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ovl: properly handle large files in ovl_security_fileattr

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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: 72db82115d ("ovl: copy up sync/noatime fileattr flags")
Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
This commit is contained in:
Oleksandr Tymoshenko 2024-10-30 00:28:55 +00:00 committed by Amir Goldstein
parent 2d5404caa8
commit 3b6b99ef15
1 changed files with 6 additions and 1 deletions
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7
fs/overlayfs/inode.c
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@ -616,8 +616,13 @@ static int ovl_security_fileattr(const struct path *realpath, struct fileattr *f
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);