linux-kernel - [PATCH 2/3] sysfs: remove error messages for -EEXIST case

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-next>] [day] [month] [year] [list]

Message-ID: <20080514181603.411e834f@extreme>
Date:	Wed, 14 May 2008 18:16:03 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Greg KH <greg@...ah.com>, David Miller <davem@...emloft.net>,
	fubar@...ibm.com
Cc:	netdev@...r.kernel.org, bonding-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] sysfs: remove error messages for -EEXIST case

It is possible that the entry in sysfs already exists, one case of this is
when a network device is renamed to bonding_masters. Anyway, in this case
the proper error path is for device_rename to return an error code, not to
generate bogus backtrace and errors.

Also, to avoid possible races, the create link should be done before the
remove link. This makes a device rename atomic operation like other renames.

Signed-off-by: Stephen Hemminger <shemminger@...tta.com>

--- a/drivers/base/core.c	2008-05-14 17:56:36.000000000 -0700
+++ b/drivers/base/core.c	2008-05-14 17:56:40.000000000 -0700
@@ -1218,13 +1218,11 @@ int device_rename(struct device *dev, ch
 	}
 #else
 	if (dev->class) {
-		sysfs_remove_link(&dev->class->subsys.kobj, old_device_name);
 		error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj,
 					  dev->bus_id);
-		if (error) {
-			dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n",
-				__func__, error);
-		}
+		if (error)
+			goto out;
+		sysfs_remove_link(&dev->class->subsys.kobj, old_device_name);
 	}
 #endif
 
--- a/fs/sysfs/dir.c	2008-05-14 17:56:36.000000000 -0700
+++ b/fs/sysfs/dir.c	2008-05-14 17:56:40.000000000 -0700
@@ -419,12 +419,8 @@ void sysfs_addrm_start(struct sysfs_addr
  */
 int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
 {
-	if (sysfs_find_dirent(acxt->parent_sd, sd->s_name)) {
-		printk(KERN_WARNING "sysfs: duplicate filename '%s' "
-		       "can not be created\n", sd->s_name);
-		WARN_ON(1);
+	if (sysfs_find_dirent(acxt->parent_sd, sd->s_name))
 		return -EEXIST;
-	}
 
 	sd->s_parent = sysfs_get(acxt->parent_sd);
 
--
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/