[PATCH 5.10 0/2] Backport two overlayfs fixed to 5.10.y

[Amir Goldstein <amir73il@gmail.com>]

Greg,

These two patches have been (correctly) auto selected to 5.15.y
along with the two dependency patches tagged with:
Stable-dep-of: b306e90ffabd ("ovl: remove privs in ovl_copyfile()")
9636e70ee2d3 ("ovl: use ovl_copy_{real,upper}attr() wrappers")
a54843833caf ("ovl: store lower path in ovl_inode")

It wasn't wrong to apply those patches with the two dependencies
to 5.15.y, but it is not as easy to do for 5.10.y, so here is a
very simple backport of the two fixes to 5.10.y, i.e.:
replaced ovl_copyattr(X) with ovl_copyattr(ovl_inode_real(X), X).

Note that the language "This fixes some failure in fstests..."
in commit message means that those fixes are not enough for the
tests to pass. Additional backports from v6.2 are needed for the
tests to pass and I am collaborating those backports with Leah,
so they will hit 5.15.y first before posting them for 5.10.y.

Never the less, these overlayfs fixes are important security
fixes, so they should be applied to LTS kernel even before
all the cases in the fstests are fixed.

Thanks,
Amir.

Amir Goldstein (2):
  ovl: remove privs in ovl_copyfile()
  ovl: remove privs in ovl_fallocate()

 fs/overlayfs/file.c | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

-- 
2.34.1