On Mon, Mar 08, 2021 at 12:12:22AM +0000, Al Viro wrote: > Wait, so you have /proc overmounted, without anything autofs-related on > /proc/sys/fs/binfmt_misc and still want to have the pathname resolved, just > because it would've resolved with that overmount of /proc removed? > > I hope I'm misreading you; in case I'm not, the ABI is extremely > tasteless and until you manage to document the exact semantics you want > for param->path, consider it NAKed. BTW, if that thing would be made to work, what's to stop somebody from doing ...at() syscalls with the resulting fd as a starting point and pathnames starting with ".."? "/foo is overmounted, but we can get to anything under /foo/bar/ in the underlying tree since there's an autofs mount somewhere in /foo/bar/splat/puke/*"? IOW, the real question (aside of "WTF?") is what are you using the resulting descriptor for and what do you need to be able to do with it. Details, please.
