Melnytskyi Artem "A Little About the Bugs in the Code"

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The document discusses different types of bugs that can occur in code including memory access bugs, threading bugs, and undefined behavior bugs. Memory access bugs include buffer overflows, erroneous type casts, use-after-free errors. Threading bugs include mutex issues, deadlocks, data races, and atomicity violations. Undefined behavior bugs involve issues like initialization order problems, one definition rule violations, and integer overflows.

Automotive

www.luxoft.com
Artem Melnytskyi
A Little About the
Bugs in the Code

www.luxoft.com
Coding
Coffee
Code review
About me
Coffee
Coding
Code
review

www.luxoft.com
It’s about
• Bug classification
• Memory access bugs
• Threading bugs
• Undefined behavior bug

www.luxoft.com
Before the beginning…
• Nothing here claims to be the truth in the last instance.
• Yes, I know that on another compiler, and another platform (on which you were lucky
enough to work) this may not be so.

www.luxoft.com
Memory access
bugs
Buffer
overflow
Erroneous
type cast
Use-after-
free
Use-after-
return
Use-after-
scope
[De]allocation
bugs
Memory
leaks
Use of
uninitialized
memory
Threading
bugs
Mutex
Deadlock
Data
Races
Race on a
bitfield
Race During
Destruction
VPTR:
construction
order
Race on
VPTR
Race on VPTR
(cont)
Atomicity
violation
Atomicity violation
(cont)
Other
Undefined
Behavior
Init Order
Fiasco
ODR (one
definition rule)
Violation
Lack of
Sequence Point
Integer
Overflow
Bug classification

www.luxoft.com
bug
in GCC
Memory access bugs

www.luxoft.com
Алло RAIIчка, ты сейчас упадешь!
Memory access bugs

www.luxoft.com
https://www.viva64.com/en/a/0079/
100 Bugs in Open Source C/C++ projects

www.luxoft.com
Init Order
Fiasco
Other Undefined Behavior

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Melnytskyi Artem "A Little About the Bugs in the Code"

1. www.luxoft.com Artem Melnytskyi A Little About the Bugs in the Code

2. www.luxoft.com Coding Coffee Code review About me Coffee Coding Code review

3. www.luxoft.com It’s about • Bug classification • Memory access bugs • Threading bugs • Undefined behavior bug

4. www.luxoft.com Before the beginning… • Nothing here claims to be the truth in the last instance. • Yes, I know that on another compiler, and another platform (on which you were lucky enough to work) this may not be so.

5. www.luxoft.com Memory access bugs Buffer overflow Erroneous type cast Use-after- free Use-after- return Use-after- scope [De]allocation bugs Memory leaks Use of uninitialized memory Threading bugs Mutex Deadlock Data Races Race on a bitfield Race During Destruction VPTR: construction order Race on VPTR Race on VPTR (cont) Atomicity violation Atomicity violation (cont) Other Undefined Behavior Init Order Fiasco ODR (one definition rule) Violation Lack of Sequence Point Integer Overflow Bug classification

6. www.luxoft.com

7. www.luxoft.com bug in GCC Memory access bugs

8. www.luxoft.com bug in GCC Memory access bugs

9. www.luxoft.com bug in GCC Memory access bugs

10. www.luxoft.com bug in GCC Memory access bugs

11. www.luxoft.com Алло RAIIчка, ты сейчас упадешь! Memory access bugs

12. www.luxoft.com Memory access bugs

13. www.luxoft.com Memory access bugs

14. www.luxoft.com https://www.viva64.com/en/a/0079/ 100 Bugs in Open Source C/C++ projects

15. www.luxoft.com Memory access bugs

16. www.luxoft.com Threading bugs

17. www.luxoft.com Threading bugs