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What does _0_4_ mean in ghidra?

  • Did you look at the disassembly that related to this line? – macro_controller Jan 13 at 14:47
  • iirc ghidra uses the split notations to indicate bitmasks i might be mistaken since you accepted pavels answer and it has been upvoted also dont have ghidra at hand so cant confirm – blabb Jan 13 at 16:25
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It is being used when there's a mismatch between type sizes in the decompiled code and Ghidra cannot show you that the whole variable is being modified.

Your PUCHAR - since it is a pointer and this is (probably) 64-bit is 8 bytes. But analyzing the disassembly Ghidra sees that only 4 bytes are being set to 0 in this line (for example a 32 bit register is used).

One of the fix you can apply is by correcting the type of local_res8 (CTRL+L) but it might be the case that the type is ok, and in fact only lower 32-bits are being set..

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