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Filename Latest commit message Latest commit date
Yuezhang Mo 118b6d539d exfat: fix reporting fs error when reading dir beyond EOF 
Since seekdir() does not check whether the position is valid, the
position may exceed the size of the directory. We found that for
a directory with discontinuous clusters, if the position exceeds
the size of the directory and the excess size is greater than or
equal to the cluster size, exfat_readdir() will return -EIO,
causing a file system error and making the file system unavailable.

Reproduce this bug by:

seekdir(dir, dir_size + cluster_size);
dirent = readdir(dir);

The following log will be printed if mount with 'errors=remount-ro'.

[11166.712896] exFAT-fs (sdb1): error, invalid access to FAT (entry 0xffffffff)
[11166.712905] exFAT-fs (sdb1): Filesystem has been set read-only

Fixes: 1e5654de0f51 ("exfat: handle wrong stream entry size in exfat_readdir()")
Cc: stable@vger.kernel.org # v5.7+
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reviewed-by: Andy Wu <Andy.Wu@sony.com>
Reviewed-by: Aoyama Wataru <wataru.aoyama@sony.com>
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
2022-12-30 10:44:41 +09:00
.github/workflows exfat: remove generic/286 2022-12-09 23:20:49 +09:00
balloc.c
cache.c
dir.c exfat: fix reporting fs error when reading dir beyond EOF 2022-12-30 10:44:41 +09:00
exfat_fs.h exfat: fix overflow in sector and cluster conversion 2022-12-15 08:29:29 +09:00
exfat_raw.h
fatent.c exfat: fix overflow for large capacity partition 2022-08-24 08:21:31 +09:00
file.c exfat: remove i_size_write() from __exfat_truncate() 2022-12-15 08:29:26 +09:00
inode.c exfat: remove i_size_write() from __exfat_truncate() 2022-12-15 08:29:26 +09:00
Kconfig
Makefile
misc.c exfat: Expand exfat_err() and co directly to pr_*() macro 2022-07-29 17:26:04 +09:00
namei.c exfat: remove unnecessary arguments from exfat_find_dir_entry() 2022-12-15 08:29:19 +09:00
nls.c exfat: Drop superfluous new line for error messages 2022-07-29 17:26:12 +09:00
README.md
super.c exfat: Drop superfluous new line for error messages 2022-07-29 17:26:12 +09:00

README.md

exFAT filesystem

This is the exfat filesystem for support from the linux 4.1 kernel to the latest kernel.

Installing as a stand-alone module

Install prerequisite package for Fedora, RHEL:

	yum install kernel-devel-$(uname -r)

Build step:

	make
	sudo make install

To load the driver manually, run this as root:

	modprobe exfat

Installing as a part of the kernel

  1. Let's take [linux] as the path to your kernel source dir.
	cd [linux]
	cp -ar exfat [linux]/fs/
  1. edit [linux]/fs/Kconfig
	source "fs/fat/Kconfig"
	+source "fs/exfat/Kconfig"
	source "fs/ntfs/Kconfig"
  1. edit [linux]/fs/Makefile
	obj-$(CONFIG_FAT_FS)          += fat/
	+obj-$(CONFIG_EXFAT_FS)       += exfat/
	obj-$(CONFIG_BFS_FS)          += bfs/
  1. make menuconfig and set exfat
	File systems  --->
		DOS/FAT/NT Filesystems  --->
			<M> exFAT filesystem support
			(utf8) Default iocharset for exFAT

build your kernel