linux/arch/arm64/kernel/scs.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Shadow Call Stack support.
 *
 * Copyright (C) 2019 Google LLC
 */

#include <linux/percpu.h>
#include <linux/scs.h>

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
arm64: Implement Shadow Call Stack This change implements shadow stack switching, initial SCS set-up, and interrupt shadow stacks for arm64. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Will Deacon <will@kernel.org> 2020-04-27 16:00:16 +00:00			`// SPDX-License-Identifier: GPL-2.0`
			`/*`
			`* Shadow Call Stack support.`
			`*`
			`* Copyright (C) 2019 Google LLC`
			`*/`

			`#include <linux/percpu.h>`
scs: Move scs_overflow_check() out of architecture code There is nothing architecture-specific about scs_overflow_check() as it's just a trivial wrapper around scs_corrupted(). For parity with task_stack_end_corrupted(), rename scs_corrupted() to task_scs_end_corrupted() and call it from schedule_debug() when CONFIG_SCHED_STACK_END_CHECK_is enabled, which better reflects its purpose as a debug feature to catch inadvertent overflow of the SCS. Finally, remove the unused scs_overflow_check() function entirely. This has absolutely no impact on architectures that do not support SCS (currently arm64 only). Tested-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will@kernel.org> 2020-05-15 13:56:05 +00:00			`#include <linux/scs.h>`
arm64: Implement Shadow Call Stack This change implements shadow stack switching, initial SCS set-up, and interrupt shadow stacks for arm64. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Will Deacon <will@kernel.org> 2020-04-27 16:00:16 +00:00
			`DEFINE_SCS(irq_shadow_call_stack);`
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@google.com> Reviewed-by: James Morse <james.morse@arm.com> Tested-by: James Morse <james.morse@arm.com> Signed-off-by: Will Deacon <will@kernel.org> 2020-04-27 16:00:17 +00:00
			`#ifdef CONFIG_ARM_SDE_INTERFACE`
			`DEFINE_SCS(sdei_shadow_call_stack_normal);`
			`DEFINE_SCS(sdei_shadow_call_stack_critical);`
			`#endif`