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Commit 58985a9d authored by Valdis Kletnieks's avatar Valdis Kletnieks Committed by Greg Kroah-Hartman
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drivers/staging/exfat - by default, prohibit mount of fat/vfat 



Concerns have been raised about the exfat driver accidentally mounting
fat/vfat file systems.  Add an extra configure option to help prevent that.

Signed-off-by: default avatarValdis Kletnieks <valdis.kletnieks@vt.edu>
Link: https://lore.kernel.org/r/245727.1567183359@turing-police


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 097a802a

drivers/staging/exfat/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -4,6 +4,14 @@ config EXFAT_FS 
	help

	  This adds support for the exFAT file system.



config EXFAT_DONT_MOUNT_VFAT

	bool "Prohibit mounting of fat/vfat filesysems by exFAT"

	default y

	help

	  By default, the exFAT driver will only mount exFAT filesystems, and refuse

	  to mount fat/vfat filesystems.  Set this to 'n' to allow the exFAT driver

	  to mount these filesystems.



config EXFAT_DISCARD

	bool "enable discard support"

	depends on EXFAT_FS

drivers/staging/exfat/exfat_super.c

+6 −0
Original line number Diff line number Diff line
@@ -486,10 +486,16 @@ static int ffsMountVol(struct super_block *sb) 
			break;



	if (i < 53) {

#ifdef CONFIG_EXFAT_DONT_MOUNT_VFAT

		ret = -EINVAL;

		printk(KERN_INFO "EXFAT: Attempted to mount VFAT filesystem\n");

		goto out;

#else

		if (GET16(p_pbr->bpb + 11)) /* num_fat_sectors */

			ret = fat16_mount(sb, p_pbr);

		else

			ret = fat32_mount(sb, p_pbr);

#endif

	} else {

		ret = exfat_mount(sb, p_pbr);

	}