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qemu-2.12.1 crashes when running malicious bootloader.
Running specific bootloader on Qemu causes fatal error and
hence SIGABRT in /qemu-2.12.1/tcg/tcg.c on line 2684.
Bootloader binary code is included in attachments.
The code was generated by assembling a valid bootloader, then
appending random-bytes from file `/dev/urandom` to the binary file.
This is a bug, obviously, but note that we do not guarantee TCG binary translation to be a security boundary against malicious code. Don't run guest code you don't trust inside TCG without further sandboxing around QEMU. (Much of the code that runs in a TCG configuration is old and unaudited, so there may be lurking bugs. Configurations using KVM are the only ones where we treat guest escapes as security bugs.)
I think this bug was fixed in QEMU 3.1 -- I can reproduce the assert on 3.0 but not on 3.1.
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