linux-kernel - RE: [PATCH v2 02/10] fs/ntfs3: Add initialization of super block

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Message-ID: <208746d50bbf4ffc8de599a4e10befd8@paragon-software.com>
Date:   Thu, 27 Aug 2020 16:20:14 +0000
From:   Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To:     Pali Rohár <pali@...nel.org>
CC:     "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: RE: [PATCH v2 02/10] fs/ntfs3: Add initialization of super block

From: Pali Rohár <pali@...nel.org>
Sent: Sunday, August 23, 2020 12:55 PM
> 
> On Friday 21 August 2020 16:25:03 Konstantin Komarov wrote:
> > +		case Opt_nls:
> > +			match_strlcpy(nls_name, &args[0], sizeof(nls_name));
> > +			break;
> > +
> > +		/* unknown option */
> > +		default:
> > +			if (!silent)
> > +				ntfs_error(
> > +					sb,
> > +					"Unrecognized mount option \"%s\" or missing value",
> > +					p);
> > +			//return -EINVAL;
> > +		}
> > +	}
> > +
> > +out:
> > +	if (nls_name[0]) {
> > +		sbi->nls = load_nls(nls_name);
> > +		if (!sbi->nls) {
> > +			/* critical ?*/
> > +			ntfs_error(sb, "failed to load \"%s\"\n", nls_name);
> > +			//return -EINVAL;
> 
> Well, I think it is a fatal error if user supplied NLS encoding cannot
> be loaded. If user via mount parameter specify that wants encoding XYZ
> and kernel loads different (e.g. default one) then userspace would be
> confused as it would expect encoding XYZ.
> 

Agreed. Will be fixed in V3.

> > +		}
> > +	}
> > +
> > +	if (!sbi->nls) {
> > +		sbi->nls = load_nls_default();
> > +		if (!sbi->nls) {
> > +			/* critical */
> > +			ntfs_error(sb, "failed to load default nls");
> > +			return -EINVAL;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}