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From: Jiri Kosina <jkosina@suse.cz>
To: Borislav Petkov <bp@suse.de>
Cc: Yinghai Lu <yinghai@kernel.org>,
	Matt Fleming <matt.fleming@intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	Kees Cook <keescook@chromium.org>, Baoquan He <bhe@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org
Subject: Re: [PATCH v3 2/7] x86, boot: Move ZO to end of buffer
Date: Tue, 10 Mar 2015 10:34:31 +0100 (CET)	[thread overview]
Message-ID: <alpine.LNX.2.00.1503101032560.26925@pobox.suse.cz> (raw)
In-Reply-To: <20150310080024.GB3535@pd.tnic>

On Tue, 10 Mar 2015, Borislav Petkov wrote:

> Final patch:
> 
> ---
> From: Yinghai Lu <yinghai@kernel.org>
> Date: Sat, 7 Mar 2015 14:07:16 -0800
> Subject: [PATCH] x86/setup: Move compressed kernel to the end of the buffer
[ ... ]
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: Matt Fleming <matt.fleming@intel.com>
> Cc: Kees Cook <keescook@chromium.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Jiri Kosina <jkosina@suse.cz>
> Cc: linux-efi@vger.kernel.org
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Baoquan He <bhe@redhat.com>
> Fixes: f47233c2d34f ("x86/mm/ASLR: Propagate base load address calculation")

Thanks a lot for fixing my oversight.

Acked-by: Jiri Kosina <jkosina@suse.cz>

> Link: http://lkml.kernel.org/r/1425766041-6551-3-git-send-email-yinghai@kernel.org
> [ Commit message massively rewritten ]
> Signed-off-by: 
> ---
>  arch/x86/boot/compressed/head_32.S     | 11 +++++++++--
>  arch/x86/boot/compressed/head_64.S     |  8 ++++++--
>  arch/x86/boot/compressed/mkpiggy.c     |  7 ++-----
>  arch/x86/boot/compressed/vmlinux.lds.S |  1 +
>  arch/x86/boot/header.S                 |  2 +-
>  arch/x86/kernel/asm-offsets.c          |  1 +
>  arch/x86/kernel/vmlinux.lds.S          |  1 +
>  7 files changed, 21 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
> index cbed1407a5cd..a9b56f1d8e75 100644
> --- a/arch/x86/boot/compressed/head_32.S
> +++ b/arch/x86/boot/compressed/head_32.S
> @@ -147,7 +147,9 @@ preferred_addr:
>  1:
>  
>  	/* Target address to relocate to for decompression */
> -	addl	$z_extract_offset, %ebx
> +	movl    BP_init_size(%esi), %eax
> +	subl    $_end, %eax
> +	addl    %eax, %ebx
>  
>  	/* Set up the stack */
>  	leal	boot_stack_end(%ebx), %esp
> @@ -208,8 +210,13 @@ relocated:
>   */
>  				/* push arguments for decompress_kernel: */
>  	pushl	$z_output_len	/* decompressed length */
> -	leal	z_extract_offset_negative(%ebx), %ebp
> +
> +	movl    BP_init_size(%esi), %eax
> +	subl    $_end, %eax
> +	movl    %ebx, %ebp
> +	subl    %eax, %ebp
>  	pushl	%ebp		/* output address */
> +
>  	pushl	$z_input_len	/* input_len */
>  	leal	input_data(%ebx), %eax
>  	pushl	%eax		/* input_data */
> diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
> index 2884e0c3e8a5..69015b576cf6 100644
> --- a/arch/x86/boot/compressed/head_64.S
> +++ b/arch/x86/boot/compressed/head_64.S
> @@ -101,7 +101,9 @@ ENTRY(startup_32)
>  1:
>  
>  	/* Target address to relocate to for decompression */
> -	addl	$z_extract_offset, %ebx
> +	movl	BP_init_size(%esi), %eax
> +	subl	$_end, %eax
> +	addl	%eax, %ebx
>  
>  /*
>   * Prepare for entering 64 bit mode
> @@ -329,7 +331,9 @@ preferred_addr:
>  1:
>  
>  	/* Target address to relocate to for decompression */
> -	leaq	z_extract_offset(%rbp), %rbx
> +	movl	BP_init_size(%rsi), %ebx
> +	subl	$_end, %ebx
> +	addq	%rbp, %rbx
>  
>  	/* Set up the stack */
>  	leaq	boot_stack_end(%rbx), %rsp
> diff --git a/arch/x86/boot/compressed/mkpiggy.c b/arch/x86/boot/compressed/mkpiggy.c
> index b669ab65bf6c..c03b0097ce58 100644
> --- a/arch/x86/boot/compressed/mkpiggy.c
> +++ b/arch/x86/boot/compressed/mkpiggy.c
> @@ -80,11 +80,8 @@ int main(int argc, char *argv[])
>  	printf("z_input_len = %lu\n", ilen);
>  	printf(".globl z_output_len\n");
>  	printf("z_output_len = %lu\n", (unsigned long)olen);
> -	printf(".globl z_extract_offset\n");
> -	printf("z_extract_offset = 0x%lx\n", offs);
> -	/* z_extract_offset_negative allows simplification of head_32.S */
> -	printf(".globl z_extract_offset_negative\n");
> -	printf("z_extract_offset_negative = -0x%lx\n", offs);
> +	printf(".globl z_min_extract_offset\n");
> +	printf("z_min_extract_offset = 0x%lx\n", offs);
>  
>  	printf(".globl input_data, input_data_end\n");
>  	printf("input_data:\n");
> diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S
> index 34d047c98284..a80acabb80ec 100644
> --- a/arch/x86/boot/compressed/vmlinux.lds.S
> +++ b/arch/x86/boot/compressed/vmlinux.lds.S
> @@ -70,5 +70,6 @@ SECTIONS
>  		_epgtable = . ;
>  	}
>  #endif
> +	. = ALIGN(PAGE_SIZE);	/* keep size page-aligned */
>  	_end = .;
>  }
> diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
> index 16ef02596db2..9bfab22efdf7 100644
> --- a/arch/x86/boot/header.S
> +++ b/arch/x86/boot/header.S
> @@ -440,7 +440,7 @@ setup_data:		.quad 0			# 64-bit physical pointer to
>  
>  pref_address:		.quad LOAD_PHYSICAL_ADDR	# preferred load addr
>  
> -#define ZO_INIT_SIZE	(ZO__end - ZO_startup_32 + ZO_z_extract_offset)
> +#define ZO_INIT_SIZE	(ZO__end - ZO_startup_32 + ZO_z_min_extract_offset)
>  #define VO_INIT_SIZE	(VO__end - VO__text)
>  #if ZO_INIT_SIZE > VO_INIT_SIZE
>  #define INIT_SIZE ZO_INIT_SIZE
> diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
> index 9f6b9341950f..0e8e4f7a31ce 100644
> --- a/arch/x86/kernel/asm-offsets.c
> +++ b/arch/x86/kernel/asm-offsets.c
> @@ -66,6 +66,7 @@ void common(void) {
>  	OFFSET(BP_hardware_subarch, boot_params, hdr.hardware_subarch);
>  	OFFSET(BP_version, boot_params, hdr.version);
>  	OFFSET(BP_kernel_alignment, boot_params, hdr.kernel_alignment);
> +	OFFSET(BP_init_size, boot_params, hdr.init_size);
>  	OFFSET(BP_pref_address, boot_params, hdr.pref_address);
>  	OFFSET(BP_code32_start, boot_params, hdr.code32_start);
>  
> diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
> index 00bf300fd846..a92d3dc2812a 100644
> --- a/arch/x86/kernel/vmlinux.lds.S
> +++ b/arch/x86/kernel/vmlinux.lds.S
> @@ -325,6 +325,7 @@ SECTIONS
>  		__brk_limit = .;
>  	}
>  
> +	. = ALIGN(PAGE_SIZE);		/* keep init size page-aligned */
>  	_end = .;
>  
>          STABS_DEBUG
> -- 
> 2.2.0.33.gc18b867
> 
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> ECO tip #101: Trim your mails when you reply.
> --
> 

-- 
Jiri Kosina
SUSE Labs

  reply	other threads:[~2015-03-10  9:34 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-07 22:07 [PATCH v3 0/7] x86, boot: clean up kasl Yinghai Lu
2015-03-07 22:07 ` [PATCH v3 1/7] x86, kaslr: Use init_size instead of run_size Yinghai Lu
2015-03-09 12:49   ` Borislav Petkov
2015-03-09 15:58     ` Ingo Molnar
2015-03-09 15:58       ` Borislav Petkov
2015-03-09 19:35     ` Yinghai Lu
2015-03-09 20:00       ` Borislav Petkov
2015-03-09 20:06         ` Yinghai Lu
2015-03-09 20:18           ` Borislav Petkov
2015-03-09 21:28             ` Yinghai Lu
2015-03-10  0:42   ` Kees Cook
2015-03-13 12:27   ` Ingo Molnar
2015-03-14  2:47     ` Yinghai Lu
2015-03-14  7:53       ` Ingo Molnar
2015-03-14  9:59         ` Borislav Petkov
2015-03-16 10:06           ` [PATCH] Revert "x86/mm/ASLR: Propagate base load address calculation" Borislav Petkov
2015-03-16 12:11             ` [tip:x86/urgent] " tip-bot for Borislav Petkov
2015-03-16 19:32               ` Yinghai Lu
2015-03-16 13:56             ` [PATCH] " Jiri Kosina
2015-03-16 19:15               ` Yinghai Lu
2015-03-17  8:14                 ` Ingo Molnar
2015-03-07 22:07 ` [PATCH v3 2/7] x86, boot: Move ZO to end of buffer Yinghai Lu
2015-03-10  0:54   ` Kees Cook
2015-03-10  1:04     ` Yinghai Lu
2015-03-10  5:59     ` Borislav Petkov
2015-03-10  8:00   ` Borislav Petkov
2015-03-10  9:34     ` Jiri Kosina [this message]
2015-03-10  9:35       ` Borislav Petkov
2015-03-10 15:11     ` Yinghai Lu
2015-03-10 15:13       ` Borislav Petkov
2015-03-10 16:59     ` Kees Cook
2015-03-07 22:07 ` [PATCH v3 3/7] x86, boot: Don't overlap VO with ZO data Yinghai Lu
2015-03-10  9:34   ` Borislav Petkov
2015-03-10 15:05     ` Yinghai Lu
2015-03-10 15:10       ` Borislav Petkov
2015-03-10 15:17         ` Yinghai Lu
2015-03-10 15:21           ` Borislav Petkov
2015-03-10 15:42             ` Yinghai Lu
2015-03-10 15:48               ` Borislav Petkov
2015-03-10 19:29                 ` Yinghai Lu
2015-03-07 22:07 ` [PATCH v3 4/7] x86, kaslr: Access the correct kaslr_enabled variable Yinghai Lu
2015-03-10  0:55   ` Kees Cook
2015-03-07 22:07 ` [PATCH v3 5/7] x86, kaslr: Consolidate mem_avoid array filling Yinghai Lu
2015-03-10  1:00   ` Kees Cook
2015-03-10  1:10     ` Yinghai Lu
2015-03-10  1:26       ` Kees Cook
2015-03-07 22:07 ` [PATCH v3 6/7] x86, boot: Split kernel_ident_mapping_init to another file Yinghai Lu
2015-03-10  1:03   ` Kees Cook
2015-03-07 22:07 ` [PATCH v3 7/7] x86, kaslr, 64bit: Set new or extra ident_mapping Yinghai Lu
2015-03-10  1:09   ` Kees Cook
2015-03-10  1:14     ` Yinghai Lu
2015-03-10  6:54       ` Yinghai Lu
2015-03-10  0:39 ` [PATCH v3 0/7] x86, boot: clean up kasl Kees Cook
2015-03-10  0:54   ` Yinghai Lu

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