69baa3a623
User should not be able to write block device if it is read-only at
block level (e.g force_ro attribute). This is ensured in the regular
fops write operation (blkdev_write_iter) but not when writing via
user mapping (mmap), allowing user to actually write a read-only
block device via a PROT_WRITE mapping.
Example: This can lead to integrity issue of eMMC boot partition
(e.g mmcblk0boot0) which is read-only by default.
To fix this issue, simply deny shared writable mapping if the block
is readonly.
Note: Block remains writable if switch to read-only is performed
after the initial mapping, but this is expected behavior according
to commit
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|---|---|---|
| .. | ||
| partitions | ||
| Kconfig | ||
| Kconfig.iosched | ||
| Makefile | ||
| badblocks.c | ||
| bdev.c | ||
| bfq-cgroup.c | ||
| bfq-iosched.c | ||
| bfq-iosched.h | ||
| bfq-wf2q.c | ||
| bio-integrity.c | ||
| bio.c | ||
| blk-cgroup-fc-appid.c | ||
| blk-cgroup-rwstat.c | ||
| blk-cgroup-rwstat.h | ||
| blk-cgroup.c | ||
| blk-cgroup.h | ||
| blk-core.c | ||
| blk-crypto-fallback.c | ||
| blk-crypto-internal.h | ||
| blk-crypto-profile.c | ||
| blk-crypto-sysfs.c | ||
| blk-crypto.c | ||
| blk-flush.c | ||
| blk-ia-ranges.c | ||
| blk-integrity.c | ||
| blk-ioc.c | ||
| blk-iocost.c | ||
| blk-iolatency.c | ||
| blk-ioprio.c | ||
| blk-ioprio.h | ||
| blk-lib.c | ||
| blk-map.c | ||
| blk-merge.c | ||
| blk-mq-cpumap.c | ||
| blk-mq-debugfs-zoned.c | ||
| blk-mq-debugfs.c | ||
| blk-mq-debugfs.h | ||
| blk-mq-pci.c | ||
| blk-mq-sched.c | ||
| blk-mq-sched.h | ||
| blk-mq-sysfs.c | ||
| blk-mq-tag.c | ||
| blk-mq-virtio.c | ||
| blk-mq.c | ||
| blk-mq.h | ||
| blk-pm.c | ||
| blk-pm.h | ||
| blk-rq-qos.c | ||
| blk-rq-qos.h | ||
| blk-settings.c | ||
| blk-stat.c | ||
| blk-stat.h | ||
| blk-sysfs.c | ||
| blk-throttle.c | ||
| blk-throttle.h | ||
| blk-timeout.c | ||
| blk-wbt.c | ||
| blk-wbt.h | ||
| blk-zoned.c | ||
| blk.h | ||
| bounce.c | ||
| bsg-lib.c | ||
| bsg.c | ||
| disk-events.c | ||
| elevator.c | ||
| elevator.h | ||
| fops.c | ||
| genhd.c | ||
| holder.c | ||
| ioctl.c | ||
| ioprio.c | ||
| kyber-iosched.c | ||
| mq-deadline.c | ||
| opal_proto.h | ||
| sed-opal.c | ||
| t10-pi.c | ||