Re: [PATCH pstore-next v2 2/4] pstore: Allocate compression during late_initcall()

From: Douglas Anderson
Date: Fri May 03 2019 - 14:38:36 EST


On Thu, Oct 18, 2018 at 11:56 AM Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> From: "Joel Fernandes (Google)" <joel@xxxxxxxxxxxxxxxxx>
> ramoops's call of pstore_register() was recently moved to run during
> late_initcall() because the crypto backend may not have been ready during
> postcore_initcall(). This meant early-boot crash dumps were not getting
> caught by pstore any more.
> Instead, lets allow calls to pstore_register() earlier, and once crypto
> is ready we can initialize the compression.
> Reported-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
> Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
> Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
> Fixes: cb3bee0369bc ("pstore: Use crypto compress API")
> [kees: trivial rebase]
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
> ---
> fs/pstore/platform.c | 10 +++++++++-
> fs/pstore/ram.c | 2 +-
> 2 files changed, 10 insertions(+), 2 deletions(-)

I'd propose that these three patches:

95047b0519c1 pstore: Refactor compression initialization
416031653eb5 pstore: Allocate compression during late_initcall()
cb095afd4476 pstore: Centralize init/exit routines

Get sent to linux-stable. Specifically I'll mention that 4.19 needs
it. IMO the regression of pstore not catching early boot crashes is
pretty serious IMO.