Ming Lei bb2b0051d7 sysfs: check if one entry has been removed before freeing ...

It might be a kernel disaster if one sysfs entry is freed but
still referenced by sysfs tree.

Recently Dave and Sasha reported one use-after-free problem on
sysfs entry, and the problem has been troubleshooted with help
of debug message added in this patch.

Given sysfs_get_dirent/sysfs_put are exported APIs, even inside
sysfs they are called in many contexts(kobject/attribe add/delete,
inode init/drop, dentry lookup/release, readdir, ...), it is healthful
to check the removed flag before freeing one entry and dump message
if it is freeing without being removed first.

Cc: Dave Jones <[email protected]>
Cc: Sasha Levin <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

2013-04-05 15:35:52 -07:00

..

bin.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

dir.c

sysfs: check if one entry has been removed before freeing

2013-04-05 15:35:52 -07:00

file.c

Revert "sysfs: Convert print_symbol to %pSR"

2013-01-17 13:09:57 -08:00

group.c

sysfs: Functions for adding/removing symlinks to/from attribute groups

2013-01-25 21:51:13 +01:00

inode.c

Merge tag 'writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux

2012-05-28 09:54:45 -07:00

Kconfig

kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT

2011-01-20 17:02:05 -08:00

Makefile

…

mount.c

userns: Restrict when proc and sysfs can be mounted

2013-03-27 07:50:08 -07:00

symlink.c

sysfs: Functions for adding/removing symlinks to/from attribute groups

2013-01-25 21:51:13 +01:00

sysfs.h

sysfs: Functions for adding/removing symlinks to/from attribute groups

2013-01-25 21:51:13 +01:00