Re: [syzbot] [hfs?] WARNING in hfs_write_inode

[John Paul Adrian Glaubitz]

Hello Arnd!

On 1/4/23 23:33, Arnd Bergmann wrote:
> Adding Viacheslav Dubeyko to Cc, he's at least been reviewing
> patches for HFS and HFS+ somewhat recently. The linux-m68k
> list may have some users dual-booting old MacOS.

HFS/HFS+ is also used by PowerPC users on PowerMac hardware for both
exchanging data between MacOS and Linux as well as for booting Linux
using GRUB with a HFS/HFS+ /boot partition.

Debian's grub-installer creates an HFS partition from which GRUB loads
the kernel and the initrd [1]. In order to be able to update kernel and
initrd, the running Linux system needs to be able to read/write HFS/HFS+
partitions which is used for the /boot partition.

Adrian

> [1] https://salsa.debian.org/installer-team/grub-installer/-/blob/master/grub-installer#L918

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