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Message-Id: <20200421021453.198187-12-samitolvanen@google.com>
Date: Mon, 20 Apr 2020 19:14:52 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Will Deacon <will@...nel.org>, 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>
Cc: 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,
Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v12 11/12] arm64: scs: add shadow stacks for SDEI
This change adds per-CPU shadow call stacks for the SDEI handler.
Similarly to how the kernel stacks are handled, we add separate shadow
stacks for normal and critical events.
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
Reviewed-by: James Morse <james.morse@....com>
Tested-by: James Morse <james.morse@....com>
---
arch/arm64/kernel/entry.S | 14 +++++++++++++-
arch/arm64/kernel/scs.c | 5 +++++
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 14f0ff763b39..9f7be489d26d 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -1058,13 +1058,16 @@ SYM_CODE_START(__sdei_asm_handler)
mov x19, x1
+#if defined(CONFIG_VMAP_STACK) || defined(CONFIG_SHADOW_CALL_STACK)
+ ldrb w4, [x19, #SDEI_EVENT_PRIORITY]
+#endif
+
#ifdef CONFIG_VMAP_STACK
/*
* entry.S may have been using sp as a scratch register, find whether
* this is a normal or critical event and switch to the appropriate
* stack for this CPU.
*/
- ldrb w4, [x19, #SDEI_EVENT_PRIORITY]
cbnz w4, 1f
ldr_this_cpu dst=x5, sym=sdei_stack_normal_ptr, tmp=x6
b 2f
@@ -1074,6 +1077,15 @@ SYM_CODE_START(__sdei_asm_handler)
mov sp, x5
#endif
+#ifdef CONFIG_SHADOW_CALL_STACK
+ /* Use a separate shadow call stack for normal and critical events */
+ cbnz w4, 3f
+ adr_this_cpu dst=x18, sym=sdei_shadow_call_stack_normal, tmp=x6
+ b 4f
+3: adr_this_cpu dst=x18, sym=sdei_shadow_call_stack_critical, tmp=x6
+4:
+#endif
+
/*
* We may have interrupted userspace, or a guest, or exit-from or
* return-to either of these. We can't trust sp_el0, restore it.
diff --git a/arch/arm64/kernel/scs.c b/arch/arm64/kernel/scs.c
index 086ad97bba86..656262736eca 100644
--- a/arch/arm64/kernel/scs.c
+++ b/arch/arm64/kernel/scs.c
@@ -14,3 +14,8 @@
__aligned(SCS_SIZE)
DEFINE_SCS(irq_shadow_call_stack);
+
+#ifdef CONFIG_ARM_SDE_INTERFACE
+DEFINE_SCS(sdei_shadow_call_stack_normal);
+DEFINE_SCS(sdei_shadow_call_stack_critical);
+#endif
--
2.26.1.301.g55bc3eb7cb9-goog
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