[PATCHv3 12/19] arm64: zero GPRs upon entry from EL0

[PATCHv3 00/19] arm64: invoke syscalls with pt_regs · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
[PATCHv3 01/19] arm64: consistently use unsigned long for thread flags · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 01/19] arm64: consistently use unsigned long for thread flags · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 01/19] arm64: consistently use unsigned long for thread flags · Mark Rutland <mark.rutland@arm.com> · 2018-06-19
[PATCHv3 02/19] arm64: move SCTLR_EL{1,2} assertions to <asm/sysreg.h> · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 02/19] arm64: move SCTLR_EL{1, 2} assertions to <asm/sysreg.h> · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 02/19] arm64: move SCTLR_EL{1,2} assertions to <asm/sysreg.h> · Mark Rutland <mark.rutland@arm.com> · 2018-06-19
[PATCHv3 03/19] arm64: introduce sysreg_clear_set() · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 03/19] arm64: introduce sysreg_clear_set() · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 03/19] arm64: introduce sysreg_clear_set() · Marc Zyngier <hidden> · 2018-06-19
[PATCHv3 04/19] arm64: kill config_sctlr_el1() · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 04/19] arm64: kill config_sctlr_el1() · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 05/19] arm64: kill change_cpacr() · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 05/19] arm64: kill change_cpacr() · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 06/19] arm64: move sve_user_{enable,disable} to <asm/fpsimd.h> · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 06/19] arm64: move sve_user_{enable, disable} to <asm/fpsimd.h> · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 06/19] arm64: move sve_user_{enable, disable} to <asm/fpsimd.h> · Dave Martin <Dave.Martin@arm.com> · 2018-06-19
[PATCHv3 07/19] arm64: remove sigreturn wrappers · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 07/19] arm64: remove sigreturn wrappers · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 08/19] arm64: convert raw syscall invocation to C · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 08/19] arm64: convert raw syscall invocation to C · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 08/19] arm64: convert raw syscall invocation to C · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 08/19] arm64: convert raw syscall invocation to C · Mark Rutland <mark.rutland@arm.com> · 2018-06-19
Re: [PATCHv3 08/19] arm64: convert raw syscall invocation to C · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 08/19] arm64: convert raw syscall invocation to C · Mark Rutland <mark.rutland@arm.com> · 2018-06-19
[PATCHv3 09/19] arm64: convert syscall trace logic to C · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 09/19] arm64: convert syscall trace logic to C · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 09/19] arm64: convert syscall trace logic to C · Mark Rutland <mark.rutland@arm.com> · 2018-06-19
[PATCHv3 10/19] arm64: convert native/compat syscall entry to C · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 10/19] arm64: convert native/compat syscall entry to C · Dave Martin <Dave.Martin@arm.com> · 2018-06-19
Re: [PATCHv3 10/19] arm64: convert native/compat syscall entry to C · Mark Rutland <mark.rutland@arm.com> · 2018-06-19
Re: [PATCHv3 10/19] arm64: convert native/compat syscall entry to C · Dave Martin <Dave.Martin@arm.com> · 2018-06-20
Re: [PATCHv3 10/19] arm64: convert native/compat syscall entry to C · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 11/19] arm64: don't reload GPRs after apply_ssbd · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 11/19] arm64: don't reload GPRs after apply_ssbd · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 12/19] arm64: zero GPRs upon entry from EL0 · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 12/19] arm64: zero GPRs upon entry from EL0 · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 13/19] kernel: add ksys_personality() · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 13/19] kernel: add ksys_personality() · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 13/19] kernel: add ksys_personality() · Mark Rutland <mark.rutland@arm.com> · 2018-06-19
[PATCHv3 14/19] kernel: add kcompat_sys_{f,}statfs64() · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
[PATCHv3 15/19] arm64: remove in-kernel call to sys_personality() · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 15/19] arm64: remove in-kernel call to sys_personality() · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 16/19] arm64: use {COMPAT,}SYSCALL_DEFINE0 for sigreturn · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 16/19] arm64: use {COMPAT,}SYSCALL_DEFINE0 for sigreturn · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 17/19] arm64: use SYSCALL_DEFINE6() for mmap · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 17/19] arm64: use SYSCALL_DEFINE6() for mmap · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 18/19] arm64: convert compat wrappers to C · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 18/19] arm64: convert compat wrappers to C · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
[PATCHv3 19/19] arm64: implement syscall wrappers · Mark Rutland <mark.rutland@arm.com> · 2018-06-18
Re: [PATCHv3 19/19] arm64: implement syscall wrappers · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19
Re: [PATCHv3 00/19] arm64: invoke syscalls with pt_regs · Mark Rutland <mark.rutland@arm.com> · 2018-06-19
Re: [PATCHv3 00/19] arm64: invoke syscalls with pt_regs · Catalin Marinas <catalin.marinas@arm.com> · 2018-06-19

From: catalin.marinas@arm.com (Catalin Marinas)
Date: 2018-06-19 15:24:41
Also in: linux-fsdevel

On Mon, Jun 18, 2018 at 01:03:03PM +0100, Mark Rutland wrote:

We can zero GPRs x0 - x29 upon entry from EL0 to make it harder for
userspace to control values consumed by speculative gadgets.

We don't blat x30, since this is stashed much later, and we'll blat it
before invoking C code.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <redacted>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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