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Date: Mon, 20 Apr 2020 18:17:55 +0100
From: Will Deacon <will@...nel.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Catalin Marinas <catalin.marinas@....com>,
James Morse <james.morse@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Mark Rutland <mark.rutland@....com>,
Masahiro Yamada <masahiroy@...nel.org>,
Michal Marek <michal.lkml@...kovi.net>,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Juri Lelli <juri.lelli@...hat.com>,
Vincent Guittot <vincent.guittot@...aro.org>,
Dave Martin <Dave.Martin@....com>,
Kees Cook <keescook@...omium.org>,
Laura Abbott <labbott@...hat.com>, Marc Zyngier <maz@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Jann Horn <jannh@...gle.com>,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
clang-built-linux@...glegroups.com,
kernel-hardening@...ts.openwall.com,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 02/12] scs: add accounting
On Thu, Apr 16, 2020 at 09:12:35AM -0700, Sami Tolvanen wrote:
> This change adds accounting for the memory allocated for shadow stacks.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> ---
> drivers/base/node.c | 6 ++++++
> fs/proc/meminfo.c | 4 ++++
> include/linux/mmzone.h | 3 +++
> kernel/scs.c | 20 ++++++++++++++++++++
> mm/page_alloc.c | 6 ++++++
> mm/vmstat.c | 3 +++
> 6 files changed, 42 insertions(+)
>
> diff --git a/drivers/base/node.c b/drivers/base/node.c
> index 10d7e818e118..502ab5447c8d 100644
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -415,6 +415,9 @@ static ssize_t node_read_meminfo(struct device *dev,
> "Node %d AnonPages: %8lu kB\n"
> "Node %d Shmem: %8lu kB\n"
> "Node %d KernelStack: %8lu kB\n"
> +#ifdef CONFIG_SHADOW_CALL_STACK
> + "Node %d ShadowCallStack:%8lu kB\n"
> +#endif
> "Node %d PageTables: %8lu kB\n"
> "Node %d NFS_Unstable: %8lu kB\n"
> "Node %d Bounce: %8lu kB\n"
> @@ -438,6 +441,9 @@ static ssize_t node_read_meminfo(struct device *dev,
> nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
> nid, K(i.sharedram),
> nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB),
> +#ifdef CONFIG_SHADOW_CALL_STACK
> + nid, sum_zone_node_page_state(nid, NR_KERNEL_SCS_BYTES) / 1024,
> +#endif
Why not just use KB everywhere instead of repeated division by 1024?
Will
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