From patchwork Mon Aug 7 18:35:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Rutland X-Patchwork-Id: 9885971 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 66428603B4 for ; Mon, 7 Aug 2017 18:38:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5960324151 for ; Mon, 7 Aug 2017 18:38:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4AED1283AE; Mon, 7 Aug 2017 18:38:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 58FA624151 for ; Mon, 7 Aug 2017 18:38:54 +0000 (UTC) Received: (qmail 9703 invoked by uid 550); 7 Aug 2017 18:38:37 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 9545 invoked from network); 7 Aug 2017 18:38:35 -0000 From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Cc: ard.biesheuvel@linaro.org, catalin.marinas@arm.com, james.morse@arm.com, labbott@redhat.com, linux-kernel@vger.kernel.org, luto@amacapital.net, mark.rutland@arm.com, matt@codeblueprint.co.uk, will.deacon@arm.com, kernel-hardening@lists.openwall.com, keescook@chromium.org Date: Mon, 7 Aug 2017 19:35:57 +0100 Message-Id: <1502130965-18710-7-git-send-email-mark.rutland@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1502130965-18710-1-git-send-email-mark.rutland@arm.com> References: <1502130965-18710-1-git-send-email-mark.rutland@arm.com> Subject: [kernel-hardening] [PATCH 06/14] arm64: clean up irq stack definitions X-Virus-Scanned: ClamAV using ClamSMTP Before we add yet another stack to the kernel, it would be nice to ensure that we consistently organise stack definitions and related helper functions. This patch moves the basic IRQ stack defintions to to live with their task stack counterparts. Helpers used for unwinding are moved into , where subsequent patches will add helpers for other stacks. Includes are fixed up accordingly. This patch is a pure refactoring -- there should be no functional changes as a result of this patch. Signed-off-by: Mark Rutland Cc: Ard Biesheuvel Cc: Catalin Marinas Cc: James Morse Cc: Laura Abbott Cc: Will Deacon --- arch/arm64/include/asm/irq.h | 24 ------------------------ arch/arm64/include/asm/memory.h | 2 ++ arch/arm64/include/asm/stacktrace.h | 25 ++++++++++++++++++++++++- arch/arm64/kernel/ptrace.c | 1 + 4 files changed, 27 insertions(+), 25 deletions(-) diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h index 1ebe202..5e6f772 100644 --- a/arch/arm64/include/asm/irq.h +++ b/arch/arm64/include/asm/irq.h @@ -1,20 +1,12 @@ #ifndef __ASM_IRQ_H #define __ASM_IRQ_H -#define IRQ_STACK_SIZE THREAD_SIZE - #ifndef __ASSEMBLER__ -#include -#include - #include -#include struct pt_regs; -DECLARE_PER_CPU(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack); - extern void set_handle_irq(void (*handle_irq)(struct pt_regs *)); static inline int nr_legacy_irqs(void) @@ -22,21 +14,5 @@ static inline int nr_legacy_irqs(void) return 0; } -static inline bool on_irq_stack(unsigned long sp) -{ - unsigned long low = (unsigned long)raw_cpu_ptr(irq_stack); - unsigned long high = low + IRQ_STACK_SIZE; - - return (low <= sp && sp < high); -} - -static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp) -{ - unsigned long low = (unsigned long)task_stack_page(tsk); - unsigned long high = low + THREAD_SIZE; - - return (low <= sp && sp < high); -} - #endif /* !__ASSEMBLER__ */ #endif diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 8ab4774..1fc2453 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -110,6 +110,8 @@ #define THREAD_SIZE (UL(1) << THREAD_SHIFT) +#define IRQ_STACK_SIZE THREAD_SIZE + /* * Memory types available. */ diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h index 3bebab3..000e2418 100644 --- a/arch/arm64/include/asm/stacktrace.h +++ b/arch/arm64/include/asm/stacktrace.h @@ -16,7 +16,12 @@ #ifndef __ASM_STACKTRACE_H #define __ASM_STACKTRACE_H -struct task_struct; +#include +#include +#include + +#include +#include struct stackframe { unsigned long fp; @@ -31,4 +36,22 @@ extern void walk_stackframe(struct task_struct *tsk, struct stackframe *frame, int (*fn)(struct stackframe *, void *), void *data); extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk); +DECLARE_PER_CPU(unsigned long [IRQ_STACK_SIZE/sizeof(long)], irq_stack); + +static inline bool on_irq_stack(unsigned long sp) +{ + unsigned long low = (unsigned long)raw_cpu_ptr(irq_stack); + unsigned long high = low + IRQ_STACK_SIZE; + + return (low <= sp && sp < high); +} + +static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp) +{ + unsigned long low = (unsigned long)task_stack_page(tsk); + unsigned long high = low + THREAD_SIZE; + + return (low <= sp && sp < high); +} + #endif /* __ASM_STACKTRACE_H */ diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index baf0838..a9f8715 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include #include