linux

iv/linux

History

Miklos Szeredi 56230d9567 ovl: verify permissions in ovl_path_open()

Check permission before opening a real file.

ovl_path_open() is used by readdir and copy-up routines.

ovl_permission() theoretically already checked copy up permissions, but it
doesn't hurt to re-do these checks during the actual copy-up.

For directory reading ovl_permission() only checks access to topmost
underlying layer.  Readdir on a merged directory accesses layers below the
topmost one as well.  Permission wasn't checked for these layers.

Note: modifying ovl_permission() to perform this check would be far more
complex and hence more bug prone.  The result is less precise permissions
returned in access(2).  If this turns out to be an issue, we can revisit
this bug.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

2020-06-02 22:20:26 +02:00

copy_up.c

ovl: prepare to copy up without workdir

2020-05-13 11:11:24 +02:00

dir.c

ovl: initialize OVL_UPPERDATA in ovl_lookup()

2020-06-02 22:20:25 +02:00

export.c

ovl: return required buffer size for file handles

2020-05-13 11:11:24 +02:00

file.c

ovl: fix lockdep warning for async write