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[ntp][apparmor] Allow apparmor read permission for ntpd under rw mount path of rootfs (#6040)

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Certain platform specific packages sonic-platform-xyz, installs files onto rootfs, which would be placed on read-write mount path on /host/image-name/rw/...
when ntpd starts it tries to do read access on /usr/bin /usr/sbin/ /usr/local/bin , which inturn links further to the read-write mount path also.
Where ntpd would get below Apparmor Warning message

LOG:-
audit: type=1400 audit(1606226503.240:21): apparmor="DENIED" operation="open" profile="/usr/sbin/ntpd" name="/image-HEAD-dirty-20201111.173951/rw/usr/local/bin/" pid=3733 comm="ntpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
audit: type=1400 audit(1606226503.240:22): apparmor="DENIED" operation="open" profile="/usr/sbin/ntpd" name="/image-HEAD-dirty-20201111.173951/rw/usr/sbin/" pid=3733 comm="ntpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
audit: type=1400 audit(1606226503.240:23): apparmor="DENIED" operation="open" profile="/usr/sbin/ntpd" name="/image-HEAD-dirty-20201111.173951/rw/usr/bin/" pid=3733 comm="ntpd" requested_mask="r" denied_mask="r" fsuid=0 ouid=0

Fix:
Add rw/.. mount path similar to root path access provided for ntpd in /etc/apparmor.d/usr.sbin.ntpd

Signed-off-by: Antony Rheneus <arheneus@marvell.com>
This commit is contained in:
arheneus@marvell.com 2020-12-18 18:27:35 +05:30 committed by GitHub
parent 54681f169f
commit e88c7d11ca
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1
build_debian.sh
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@ -192,6 +192,7 @@ echo '[INFO] Install docker'
## Install apparmor utils since they're missing and apparmor is enabled in the kernel
## Otherwise Docker will fail to start
sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install apparmor
sudo cp files/image_config/ntp/ntp-apparmor $FILESYSTEM_ROOT/etc/apparmor.d/local/usr.sbin.ntpd
sudo LANG=C chroot $FILESYSTEM_ROOT apt-get -y install apt-transport-https \
ca-certificates \
curl \

9
files/image_config/ntp/ntp-apparmor Normal file
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@ -0,0 +1,9 @@
# Apparmor configuration
# /etc/apparmor.d/local/usr.sbin.ntpd
# Allow read access to "rw" mount path of fs.squashfs
# Eg: /host/image-HEAD-sonic.../rw/usr/sbin
/**/{,s}bin/ r,
/**/usr/{,s}bin/ r,
/**/usr/local/{,s}bin/ r,