This is a note to let you know that I've just added the patch titled

partitions/msdos: Unable to mount UFS 44bsd partitions

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: partitions-msdos-unable-to-mount-ufs-44bsd-partitions.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 5f15684bd5e5ef39d4337988864fec8012471dda Mon Sep 17 00:00:00 2001

From: Richard Narron comet.berkeley@gmail.com Date: Wed, 10 Jan 2018 09:12:16 -0700 Subject: partitions/msdos: Unable to mount UFS 44bsd partitions

From: Richard Narron comet.berkeley@gmail.com

commit 5f15684bd5e5ef39d4337988864fec8012471dda upstream.

UFS partitions from newer versions of FreeBSD 10 and 11 use relative addressing for their subpartitions. But older versions of FreeBSD still use absolute addressing just like OpenBSD and NetBSD.

Instead of simply testing for a FreeBSD partition, the code needs to also test if the starting offset of the C subpartition is zero.

https://bugzilla.kernel.org/show_bug.cgi?id=197733

Signed-off-by: Richard Narron comet.berkeley@gmail.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- block/partitions/msdos.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/block/partitions/msdos.c +++ b/block/partitions/msdos.c @@ -301,7 +301,9 @@ static void parse_bsd(struct parsed_part continue; bsd_start = le32_to_cpu(p->p_offset); bsd_size = le32_to_cpu(p->p_size); - if (memcmp(flavour, "bsd\0", 4) == 0) + /* FreeBSD has relative offset if C partition offset is zero */ + if (memcmp(flavour, "bsd\0", 4) == 0 && + le32_to_cpu(l->d_partitions[2].p_offset) == 0) bsd_start += offset; if (offset == bsd_start && size == bsd_size) /* full parent partition, we have it already */

Patches currently in stable-queue which might be from comet.berkeley@gmail.com are

queue-4.15/partitions-msdos-unable-to-mount-ufs-44bsd-partitions.patch