Amir Goldstein 01b39dcc95 ovl: use inode_insert5() to hash a newly created inode ... Currently, there is a small window where ovl_obtain_alias() can race with ovl_instantiate() and create two different overlay inodes with the same underlying real non-dir non-hardlink inode. The race requires an adversary to guess the file handle of the yet to be created upper inode and decode the guessed file handle after ovl_creat_real(), but before ovl_instantiate(). This race does not affect overlay directory inodes, because those are decoded via ovl_lookup_real() and not with ovl_obtain_alias(). This patch fixes the race, by using inode_insert5() to add a newly created inode to cache. If the newly created inode apears to already exist in cache (hashed by the same real upper inode), we instantiate the dentry with the old inode and drop the new inode, instead of silently not hashing the new inode. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>		2018-05-31 11:06:12 +02:00
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copy_up.c	ovl: clean up copy-up error paths	2018-05-31 11:06:11 +02:00
dir.c	ovl: use inode_insert5() to hash a newly created inode	2018-05-31 11:06:12 +02:00
export.c	ovl: Pass argument to ovl_get_inode() in a structure	2018-05-31 11:06:12 +02:00
inode.c	ovl: use inode_insert5() to hash a newly created inode	2018-05-31 11:06:12 +02:00
Kconfig	ovl: Kconfig documentation fixes	2018-05-31 11:06:10 +02:00
Makefile	ovl: encode pure upper file handles	2018-01-24 11:25:59 +01:00
namei.c	ovl: Pass argument to ovl_get_inode() in a structure	2018-05-31 11:06:12 +02:00
overlayfs.h	ovl: use inode_insert5() to hash a newly created inode	2018-05-31 11:06:12 +02:00
ovl_entry.h	ovl: add support for "xino" mount and config options	2018-04-12 12:04:50 +02:00
readdir.c	ovl: consistent d_ino for non-samefs with xino	2018-04-12 12:04:50 +02:00
super.c	ovl: return dentry from ovl_create_real()	2018-05-31 11:06:11 +02:00
util.c	ovl: constant st_ino for non-samefs with xino	2018-04-12 12:04:50 +02:00