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Subject[patch 2/2] Access Control Lists for tmpfs
Add access control lists for tmpfs.

Signed-off-by: Andreas Gruenbacher <agruen@suse.de>

Index: linux-2.6.15-git4/fs/Kconfig
===================================================================
--- linux-2.6.15-git4.orig/fs/Kconfig
+++ linux-2.6.15-git4/fs/Kconfig
@@ -838,6 +838,19 @@ config TMPFS

See <file:Documentation/filesystems/tmpfs.txt> for details.

+config TMPFS_POSIX_ACL
+ bool "Tmpfs POSIX Access Control Lists"
+ depends on TMPFS
+ select GENERIC_ACL
+ help
+ POSIX Access Control Lists (ACLs) support permissions for users and
+ groups beyond the owner/group/world scheme.
+
+ To learn more about Access Control Lists, visit the POSIX ACLs for
+ Linux website <http://acl.bestbits.at/>.
+
+ If you don't know what Access Control Lists are, say N.
+
config HUGETLBFS
bool "HugeTLB file system support"
depends X86 || IA64 || PPC64 || SPARC64 || SUPERH || BROKEN
Index: linux-2.6.15-git4/include/linux/shmem_fs.h
===================================================================
--- linux-2.6.15-git4.orig/include/linux/shmem_fs.h
+++ linux-2.6.15-git4/include/linux/shmem_fs.h
@@ -3,6 +3,7 @@

#include <linux/swap.h>
#include <linux/mempolicy.h>
+#include <linux/generic_acl.h>

/* inode in-kernel data */

@@ -19,6 +20,10 @@ struct shmem_inode_info {
swp_entry_t i_direct[SHMEM_NR_DIRECT]; /* first blocks */
struct list_head swaplist; /* chain of maybes on swap */
struct inode vfs_inode;
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ struct posix_acl *i_acl;
+ struct posix_acl *i_default_acl;
+#endif
};

struct shmem_sb_info {
@@ -34,4 +39,39 @@ static inline struct shmem_inode_info *S
return container_of(inode, struct shmem_inode_info, vfs_inode);
}

+#ifdef CONFIG_TMPFS_POSIX_ACL
+extern struct generic_acl_operations shmem_acl_ops;
+extern struct xattr_handler shmem_xattr_acl_access_handler;
+extern struct xattr_handler shmem_xattr_acl_default_handler;
+
+int shmem_permission(struct inode *, int, struct nameidata *);
+void shmem_acl_destroy_inode(struct inode *);
+
+static inline int
+shmem_acl_init(struct inode *inode, struct inode *dir)
+{
+ return generic_acl_init(inode, dir, &shmem_acl_ops);
+}
+static inline int
+shmem_acl_chmod(struct inode *inode)
+{
+ return generic_acl_chmod(inode, &shmem_acl_ops);
+}
+#else
+static inline void
+shmem_acl_destroy_inode(struct inode *inode)
+{
+}
+static inline int
+shmem_acl_init(struct inode *inode, struct inode *dir)
+{
+ return 0;
+}
+static inline int
+shmem_acl_chmod(struct inode *inode)
+{
+ return 0;
+}
+#endif /* CONFIG_TMPFS_POSIX_ACL */
+
#endif
Index: linux-2.6.15-git4/mm/Makefile
===================================================================
--- linux-2.6.15-git4.orig/mm/Makefile
+++ linux-2.6.15-git4/mm/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_HUGETLBFS) += hugetlb.o
obj-$(CONFIG_NUMA) += mempolicy.o
obj-$(CONFIG_SPARSEMEM) += sparse.o
obj-$(CONFIG_SHMEM) += shmem.o
+obj-$(CONFIG_TMPFS_POSIX_ACL) += shmem_acl.o
obj-$(CONFIG_TINY_SHMEM) += tiny-shmem.o
obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o
obj-$(CONFIG_FS_XIP) += filemap_xip.o
Index: linux-2.6.15-git4/mm/shmem.c
===================================================================
--- linux-2.6.15-git4.orig/mm/shmem.c
+++ linux-2.6.15-git4/mm/shmem.c
@@ -28,6 +28,7 @@
#include <linux/init.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/fs.h>
+#include <linux/xattr.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/file.h>
@@ -175,6 +176,7 @@ static struct address_space_operations s
static struct file_operations shmem_file_operations;
static struct inode_operations shmem_inode_operations;
static struct inode_operations shmem_dir_inode_operations;
+static struct inode_operations shmem_special_inode_operations;
static struct vm_operations_struct shmem_vm_ops;

static struct backing_dev_info shmem_backing_dev_info __read_mostly = {
@@ -635,7 +637,7 @@ static int shmem_notify_change(struct de
struct page *page = NULL;
int error;

- if (attr->ia_valid & ATTR_SIZE) {
+ if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
if (attr->ia_size < inode->i_size) {
/*
* If truncating down to a partial page, then
@@ -668,6 +670,8 @@ static int shmem_notify_change(struct de
error = inode_change_ok(inode, attr);
if (!error)
error = inode_setattr(inode, attr);
+ if (!error && (attr->ia_valid & ATTR_MODE))
+ error = shmem_acl_chmod(inode);
if (page)
page_cache_release(page);
return error;
@@ -1311,6 +1315,7 @@ shmem_get_inode(struct super_block *sb,

switch (mode & S_IFMT) {
default:
+ inode->i_op = &shmem_special_inode_operations;
init_special_inode(inode, mode, dev);
break;
case S_IFREG:
@@ -1629,7 +1634,11 @@ shmem_mknod(struct inode *dir, struct de
iput(inode);
return error;
}
- error = 0;
+ }
+ error = shmem_acl_init(inode, dir);
+ if (error) {
+ iput(inode);
+ return error;
}
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
@@ -1843,6 +1852,50 @@ static struct inode_operations shmem_sym
.put_link = shmem_put_link,
};

+#ifdef CONFIG_TMPFS_POSIX_ACL
+/* The vfs implements defaults for the security.* xattr namespace for inodes
+ * that don't have xattr iops. We have xattr iops for the acls, so we must
+ * also implement the security.* defaults here.
+ */
+static size_t shmem_xattr_security_list(struct inode *inode, char *list,
+ size_t list_len, const char *name,
+ size_t name_len)
+{
+ return security_inode_listsecurity(inode, list, list_len);
+}
+
+static int shmem_xattr_security_get(struct inode *inode, const char *name,
+ void *buffer, size_t size)
+{
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+ return security_inode_getsecurity(inode, name, buffer, size,
+ -EOPNOTSUPP);
+}
+
+static int shmem_xattr_security_set(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
+{
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+ return security_inode_setsecurity(inode, name, value, size, flags);
+}
+
+struct xattr_handler shmem_xattr_security_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .list = shmem_xattr_security_list,
+ .get = shmem_xattr_security_get,
+ .set = shmem_xattr_security_set,
+};
+
+static struct xattr_handler *shmem_xattr_handlers[] = {
+ &shmem_xattr_acl_access_handler,
+ &shmem_xattr_acl_default_handler,
+ &shmem_xattr_security_handler,
+ NULL
+};
+#endif
+
static int shmem_parse_options(char *options, int *mode, uid_t *uid, gid_t *gid, unsigned long *blocks, unsigned long *inodes)
{
char *this_char, *value, *rest;
@@ -2010,6 +2063,10 @@ static int shmem_fill_super(struct super
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = TMPFS_MAGIC;
sb->s_op = &shmem_ops;
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ sb->s_xattr = shmem_xattr_handlers;
+ sb->s_flags |= MS_POSIXACL;
+#endif

inode = shmem_get_inode(sb, S_IFDIR | mode, 0);
if (!inode)
@@ -2046,6 +2103,7 @@ static void shmem_destroy_inode(struct i
/* only struct inode is valid if it's an inline symlink */
mpol_free_shared_policy(&SHMEM_I(inode)->policy);
}
+ shmem_acl_destroy_inode(inode);
kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode));
}

@@ -2056,6 +2114,10 @@ static void init_once(void *foo, kmem_ca
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR) {
inode_init_once(&p->vfs_inode);
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ p->i_acl = NULL;
+ p->i_default_acl = NULL;
+#endif
}
}

@@ -2099,6 +2161,13 @@ static struct inode_operations shmem_ino
.truncate = shmem_truncate,
.setattr = shmem_notify_change,
.truncate_range = shmem_truncate_range,
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
+ .listxattr = generic_listxattr,
+ .removexattr = generic_removexattr,
+ .permission = shmem_permission,
+#endif
};

static struct inode_operations shmem_dir_inode_operations = {
@@ -2113,6 +2182,25 @@ static struct inode_operations shmem_dir
.mknod = shmem_mknod,
.rename = shmem_rename,
#endif
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ .setattr = shmem_notify_change,
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
+ .listxattr = generic_listxattr,
+ .removexattr = generic_removexattr,
+ .permission = shmem_permission,
+#endif
+};
+
+static struct inode_operations shmem_special_inode_operations = {
+#ifdef CONFIG_TMPFS_POSIX_ACL
+ .setattr = shmem_notify_change,
+ .setxattr = generic_setxattr,
+ .getxattr = generic_getxattr,
+ .listxattr = generic_listxattr,
+ .removexattr = generic_removexattr,
+ .permission = shmem_permission,
+#endif
};

static struct super_operations shmem_ops = {
Index: linux-2.6.15-git4/mm/shmem_acl.c
===================================================================
--- /dev/null
+++ linux-2.6.15-git4/mm/shmem_acl.c
@@ -0,0 +1,157 @@
+/*
+ * mm/shmem_acl.c
+ *
+ * (C) 2006 Andreas Gruenbacher <agruen@suse.de>
+ *
+ * This file is released under the GPL.
+ */
+
+#include <linux/fs.h>
+#include <linux/shmem_fs.h>
+#include <linux/xattr.h>
+#include <linux/generic_acl.h>
+
+static struct posix_acl *
+shmem_get_acl(struct inode *inode, int type)
+{
+ struct posix_acl *acl = NULL;
+
+ spin_lock(&inode->i_lock);
+ switch(type) {
+ case ACL_TYPE_ACCESS:
+ acl = posix_acl_dup(SHMEM_I(inode)->i_acl);
+ break;
+
+ case ACL_TYPE_DEFAULT:
+ acl = posix_acl_dup(SHMEM_I(inode)->i_default_acl);
+ break;
+ }
+ spin_unlock(&inode->i_lock);
+
+ return acl;
+}
+
+static void
+shmem_set_acl(struct inode *inode, int type, struct posix_acl *acl)
+{
+ spin_lock(&inode->i_lock);
+ switch(type) {
+ case ACL_TYPE_ACCESS:
+ if (SHMEM_I(inode)->i_acl)
+ posix_acl_release(SHMEM_I(inode)->i_acl);
+ SHMEM_I(inode)->i_acl = posix_acl_dup(acl);
+ break;
+
+ case ACL_TYPE_DEFAULT:
+ if (SHMEM_I(inode)->i_default_acl)
+ posix_acl_release(SHMEM_I(inode)->i_default_acl);
+ SHMEM_I(inode)->i_default_acl = posix_acl_dup(acl);
+ break;
+ }
+ spin_unlock(&inode->i_lock);
+}
+
+struct generic_acl_operations shmem_acl_ops = {
+ .getacl = shmem_get_acl,
+ .setacl = shmem_set_acl,
+};
+
+static size_t
+shmem_list_acl_access(struct inode *inode, char *list, size_t list_size,
+ const char *name, size_t name_len)
+{
+ return generic_acl_list(inode, &shmem_acl_ops, ACL_TYPE_ACCESS,
+ list, list_size);
+}
+
+static size_t
+shmem_list_acl_default(struct inode *inode, char *list, size_t list_size,
+ const char *name, size_t name_len)
+{
+ return generic_acl_list(inode, &shmem_acl_ops, ACL_TYPE_DEFAULT,
+ list, list_size);
+}
+
+static int
+shmem_get_acl_access(struct inode *inode, const char *name, void *buffer,
+ size_t size)
+{
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ return generic_acl_get(inode, &shmem_acl_ops, ACL_TYPE_ACCESS, buffer,
+ size);
+}
+
+static int
+shmem_get_acl_default(struct inode *inode, const char *name, void *buffer,
+ size_t size)
+{
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ return generic_acl_get(inode, &shmem_acl_ops, ACL_TYPE_DEFAULT, buffer,
+ size);
+}
+
+static int
+shmem_set_acl_access(struct inode *inode, const char *name, const void *value,
+ size_t size, int flags)
+{
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ return generic_acl_set(inode, &shmem_acl_ops, ACL_TYPE_ACCESS, value,
+ size);
+}
+
+static int
+shmem_set_acl_default(struct inode *inode, const char *name, const void *value,
+ size_t size, int flags)
+{
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ return generic_acl_set(inode, &shmem_acl_ops, ACL_TYPE_DEFAULT, value,
+ size);
+}
+
+struct xattr_handler shmem_xattr_acl_access_handler = {
+ .prefix = POSIX_ACL_XATTR_ACCESS,
+ .list = shmem_list_acl_access,
+ .get = shmem_get_acl_access,
+ .set = shmem_set_acl_access,
+};
+
+struct xattr_handler shmem_xattr_acl_default_handler = {
+ .prefix = POSIX_ACL_XATTR_DEFAULT,
+ .list = shmem_list_acl_default,
+ .get = shmem_get_acl_default,
+ .set = shmem_set_acl_default,
+};
+
+void
+shmem_acl_destroy_inode(struct inode *inode)
+{
+ if (SHMEM_I(inode)->i_acl)
+ posix_acl_release(SHMEM_I(inode)->i_acl);
+ SHMEM_I(inode)->i_acl = NULL;
+ if (SHMEM_I(inode)->i_default_acl)
+ posix_acl_release(SHMEM_I(inode)->i_default_acl);
+ SHMEM_I(inode)->i_default_acl = NULL;
+}
+
+static int
+shmem_check_acl(struct inode *inode, int mask)
+{
+ struct posix_acl *acl = shmem_get_acl(inode, ACL_TYPE_ACCESS);
+
+ if (acl) {
+ int error = posix_acl_permission(inode, acl, mask);
+ posix_acl_release(acl);
+ return error;
+ }
+ return -EAGAIN;
+}
+
+int
+shmem_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ return generic_permission(inode, mask, shmem_check_acl);
+}
--
Andreas Gruenbacher <agruen@suse.de>
SUSE Labs, SUSE LINUX Products GmbH / Novell Inc.

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