Package: dosfstools Version: 4.2-1.2 Severity: normal File: /usr/sbin/fsck.fat Tags: upstream X-Debbugs-Cc: [email protected]
Dear Maintainer, fsck.fat can't recover the boot sector from backup boot sectors. If the number of reserved sectors is > 1, a backup boot sector could exist between the boot sector and the first FAT sector. However you don't know the number of reserved sectors yet. This problem has a simple solution. In the worst case of 32K logical sector size, the backup boot sector will still be within the first 129 512 byte sectors. I have prepared a test full disk image. https://github.com/joshudson/dossuperfloppy/raw/refs/heads/master/scantests/recoverbootsect.img.bz2 Demonstration: # bzip2 -d < recoverbootsect.img.bz2 > /tmp/fat.img # losetup -o $((6 * 512)) /tmp/fat.img /dev/loop0 # dosfsck /dev/loop0 fsck.fat 4.2 (2021-01-31) Logical sector size is zero. # -- System Information: Debian Release: 13.2 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 6.12.57+deb13-amd64 (SMP w/12 CPU threads; PREEMPT) Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: sysvinit (via /sbin/init) LSM: AppArmor: enabled Versions of packages dosfstools depends on: ii libc6 2.41-12 dosfstools recommends no packages. dosfstools suggests no packages. -- no debconf information
