From: Ben Hutchings <ben@decadent.org.uk>
To: Kees Cook <kees.cook@canonical.com>
Cc: Dave Airlie <airlied@redhat.com>, dri-devel@lists.freedesktop.org
Subject: high_memory address in /proc/dri/*/vma
Date: Mon, 19 Dec 2011 01:23:04 +0000 [thread overview]
Message-ID: <1324257784.2844.88.camel@deadeye> (raw)
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Kees, in commit 01e2f533a234dc62d16c0d3d4fb9d71cf1ce50c3 ("drm: do not
leak kernel addresses via /proc/dri/*/vma") you changed the logging of
high_memory:
- seq_printf(m, "vma use count: %d, high_memory = %p, 0x%08llx\n",
+ seq_printf(m, "vma use count: %d, high_memory = %pK, 0x%pK\n",
atomic_read(&dev->vma_count),
- high_memory, (u64)virt_to_phys(high_memory));
+ high_memory, (void *)virt_to_phys(high_memory));
This doesn't make sense because the physical address may be truncated
(in theory at least).
I think it would make more sense to make this entire file readable by
root only, but I don't know whether anything depends on being able to
read it. Its existence is conditional on DRM_DEBUG_CODE != 0 but that
is always true at the moment.
Ben.
--
Ben Hutchings
Humans are not rational beings; they are rationalising beings.
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next reply other threads:[~2011-12-19 1:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-19 1:23 Ben Hutchings [this message]
-- strict thread matches above, loose matches on Subject: below --
2011-12-20 0:09 high_memory address in /proc/dri/*/vma Ben Hutchings
2011-12-20 0:14 ` Kees Cook
2011-12-20 2:18 ` Ben Hutchings
2011-12-20 2:35 ` Kees Cook
2011-12-20 4:23 ` Ben Hutchings
2011-12-20 16:32 ` Daniel Vetter
2011-12-20 17:59 ` Kees Cook
2011-12-20 19:03 ` Ben Hutchings
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