linux-kernel - Re: [PATCH v2] x86/efi-bgrt: Switch all pr_err() to pr

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 3 May 2016 11:39:36 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>, linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86/efi-bgrt: Switch all pr_err() to pr_notice() for
 invalid BGRT

On Tue, May 03, 2016 at 01:47:04PM -0400, Josh Boyer wrote:
> The promise of pretty boot splashes from firmware via BGRT was at
> best only that; a promise.  The kernel diligently checks to make
> sure the BGRT data firmware gives it is valid, and dutifully warns
> the user when it isn't.  However, it does so via the pr_err log
> level which seems unnecessary.  The user cannot do anything about
> this and there really isn't an error on the part of Linux to
> correct.
> 
> This lowers the log level by using pr_notice instead.  Users will
> no longer have their boot process uglified by the kernel reminding
> us that firmware can and often is broken when the 'quiet' kernel
> parameter is specified.  Ironic, considering BGRT is supposed to
> make boot pretty to begin with.
> 
> Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>

Thank you for the updated patch.

Reviewed-by: Josh Triplett <josh@...htriplett.org>

> ---
> 
> v2: Switch to using pr_notice instead of pr_debug
> 
>  arch/x86/platform/efi/efi-bgrt.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/x86/platform/efi/efi-bgrt.c b/arch/x86/platform/efi/efi-bgrt.c
> index a2433817c987..6a2f5691b1ab 100644
> --- a/arch/x86/platform/efi/efi-bgrt.c
> +++ b/arch/x86/platform/efi/efi-bgrt.c
> @@ -43,40 +43,40 @@ void __init efi_bgrt_init(void)
>  		return;
>  
>  	if (bgrt_tab->header.length < sizeof(*bgrt_tab)) {
> -		pr_err("Ignoring BGRT: invalid length %u (expected %zu)\n",
> +		pr_notice("Ignoring BGRT: invalid length %u (expected %zu)\n",
>  		       bgrt_tab->header.length, sizeof(*bgrt_tab));
>  		return;
>  	}
>  	if (bgrt_tab->version != 1) {
> -		pr_err("Ignoring BGRT: invalid version %u (expected 1)\n",
> +		pr_notice("Ignoring BGRT: invalid version %u (expected 1)\n",
>  		       bgrt_tab->version);
>  		return;
>  	}
>  	if (bgrt_tab->status & 0xfe) {
> -		pr_err("Ignoring BGRT: reserved status bits are non-zero %u\n",
> +		pr_notice("Ignoring BGRT: reserved status bits are non-zero %u\n",
>  		       bgrt_tab->status);
>  		return;
>  	}
>  	if (bgrt_tab->image_type != 0) {
> -		pr_err("Ignoring BGRT: invalid image type %u (expected 0)\n",
> +		pr_notice("Ignoring BGRT: invalid image type %u (expected 0)\n",
>  		       bgrt_tab->image_type);
>  		return;
>  	}
>  	if (!bgrt_tab->image_address) {
> -		pr_err("Ignoring BGRT: null image address\n");
> +		pr_notice("Ignoring BGRT: null image address\n");
>  		return;
>  	}
>  
>  	image = memremap(bgrt_tab->image_address, sizeof(bmp_header), MEMREMAP_WB);
>  	if (!image) {
> -		pr_err("Ignoring BGRT: failed to map image header memory\n");
> +		pr_notice("Ignoring BGRT: failed to map image header memory\n");
>  		return;
>  	}
>  
>  	memcpy(&bmp_header, image, sizeof(bmp_header));
>  	memunmap(image);
>  	if (bmp_header.id != 0x4d42) {
> -		pr_err("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
> +		pr_notice("Ignoring BGRT: Incorrect BMP magic number 0x%x (expected 0x4d42)\n",
>  			bmp_header.id);
>  		return;
>  	}
> @@ -84,14 +84,14 @@ void __init efi_bgrt_init(void)
>  
>  	bgrt_image = kmalloc(bgrt_image_size, GFP_KERNEL | __GFP_NOWARN);
>  	if (!bgrt_image) {
> -		pr_err("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
> +		pr_notice("Ignoring BGRT: failed to allocate memory for image (wanted %zu bytes)\n",
>  		       bgrt_image_size);
>  		return;
>  	}
>  
>  	image = memremap(bgrt_tab->image_address, bmp_header.size, MEMREMAP_WB);
>  	if (!image) {
> -		pr_err("Ignoring BGRT: failed to map image memory\n");
> +		pr_notice("Ignoring BGRT: failed to map image memory\n");
>  		kfree(bgrt_image);
>  		bgrt_image = NULL;
>  		return;
> -- 
> 2.5.5
>