ovl: drop CAP_SYS_RESOURCE from saved mounter's credentials
authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>
Tue, 10 Jan 2017 18:30:21 +0000 (21:30 +0300)
committerMiklos Szeredi <mszeredi@redhat.com>
Tue, 7 Feb 2017 14:47:14 +0000 (15:47 +0100)
commit51f8f3c4e22535933ef9aecc00e9a6069e051b57
treeb5ca89d2ee7d508616995e9b68792fb8363e844c
parente593b2bf513dd4d3fbfa0f435392eea2c7f776f0
ovl: drop CAP_SYS_RESOURCE from saved mounter's credentials

If overlay was mounted by root then quota set for upper layer does not work
because overlay now always use mounter's credentials for operations.
Also overlay might deplete reserved space and inodes in ext4.

This patch drops capability SYS_RESOURCE from saved credentials.
This affects creation new files, whiteouts, and copy-up operations.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Fixes: 1175b6b8d963 ("ovl: do operations on underlying file system in mounter's context")
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
fs/overlayfs/super.c