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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: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Link: https://lore.kernel.org/r/245727.1567183359@turing-police
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Valdis Klētnieks 2019-08-30 12:42:39 -04:00 committed by Greg Kroah-Hartman
parent 097a802ae1
commit 58985a9d2d
2 changed files with 14 additions and 0 deletions
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8
drivers/staging/exfat/Kconfig
View File

@ -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

6
drivers/staging/exfat/exfat_super.c
View File

@ -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);
}