KFuzzTest: refactor and improve input format #8
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added 3 commits
August 3, 2025 15:53
WIP. Lots of validation to introduce, and more refactoring so that data doesn't leak.
ethangraham2001
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Aug 4, 2025
added 6 commits
August 5, 2025 06:41
Export kasan_poison by moving it to include/linux. Move lots of things around into separate .c files to keep kfuzztest.h barebones.
We are going to remove distinct mode in favor of only poisoning the padding areas between payload regions.
Also move functions out of mm/kasan/kasan.h into include/linux/kasan.h
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August 6, 2025 09:20
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August 7, 2025 19:32
kfuzztest: update documentation
Checks that KASAN is enabled before poisoning a region.
added 4 commits
August 7, 2025 19:32
We now check for overflows a lot more carefully, and validate the input so that regions don't point out of bounds. Fix some nits etc...
We now assume that there is at least 8 bytes of padding before the payload. This means that we never poison the relocation table, which isn't a bad thing in my opinion.
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August 8, 2025 09:14
Function now bails out when CONFIG_KASAN is not built in, which prevents checks.
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Relocation format now uses poisoning. Part of the functionality for this involved
exporting some functions from
mm/kasan/kasan.hfrominclude/linux/kasan.hinstead so that they could be used by KFuzzTest.
Also did some refactoring to make things nicer.
And since we use ranges now, add a macro
KFUZZTEST_REGION_SIZE(n)which can tellus the size of a region, for some optional in-fuzz-driver validation. This could be
real helpful, as we can discard inputs whose buffer sizes are different than the
advertised ones.