From: ard.biesheuvel@linaro.org (Ard Biesheuvel) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 05/30] ARM: head.S: use PC-relative insn sequence for secondary_data Date: Mon, 14 Aug 2017 13:53:46 +0100 [thread overview] Message-ID: <20170814125411.22604-6-ard.biesheuvel@linaro.org> (raw) In-Reply-To: <20170814125411.22604-1-ard.biesheuvel@linaro.org> Replace the open coded PC relative offset calculations with adr_l and ldr_l invocations. This ensures these quantities are invariant under runtime relocation. Cc: Russell King <linux@armlinux.org.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- arch/arm/kernel/head.S | 19 ++++--------------- 1 file changed, 4 insertions(+), 15 deletions(-) diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 0a98aec0e39d..6e9df3663a57 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -386,10 +386,8 @@ ENTRY(secondary_startup) /* * Use the page tables supplied from __cpu_up. */ - adr r4, __secondary_data - ldmia r4, {r5, r7, r12} @ address to jump to after - sub lr, r4, r5 @ mmu has been enabled - add r3, r7, lr + adr_l r3, secondary_data + mov_l r12, __secondary_switched ldrd r4, [r3, #0] @ get secondary_data.pgdir ARM_BE8(eor r4, r4, r5) @ Swap r5 and r4 in BE: ARM_BE8(eor r5, r4, r5) @ it can be done in 3 steps @@ -404,22 +402,13 @@ ARM_BE8(eor r4, r4, r5) @ without using a temp reg. ENDPROC(secondary_startup) ENDPROC(secondary_startup_arm) - /* - * r6 = &secondary_data - */ ENTRY(__secondary_switched) - ldr sp, [r7, #12] @ get secondary_data.stack + ldr_l r7, secondary_data + 12 @ get secondary_data.stack + mov sp, r7 mov fp, #0 b secondary_start_kernel ENDPROC(__secondary_switched) - .align - - .type __secondary_data, %object -__secondary_data: - .long . - .long secondary_data - .long __secondary_switched #endif /* defined(CONFIG_SMP) */ -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: Ard Biesheuvel <ard.biesheuvel@linaro.org> To: kernel-hardening@lists.openwall.com Cc: linux-arm-kernel@lists.infradead.org, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Arnd Bergmann <arnd@arndb.de>, Nicolas Pitre <nico@linaro.org>, Russell King <linux@armlinux.org.uk>, Kees Cook <keescook@chromium.org>, Thomas Garnier <thgarnie@google.com>, Marc Zyngier <marc.zyngier@arm.com>, Mark Rutland <mark.rutland@arm.com>, Tony Lindgren <tony@atomide.com>, Matt Fleming <matt@codeblueprint.co.uk>, Dave Martin <dave.martin@arm.com> Subject: [kernel-hardening] [PATCH 05/30] ARM: head.S: use PC-relative insn sequence for secondary_data Date: Mon, 14 Aug 2017 13:53:46 +0100 [thread overview] Message-ID: <20170814125411.22604-6-ard.biesheuvel@linaro.org> (raw) In-Reply-To: <20170814125411.22604-1-ard.biesheuvel@linaro.org> Replace the open coded PC relative offset calculations with adr_l and ldr_l invocations. This ensures these quantities are invariant under runtime relocation. Cc: Russell King <linux@armlinux.org.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- arch/arm/kernel/head.S | 19 ++++--------------- 1 file changed, 4 insertions(+), 15 deletions(-) diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 0a98aec0e39d..6e9df3663a57 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -386,10 +386,8 @@ ENTRY(secondary_startup) /* * Use the page tables supplied from __cpu_up. */ - adr r4, __secondary_data - ldmia r4, {r5, r7, r12} @ address to jump to after - sub lr, r4, r5 @ mmu has been enabled - add r3, r7, lr + adr_l r3, secondary_data + mov_l r12, __secondary_switched ldrd r4, [r3, #0] @ get secondary_data.pgdir ARM_BE8(eor r4, r4, r5) @ Swap r5 and r4 in BE: ARM_BE8(eor r5, r4, r5) @ it can be done in 3 steps @@ -404,22 +402,13 @@ ARM_BE8(eor r4, r4, r5) @ without using a temp reg. ENDPROC(secondary_startup) ENDPROC(secondary_startup_arm) - /* - * r6 = &secondary_data - */ ENTRY(__secondary_switched) - ldr sp, [r7, #12] @ get secondary_data.stack + ldr_l r7, secondary_data + 12 @ get secondary_data.stack + mov sp, r7 mov fp, #0 b secondary_start_kernel ENDPROC(__secondary_switched) - .align - - .type __secondary_data, %object -__secondary_data: - .long . - .long secondary_data - .long __secondary_switched #endif /* defined(CONFIG_SMP) */ -- 2.11.0
next prev parent reply other threads:[~2017-08-14 12:53 UTC|newest] Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-08-14 12:53 [PATCH 00/30] implement KASLR for ARM Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 01/30] asm-generic: add .data.rel.ro sections to __ro_after_init Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 14:26 ` Arnd Bergmann 2017-08-14 14:26 ` [kernel-hardening] " Arnd Bergmann 2017-08-14 12:53 ` [PATCH 02/30] ARM: assembler: introduce adr_l, ldr_l and str_l macros Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 15:29 ` Dave Martin 2017-08-14 15:29 ` [kernel-hardening] " Dave Martin 2017-08-14 15:38 ` Ard Biesheuvel 2017-08-14 15:38 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 15:50 ` Dave Martin 2017-08-14 15:50 ` [kernel-hardening] " Dave Martin 2017-08-14 16:18 ` Nicolas Pitre 2017-08-14 16:18 ` [kernel-hardening] " Nicolas Pitre 2017-08-14 16:22 ` Ard Biesheuvel 2017-08-14 16:22 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 16:33 ` Nicolas Pitre 2017-08-14 16:33 ` [kernel-hardening] " Nicolas Pitre 2017-08-14 16:42 ` Russell King - ARM Linux 2017-08-14 16:42 ` [kernel-hardening] " Russell King - ARM Linux 2017-08-14 16:56 ` Ard Biesheuvel 2017-08-14 16:56 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 15:32 ` Dave Martin 2017-08-14 15:32 ` [kernel-hardening] " Dave Martin 2017-08-14 15:40 ` Ard Biesheuvel 2017-08-14 15:40 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 15:53 ` Dave Martin 2017-08-14 15:53 ` [kernel-hardening] " Dave Martin 2017-08-14 12:53 ` [PATCH 03/30] ARM: head-common.S: use PC-relative insn sequence for __proc_info Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 04/30] ARM: head-common.S: use PC-relative insn sequence for idmap creation Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` Ard Biesheuvel [this message] 2017-08-14 12:53 ` [kernel-hardening] [PATCH 05/30] ARM: head.S: use PC-relative insn sequence for secondary_data Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 06/30] ARM: kernel: use relative references for UP/SMP alternatives Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 07/30] ARM: head: use PC-relative insn sequence for __smp_alt Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 08/30] ARM: sleep.S: use PC-relative insn sequence for sleep_save_sp/mpidr_hash Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 09/30] ARM: head.S: use PC-relative insn sequences for __fixup_pv_table Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 10/30] ARM: head.S: use PC relative insn sequence to calculate PHYS_OFFSET Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 11/30] ARM: kvm: replace open coded VA->PA calculations with adr_l call Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 12/30] arm-soc: exynos: replace open coded VA->PA conversions Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 13/30] arm-soc: mvebu: replace open coded VA->PA conversion Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 14/30] arm-soc: various: replace open coded VA->PA calculation of pen_release Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 15/30] ARM: kernel: switch to relative exception tables Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 16/30] ARM: kernel: use relative phys-to-virt patch tables Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:53 ` [PATCH 17/30] arm-soc: tegra: make sleep asm code runtime relocatable Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 14:42 ` Dave Martin 2017-08-14 14:42 ` [kernel-hardening] " Dave Martin 2017-08-14 14:49 ` Ard Biesheuvel 2017-08-14 14:49 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 15:29 ` Dave Martin 2017-08-14 15:29 ` [kernel-hardening] " Dave Martin 2017-08-14 12:53 ` [PATCH 18/30] ARM: kernel: make vmlinux buildable as a PIE executable Ard Biesheuvel 2017-08-14 12:53 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 19/30] ARM: kernel: use PC-relative symbol references in MMU switch code Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 20/30] ARM: kernel: use PC relative symbol references in suspend/resume code Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 16:02 ` Nicolas Pitre 2017-08-14 16:02 ` [kernel-hardening] " Nicolas Pitre 2017-08-14 18:14 ` Ard Biesheuvel 2017-08-14 18:14 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 18:37 ` Nicolas Pitre 2017-08-14 18:37 ` [kernel-hardening] " Nicolas Pitre 2017-08-14 12:54 ` [PATCH 21/30] ARM: mm: export default vmalloc base address Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 22/30] ARM: kernel: refer to swapper_pg_dir via its symbol Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 23/30] ARM: kernel: implement randomization of the kernel load address Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 24/30] ARM: decompressor: explicitly map decompressor binary cacheable Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 25/30] ARM: compressed: factor out zImage header and make it extensible Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 26/30] ARM: decompressor: add KASLR support Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 27/30] efi/libstub: add 'max' parameter to efi_random_alloc() Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 28/30] efi/libstub: check for vmalloc= command line argument Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 29/30] efi/libstub: arm: reserve bootloader supplied initrd in memory map Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-18 11:48 ` Ard Biesheuvel 2017-08-18 11:48 ` [kernel-hardening] " Ard Biesheuvel 2017-08-21 10:37 ` Mark Rutland 2017-08-21 10:37 ` [kernel-hardening] " Mark Rutland 2017-08-21 10:39 ` Ard Biesheuvel 2017-08-21 10:39 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 12:54 ` [PATCH 30/30] efi/libstub: arm: implement KASLR Ard Biesheuvel 2017-08-14 12:54 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 15:30 ` [PATCH 00/30] implement KASLR for ARM Arnd Bergmann 2017-08-14 15:30 ` [kernel-hardening] " Arnd Bergmann 2017-08-14 15:49 ` Ard Biesheuvel 2017-08-14 15:49 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 16:03 ` Arnd Bergmann 2017-08-14 16:03 ` [kernel-hardening] " Arnd Bergmann 2017-08-14 16:28 ` Nicolas Pitre 2017-08-14 16:28 ` [kernel-hardening] " Nicolas Pitre 2017-08-14 17:28 ` Ard Biesheuvel 2017-08-14 17:28 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 18:01 ` Nicolas Pitre 2017-08-14 18:01 ` [kernel-hardening] " Nicolas Pitre 2017-08-14 18:08 ` Ard Biesheuvel 2017-08-14 18:08 ` [kernel-hardening] " Ard Biesheuvel 2017-08-14 16:16 ` Nicolas Pitre 2017-08-14 16:16 ` [kernel-hardening] " Nicolas Pitre
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