From: Catalin Marinas <catalin.marinas@arm.com>
To: Amit Daniel Kachhap <amit.kachhap@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Kees Cook <keescook@chromium.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Richard Henderson <richard.henderson@linaro.org>,
Kristina Martsenko <kristina.martsenko@arm.com>,
James Morse <james.morse@arm.com>,
Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>,
Mark Brown <Mark.Brown@arm.com>,
Vincenzo Frascino <Vincenzo.Frascino@arm.com>,
Will Deacon <will@kernel.org>, Dave Martin <Dave.Martin@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 16/16] lkdtm: arm64: test kernel pointer authentication
Date: Fri, 17 Jan 2020 11:53:30 +0000 [thread overview]
Message-ID: <20200117115330.GH26090@arrakis.emea.arm.com> (raw)
In-Reply-To: <1576486038-9899-17-git-send-email-amit.kachhap@arm.com>
On Mon, Dec 16, 2019 at 02:17:18PM +0530, Amit Daniel Kachhap wrote:
> This test is specific for arm64. When in-kernel Pointer Authentication
> config is enabled, the return address stored in the stack is signed.
> This feature helps in ROP kind of attack. If any parameters used to
> generate the pac (<key, sp, lr>) is modified then this will fail in
> the authentication stage and will lead to abort.
>
> This test changes the input parameter APIA kernel keys to cause abort.
> The pac computed from the new key can be same as last due to hash
> collision so this is retried for few times as there is no reliable way
> to compare the pacs. Even though this test may fail even after retries
> but this may cause authentication failure at a later stage in earlier
> function returns.
>
> This test can be invoked as,
> echo CORRUPT_PAC > /sys/kernel/debug/provoke-crash/DIRECT
>
> or as below if inserted as a module,
> insmod lkdtm.ko cpoint_name=DIRECT cpoint_type=CORRUPT_PAC cpoint_count=1
>
> [ 13.118166] lkdtm: Performing direct entry CORRUPT_PAC
> [ 13.118298] lkdtm: Clearing PAC from the return address
> [ 13.118466] Unable to handle kernel paging request at virtual address bfff8000108648ec
> [ 13.118626] Mem abort info:
> [ 13.118666] ESR = 0x86000004
> [ 13.118866] EC = 0x21: IABT (current EL), IL = 32 bits
> [ 13.118966] SET = 0, FnV = 0
> [ 13.119117] EA = 0, S1PTW = 0
>
> Cc: Kees Cook <keescook@chromium.org>
> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
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next prev parent reply other threads:[~2020-01-17 11:53 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-16 8:47 [PATCH v3 00/16] arm64: return address signing Amit Daniel Kachhap
2019-12-16 8:47 ` [PATCH v3 01/16] arm64: cpufeature: add pointer auth meta-capabilities Amit Daniel Kachhap
2020-01-15 12:26 ` Catalin Marinas
2020-01-15 13:52 ` Suzuki Kuruppassery Poulose
2020-01-15 16:01 ` Catalin Marinas
2020-01-16 12:35 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 02/16] arm64: rename ptrauth key structures to be user-specific Amit Daniel Kachhap
2020-01-15 16:42 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 03/16] arm64: install user ptrauth keys at kernel exit time Amit Daniel Kachhap
2020-01-15 17:02 ` Catalin Marinas
2020-01-16 12:39 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 04/16] arm64: create macro to park cpu in an infinite loop Amit Daniel Kachhap
2020-01-07 11:13 ` Suzuki Kuruppassery Poulose
2020-01-15 17:03 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 05/16] arm64: ptrauth: Add bootup/runtime flags for __cpu_setup Amit Daniel Kachhap
2020-01-07 11:18 ` Suzuki Kuruppassery Poulose
2020-01-09 8:33 ` Amit Kachhap
2020-01-15 17:30 ` Catalin Marinas
2020-01-16 12:40 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 06/16] arm64: enable ptrauth earlier Amit Daniel Kachhap
2020-01-07 11:35 ` Suzuki Kuruppassery Poulose
2020-01-09 8:29 ` Amit Kachhap
2020-01-10 10:18 ` Suzuki Kuruppassery Poulose
2020-01-16 16:24 ` Catalin Marinas
2020-01-17 10:43 ` Amit Kachhap
2020-01-17 12:00 ` Catalin Marinas
2020-01-20 14:27 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 07/16] arm64: initialize and switch ptrauth kernel keys Amit Daniel Kachhap
2020-01-16 18:00 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 08/16] arm64: initialize ptrauth keys for kernel booting task Amit Daniel Kachhap
2020-01-16 17:59 ` Catalin Marinas
2020-01-20 10:50 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 09/16] arm64: mask PAC bits of __builtin_return_address Amit Daniel Kachhap
2020-01-17 10:14 ` Catalin Marinas
2020-01-20 14:20 ` Amit Kachhap
2020-01-21 16:52 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 10/16] arm64: unwind: strip PAC from kernel addresses Amit Daniel Kachhap
2020-01-17 10:22 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 11/16] arm64: __show_regs: strip PAC from lr in printk Amit Daniel Kachhap
2020-01-17 10:25 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 12/16] arm64: suspend: restore the kernel ptrauth keys Amit Daniel Kachhap
2020-01-17 10:31 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 13/16] arm64: kprobe: disable probe of ptrauth instruction Amit Daniel Kachhap
2020-01-17 11:16 ` Catalin Marinas
2020-01-20 14:24 ` Amit Kachhap
2019-12-16 8:47 ` [PATCH v3 14/16] kconfig: Add support for 'as-option' Amit Daniel Kachhap
2019-12-17 11:43 ` Masahiro Yamada
2020-01-17 11:33 ` Catalin Marinas
2020-01-17 17:51 ` Masahiro Yamada
2020-01-20 10:26 ` Vincenzo Frascino
2019-12-16 8:47 ` [PATCH v3 15/16] arm64: compile the kernel with ptrauth return address signing Amit Daniel Kachhap
2020-01-17 11:49 ` Catalin Marinas
2020-01-21 14:37 ` Amit Kachhap
2020-01-21 14:46 ` Vincenzo Frascino
2020-01-21 16:50 ` Catalin Marinas
2019-12-16 8:47 ` [PATCH v3 16/16] lkdtm: arm64: test kernel pointer authentication Amit Daniel Kachhap
2020-01-17 11:53 ` Catalin Marinas [this message]
2019-12-16 9:35 ` [RESEND PATCH v3 00/16] arm64: return address signing Amit Daniel Kachhap
2019-12-30 19:09 ` [PATCH " Kees Cook
2020-01-07 11:07 ` Amit Kachhap
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