linux-kernel - Re: [PATCH] Fixed an off-by-one error in the AMD IOMMU driver.

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] [day] [month] [year] [list]

Date:	Thu, 14 May 2009 15:47:17 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Neil Turton <nturton@...arflare.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] Fixed an off-by-one error in the AMD IOMMU driver.

On Thu, May 14, 2009 at 02:00:35PM +0100, Neil Turton wrote:
> The variable amd_iommu_last_bdf holds the maximum bdf of any device
> controlled by an IOMMU, so the number of device entries needed is
> amd_iommu_last_bdf+1.  The function tbl_size used amd_iommu_last_bdf
> instead.  This would be a problem if the last device were a large
> enough power of 2.
> 
> Signed-off-by: Neil Turton <nturton@...arflare.com>
> ---
>  arch/x86/kernel/amd_iommu_init.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
> index 42c33ce..61479ba 100644
> --- a/arch/x86/kernel/amd_iommu_init.c
> +++ b/arch/x86/kernel/amd_iommu_init.c
> @@ -175,7 +175,7 @@ static inline void update_last_devid(u16 devid)
>  static inline unsigned long tbl_size(int entry_size)
>  {
>  	unsigned shift = PAGE_SHIFT +
> -			 get_order(amd_iommu_last_bdf * entry_size);
> +			 get_order(((int)amd_iommu_last_bdf+1) * entry_size);
> 
>  	return 1UL << shift;
>  }

Applied, thanks Neil.

-- 
           | Advanced Micro Devices GmbH
 Operating | Karl-Hammerschmidt-Str. 34, 85609 Dornach bei München
 System    | 
 Research  | Geschäftsführer: Thomas M. McCoy, Giuliano Meroni
 Center    | Sitz: Dornach, Gemeinde Aschheim, Landkreis München
           | Registergericht München, HRB Nr. 43632

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/