Hi, We want to run some processes in the procd-ujail, this works when we use a SquashFS image and an overlay file system, but when we use an initramfs it does not work.
We see the following error message: -------------- Fri Oct 18 16:31:51 2019 user.err : jail: pivot_root(/tmp/ujail-ngPNoo, /tmp/ujail-ngPNoo/old) failed: Invalid argument Fri Oct 18 16:31:51 2019 user.err : jail: failed to build jail fs -------------- It is failing here: https://git.openwrt.org/?p=project/procd.git;a=blob;f=jail/jail.c;h=54e78419b539ae6b618bc3680c01fdd9582ea318;hb=HEAD#l158 There is the following code in procd jail.c which looks to me like it should prevent this problem: -------------- /* oldroot can't be MS_SHARED else pivot_root() fails */ if (mount("none", "/", NULL, MS_REC|MS_PRIVATE, NULL)) { ERROR("private mount failed %m\n"); return -1; } -------------- https://git.openwrt.org/?p=project/procd.git;a=blob;f=jail/jail.c;h=54e78419b539ae6b618bc3680c01fdd9582ea318;hb=HEAD#l133 When we switch from initramfs to tmpfs, it is working, we added this code to target/linux/generic/other-files/init to make it work: --- a/target/linux/generic/other-files/init +++ b/target/linux/generic/other-files/init @@ -1,4 +1,14 @@ #!/bin/sh # Copyright (C) 2006 OpenWrt.org export INITRAMFS=1 -exec /sbin/init + +# switch to tmpfs to allow run daemons in jail on initramfs boot +DIRS=$(echo *) +NEW_ROOT=/new_root + +mkdir -p $NEW_ROOT +mount -t tmpfs tmpfs $NEW_ROOT + +cp -pr $DIRS $NEW_ROOT + +exec switch_root $NEW_ROOT /sbin/init We see this on a MIPS BE system running OpenWrt master from beginning of March 2019 with kernel 4.9. I also see this problem also on the MIPS Malta 32 bit BE target of today's OpenWrt master using this configuration and with the patch in this mail I do not see it any more: CONFIG_TARGET_malta=y CONFIG_TARGET_malta_be=y CONFIG_TARGET_malta_be_Default=y CONFIG_PACKAGE_procd-ujail=y Hauke _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
