Re: [Xen-devel] [PATCH v3 01/12] fuzz/x86_emulate: Clear errors after each iteration

[Ian Jackson <ian.jackson@xxxxxxxxxxxxx>]

George Dunlap writes ("[PATCH v3 01/12] fuzz/x86_emulate: Clear errors after 
each iteration"):
> Once feof() returns true for a stream, it will continue to return true
> for that stream until clearerr() is called (or the stream is closed
> and re-opened).
> 
> In llvm-clang-fast-mode, the same file descriptor is used for each
> iteration of the loop, meaning that the "Input too large" check was
> broken -- feof() would return true even if the fread() hadn't hit the
> end of the file.  The result is that AFL generates testcases of
> arbitrary size.
> 
> Fix this by fseek'ing to the beginning of the file on every iteration;
> this resets the EOF marker and other state.

Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

> This is a candidate for backport to 4.9.

Please let me know when it is committed and I will add it to my
backport list.

Ian.

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