5.15-stable review patch. If anyone has any objections, please let me know.
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From: Oleksandr Tymoshenko ovt@google.com
commit 3b6b99ef15ea37635604992ede9ebcccef38a239 upstream.
dentry_open in ovl_security_fileattr fails for any file larger than 2GB if open method of the underlying filesystem calls generic_file_open (e.g. fusefs).
The issue can be reproduce using the following script: (passthrough_ll is an example app from libfuse).
$ D=/opt/test/mnt $ mkdir -p ${D}/{source,base,top/uppr,top/work,ovlfs} $ dd if=/dev/zero of=${D}/source/zero.bin bs=1G count=2 $ passthrough_ll -o source=${D}/source ${D}/base $ mount -t overlay overlay \ -olowerdir=${D}/base,upperdir=${D}/top/uppr,workdir=${D}/top/work \ ${D}/ovlfs $ chmod 0777 ${D}/mnt/ovlfs/zero.bin
Running this script results in "Value too large for defined data type" error message from chmod.
Signed-off-by: Oleksandr Tymoshenko ovt@google.com Fixes: 72db82115d2b ("ovl: copy up sync/noatime fileattr flags") Cc: stable@vger.kernel.org # v5.15+ Signed-off-by: Amir Goldstein amir73il@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/overlayfs/inode.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -519,8 +519,13 @@ static int ovl_security_fileattr(struct struct file *file; unsigned int cmd; int err; + unsigned int flags;
- file = dentry_open(realpath, O_RDONLY, current_cred()); + flags = O_RDONLY; + if (force_o_largefile()) + flags |= O_LARGEFILE; + + file = dentry_open(realpath, flags, current_cred()); if (IS_ERR(file)) return PTR_ERR(file);