolating the area containing a given memory address

NOTE:
Since there is a list_head structure that is used only when disposing of
the allocation (the field purge_list), there are two pointers for the take,
before it comes the time of freeing the allocation.
To avoid increasing the size of the vmap_area structure, instead of
using a standard doubly linked list for tracking the chain of
vmap_areas, only one pointer is spent for this purpose, in a single
linked list, while the other is used to provide a direct connection to the
parent pool.

Signed-off-by: Igor Stoppa <igor.stoppa@...wei.com>
CC: Michal Hocko <mhocko@...nel.org>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Chintan Pandya <cpandya@...eaurora.org>
CC: Joe Perches <joe@...ches.com>
CC: "Luis R. Rodriguez" <mcgrof@...nel.org>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Kate Stewart <kstewart@...uxfoundation.org>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: Philippe Ombredanne <pombredanne@...b.com>
CC: linux-mm@...ck.org
CC: linux-kernel@...r.kernel.org
---
 include/linux/vmalloc.h | 12 +++++++++++-
 mm/vmalloc.c            |  2 +-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 398e9c95cd61..4d14a3b8089e 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -21,6 +21,9 @@ struct notifier_block;		/* in notifier.h */
 #define VM_UNINITIALIZED	0x00000020	/* vm_struct is not fully initialized */
 #define VM_NO_GUARD		0x00000040      /* don't add guard page */
 #define VM_KASAN		0x00000080      /* has allocated kasan shadow memory */
+#define VM_PMALLOC		0x00000100	/* pmalloc area - see docs */
+#define VM_PMALLOC_WR		0x00000200	/* pmalloc write rare area */
+#define VM_PMALLOC_PROTECTED	0x00000400	/* pmalloc protected area */
 /* bits [20..32] reserved for arch specific ioremap internals */
 
 /*
@@ -48,7 +51,13 @@ struct vmap_area {
 	unsigned long flags;
 	struct rb_node rb_node;         /* address sorted rbtree */
 	struct list_head list;          /* address sorted list */
-	struct llist_node purge_list;    /* "lazy purge" list */
+	union {
+		struct llist_node purge_list;    /* "lazy purge" list */
+		struct {
+			struct vmap_area *next;
+			struct pmalloc_pool *pool;
+		};
+	};
 	struct vm_struct *vm;
 	struct rcu_head rcu_head;
 };
@@ -134,6 +143,7 @@ extern struct vm_struct *__get_vm_area_caller(unsigned long size,
 					const void *caller);
 extern struct vm_struct *remove_vm_area(const void *addr);
 extern struct vm_struct *find_vm_area(const void *addr);
+extern struct vmap_area *find_vmap_area(unsigned long addr);
 
 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
 			struct page **pages);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index a728fc492557..15850005fea5 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -742,7 +742,7 @@ static void free_unmap_vmap_area(struct vmap_area *va)
 	free_vmap_area_noflush(va);
 }
 
-static struct vmap_area *find_vmap_area(unsigned long addr)
+struct vmap_area *find_vmap_area(unsigned long addr)
 {
 	struct vmap_area *va;
 
-- 
2.17.1