On Mon, Dec 16, 2019 at 11:22:04AM +0100, Arnd Bergmann wrote:
On Mon, Dec 16, 2019 at 10:15 AM Naresh Kamboju naresh.kamboju@linaro.org wrote:
The following kernel crash reported on qemu_x86_64 boot running 5.5.0-rc1 mainline kernel.
I looked for too long at v5.5-rc1 completely puzzled by how you got to this object code before realizing that this is a git snapshot between -rc1 and -rc2.
The code in question was changed by a recent series from Dominik Brodowski, the main difference being commit cccaa5e33525 ("init: use do_mount() instead of ksys_mount()").
It looks like the NULL-check in ksys_mount()/copy_mount_options() is missing from the new mount_block_root, so it passes a NULL pointer into strncpy().
Something like this should fix it (not tested):
This equivalent patch by Linus already got some testing:
https://lore.kernel.org/lkml/CAHk-=wh8VLe3AEKhz=1bzSO=1fv4EM71EhufxuC=Gp=+bL...
Thanks, Dominik