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initramfs/debian: use panic() instead of directly calling /bin/sh

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Debian has a panic() function which makes it possible to disable shell
access in initramfs by setting the panic kernel parameter. Use it.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Kash Pande <kash@tripleback.net>
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Closes #8448
This commit is contained in:
Michael Niewöhner 2019-02-28 21:05:55 +01:00 committed by Brian Behlendorf
parent d6838ae649
commit 46164122c0
1 changed files with 22 additions and 8 deletions
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30
contrib/initramfs/scripts/zfs.in
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@ -16,6 +16,20 @@ ZPOOL="@sbindir@/zpool"
ZPOOL_CACHE="@sysconfdir@/zfs/zpool.cache"
export ZFS ZPOOL ZPOOL_CACHE
# Start interactive shell.
# Use debian's panic() if defined, because it allows to prevent shell access
# by setting panic in cmdline (e.g. panic=0 or panic=15).
# See "4.5 Disable root prompt on the initramfs" of Securing Debian Manual:
# https://www.debian.org/doc/manuals/securing-debian-howto/ch4.en.html
shell() {
if type panic > /dev/null 2>&1; then
panic $@
else
/bin/sh
fi
}
# This runs any scripts that should run before we start importing
# pools and mounting any filesystems.
pre_mountroot()
@ -256,7 +270,7 @@ import_pool()
echo ""
echo "Failed to import pool '$pool'."
echo "Manually import the pool and exit."
/bin/sh
shell
fi
fi
@ -379,7 +393,7 @@ mount_fs()
echo ""
echo "Failed to mount ${fs} on ${rootmnt}/${mountpoint}."
echo "Manually mount the filesystem and exit."
/bin/sh
shell
else
[ "$quiet" != "y" ] && zfs_log_end_msg
fi
@ -451,7 +465,7 @@ destroy_fs()
echo "Failed to destroy '$fs'. Please make sure that '$fs' is not available."
echo "Hint: Try: zfs destroy -Rfn $fs"
echo "If this dryrun looks good, then remove the 'n' from '-Rfn' and try again."
/bin/sh
shell
else
[ "$quiet" != "y" ] && zfs_log_end_msg
fi
@ -494,7 +508,7 @@ clone_snap()
echo "Failed to clone snapshot."
echo "Make sure that the any problems are corrected and then make sure"
echo "that the dataset '$destfs' exists and is bootable."
/bin/sh
shell
else
[ "$quiet" != "y" ] && zfs_log_end_msg
fi
@ -523,7 +537,7 @@ rollback_snap()
echo "Error: $ZFS_ERROR"
echo ""
echo "Failed to rollback snapshot."
/bin/sh
shell
else
[ "$quiet" != "y" ] && zfs_log_end_msg
fi
@ -684,7 +698,7 @@ mountroot()
echo ""
echo "Failed to load ZFS modules."
echo "Manually load the modules and exit."
/bin/sh
shell
fi
# ------------
@ -857,7 +871,7 @@ mountroot()
echo "No pool imported. Manually import the root pool"
echo "at the command prompt and then exit."
echo "Hint: Try: zpool import -R ${rootmnt} -N ${ZFS_RPOOL}"
/bin/sh
shell
fi
# In case the pool was specified as guid, resolve guid to name
@ -908,7 +922,7 @@ mountroot()
echo ""
echo "Manually mount the root filesystem on $rootmnt and then exit."
echo "Hint: Try: mount -o zfsutil -t zfs ${ZFS_RPOOL-rpool}/ROOT/system $rootmnt"
/bin/sh
shell
fi
# ----------------------------------------------------------------