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drm/i915/gem: consolidate 2big error checking for object sizes

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Throw it into a simple helper, and throw a warning if we encounter an
object which has been initialised with an object size that exceeds our
limit of INT_MAX pages.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20210122181514.541436-2-matthew.auld@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Matthew Auld 2021-01-22 18:15:14 +00:00 committed by Daniel Vetter
parent f63f452ea6
commit ae2fb480f3
4 changed files with 29 additions and 34 deletions
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9
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
View file

@ -244,14 +244,7 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
}
}
/*
* XXX: There is a prevalence of the assumption that we fit the
* object's page count inside a 32bit _signed_ variable. Let's document
* this and catch if we ever need to fix it. In the meantime, if you do
* spot such a local variable, please consider fixing!
*/
if (dma_buf->size >> PAGE_SHIFT > INT_MAX)
if (i915_gem_object_size_2big(dma_buf->size))
return ERR_PTR(-E2BIG);
/* need to attach */

26
drivers/gpu/drm/i915/gem/i915_gem_object.h
View file

@ -16,6 +16,32 @@
#include "i915_gem_gtt.h"
#include "i915_vma_types.h"
/*
* XXX: There is a prevalence of the assumption that we fit the
* object's page count inside a 32bit _signed_ variable. Let's document
* this and catch if we ever need to fix it. In the meantime, if you do
* spot such a local variable, please consider fixing!
*
* Aside from our own locals (for which we have no excuse!):
* - sg_table embeds unsigned int for num_pages
* - get_user_pages*() mixed ints with longs
*/
#define GEM_CHECK_SIZE_OVERFLOW(sz) \
GEM_WARN_ON((sz) >> PAGE_SHIFT > INT_MAX)
static inline bool i915_gem_object_size_2big(u64 size)
{
struct drm_i915_gem_object *obj;
if (GEM_CHECK_SIZE_OVERFLOW(size))
return true;
if (overflows_type(size, obj->base.size))
return true;
return false;
}
void i915_gem_init__objects(struct drm_i915_private *i915);
struct drm_i915_gem_object *i915_gem_object_alloc(void);

12
drivers/gpu/drm/i915/gem/i915_gem_region.c
View file

@ -161,17 +161,7 @@ i915_gem_object_create_region(struct intel_memory_region *mem,
GEM_BUG_ON(!size);
GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_MIN_ALIGNMENT));
/*
* XXX: There is a prevalence of the assumption that we fit the
* object's page count inside a 32bit _signed_ variable. Let's document
* this and catch if we ever need to fix it. In the meantime, if you do
* spot such a local variable, please consider fixing!
*/
if (size >> PAGE_SHIFT > INT_MAX)
return ERR_PTR(-E2BIG);
if (overflows_type(size, obj->base.size))
if (i915_gem_object_size_2big(size))
return ERR_PTR(-E2BIG);
obj = i915_gem_object_alloc();

16
drivers/gpu/drm/i915/gem/i915_gem_userptr.c
View file

@ -770,21 +770,7 @@ i915_gem_userptr_ioctl(struct drm_device *dev,
I915_USERPTR_UNSYNCHRONIZED))
return -EINVAL;
/*
* XXX: There is a prevalence of the assumption that we fit the
* object's page count inside a 32bit _signed_ variable. Let's document
* this and catch if we ever need to fix it. In the meantime, if you do
* spot such a local variable, please consider fixing!
*
* Aside from our own locals (for which we have no excuse!):
* - sg_table embeds unsigned int for num_pages
* - get_user_pages*() mixed ints with longs
*/
if (args->user_size >> PAGE_SHIFT > INT_MAX)
return -E2BIG;
if (overflows_type(args->user_size, obj->base.size))
if (i915_gem_object_size_2big(args->user_size))
return -E2BIG;
if (!args->user_size)