qemu-e2k/plugins
Daniele Buono c905a3680d cfi: Initial support for cfi-icall in QEMU
LLVM/Clang, supports runtime checks for forward-edge Control-Flow
Integrity (CFI).

CFI on indirect function calls (cfi-icall) ensures that, in indirect
function calls, the function called is of the right signature for the
pointer type defined at compile time.

For this check to work, the code must always respect the function
signature when using function pointer, the function must be defined
at compile time, and be compiled with link-time optimization.

This rules out, for example, shared libraries that are dynamically loaded
(given that functions are not known at compile time), and code that is
dynamically generated at run-time.

This patch:

1) Introduces the CONFIG_CFI flag to support cfi in QEMU

2) Introduces a decorator to allow the definition of "sensitive"
functions, where a non-instrumented function may be called at runtime
through a pointer. The decorator will take care of disabling cfi-icall
checks on such functions, when cfi is enabled.

3) Marks functions currently in QEMU that exhibit such behavior,
in particular:
- The function in TCG that calls pre-compiled TBs
- The function in TCI that interprets instructions
- Functions in the plugin infrastructures that jump to callbacks
- Functions in util that directly call a signal handler

Signed-off-by: Daniele Buono <dbuono@linux.vnet.ibm.com>
Acked-by: Alex Bennée <alex.bennee@linaro.org
Message-Id: <20201204230615.2392-3-dbuono@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-01-02 21:03:35 +01:00
..
api.c qemu/qemu-plugin: Make qemu_plugin_hwaddr_is_io() hwaddr argument const 2020-05-15 15:25:16 +01:00
core.c cfi: Initial support for cfi-icall in QEMU 2021-01-02 21:03:35 +01:00
loader.c cfi: Initial support for cfi-icall in QEMU 2021-01-02 21:03:35 +01:00
meson.build meson: link emulators without Makefile.target 2020-08-21 06:30:40 -04:00
plugin.h tcg plugins: expose an API version concept 2019-11-12 14:32:55 +00:00
qemu-plugins.symbols plugin: add qemu_plugin_outs helper 2019-10-28 15:12:38 +00:00