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85e833cd72
In ondemand mode, when the daemon is processing an open request, if the
kernel flags the cache as CACHEFILES_DEAD, the cachefiles_daemon_write()
will always return -EIO, so the daemon can't pass the copen to the kernel.
Then the kernel process that is waiting for the copen triggers a hung_task.
Since the DEAD state is irreversible, it can only be exited by closing
/dev/cachefiles. Therefore, after calling cachefiles_io_error() to mark
the cache as CACHEFILES_DEAD, if in ondemand mode, flush all requests to
avoid the above hungtask. We may still be able to read some of the cached
data before closing the fd of /dev/cachefiles.
Note that this relies on the patch that adds reference counting to the req,
otherwise it may UAF.
Fixes:
|
||
|---|---|---|
| .. | ||
| cache.c | ||
| daemon.c | ||
| error_inject.c | ||
| interface.c | ||
| internal.h | ||
| io.c | ||
| Kconfig | ||
| key.c | ||
| main.c | ||
| Makefile | ||
| namei.c | ||
| ondemand.c | ||
| security.c | ||
| volume.c | ||
| xattr.c | ||