linux-kernel - [PATCH 22/25] elevate mnt writers for vfs

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 for Android: free password hash cracker in your pocket

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

Date:	Thu, 20 Sep 2007 12:53:17 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	akpm@...l.org
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org,
	Dave Hansen <haveblue@...ibm.com>
Subject: [PATCH 22/25] elevate mnt writers for vfs_unlink() callers



Acked-by: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Dave Hansen <haveblue@...ibm.com>
---

 lxc-dave/fs/namei.c   |    4 ++++
 lxc-dave/ipc/mqueue.c |    5 ++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff -puN fs/namei.c~elevate-mnt-writers-for-vfs-unlink-callers fs/namei.c
--- lxc/fs/namei.c~elevate-mnt-writers-for-vfs-unlink-callers	2007-09-20 12:16:21.000000000 -0700
+++ lxc-dave/fs/namei.c	2007-09-20 12:16:21.000000000 -0700
@@ -2228,7 +2228,11 @@ static long do_unlinkat(int dfd, const c
 		inode = dentry->d_inode;
 		if (inode)
 			atomic_inc(&inode->i_count);
+		error = mnt_want_write(nd.mnt);
+		if (error)
+			goto exit2;
 		error = vfs_unlink(nd.dentry->d_inode, dentry);
+		mnt_drop_write(nd.mnt);
 	exit2:
 		dput(dentry);
 	}
diff -puN ipc/mqueue.c~elevate-mnt-writers-for-vfs-unlink-callers ipc/mqueue.c
--- lxc/ipc/mqueue.c~elevate-mnt-writers-for-vfs-unlink-callers	2007-09-20 12:16:21.000000000 -0700
+++ lxc-dave/ipc/mqueue.c	2007-09-20 12:16:21.000000000 -0700
@@ -750,8 +750,11 @@ asmlinkage long sys_mq_unlink(const char
 	inode = dentry->d_inode;
 	if (inode)
 		atomic_inc(&inode->i_count);
-
+	err = mnt_want_write(mqueue_mnt);
+	if (err)
+		goto out_err;
 	err = vfs_unlink(dentry->d_parent->d_inode, dentry);
+	mnt_drop_write(mqueue_mnt);
 out_err:
 	dput(dentry);
 
_
-
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/