Messages in this thread | | | Date | Mon, 30 Aug 2021 18:55:41 +0200 | From | Thomas Petazzoni <> | Subject | Re: Kernel 4.14: Using dm-verity with squashfs rootfs - mounting issue |
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Hello,
On Mon, 30 Aug 2021 21:55:19 +0530 Pintu Agarwal <pintu.ping@gmail.com> wrote:
> Sorry for coming back to this again.. > Unfortunately, none of the options is working for us with squashfs > (bootloader, initramfs). > initramfs have different kinds of challenges because of the partition > size issue. > So, our preferred option is still the bootloader command line approach.. > > Is there a proven and working solution of dm-verity with squashfs ? > If yes, please share some references. > > The current problem with squashfs is that we could not append the > verity-metadata to squashfs, so we store it on a separate volume and > access it.
Here, it definitely worked to append the hash tree to the squashfs image and store them in the same partition.
> By specifying it like : /dev/mtdblock53 > > Then we get the error like this: > { > [ 4.950276] device-mapper: init: attempting early device configuration. > [ 4.957577] device-mapper: init: adding target '0 95384 verity 1 > /dev/ubiblock0_0 /dev/mtdblock53 4096 4096 11923 8 sha256 > 16da5e4bbc706e5d90511d2a3dae373b5d878f9aebd522cd614a4faaace6baa3 > aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 10 > restart_on_corruption ignore_zero_blocks use_fec_from_device > /dev/mtdblock53 fec_roots 2 fec_blocks 12026 fec_start 12026' > [ 4.975283] device-mapper: verity: sha256 using implementation > "sha256-generic" > [ 4.998728] device-mapper: init: dm-0 is ready
Could you show the full kernel command line ?
> Do you see any other problem here with dm-verity cmdline or with squashfs ? > > Is squashfs ever proved to be working with dm-verity on higher kernel version ? > Currently our kernel version is 4.14.
I confirm we used squashfs on dm-verity successfully. For sure on 4.19, perhaps on older kernels as well.
> Or, another option is to use the new concept from 5.1 kernel that is: > dm-mod.create = ?
How are you doing it today without dm-mod.create ?
Again, please give your complete kernel command line.
Best regards,
Thomas -- Thomas Petazzoni, co-owner and CEO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
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