filelocks: use mount idmapping for setlease permission check

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commit 42d0c4bdf7 upstream.

A user should be allowed to take out a lease via an idmapped mount if
the fsuid matches the mapped uid of the inode. generic_setlease() is
checking the unmapped inode uid, causing these operations to be denied.

Fix this by comparing against the mapped inode uid instead of the
unmapped uid.

Fixes: 9caccd4154 ("fs: introduce MOUNT_ATTR_IDMAP")
Cc: stable@vger.kernel.org
Signed-off-by: Seth Forshee (DigitalOcean) <sforshee@kernel.org>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Seth Forshee 2023-03-09 14:39:09 -06:00 • committed by Greg Kroah-Hartman

parent a8691ec981

commit c20fb060ce

1 changed files with 2 additions and 1 deletions

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fs/locks.c

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