linux-kernel - [PATCH 10/15] knfsd: Validate filehandle type in fsid

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <11882461773221-git-send-email-bfields@fieldses.org>
Date:	Mon, 27 Aug 2007 16:22:51 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	linux-kernel@...r.kernel.org
Cc:	nfs@...ts.sourceforge.net, Neil Brown <neilb@...e.de>,
	"Luiz Fernando N. Capitulino" <lcapitulino@...il.com>,
	"J. Bruce Fields" <bfields@...i.umich.edu>
Subject: [PATCH 10/15] knfsd: Validate filehandle type in fsid_source

From: Neil Brown <neilb@...e.de>

fsid_source decided where to get the 'fsid' number to
return for a GETATTR based on the type of filehandle.
It can be from the device, from the fsid, or from the
UUID.

It is possible for the filehandle to be inconsistent
with the export information, so make sure the export information
actually has the info implied by the value returned by
fsid_source.

Signed-off-by: Neil Brown <neilb@...e.de>
Cc: "Luiz Fernando N. Capitulino" <lcapitulino@...il.com>
Signed-off-by: "J. Bruce Fields" <bfields@...i.umich.edu>
---
 fs/nfsd/nfsfh.c |   20 +++++++++++++++-----
 1 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 0eb464a..7011d62 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -566,13 +566,23 @@ enum fsid_source fsid_source(struct svc_fh *fhp)
 	case FSID_DEV:
 	case FSID_ENCODE_DEV:
 	case FSID_MAJOR_MINOR:
-		return FSIDSOURCE_DEV;
+		if (fhp->fh_export->ex_dentry->d_inode->i_sb->s_type->fs_flags
+		    & FS_REQUIRES_DEV)
+			return FSIDSOURCE_DEV;
+		break;
 	case FSID_NUM:
-		return FSIDSOURCE_FSID;
-	default:
 		if (fhp->fh_export->ex_flags & NFSEXP_FSID)
 			return FSIDSOURCE_FSID;
-		else
-			return FSIDSOURCE_UUID;
+		break;
+	default:
+		break;
 	}
+	/* either a UUID type filehandle, or the filehandle doesn't
+	 * match the export.
+	 */
+	if (fhp->fh_export->ex_flags & NFSEXP_FSID)
+		return FSIDSOURCE_FSID;
+	if (fhp->fh_export->ex_uuid)
+		return FSIDSOURCE_UUID;
+	return FSIDSOURCE_DEV;
 }
-- 
1.5.3.rc5.19.g0734d

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/