On 2020-07-24 at 07:45, Greg Wooledge wrote: > On Thu, Jul 23, 2020 at 07:16:06PM -0400, The Wanderer wrote: > >> On 2020-07-23 at 06:26, Andrei POPESCU wrote: >>> Seriously? Could you please show me how would I create a file on >>> *nix containing '/' in the name? >> >> It's theoretically possible, but AFAIK basically nothing would >> support it or work properly with it. >> >> The only ways I can think of to do it that I wouldn't expect to be >> prohibited by the intermediary layers involved (such as the C >> standard library) would be A: direct file I/O not involving a >> library (which I'd guess would probably need to be written in >> architecture-specific ASM), and B: opening the device underlying >> the filesystem in a hex editor or similar and modifying the stored >> data in the inode. > > The main way that one gets a filename containing a '/' character in > real life is by discovering a bug somewhere. > > I've personally seen it once, on an old HP-UX system that was acting > as an NFS server for some Mac clients (long before Mac OS X). > Apparently the NFS server allowed the clients to create filenames > with slashes in them, since that's legal on Mac OS 9 and earlier. > Once such a file was created on the server, you couldn't do > *anything* to it. You couldn't delete it, or rename it, or open it. > The only thing you could do was move out all of the other files in > the same directory, then rename the directory that it's in to > something like "xxx_radioactive_waste". Then recreate the original > directory, and move all the other files back into it. Sounds like a case where directly editing the underlying device, to modify inode-or-equivalent contents such that the slash is no longer there, might even be *advisable*. I've seen enough random filename bit-flips in my time that I wouldn't be surprised if it sometimes happened by simple "routine" filesystem corruption. -- The Wanderer The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. -- George Bernard Shaw
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