fix: System shared memory boundary check #8335
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yinggeh
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yinggeh
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yinggeh
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Aug 7, 2025
| create_byte_size=create_byte_size, | ||
| register_offset=register_offset, | ||
| ) | ||
| offset = 1 |
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Smaller offset for stricter check.
yinggeh
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Aug 7, 2025
| error_msg = [] | ||
| self._configure_server() | ||
| create_byte_size = self.SYS_PAGE_SIZE + self.DEFAULT_SHM_BYTE_SIZE | ||
| register_offset = self.SYS_PAGE_SIZE |
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Before this fix, out-of-bound would not be triggered if register_offset is non-zero.
yinggeh
commented
Aug 7, 2025
| size_t shm_region_size = 0; | ||
| if (it->second->byte_size_ > 0) { | ||
| shm_region_end += it->second->byte_size_ - 1; | ||
| shm_region_size += it->second->byte_size_; |
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Remove -1 for better readability.
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Thanks! This actually avoids a potential unsigned integer underflow if both offset and byte_size are 0. I had just encountered this underflow last week.
tanmayv25
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What does the PR do?
Followup from the original request. Similar bug in shared memory boundary checks.
Modify test cases to include
register_offsetin boundary checks.Checklist
<commit_type>: <Title>Commit Type:
Check the conventional commit type
box here and add the label to the github PR.
Related PRs:
#8334
Where should the reviewer start?
Test plan:
L0_shared_memory
32964778
Caveats:
Background
Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)