Hi, While trying to figure out what exactly is going on with permission checking in OverlayFS, I found a pretty simple way to, so it seems, fix it. The problem I was having is triggered with the following setup: drwxr-xr-x lower/ drwx------ lower/foo/ drw-r--r-- lower/boo/bar drwxr-xr-x upper/ drwxr-xr-x upper/foo/ mounted with lower/ as the lowerdir and upper/ as the upperdir. The issue is that when caches are empty, any user who is not the owner of lower/foo/ and who tries to access foo/bar on the mounted overlay gets EACCES. Once the owner accesses foo/bar, that positive result it cached and other users can access foo/bar as expected. It would be nice if someone could take a look at the patch that follows and give me some feedback. The fix is simple, but a bit intrusive and I wonder whether this is necessarily the way to go. Cheers, Ignacy Ignacy Gawędzki (1): OverlayFS: Fix checking permissions during lookup. fs/namei.c | 21 ++++++++++++++++++++- fs/overlayfs/super.c | 2 +- include/linux/namei.h | 1 + 3 files changed, 22 insertions(+), 2 deletions(-) -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
