Simon Tatham 5ecc33b454 affs: don't write overlarge OFS data block size fields ... [ Upstream commit 011ea742a2 ] If a data sector on an OFS floppy contains a value > 0x1e8 (the largest amount of data that fits in the sector after its header), then an Amiga reading the file can return corrupt data, by taking the overlarge size at its word and reading past the end of the buffer it read the disk sector into! The cause: when affs_write_end_ofs() writes data to an OFS filesystem, the new size field for a data block was computed by adding the amount of data currently being written (into the block) to the existing value of the size field. This is correct if you're extending the file at the end, but if you seek backwards in the file and overwrite _existing_ data, it can lead to the size field being larger than the maximum legal value. This commit changes the calculation so that it sets the size field to the max of its previous size and the position within the block that we just wrote up to. Signed-off-by: Simon Tatham <anakin@pobox.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org> (cherry picked from commit 54fd5a5b7583f1964a79e9efe02e30e97b61eb95)		2025-04-14 15:49:35 +08:00
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Changes	…
Kconfig	fs: add CONFIG_BUFFER_HEAD	2023-08-02 09:13:09 -06:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
affs.h	fs: port ->rename() to pass mnt_idmap	2023-01-19 09:24:26 +01:00
amigaffs.c	affs: convert to ctime accessor functions	2023-07-13 10:28:03 +02:00
amigaffs.h	fs: affs: Initialize filesystem timestamp ranges	2019-08-30 07:27:18 -07:00
bitmap.c	Rename superblock flags (MS_xyz -> SB_xyz)	2017-11-27 13:05:09 -08:00
dir.c	iversion: Rename make inode_cmp_iversion{+raw} to inode_eq_iversion{+raw}	2018-02-01 08:15:25 -05:00
file.c	affs: don't write overlarge OFS data block size fields	2025-04-14 15:49:35 +08:00
inode.c	affs: convert to ctime accessor functions	2023-07-13 10:28:03 +02:00
namei.c	affs: rename local toupper() to fn() to avoid confusion	2023-08-22 14:20:10 +02:00
super.c	affs: move from strlcpy with unused retval to strscpy	2022-08-19 13:03:10 +02:00
symlink.c	affs: convert affs_symlink_read_folio() to use the folio	2023-08-18 10:12:29 -07:00