Miklos Szeredi b160dbd123 fuse: fix readdir cache race ... commit 9fa248c65b upstream. There's a race in fuse's readdir cache that can result in an uninitilized page being read. The page lock is supposed to prevent this from happening but in the following case it doesn't: Two fuse_add_dirent_to_cache() start out and get the same parameters (size=0,offset=0). One of them wins the race to create and lock the page, after which it fills in data, sets rdc.size and unlocks the page. In the meantime the page gets evicted from the cache before the other instance gets to run. That one also creates the page, but finds the size to be mismatched, bails out and leaves the uninitialized page in the cache. Fix by marking a filled page uptodate and ignoring non-uptodate pages. Reported-by: Frank Sorenson <fsorenso@redhat.com> Fixes: 5d7bc7e868 ("fuse: allow using readdir cache") Cc: <stable@vger.kernel.org> # v4.20 Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-11-10 18:17:34 +01:00
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acl.c	vfs: add rcu argument to ->get_acl() callback	2021-08-18 22:08:24 +02:00
control.c	fuse: Remove the control interface for virtio-fs	2022-07-21 16:06:19 +02:00
cuse.c	cuse: simplify refcount	2021-04-14 10:40:58 +02:00
dax.c	fuse: avoid unnecessary spinlock bump	2022-07-21 16:02:45 +02:00
dev.c	iov_iter: advancing variants of iov_iter_get_pages{,_alloc}()	2022-08-08 22:37:22 -04:00
dir.c	fuse: Add module param for CAP_SYS_ADMIN access bypassing allow_other	2022-07-21 16:06:19 +02:00
file.c	fuse: add file_modified() to fallocate	2022-11-10 18:17:33 +01:00
fuse_i.h	fs: Remove ->readpages address space operation	2022-04-01 13:45:33 -04:00
inode.c	fuse: retire block-device-based superblock on force unmount	2022-07-27 11:30:31 +02:00
ioctl.c	fuse: ioctl: translate ENOSYS	2022-07-21 16:06:18 +02:00
Kconfig	dax: remove CONFIG_DAX_DRIVER	2021-12-04 08:58:51 -08:00
Makefile	fuse: move ioctl to separate source file	2021-04-12 15:04:30 +02:00
readdir.c	fuse: fix readdir cache race	2022-11-10 18:17:34 +01:00
virtio_fs.c	virtio_fs: Modify format for virtio_fs_direct_access	2022-07-26 10:38:58 +02:00
xattr.c	fuse: move fuse_invalidate_attr() into fuse_update_ctime()	2021-10-22 17:03:01 +02:00