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  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:   Fri, 27 Apr 2018 11:46:12 +0200
From:   Thierry Reding <>
To:     Dmitry Osipenko <>
Cc:     Jonathan Hunter <>,
        Joerg Roedel <>,,,
Subject: Re: [PATCH v1 1/4] iommu/tegra: gart: Add debugging facility

On Mon, Apr 09, 2018 at 11:07:19PM +0300, Dmitry Osipenko wrote:
> Page mapping could overwritten by an accident (a bug). We can catch this
> case by checking 'VALID' bit of GART's page entry prior to mapping of a
> page. Since that check introduces a small performance impact, it should be
> enabled explicitly using new GART's kernel module 'debug' parameter.
> Signed-off-by: Dmitry Osipenko <>
> ---
>  drivers/iommu/tegra-gart.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)

I think this was discussed before, but this really shouldn't be needed
unless the IOVA allocator or GART driver are buggy.

That said, I think this has some usefulness to find such bugs, so:

Acked-by: Thierry Reding <>

Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)

Powered by blists - more mailing lists