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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /fs/xattr.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'fs/xattr.c')
-rw-r--r--fs/xattr.c212
1 files changed, 100 insertions, 112 deletions
diff --git a/fs/xattr.c b/fs/xattr.c
index 0c317c4fd..4861322e2 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -129,7 +129,7 @@ vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
if (error)
return error;
- mutex_lock(&inode->i_mutex);
+ inode_lock(inode);
error = security_inode_setxattr(dentry, name, value, size, flags);
if (error)
goto out;
@@ -137,7 +137,7 @@ vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
error = __vfs_setxattr_noperm(dentry, name, value, size, flags);
out:
- mutex_unlock(&inode->i_mutex);
+ inode_unlock(inode);
return error;
}
EXPORT_SYMBOL_GPL(vfs_setxattr);
@@ -207,26 +207,6 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value,
*xattr_value = value;
return error;
}
-EXPORT_SYMBOL_GPL(vfs_getxattr_alloc);
-
-/* Compare an extended attribute value with the given value */
-int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
- const char *value, size_t size, gfp_t flags)
-{
- char *xattr_value = NULL;
- int rc;
-
- rc = vfs_getxattr_alloc(dentry, xattr_name, &xattr_value, 0, flags);
- if (rc < 0)
- return rc;
-
- if ((rc != size) || (memcmp(xattr_value, value, rc) != 0))
- rc = -EINVAL;
- else
- rc = 0;
- kfree(xattr_value);
- return rc;
-}
ssize_t
vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
@@ -297,7 +277,7 @@ vfs_removexattr(struct dentry *dentry, const char *name)
if (error)
return error;
- mutex_lock(&inode->i_mutex);
+ inode_lock(inode);
error = security_inode_removexattr(dentry, name);
if (error)
goto out;
@@ -310,7 +290,7 @@ vfs_removexattr(struct dentry *dentry, const char *name)
}
out:
- mutex_unlock(&inode->i_mutex);
+ inode_unlock(inode);
return error;
}
EXPORT_SYMBOL_GPL(vfs_removexattr);
@@ -325,7 +305,6 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
{
int error;
void *kvalue = NULL;
- void *vvalue = NULL; /* If non-NULL, we used vmalloc() */
char kname[XATTR_NAME_MAX + 1];
if (flags & ~(XATTR_CREATE|XATTR_REPLACE))
@@ -342,10 +321,9 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
return -E2BIG;
kvalue = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
if (!kvalue) {
- vvalue = vmalloc(size);
- if (!vvalue)
+ kvalue = vmalloc(size);
+ if (!kvalue)
return -ENOMEM;
- kvalue = vvalue;
}
if (copy_from_user(kvalue, value, size)) {
error = -EFAULT;
@@ -358,10 +336,8 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
error = vfs_setxattr(d, kname, kvalue, size, flags);
out:
- if (vvalue)
- vfree(vvalue);
- else
- kfree(kvalue);
+ kvfree(kvalue);
+
return error;
}
@@ -429,7 +405,6 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
{
ssize_t error;
void *kvalue = NULL;
- void *vvalue = NULL;
char kname[XATTR_NAME_MAX + 1];
error = strncpy_from_user(kname, name, sizeof(kname));
@@ -443,10 +418,9 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
size = XATTR_SIZE_MAX;
kvalue = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
if (!kvalue) {
- vvalue = vmalloc(size);
- if (!vvalue)
+ kvalue = vmalloc(size);
+ if (!kvalue)
return -ENOMEM;
- kvalue = vvalue;
}
}
@@ -462,10 +436,9 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
than XATTR_SIZE_MAX bytes. Not possible. */
error = -E2BIG;
}
- if (vvalue)
- vfree(vvalue);
- else
- kfree(kvalue);
+
+ kvfree(kvalue);
+
return error;
}
@@ -522,17 +495,15 @@ listxattr(struct dentry *d, char __user *list, size_t size)
{
ssize_t error;
char *klist = NULL;
- char *vlist = NULL; /* If non-NULL, we used vmalloc() */
if (size) {
if (size > XATTR_LIST_MAX)
size = XATTR_LIST_MAX;
klist = kmalloc(size, __GFP_NOWARN | GFP_KERNEL);
if (!klist) {
- vlist = vmalloc(size);
- if (!vlist)
+ klist = vmalloc(size);
+ if (!klist)
return -ENOMEM;
- klist = vlist;
}
}
@@ -545,10 +516,9 @@ listxattr(struct dentry *d, char __user *list, size_t size)
than XATTR_LIST_MAX bytes. Not possible. */
error = -E2BIG;
}
- if (vlist)
- vfree(vlist);
- else
- kfree(klist);
+
+ kvfree(klist);
+
return error;
}
@@ -701,13 +671,20 @@ xattr_resolve_name(const struct xattr_handler **handlers, const char **name)
return NULL;
for_each_xattr_handler(handlers, handler) {
- const char *n = strcmp_prefix(*name, handler->prefix);
+ const char *n;
+
+ n = strcmp_prefix(*name, xattr_prefix(handler));
if (n) {
+ if (!handler->prefix ^ !*n) {
+ if (*n)
+ continue;
+ return ERR_PTR(-EINVAL);
+ }
*name = n;
- break;
+ return handler;
}
}
- return handler;
+ return ERR_PTR(-EOPNOTSUPP);
}
/*
@@ -719,8 +696,8 @@ generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t s
const struct xattr_handler *handler;
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
- if (!handler)
- return -EOPNOTSUPP;
+ if (IS_ERR(handler))
+ return PTR_ERR(handler);
return handler->get(handler, dentry, name, buffer, size);
}
@@ -736,19 +713,25 @@ generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
if (!buffer) {
for_each_xattr_handler(handlers, handler) {
- size += handler->list(handler, dentry, NULL, 0,
- NULL, 0);
+ if (!handler->name ||
+ (handler->list && !handler->list(dentry)))
+ continue;
+ size += strlen(handler->name) + 1;
}
} else {
char *buf = buffer;
+ size_t len;
for_each_xattr_handler(handlers, handler) {
- size = handler->list(handler, dentry, buf, buffer_size,
- NULL, 0);
- if (size > buffer_size)
+ if (!handler->name ||
+ (handler->list && !handler->list(dentry)))
+ continue;
+ len = strlen(handler->name);
+ if (len + 1 > buffer_size)
return -ERANGE;
- buf += size;
- buffer_size -= size;
+ memcpy(buf, handler->name, len + 1);
+ buf += len + 1;
+ buffer_size -= len + 1;
}
size = buf - buffer;
}
@@ -766,8 +749,8 @@ generic_setxattr(struct dentry *dentry, const char *name, const void *value, siz
if (size == 0)
value = ""; /* empty EA, do not remove */
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
- if (!handler)
- return -EOPNOTSUPP;
+ if (IS_ERR(handler))
+ return PTR_ERR(handler);
return handler->set(handler, dentry, name, value, size, flags);
}
@@ -781,8 +764,8 @@ generic_removexattr(struct dentry *dentry, const char *name)
const struct xattr_handler *handler;
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
- if (!handler)
- return -EOPNOTSUPP;
+ if (IS_ERR(handler))
+ return PTR_ERR(handler);
return handler->set(handler, dentry, name, NULL, 0, XATTR_REPLACE);
}
@@ -809,7 +792,7 @@ EXPORT_SYMBOL(generic_removexattr);
const char *xattr_full_name(const struct xattr_handler *handler,
const char *name)
{
- size_t prefix_len = strlen(handler->prefix);
+ size_t prefix_len = strlen(xattr_prefix(handler));
return name - prefix_len;
}
@@ -864,8 +847,22 @@ int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
return ret;
}
-static int __simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
- const void *value, size_t size, int flags)
+/**
+ * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems
+ * @xattrs: target simple_xattr list
+ * @name: name of the extended attribute
+ * @value: value of the xattr. If %NULL, will remove the attribute.
+ * @size: size of the new xattr
+ * @flags: %XATTR_{CREATE|REPLACE}
+ *
+ * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails
+ * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist;
+ * otherwise, fails with -ENODATA.
+ *
+ * Returns 0 on success, -errno on failure.
+ */
+int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
+ const void *value, size_t size, int flags)
{
struct simple_xattr *xattr;
struct simple_xattr *new_xattr = NULL;
@@ -915,73 +912,64 @@ out:
}
-/**
- * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems
- * @xattrs: target simple_xattr list
- * @name: name of the new extended attribute
- * @value: value of the new xattr. If %NULL, will remove the attribute
- * @size: size of the new xattr
- * @flags: %XATTR_{CREATE|REPLACE}
- *
- * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails
- * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist;
- * otherwise, fails with -ENODATA.
- *
- * Returns 0 on success, -errno on failure.
- */
-int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
- const void *value, size_t size, int flags)
-{
- if (size == 0)
- value = ""; /* empty EA, do not remove */
- return __simple_xattr_set(xattrs, name, value, size, flags);
-}
-
-/*
- * xattr REMOVE operation for in-memory/pseudo filesystems
- */
-int simple_xattr_remove(struct simple_xattrs *xattrs, const char *name)
+static bool xattr_is_trusted(const char *name)
{
- return __simple_xattr_set(xattrs, name, NULL, 0, XATTR_REPLACE);
+ return !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN);
}
-static bool xattr_is_trusted(const char *name)
+static int xattr_list_one(char **buffer, ssize_t *remaining_size,
+ const char *name)
{
- return !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN);
+ size_t len = strlen(name) + 1;
+ if (*buffer) {
+ if (*remaining_size < len)
+ return -ERANGE;
+ memcpy(*buffer, name, len);
+ *buffer += len;
+ }
+ *remaining_size -= len;
+ return 0;
}
/*
* xattr LIST operation for in-memory/pseudo filesystems
*/
-ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer,
- size_t size)
+ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs,
+ char *buffer, size_t size)
{
bool trusted = capable(CAP_SYS_ADMIN);
struct simple_xattr *xattr;
- size_t used = 0;
+ ssize_t remaining_size = size;
+ int err = 0;
+
+#ifdef CONFIG_FS_POSIX_ACL
+ if (inode->i_acl) {
+ err = xattr_list_one(&buffer, &remaining_size,
+ XATTR_NAME_POSIX_ACL_ACCESS);
+ if (err)
+ return err;
+ }
+ if (inode->i_default_acl) {
+ err = xattr_list_one(&buffer, &remaining_size,
+ XATTR_NAME_POSIX_ACL_DEFAULT);
+ if (err)
+ return err;
+ }
+#endif
spin_lock(&xattrs->lock);
list_for_each_entry(xattr, &xattrs->head, list) {
- size_t len;
-
/* skip "trusted." attributes for unprivileged callers */
if (!trusted && xattr_is_trusted(xattr->name))
continue;
- len = strlen(xattr->name) + 1;
- used += len;
- if (buffer) {
- if (size < used) {
- used = -ERANGE;
- break;
- }
- memcpy(buffer, xattr->name, len);
- buffer += len;
- }
+ err = xattr_list_one(&buffer, &remaining_size, xattr->name);
+ if (err)
+ break;
}
spin_unlock(&xattrs->lock);
- return used;
+ return err ? err : size - remaining_size;
}
/*