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

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Message-Id: <48YT3K1BwNz9sRY@ozlabs.org>
Date:   Fri,  6 Mar 2020 11:27:40 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] powerpc/32: Warn and return ENOSYS on syscalls from kernel

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@....fr>

Series applied to powerpc next, thanks.

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

cheers