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android: Fix 32-bit app crashing in 64-bit Android 

Seemingly the 64-bit int is always aligned to 8 in LP64.
But this is not hold in LP32.

Consequently sizeof(gralloc_drm_handle_t) are different
between LP64 (which is 18 ints) and LP32 (which is 16 ints).
As a result, 32-bit apps will crash in 64-bit OS since the
checking handle->base.numInts != GRALLOC_GBM_HANDLE_NUM_INTS
is true.

Fix it by always aligning 64-bit int to 8. Besides, to avoid
additional padding, just exchange the order of data_owner
and modifier. It aligns modifier to 8 natually.
This makes gralloc_drm_handle_t fit in 16 ints perfectly.

(v2) gralloc_drm_handle.h patch now applied in gralloc_handle.h
     and GRALLOC_HANDLE_VERSION updated to 4

Reported-by: Mauro Rossi <issor.oruam@gmail.com>
Signed-off-by: Chih-Wei Huang <cwhuang@linux.org.tw>
Reviewed-by: Robert Foss <robert.foss@collabora.com>
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Mauro Rossi 2018-12-11 23:22:35 +01:00 committed by Robert Foss
parent 2c02f1e610
commit 597725e951
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1 changed files with 3 additions and 3 deletions
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6
android/gralloc_handle.h
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@ -60,16 +60,16 @@ struct gralloc_handle_t {
uint32_t usage; /* android libhardware usage flags */
uint32_t stride; /* the stride in bytes */
uint64_t modifier; /* buffer modifiers */
int data_owner; /* owner of data (for validation) */
uint64_t modifier __attribute__((aligned(8))); /* buffer modifiers */
union {
void *data; /* pointer to struct gralloc_gbm_bo_t */
uint64_t reserved;
} __attribute__((aligned(8)));
};
#define GRALLOC_HANDLE_VERSION 3
#define GRALLOC_HANDLE_VERSION 4
#define GRALLOC_HANDLE_MAGIC 0x60585350
#define GRALLOC_HANDLE_NUM_FDS 1
#define GRALLOC_HANDLE_NUM_INTS ( \