tree f98bb9878d2c9d7c49efa707c6ce621d4ac6432d
parent 6864abfa9d17af0cd86a0740288c74fe09fb7da0
author Oleksandr Tymoshenko <ovt@google.com> 1730240429 +0000
committer Oleksandr Tymoshenko <ovt@google.com> 1731221061 +0000

ovl: properly handle large files in ovl_security_fileattr

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.

BUG=b/374347716
TEST=presubmit
RELEASE_NOTE=None

Signed-off-by: Oleksandr Tymoshenko <ovt@google.com>
Fixes: 72db82115d2b ("ovl: copy up sync/noatime fileattr flags")
Cc: stable@vger.kernel.org # v5.15+
Change-Id: Ic80b271719e4201e38d99cf6560226c51b7e3273
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/85782
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Kevin Berry <kpberry@google.com>