Miklos Szeredi 9b91b6b019 ovl: fix deadlock in splice write ... There's possibility of an ABBA deadlock in case of a splice write to an overlayfs file and a concurrent splice write to a corresponding real file. The call chain for splice to an overlay file: -> do_splice [takes sb_writers on overlay file] -> do_splice_from -> iter_file_splice_write [takes pipe->mutex] -> vfs_iter_write ... -> ovl_write_iter [takes sb_writers on real file] And the call chain for splice to a real file: -> do_splice [takes sb_writers on real file] -> do_splice_from -> iter_file_splice_write [takes pipe->mutex] Syzbot successfully bisected this to commit 82a763e61e ("ovl: simplify file splice"). Fix by reverting the write part of the above commit and by adding missing bits from ovl_write_iter() into ovl_splice_write(). Fixes: 82a763e61e ("ovl: simplify file splice") Reported-and-tested-by: syzbot+579885d1a9a833336209@syzkaller.appspotmail.com Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>		2021-08-10 10:21:30 +02:00
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copy_up.c	ovl: fix missing revert_creds() on error path	2021-04-12 12:00:36 +02:00
dir.c	ovl: stack fileattr ops	2021-04-12 15:04:29 +02:00
export.c	ovl: propagate ovl_fs to ovl_decode_real_fh and ovl_encode_real_fh	2020-11-12 11:31:55 +01:00
file.c	ovl: fix deadlock in splice write	2021-08-10 10:21:30 +02:00
inode.c	overlayfs update for 5.13	2021-04-30 15:17:08 -07:00
Kconfig	docs: fix broken references to text files	2020-04-20 15:35:59 -06:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
namei.c	overlayfs update for 5.13	2021-04-30 15:17:08 -07:00
overlayfs.h	overlayfs update for 5.13	2021-04-30 15:17:08 -07:00
ovl_entry.h	ovl: implement volatile-specific fsync error behaviour	2021-01-28 10:22:48 +01:00
readdir.c	ovl: skip stale entries in merge dir cache iteration	2021-08-10 10:21:30 +02:00
super.c	ovl: allow upperdir inside lowerdir	2021-04-12 12:00:37 +02:00
util.c	ovl: invalidate readdir cache on changes to dir with origin	2021-04-12 12:00:37 +02:00