From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: linux-arm-kernel@lists.infradead.org,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Jeremy Linton <jeremy.linton@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Enrico Weigelt <info@metux.net>, Ard Biesheuvel <ardb@kernel.org>,
Allison Randal <allison@lohutok.net>
Subject: Re: [PATCH v2] arm64: acpi: fix UBSAN warning
Date: Tue, 9 Jun 2020 18:46:54 +0100 [thread overview]
Message-ID: <20200609174654.GA2994@e121166-lin.cambridge.arm.com> (raw)
In-Reply-To: <20200608203818.189423-1-ndesaulniers@google.com>
On Mon, Jun 08, 2020 at 01:38:17PM -0700, Nick Desaulniers wrote:
> Will reported a UBSAN warning:
>
> UBSAN: null-ptr-deref in arch/arm64/kernel/smp.c:596:6
> member access within null pointer of type 'struct acpi_madt_generic_interrupt'
> CPU: 0 PID: 0 Comm: swapper Not tainted 5.7.0-rc6-00124-g96bc42ff0a82 #1
> Call trace:
> dump_backtrace+0x0/0x384
> show_stack+0x28/0x38
> dump_stack+0xec/0x174
> handle_null_ptr_deref+0x134/0x174
> __ubsan_handle_type_mismatch_v1+0x84/0xa4
> acpi_parse_gic_cpu_interface+0x60/0xe8
> acpi_parse_entries_array+0x288/0x498
> acpi_table_parse_entries_array+0x178/0x1b4
> acpi_table_parse_madt+0xa4/0x110
> acpi_parse_and_init_cpus+0x38/0x100
> smp_init_cpus+0x74/0x258
> setup_arch+0x350/0x3ec
> start_kernel+0x98/0x6f4
>
> This is from the use of the ACPI_OFFSET in
> arch/arm64/include/asm/acpi.h. Replace its use with offsetof from
> include/linux/stddef.h which should implement the same logic using
> __builtin_offsetof, so that UBSAN wont warn.
>
> Link: https://lore.kernel.org/lkml/20200521100952.GA5360@willie-the-truck/
> Cc: stable@vger.kernel.org
> Reported-by: Will Deacon <will@kernel.org>
> Suggested-by: Ard Biesheuvel <ardb@kernel.org>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> Changes V1 -> V2:
> * Just fix one of the two warnings, specific to arm64.
> * Put warning in commit message.
>
> arch/arm64/include/asm/acpi.h | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index b263e239cb59..a45366c3909b 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -12,6 +12,7 @@
> #include <linux/efi.h>
> #include <linux/memblock.h>
> #include <linux/psci.h>
> +#include <linux/stddef.h>
>
> #include <asm/cputype.h>
> #include <asm/io.h>
> @@ -31,14 +32,14 @@
> * is therefore used to delimit the MADT GICC structure minimum length
> * appropriately.
> */
> -#define ACPI_MADT_GICC_MIN_LENGTH ACPI_OFFSET( \
> +#define ACPI_MADT_GICC_MIN_LENGTH offsetof( \
> struct acpi_madt_generic_interrupt, efficiency_class)
>
> #define BAD_MADT_GICC_ENTRY(entry, end) \
> (!(entry) || (entry)->header.length < ACPI_MADT_GICC_MIN_LENGTH || \
> (unsigned long)(entry) + (entry)->header.length > (end))
>
> -#define ACPI_MADT_GICC_SPE (ACPI_OFFSET(struct acpi_madt_generic_interrupt, \
> +#define ACPI_MADT_GICC_SPE (offsetof(struct acpi_madt_generic_interrupt, \
> spe_interrupt) + sizeof(u16))
>
> /* Basic configuration for ACPI */
> --
> 2.27.0.278.ge193c7cf3a9-goog
>
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next prev parent reply other threads:[~2020-06-09 17:47 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 10:09 arm64/acpi: NULL dereference reports from UBSAN at boot Will Deacon
2020-05-21 17:37 ` Lorenzo Pieralisi
2020-05-26 20:21 ` Will Deacon
2020-05-27 13:41 ` Lorenzo Pieralisi
2020-06-01 7:05 ` Will Deacon
2020-06-01 21:51 ` Nick Desaulniers
2020-06-01 21:57 ` Ard Biesheuvel
2020-06-01 22:19 ` Nick Desaulniers
2020-06-01 22:28 ` Ard Biesheuvel
2020-06-01 23:18 ` [PATCH] ACPICA: fix UBSAN warning using __builtin_offsetof Nick Desaulniers
2020-06-01 23:37 ` Peter Collingbourne
2020-06-01 23:48 ` Nick Desaulniers
2020-06-02 0:02 ` Kaneda, Erik
2020-06-02 18:46 ` Nick Desaulniers
2020-06-08 14:51 ` Will Deacon
2020-06-08 20:29 ` Nick Desaulniers
2020-06-08 20:38 ` [PATCH v2] arm64: acpi: fix UBSAN warning Nick Desaulniers
2020-06-09 17:46 ` Lorenzo Pieralisi [this message]
2020-06-09 19:50 ` Jeremy Linton
2020-06-10 11:21 ` Will Deacon
2020-06-08 23:20 ` [PATCH] ACPICA: fix UBSAN warning using __builtin_offsetof Kaneda, Erik
2020-06-10 23:06 ` Kaneda, Erik
2020-06-10 23:29 ` Nick Desaulniers
2020-06-10 23:46 ` Jung-uk Kim
2020-06-11 16:45 ` [Devel] " Kaneda, Erik
2020-06-11 17:06 ` Nick Desaulniers
2020-06-16 21:39 ` Kaneda, Erik
2020-06-10 23:31 ` Jung-uk Kim
2020-05-22 8:07 ` arm64/acpi: NULL dereference reports from UBSAN at boot Hanjun Guo
2020-05-22 9:43 ` Hanjun Guo
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