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From: Borislav Petkov <bp@alien8.de>
To: Guenter Roeck <linux@roeck-us.net>
Cc: fanc.fnst@cn.fujitsu.com, tglx@linutronix.de,
	linux-kernel@vger.kernel.org, kirill.shutemov@linux.intel.com,
	mingo@redhat.com, thomas.lendacky@amd.com,
	yamada.masahiro@socionext.com, caoj.fnst@cn.fujitsu.com,
	jgross@suse.com, mingo@kernel.org, keescook@chromium.org,
	x86@kernel.org, hpa@zytor.com, linux-tip-commits@vger.kernel.org,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Matt Fleming <matt@codeblueprint.co.uk>
Subject: Re: [tip:x86/boot] x86/boot: Early parse RSDP and save it in boot_params
Date: Mon, 11 Feb 2019 01:22:20 +0100	[thread overview]
Message-ID: <20190211002220.GD14948@zn.tnic> (raw)
In-Reply-To: <20190208215322.GO674@zn.tnic>

On Fri, Feb 08, 2019 at 10:53:22PM +0100, Borislav Petkov wrote:
> On Fri, Feb 08, 2019 at 12:44:51PM -0800, Guenter Roeck wrote:
> > Yes, the kernel boots if I comment out that function and have it return 0.
> 
> Thanks, this localizes the issue significantly.

Some observations:

                } else {
                        efi_config_table_32_t *tmp_table;

                        tmp_table = config_tables;
                        guid = tmp_table->guid;			<--- *
                        table = tmp_table->table;
                }

It blows up at that tmp_table->guid deref above. Singlestepping through
it with gdb shows:

# arch/x86/boot/compressed/acpi.c:114: 			guid = tmp_table->guid;
	movq	(%rdi), %rax	# MEM[(struct efi_config_table_32_t *)config_tables_37].guid, guid
	movq	8(%rdi), %rsi	# MEM[(struct efi_config_table_32_t *)config_tables_37].guid, guid
# arch/x86/boot/compressed/acpi.c:115: 			table = tmp_table->table;
	movl	16(%rdi), %r10d	# MEM[(struct efi_config_table_32_t *)config_tables_37].table, table
	jmp	.L30	#

and %rdi has:

	rdi            0x630646870

which is an address above 4G but we're using a 32-bit EFI BIOS.

Which begs the question whether EFI system tables can even be mapped at
something above 4G with a 32-bit EFI and whether that could work ok.
Hmm.

Lemme add Ard and mfleming for insight here.

Thx.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

  reply	other threads:[~2019-02-11  0:22 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-23 11:08 [PATCH v16 0/7] Parse ACPI table and limit KASLR to choosing immovable memory Chao Fan
2019-01-23 11:08 ` [PATCH v16 1/7] x86/boot: Copy kstrtoull() to boot/string.c instead of simple_strtoull() Chao Fan
2019-02-01 10:58   ` [tip:x86/boot] x86/boot: Copy kstrtoull() to boot/string.c tip-bot for Chao Fan
2019-01-23 11:08 ` [PATCH v16 2/7] x86/boot: Introduce get_acpi_rsdp() to parse RSDP in cmdline from KEXEC Chao Fan
2019-02-01 10:59   ` [tip:x86/boot] x86/boot: Add "acpi_rsdp=" early parsing tip-bot for Chao Fan
2019-01-23 11:08 ` [PATCH v16 3/7] x86/boot: Introduce efi_get_rsdp_addr() to find RSDP from EFI table Chao Fan
2019-02-01 10:59   ` [tip:x86/boot] x86/boot: Search for RSDP in the EFI tables tip-bot for Chao Fan
2019-01-23 11:08 ` [PATCH v16 4/7] x86/boot: Introduce bios_get_rsdp_addr() to search RSDP in memory Chao Fan
2019-02-01 11:00   ` [tip:x86/boot] x86/boot: Search for " tip-bot for Chao Fan
2019-01-23 11:08 ` [PATCH v16 5/7] x86/boot: Early parse RSDP and fill in boot_params Chao Fan
2019-01-23 11:17   ` Chao Fan
2019-02-01 11:01   ` [tip:x86/boot] x86/boot: Early parse RSDP and save it " tip-bot for Chao Fan
2019-02-08 19:02     ` Guenter Roeck
2019-02-08 19:10       ` Borislav Petkov
2019-02-08 20:44         ` Guenter Roeck
2019-02-08 21:53           ` Borislav Petkov
2019-02-11  0:22             ` Borislav Petkov [this message]
2019-02-11  1:33               ` Chao Fan
2019-02-11  9:46               ` Ard Biesheuvel
2019-02-11  9:55                 ` Chao Fan
2019-02-11  9:57                   ` Ard Biesheuvel
2019-02-11 10:10                     ` Chao Fan
2019-02-11 10:17                       ` Ard Biesheuvel
2019-02-11 10:24                         ` Borislav Petkov
2019-02-11 10:33                           ` Ard Biesheuvel
2019-02-11 10:42                           ` Borislav Petkov
2019-02-11 10:46                             ` Ard Biesheuvel
2019-02-11 11:04                               ` Borislav Petkov
2019-02-11 11:55                                 ` Ard Biesheuvel
2019-02-11 12:16                                   ` Borislav Petkov
2019-02-11 11:20                               ` Borislav Petkov
2019-02-11 13:21                                 ` Chao Fan
2019-02-13  1:54                                 ` Chao Fan
2019-02-13  7:36                                   ` Boris Petkov
2019-02-13  7:58                                     ` Chao Fan
2019-02-13  8:01                                       ` Ard Biesheuvel
2019-02-13  8:12                                         ` Chao Fan
2019-02-13  8:50                                           ` Borislav Petkov
2019-02-13  8:57                                             ` Chao Fan
2019-02-11  1:07         ` Chao Fan
2019-02-11  9:30       ` Chao Fan
2019-02-11 10:08         ` Borislav Petkov
2019-02-11 13:03           ` Chao Fan
2019-02-11 14:08           ` Guenter Roeck
2019-02-13  9:06       ` [tip:x86/boot] x86/boot: Correct RSDP parsing with 32-bit EFI tip-bot for Borislav Petkov
2019-02-13 11:27       ` tip-bot for Borislav Petkov
2019-01-23 11:08 ` [PATCH v16 6/7] x86/boot: Parse SRAT address from RSDP and store immovable memory Chao Fan
2019-02-01 11:01   ` [tip:x86/boot] x86/boot: Parse SRAT table and count immovable memory regions tip-bot for Chao Fan
2019-01-23 11:08 ` [PATCH v16 7/7] x86/boot/KASLR: Limit KASLR to extracting kernel in immovable memory Chao Fan
2019-02-01 11:02   ` [tip:x86/boot] x86/boot/KASLR: Limit KASLR to extract the kernel in immovable memory only tip-bot for Chao Fan
2019-01-28 17:51 ` [PATCH v16 0/7] Parse ACPI table and limit KASLR to choosing immovable memory Borislav Petkov
2019-01-30  5:58   ` Chao Fan
2019-01-30 11:22     ` [PATCH] x86/boot: Build the command line parsing code unconditionally (was: Re: [PATCH v16 0/7] Parse ACPI table and limit KASLR to choosing immovable memory) Borislav Petkov
2019-02-01 10:57       ` [tip:x86/boot] x86/boot: Build the command line parsing code unconditionally tip-bot for Borislav Petkov

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