[PATCH] nvme: don't allow unprivileged Write Zeroes passthrough on read-only FDs

[Christoph Hellwig]

On Thu, Dec 01, 2022 at 09:07:38AM -0700, Keith Busch wrote:
> On Tue, Nov 29, 2022 at 10:00:16AM +0100, Christoph Hellwig wrote:
> > -	if (nvme_is_write(c))
> > +	if (nvme_is_write(c) || c->common.opcode == nvme_cmd_write_zeroes)
> >  		return mode & FMODE_WRITE;
> 
> Write Uncorrectable should also be checked, and any future opcodes that
> can modify media. Maybe use Command Effects Log's LBCC field instead? We
> can preload known effects for older nvme's that don't support that log
> page.

Yes, that might be a better idea.  I'll try to find some time in
the next days to implement that.