emo/hardened_malloc
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use 1 slot for all extended size classes

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This reduces memory usage and improves security in combination with the
guard slab feature.
This commit is contained in:
Daniel Micay 2021-05-01 22:10:20 -04:00
parent 3952645318
commit 8bfa1a7dd5
2 changed files with 5 additions and 5 deletions
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8
README.md
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@ -589,10 +589,10 @@ retaining the isolation.
| size class | worst case internal fragmentation | slab slots | slab size | internal fragmentation for slabs |
| - | - | - | - | - |
| 20480 | 20.0% | 2 | 40960 | 0.0% |
| 24576 | 16.66% | 2 | 49152 | 0.0% |
| 28672 | 14.28% | 2 | 57344 | 0.0% |
| 32768 | 12.5% | 2 | 65536 | 0.0% |
| 20480 | 20.0% | 1 | 20480 | 0.0% |
| 24576 | 16.66% | 1 | 24576 | 0.0% |
| 28672 | 14.28% | 1 | 28672 | 0.0% |
| 32768 | 12.5% | 1 | 32768 | 0.0% |
| 40960 | 20.0% | 1 | 40960 | 0.0% |
| 49152 | 16.66% | 1 | 49152 | 0.0% |
| 57344 | 14.28% | 1 | 57344 | 0.0% |

2
h_malloc.c
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@ -144,7 +144,7 @@ static const u16 size_class_slots[] = {
/* 1024 */ 8, 8, 8, 8,
/* 2048 */ 6, 5, 4, 4,
#if CONFIG_EXTENDED_SIZE_CLASSES
/* 4096 */ 2, 2, 2, 2,
/* 4096 */ 1, 1, 1, 1,
/* 8192 */ 1, 1, 1, 1,
/* 16384 */ 1, 1, 1, 1,
#endif