[PATCH v3 1/2] powerpc/32: Warn and return ENOSYS on syscalls from kernel

[Michael Ellerman]

On Fri, 2020-01-31 at 11:34:54 UTC, Christophe Leroy wrote:
> Since commit b86fb88855ea ("powerpc/32: implement fast entry for
> syscalls on non BOOKE") and commit 1a4b739bbb4f ("powerpc/32:
> implement fast entry for syscalls on BOOKE"), syscalls from
> kernel are unexpected and can have catastrophic consequences
> as it will destroy the kernel stack.
> 
> Test MSR_PR on syscall entry. In case syscall is from kernel,
> emit a warning and return ENOSYS error.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/9e27086292aa880921a0f2b8501e5189d5efcf03

cheers