mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2026-06-02 09:46:37 +03:00
5e7b138490
The disk_read() and disk_write() functions of the FAT driver use the blk_dread() and blk_dwrite() respectively. The blk_* APIs read and write to the devices in terms of the device block size. However, the FAT driver reads in terms of the device block size (from fat_set_blk_dev and read_bootsectandvi) and sector size in the rest of the places. This causes buffer overflows or partial reads when the FAT sector size is not equal to device block size. Fix this by using blk_dread in fat_set_blk_dev and read_bootsectandvi instead of disk_read. And update disk_read/disk_write to handle FAT sector size and block size mismatch. Tested on blksz | FAT sector size ------+---------------- 4096 | 4096 512 | 512 4096 | 512 512 | 4096 Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan@oss.qualcomm.com>
40 lines
1.3 KiB
Plaintext
40 lines
1.3 KiB
Plaintext
config FS_FAT
|
|
bool "Enable FAT filesystem support"
|
|
help
|
|
This provides support for reading images from File Allocation Table
|
|
(FAT) filesystem. FAT filesystem is a legacy, lightweight filesystem.
|
|
It is useful mainly for its wide compatibility with various operating
|
|
systems. You can also enable CMD_FAT to get access to fat commands.
|
|
|
|
config FAT_WRITE
|
|
bool "Enable FAT filesystem write support"
|
|
depends on FS_FAT
|
|
help
|
|
This provides support for creating and writing new files to an
|
|
existing FAT filesystem partition.
|
|
|
|
config FAT_RENAME
|
|
bool "Enable filesystem rename support"
|
|
depends on FAT_WRITE
|
|
help
|
|
This provides support for renaming and moving files within a
|
|
FAT filesystem partition.
|
|
|
|
config FS_FAT_MAX_CLUSTSIZE
|
|
int "Set maximum possible clustersize"
|
|
default 65536
|
|
depends on FS_FAT
|
|
help
|
|
Set the maximum possible clustersize for the FAT filesytem. This
|
|
is the smallest amount of disk space that can be used to hold a
|
|
file. Unless you have an extremely tight memory memory constraints,
|
|
leave the default.
|
|
|
|
config FS_FAT_HANDLE_SECTOR_SIZE_MISMATCH
|
|
bool "Handle FAT sector size mismatch"
|
|
default n
|
|
depends on FS_FAT
|
|
help
|
|
Handle filesystems on media where the hardware block size and
|
|
the sector size in the FAT metadata do not match.
|