[dhcp6relay] a couple memory access protections #9851
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Signed-off-by: Ying Xie <ying.xie@microsoft.com>
Use config->interface->c_str() directly without strcpy. The original strcpy code has memory corruption due to adding null terminator. Signed-off-by: Ying Xie <ying.xie@microsoft.com>
saiarcot895
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Jan 26, 2022
kellyyeh
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Jan 26, 2022
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qiluo-msft
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Jan 31, 2022
Why I did it the strcpy and buffer allocation is not safe, it corrupts 1 byte on the stack. Depending on the memory layout, it may or may not cause issue immediately. message type is not validated before updating the counter. Which could cause segment fault. How I did it Remove the unsafe strcpy, use config->interface.c_str() instead. Check message type before updating counters. How to verify it The issue (1) caused segment fault on a specific platform. The fix was validated there. Issue (2) was precautionary. Added log in case it triggers.
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Why I did it the strcpy and buffer allocation is not safe, it corrupts 1 byte on the stack. Depending on the memory layout, it may or may not cause issue immediately. message type is not validated before updating the counter. Which could cause segment fault. How I did it Remove the unsafe strcpy, use config->interface.c_str() instead. Check message type before updating counters. How to verify it The issue (1) caused segment fault on a specific platform. The fix was validated there. Issue (2) was precautionary. Added log in case it triggers.
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Why I did it
How I did it
How to verify it
The issue (1) caused segment fault on a specific platform. The fix was validated there. Issue (2) was precautionary. Added log in case it triggers.