Chris Wilson
91b712cffa
drm/i915: Prevent writing into a read-only object via a GGTT mmap ...
commit 3e977ac6179b39faa3c0eda5fce4f00663ae298d upstream.
If the user has created a read-only object, they should not be allowed
to circumvent the write protection by using a GGTT mmapping. Deny it.
Also most machines do not support read-only GGTT PTEs, so again we have
to reject attempted writes. Fortunately, this is known a priori, so we
can at least reject in the call to create the mmap (with a sanity check
in the fault handler).
v2: Check the vma->vm_flags during mmap() to allow readonly access.
v3: Remove VM_MAYWRITE to curtail mprotect()
Testcase: igt/gem_userptr_blits/readonly_mmap*
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com> #v1
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180712185315.3288-4-chris@chris-wilson.co.uk
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Jon Bloomfield <jon.bloomfield@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-12 19:16:16 +01:00
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2016-09-19 15:04:32 +02:00
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2016-08-29 15:37:28 +02:00
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2016-09-19 15:03:46 +02:00
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2016-07-19 10:29:47 +02:00
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2016-06-21 22:10:55 +02:00
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2016-09-19 15:04:15 +02:00
drm: Extract drm_bridge.h
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2016-10-26 18:48:05 +02:00
drm/kms-helpers: Extract drm_modeset_helper.[hc]
2016-08-16 16:10:19 +02:00
drm: Move a few macros away from drm_crtc.h
2016-09-19 15:03:46 +02:00
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2015-11-24 11:47:46 +01:00
drm: simple_kms_helper: Add prepare_fb and cleanup_fb hooks
2016-10-05 15:18:02 +02:00
drm/i915: Prevent writing into a read-only object via a GGTT mmap
2019-11-12 19:16:16 +01:00
drm: Don't race connector registration
2017-06-17 06:41:53 +02:00
drm/i915: Add get_eld audio component
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drm: avoid "possible bad bitmask?" warning
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91b712cffa