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| author | Valdis Klētnieks <valdis.kletnieks@vt.edu> | 2019-08-30 12:42:39 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-02 10:44:13 +0200 |
| commit | 58985a9d2d03e977db93bf574a16162766a318fe (patch) | |
| tree | ebc61791f5a32c6ca06413bf634df1e981629f01 /drivers | |
| parent | 097a802ae15e2c6d17256a6fe0712a655ba10823 (diff) | |
| download | linux-58985a9d2d03e977db93bf574a16162766a318fe.tar.bz2 | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/exfat/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/staging/exfat/exfat_super.c | 6 |
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/staging/exfat/Kconfig b/drivers/staging/exfat/Kconfig index 78b32aa2ca19..f52129c67f97 100644 --- a/drivers/staging/exfat/Kconfig +++ b/drivers/staging/exfat/Kconfig @@ -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 diff --git a/drivers/staging/exfat/exfat_super.c b/drivers/staging/exfat/exfat_super.c index 5b5c2ca8c9aa..d9787635a373 100644 --- a/drivers/staging/exfat/exfat_super.c +++ b/drivers/staging/exfat/exfat_super.c @@ -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); } |