Package: dosfstools Version: 4.2-1.2 Severity: minor Tags: upstream X-Debbugs-Cc: [email protected]
Dear Maintainer, dosfsck trashes really old FAT that doesn't have a volume label in the boot sector. This renders previously bootable filesystems unbootable. Example case: https://github.com/joshudson/dossuperfloppy/raw/refs/heads/master/scantests/basefat16.img.bz2 The FAT boot sector is at sector 7. Hexdump: 00000000 eb 28 90 49 42 4d 20 20 32 2e 30 00 02 08 01 00 |ë(.IBM 2.0.....| 00000010 02 00 02 f9 7f f8 10 00 20 00 04 00 07 00 00 00 |...ù.ø.. .......| 00000020 00 00 00 00 80 00 28 11 11 11 11 00 00 00 00 00 |......(.........| 00000030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 80 55 aa |..............Uª| 00000200 In this boot sector, offset 0x26 is not 0x29; therefore there is no volume label, and the boot sector code starts at offset 0x2B. (As this is actually a mock-up test case there isn't any actual boot code there, but a DOS 2.x or 3.0 boot sector will be destroyed and the boot disk rendered unbootable.) -- 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
