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Date: Fri, 24 Dec 2010 14:48:35 +0000
From: David Howells <dhowells@...hat.com>
To: jmorris@...ei.org, viro@...iv.linux.org.uk,
penguin-kernel@...ove.SAKURA.ne.jp
Cc: tomoyo-users-en@...ts.sourceforge.jp,
linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: [PATCH] CacheFiles: Add calls to path-based security hooks [ver #2]
Add calls to path-based security hooks into CacheFiles as, unlike inode-based
security, these aren't implicit in the vfs_mkdir() and similar calls.
Reported-by: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/cachefiles/namei.c | 52 +++++++++++++++++++++++++++++++++++++++++--------
security/security.c | 3 +++
2 files changed, 47 insertions(+), 8 deletions(-)
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 42c7faf..a0358c2 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -275,6 +275,7 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache,
bool preemptive)
{
struct dentry *grave, *trap;
+ struct path path, path_to_graveyard;
char nbuffer[8 + 8 + 1];
int ret;
@@ -287,10 +288,18 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache,
/* non-directories can just be unlinked */
if (!S_ISDIR(rep->d_inode->i_mode)) {
_debug("unlink stale object");
- ret = vfs_unlink(dir->d_inode, rep);
- if (preemptive)
- cachefiles_mark_object_buried(cache, rep);
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ ret = security_path_unlink(&path, rep);
+ if (ret < 0) {
+ cachefiles_io_error(cache, "Unlink security error");
+ } else {
+ ret = vfs_unlink(dir->d_inode, rep);
+
+ if (preemptive)
+ cachefiles_mark_object_buried(cache, rep);
+ }
mutex_unlock(&dir->d_inode->i_mutex);
@@ -379,12 +388,23 @@ try_again:
}
/* attempt the rename */
- ret = vfs_rename(dir->d_inode, rep, cache->graveyard->d_inode, grave);
- if (ret != 0 && ret != -ENOMEM)
- cachefiles_io_error(cache, "Rename failed with error %d", ret);
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ path_to_graveyard.mnt = cache->mnt;
+ path_to_graveyard.dentry = cache->graveyard;
+ ret = security_path_rename(&path, rep, &path_to_graveyard, grave);
+ if (ret < 0) {
+ cachefiles_io_error(cache, "Rename security error %d", ret);
+ } else {
+ ret = vfs_rename(dir->d_inode, rep,
+ cache->graveyard->d_inode, grave);
+ if (ret != 0 && ret != -ENOMEM)
+ cachefiles_io_error(cache,
+ "Rename failed with error %d", ret);
- if (preemptive)
- cachefiles_mark_object_buried(cache, rep);
+ if (preemptive)
+ cachefiles_mark_object_buried(cache, rep);
+ }
unlock_rename(cache->graveyard, dir);
dput(grave);
@@ -448,6 +468,7 @@ int cachefiles_walk_to_object(struct cachefiles_object *parent,
{
struct cachefiles_cache *cache;
struct dentry *dir, *next = NULL;
+ struct path path;
unsigned long start;
const char *name;
int ret, nlen;
@@ -458,6 +479,7 @@ int cachefiles_walk_to_object(struct cachefiles_object *parent,
cache = container_of(parent->fscache.cache,
struct cachefiles_cache, cache);
+ path.mnt = cache->mnt;
ASSERT(parent->dentry);
ASSERT(parent->dentry->d_inode);
@@ -511,6 +533,10 @@ lookup_again:
if (ret < 0)
goto create_error;
+ path.dentry = dir;
+ ret = security_path_mkdir(&path, next, 0);
+ if (ret < 0)
+ goto create_error;
start = jiffies;
ret = vfs_mkdir(dir->d_inode, next, 0);
cachefiles_hist(cachefiles_mkdir_histogram, start);
@@ -536,6 +562,10 @@ lookup_again:
if (ret < 0)
goto create_error;
+ path.dentry = dir;
+ ret = security_path_mknod(&path, next, S_IFREG, 0);
+ if (ret < 0)
+ goto create_error;
start = jiffies;
ret = vfs_create(dir->d_inode, next, S_IFREG, NULL);
cachefiles_hist(cachefiles_create_histogram, start);
@@ -692,6 +722,7 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
{
struct dentry *subdir;
unsigned long start;
+ struct path path;
int ret;
_enter(",,%s", dirname);
@@ -719,6 +750,11 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
_debug("attempt mkdir");
+ path.mnt = cache->mnt;
+ path.dentry = dir;
+ ret = security_path_mkdir(&path, subdir, 0700);
+ if (ret < 0)
+ goto mkdir_error;
ret = vfs_mkdir(dir->d_inode, subdir, 0700);
if (ret < 0)
goto mkdir_error;
diff --git a/security/security.c b/security/security.c
index 1b798d3..568b98d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -360,6 +360,7 @@ int security_path_mkdir(struct path *dir, struct dentry *dentry, int mode)
return 0;
return security_ops->path_mkdir(dir, dentry, mode);
}
+EXPORT_SYMBOL(security_path_mkdir);
int security_path_rmdir(struct path *dir, struct dentry *dentry)
{
@@ -374,6 +375,7 @@ int security_path_unlink(struct path *dir, struct dentry *dentry)
return 0;
return security_ops->path_unlink(dir, dentry);
}
+EXPORT_SYMBOL(security_path_unlink);
int security_path_symlink(struct path *dir, struct dentry *dentry,
const char *old_name)
@@ -400,6 +402,7 @@ int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
return security_ops->path_rename(old_dir, old_dentry, new_dir,
new_dentry);
}
+EXPORT_SYMBOL(security_path_rename);
int security_path_truncate(struct path *path)
{
--
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