From: Trond Myklebust Date: Thu, 27 Jun 2019 10:41:45 +0000 (-0400) Subject: NFSv4: Handle the special Linux file open access mode X-Git-Tag: v5.1.20~93 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3dd02f968711844b132a1db7e46df8a2a660489;p=thirdparty%2Fkernel%2Fstable.git NFSv4: Handle the special Linux file open access mode commit 44942b4e457beda00981f616402a1a791e8c616e upstream. According to the open() manpage, Linux reserves the access mode 3 to mean "check for read and write permission on the file and return a file descriptor that can't be used for reading or writing." Currently, the NFSv4 code will ask the server to open the file, and will use an incorrect share access mode of 0. Since it has an incorrect share access mode, the client later forgets to send a corresponding close, meaning it can leak stateids on the server. Fixes: ce4ef7c0a8a05 ("NFS: Split out NFS v4 file operations") Cc: stable@vger.kernel.org # 3.6+ Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 414a90d48493d..e94af89ac8770 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -1094,6 +1094,7 @@ int nfs_open(struct inode *inode, struct file *filp) nfs_fscache_open_file(inode, filp); return 0; } +EXPORT_SYMBOL_GPL(nfs_open); /* * This function is called whenever some part of NFS notices that diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index f10b660805fc4..1cf694c6ee67a 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -49,7 +49,7 @@ nfs4_file_open(struct inode *inode, struct file *filp) return err; if ((openflags & O_ACCMODE) == 3) - openflags--; + return nfs_open(inode, filp); /* We can't create new files here */ openflags &= ~(O_CREAT|O_EXCL);