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Making C Less Dangerous in the Linux kernel
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lca
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lca2019
--room c2 14515 --force
Next: 13 Who pays the piper? The caller of the tune.
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Marks
Author(s):
Kees Cook
Location
C2
Date
jan Fri 25
Days Raw Files
Start
13:30
First Raw Start
13:01
Duration
0:45:0
Offset
0:28:29
End
14:15
Last Raw End
14:31
Chapters
00:00
0:01:30
0:31:29
Total cuts_time
44 min.
https://2019.linux.conf.au/schedule/presentation/178/
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With the Linux kernel written in C, it comes with some worrisome baggage, "undefined" behaviors, and other weaknesses that lead to security flaws and vulnerable infrastructure. Some of these weaknesses related to the design of chipsets and how close C is to machine code, but others are less specific. This presentation will explore the areas where the kernel is changing the C standard, defining undefined behaviors, or otherwise reorganizing things to make C itself less of a hazard. Specifically this will cover removing (and enforcing the lack of) Variable Length Arrays in kernel code, forcing all stack variables to be initialized with a GCC plugin, performing implicit bounds checking with overloaded builtins, handling arithmetic overflows safely, and protecting forward (call) and reverse (return) indirect function calls with CFI under Clang.
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