Elf header buffer too small to boot the os.

[luzhihaoTestingLab]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

1.10.1.

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

qemu-system-x86_64

What did you do?

I boot the os as README.md shows, but there is an error showing "read too few elf bytes (program headers)". I found it's caused by the 512 bytes file's header read buffer(biscuit/src/kernel/syscall.go line 3315), and my file's size exceeds 512, which makes it boots failed.

[wuhang-du]

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