The patch titled
sysfs: don't block indefinitely for unmapped files.
has been added to the -mm tree. Its filename is
sysfs-dont-block-indefinitely-for-unmapped-files.patch
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------------------------------------------------------
Subject: sysfs: don't block indefinitely for unmapped files.
From: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxx>
Modify sysfs bin files so that we can remove the bin file while they are
still mapped. When the kobject is removed we unmap the bin file and
arrange for future accesses to the mapping to receive SIGBUS.
Implementing this prevents a nasty DOS when pci devices are hot plugged
and unplugged. Where if any of their resources were mmaped the kernel
could not free up their pci resources or release their pci data
structures.
Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxx>
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Cc: Kay Sievers <kay.sievers@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/sysfs/bin.c | 183 ++++++++++++++++++++++++++++++++++++++++++---
fs/sysfs/dir.c | 1
fs/sysfs/sysfs.h | 2
3 files changed, 174 insertions(+), 12 deletions(-)
diff -puN fs/sysfs/bin.c~sysfs-dont-block-indefinitely-for-unmapped-files fs/sysfs/bin.c
--- a/fs/sysfs/bin.c~sysfs-dont-block-indefinitely-for-unmapped-files
+++ a/fs/sysfs/bin.c
@@ -21,15 +21,28 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mutex.h>
+#include <linux/mm.h>
#include <asm/uaccess.h>
#include "sysfs.h"
+/*
+ * There's one bin_buffer for each open file.
+ *
+ * filp->private_data points to bin_buffer and
+ * sysfs_dirent->s_bin_attr.buffers points to a the bin_buffer s
+ * sysfs_dirent->s_bin_attr.buffers is protected by sysfs_bin_lock
+ */
+static DEFINE_MUTEX(sysfs_bin_lock);
+
struct bin_buffer {
- struct mutex mutex;
- void *buffer;
- int mmapped;
+ struct mutex mutex;
+ void *buffer;
+ int mmapped;
+ struct vm_operations_struct *vm_ops;
+ struct file *file;
+ struct hlist_node list;
};
static int
@@ -168,29 +181,148 @@ out_free:
return count;
}
+static void bin_vma_open(struct vm_area_struct *vma)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+
+ if (!bb->vm_ops || !bb->vm_ops->open)
+ return;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return;
+
+ bb->vm_ops->open(vma);
+
+ sysfs_put_active_two(attr_sd);
+}
+
+static void bin_vma_close(struct vm_area_struct *vma)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+
+ if (!bb->vm_ops || !bb->vm_ops->close)
+ return;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return;
+
+ bb->vm_ops->close(vma);
+
+ sysfs_put_active_two(attr_sd);
+}
+
+static int bin_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+ int ret;
+
+ if (!bb->vm_ops || !bb->vm_ops->fault)
+ return VM_FAULT_SIGBUS;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return VM_FAULT_SIGBUS;
+
+ ret = bb->vm_ops->fault(vma, vmf);
+
+ sysfs_put_active_two(attr_sd);
+ return ret;
+}
+
+static int bin_page_mkwrite(struct vm_area_struct *vma, struct page *page)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+ int ret;
+
+ if (!bb->vm_ops || !bb->vm_ops->page_mkwrite)
+ return -EINVAL;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return -EINVAL;
+
+ ret = bb->vm_ops->page_mkwrite(vma, page);
+
+ sysfs_put_active_two(attr_sd);
+ return ret;
+}
+
+static int bin_access(struct vm_area_struct *vma, unsigned long addr,
+ void *buf, int len, int write)
+{
+ struct file *file = vma->vm_file;
+ struct bin_buffer *bb = file->private_data;
+ struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
+ int ret;
+
+ if (!bb->vm_ops || !bb->vm_ops->access)
+ return -EINVAL;
+
+ if (!sysfs_get_active_two(attr_sd))
+ return -EINVAL;
+
+ ret = bb->vm_ops->access(vma, addr, buf, len, write);
+
+ sysfs_put_active_two(attr_sd);
+ return ret;
+}
+
+static struct vm_operations_struct bin_vm_ops = {
+ .open = bin_vma_open,
+ .close = bin_vma_close,
+ .fault = bin_fault,
+ .page_mkwrite = bin_page_mkwrite,
+ .access = bin_access,
+};
+
static int mmap(struct file *file, struct vm_area_struct *vma)
{
struct bin_buffer *bb = file->private_data;
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
struct bin_attribute *attr = attr_sd->s_bin_attr.bin_attr;
struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;
+ struct vm_operations_struct *vm_ops;
int rc;
mutex_lock(&bb->mutex);
/* need attr_sd for attr, its parent for kobj */
+ rc = -ENODEV;
if (!sysfs_get_active_two(attr_sd))
- return -ENODEV;
+ goto out_unlock;
rc = -EINVAL;
- if (attr->mmap)
- rc = attr->mmap(kobj, attr, vma);
+ if (!attr->mmap)
+ goto out_put;
- if (rc == 0 && !bb->mmapped)
- bb->mmapped = 1;
- else
- sysfs_put_active_two(attr_sd);
+ rc = attr->mmap(kobj, attr, vma);
+ vm_ops = vma->vm_ops;
+ vma->vm_ops = &bin_vm_ops;
+ if (rc)
+ goto out_put;
+
+ rc = -EINVAL;
+ if (bb->mmapped && bb->vm_ops != vma->vm_ops)
+ goto out_put;
+#ifdef CONFIG_NUMA
+ rc = -EINVAL;
+ if (vm_ops && ((vm_ops->set_policy || vm_ops->get_policy || vm_ops->migrate)))
+ goto out_put;
+#endif
+
+ rc = 0;
+ bb->mmapped = 1;
+ bb->vm_ops = vm_ops;
+out_put:
+ sysfs_put_active_two(attr_sd);
+out_unlock:
mutex_unlock(&bb->mutex);
return rc;
@@ -223,8 +355,13 @@ static int open(struct inode * inode, st
goto err_out;
mutex_init(&bb->mutex);
+ bb->file = file;
file->private_data = bb;
+ mutex_lock(&sysfs_bin_lock);
+ hlist_add_head(&bb->list, &attr_sd->s_bin_attr.buffers);
+ mutex_unlock(&sysfs_bin_lock);
+
/* open succeeded, put active references */
sysfs_put_active_two(attr_sd);
return 0;
@@ -240,8 +377,10 @@ static int release(struct inode * inode,
struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
struct bin_buffer *bb = file->private_data;
- if (bb->mmapped)
- sysfs_put_active_two(attr_sd);
+ mutex_lock(&sysfs_bin_lock);
+ hlist_del(&bb->list);
+ mutex_unlock(&sysfs_bin_lock);
+
kfree(bb->buffer);
kfree(bb);
return 0;
@@ -256,6 +395,26 @@ const struct file_operations bin_fops =
.release = release,
};
+
+void unmap_bin_file(struct sysfs_dirent *attr_sd)
+{
+ struct bin_buffer *bb;
+ struct hlist_node *tmp;
+
+ if (sysfs_type(attr_sd) != SYSFS_KOBJ_BIN_ATTR)
+ return;
+
+ mutex_lock(&sysfs_bin_lock);
+
+ hlist_for_each_entry(bb, tmp, &attr_sd->s_bin_attr.buffers, list) {
+ struct inode *inode = bb->file->f_path.dentry->d_inode;
+
+ unmap_mapping_range(inode->i_mapping, 0, 0, 1);
+ }
+
+ mutex_unlock(&sysfs_bin_lock);
+}
+
/**
* sysfs_create_bin_file - create binary file for object.
* @kobj: object.
diff -puN fs/sysfs/dir.c~sysfs-dont-block-indefinitely-for-unmapped-files fs/sysfs/dir.c
--- a/fs/sysfs/dir.c~sysfs-dont-block-indefinitely-for-unmapped-files
+++ a/fs/sysfs/dir.c
@@ -609,6 +609,7 @@ void sysfs_addrm_finish(struct sysfs_add
sysfs_drop_dentry(sd);
sysfs_deactivate(sd);
+ unmap_bin_file(sd);
sysfs_put(sd);
}
}
diff -puN fs/sysfs/sysfs.h~sysfs-dont-block-indefinitely-for-unmapped-files fs/sysfs/sysfs.h
--- a/fs/sysfs/sysfs.h~sysfs-dont-block-indefinitely-for-unmapped-files
+++ a/fs/sysfs/sysfs.h
@@ -28,6 +28,7 @@ struct sysfs_elem_attr {
struct sysfs_elem_bin_attr {
struct bin_attribute *bin_attr;
+ struct hlist_head buffers;
};
/*
@@ -164,6 +165,7 @@ int sysfs_add_file_mode(struct sysfs_dir
* bin.c
*/
extern const struct file_operations bin_fops;
+void unmap_bin_file(struct sysfs_dirent *attr_sd);
/*
* symlink.c
_
Patches currently in -mm which might be from ebiederm@xxxxxxxxxxxxxxxxxx are
linux-next.patch
sysfs-dont-block-indefinitely-for-unmapped-files.patch
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