[WinAfl] [DynamoRIO] winAfl crash when using "Sample delivery via shared memory"

[salihboshnak]

HI

Setup details:

OS: Windows Server 2022 Standard, 21H2, 64bit OS, x64-based processor, 40 cores
WinAFL with DynamoRIO:

winAFL: 1.17 based on AFL 2.43b
compiled 64bit version with visual studio 2022

DynamoRIO: 11.3.0
took the already compiled binaries
( did not compile it my self )

I implemented the sample delivery via regular file and also via shared memory

when i run the shared memory version
i get the following error:

WinAFL internal crash at PC 0x00007ff6212b2afc

on the "Status Screen", i get the following error message
0 processes nudged
nudge operation failed, verify permissions and parameters.

Important Note:
the frequency of this error is bigger when using parallel fuzzers ( for example: using 1 master and 3 slaves )

compared to regular sample delivery via disk, this error is not triggered
even in parallel fuzzers

Note: shared memory sample delivery was implemented according to the given example:
https://github.com/googleprojectzero/Jackalope/blob/6d92931b2cf614699e2a023254d5ee7e20f6e34b/test.cpp#L41
https://github.com/googleprojectzero/Jackalope/blob/6d92931b2cf614699e2a023254d5ee7e20f6e34b/test.cpp#L111

[ifratric]

Hi, can you reproduce the issue using https://github.com/googleprojectzero/Jackalope/blob/main/test.cpp as target, or only with your custom target? How often does the issue occur?