Commit c8a139d0 authored by NeilBrown's avatar NeilBrown Committed by Greg Kroah-Hartman

sysfs: be careful of error returns from ops->show()

ops->show() can return a negative error code.
Commit 65da3484 ("sysfs: correctly handle short reads on PREALLOC attrs.")
(in v4.4) caused this to be stored in an unsigned 'size_t' variable, so errors
would look like large numbers.
As a result, if an error is returned, sysfs_kf_read() will return the
value of 'count', typically 4096.

Commit 17d0774f ("sysfs: correctly handle read offset on PREALLOC attrs")
(in v4.8) extended this error to use the unsigned large 'len' as a size for
Consequently, if ->show returns an error, then the first read() on the
sysfs file will return 4096 and could return uninitialized memory to
If the application performs a subsequent read, this will trigger a memmove()
with extremely large count, and is likely to crash the machine is bizarre ways.

This bug can currently only be triggered by reading from an md
sysfs attribute declared with __ATTR_PREALLOC() during the
brief period between when mddev_put() deletes an mddev from
the ->all_mddevs list, and when mddev_delayed_delete() - which is
scheduled on a workqueue - completes.
Before this, an error won't be returned by the ->show()
After this, the ->show() won't be called.

I can reproduce it reliably only by putting delay like
early in mddev_delayed_delete(). Then after creating an
md device md0 run
  echo clear > /sys/block/md0/md/array_state; cat /sys/block/md0/md/array_state

The bug can be triggered without the usleep.

Fixes: 65da3484 ("sysfs: correctly handle short reads on PREALLOC attrs.")
Fixes: 17d0774f ("sysfs: correctly handle read offset on PREALLOC attrs")
Signed-off-by: default avatarNeilBrown <>
Acked-by: default avatarTejun Heo <>
Reported-and-tested-by: default avatarMiroslav Benes <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent cf903e9d
......@@ -108,7 +108,7 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
const struct sysfs_ops *ops = sysfs_file_ops(of->kn);
struct kobject *kobj = of->kn->parent->priv;
size_t len;
ssize_t len;
* If buf != of->prealloc_buf, we don't know how
......@@ -117,13 +117,15 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
if (WARN_ON_ONCE(buf != of->prealloc_buf))
return 0;
len = ops->show(kobj, of->kn->priv, buf);
if (len < 0)
return len;
if (pos) {
if (len <= pos)
return 0;
len -= pos;
memmove(buf, buf + pos, len);
return min(count, len);
return min_t(ssize_t, count, len);
/* kernfs write callback for regular sysfs files */
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