From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:44080 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726500AbfACTP7 (ORCPT ); Thu, 3 Jan 2019 14:15:59 -0500 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5967563816 for ; Thu, 3 Jan 2019 19:15:59 +0000 (UTC) Received: from [IPv6:::1] (ovpn04.gateway.prod.ext.phx2.redhat.com [10.5.9.4]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2E8B95D6A6 for ; Thu, 3 Jan 2019 19:15:59 +0000 (UTC) From: Eric Sandeen Subject: [PATCH] xfs_repair: allow '/' in attribute names Message-ID: <1c673348-0244-89ff-5b3c-545ee3e458e4@redhat.com> Date: Thu, 3 Jan 2019 13:15:56 -0600 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: linux-xfs For some reason, since the earliest days of XFS, a '/' character in an extended attribute name has been treated as corruption by xfs_repair. This despite nothing in other userspace tools or the kernel having this restriction. My best guess is that this was an unintentional leftover from common code between dirs & attrs in the "da" code, and there has never been a good reason for it. Since userspace and kernelspace allow such a name to be set, listed, and read, it seems wrong to flag it as corruption. So, make this test conditional on whether we're validating a name in a dir, as opposed to the name of an attr. Signed-off-by: Eric Sandeen --- diff --git a/repair/attr_repair.c b/repair/attr_repair.c index 1d04500..2f6f7ef 100644 --- a/repair/attr_repair.c +++ b/repair/attr_repair.c @@ -292,11 +292,9 @@ process_shortform_attr( } } - /* namecheck checks for / and null terminated for file names. - * attributes names currently follow the same rules. - */ + /* namecheck checks for null chars in attr names. */ if (namecheck((char *)¤tentry->nameval[0], - currententry->namelen)) { + currententry->namelen, false)) { do_warn( _("entry contains illegal character in shortform attribute name\n")); junkit = 1; @@ -459,7 +457,7 @@ process_leaf_attr_local( local = xfs_attr3_leaf_name_local(leaf, i); if (local->namelen == 0 || namecheck((char *)&local->nameval[0], - local->namelen)) { + local->namelen, false)) { do_warn( _("attribute entry %d in attr block %u, inode %" PRIu64 " has bad name (namelen = %d)\n"), i, da_bno, ino, local->namelen); @@ -514,7 +512,7 @@ process_leaf_attr_remote( remotep = xfs_attr3_leaf_name_remote(leaf, i); if (remotep->namelen == 0 || namecheck((char *)&remotep->name[0], - remotep->namelen) || + remotep->namelen, false) || be32_to_cpu(entry->hashval) != libxfs_da_hashname((unsigned char *)&remotep->name[0], remotep->namelen) || diff --git a/repair/da_util.c b/repair/da_util.c index 1450767..1f6568e 100644 --- a/repair/da_util.c +++ b/repair/da_util.c @@ -13,20 +13,25 @@ #include "da_util.h" /* - * takes a name and length (name need not be null-terminated) - * and returns 1 if the name contains a '/' or a \0, returns 0 - * otherwise + * takes a name and length (name need not be null-terminated) and whether + * we are checking a dir (vs an attr), and returns 1 if the direntry contains + * a '/', or if anything contains a \0, and returns 0 otherwise */ int -namecheck(char *name, int length) +namecheck( + char *name, + int length, + bool isadir) { - char *c; - int i; + char *c; + int i; ASSERT(length < MAXNAMELEN); for (c = name, i = 0; i < length; i++, c++) { - if (*c == '/' || *c == '\0') + if (isadir && *c == '/') + return 0; + if (*c == '\0') return 1; } diff --git a/repair/da_util.h b/repair/da_util.h index d36dfd0..041dff7 100644 --- a/repair/da_util.h +++ b/repair/da_util.h @@ -27,7 +27,8 @@ typedef struct da_bt_cursor { int namecheck( char *name, - int length); + int length, + bool isadir); struct xfs_buf * da_read_buf( diff --git a/repair/dir2.c b/repair/dir2.c index ba5763e..6d592d6 100644 --- a/repair/dir2.c +++ b/repair/dir2.c @@ -310,7 +310,7 @@ _("entry #%d %s in shortform dir %" PRIu64), * the length value is stored in a byte * so it can't be too big, it can only wrap */ - if (namecheck((char *)&sfep->name[0], namelen)) { + if (namecheck((char *)&sfep->name[0], namelen, true)) { /* * junk entry */ @@ -781,7 +781,7 @@ _("\twould clear inode number in entry at offset %" PRIdPTR "...\n"), * during phase 4. */ junkit = dep->name[0] == '/'; - nm_illegal = namecheck((char *)dep->name, dep->namelen); + nm_illegal = namecheck((char *)dep->name, dep->namelen, true); if (ino_discovery && nm_illegal) { do_warn( _("entry at block %u offset %" PRIdPTR " in directory inode %" PRIu64 " has illegal name \"%*.*s\": "),