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2021-01-02cfi: Initial support for cfi-icall in QEMUDaniele Buono
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>
2020-12-15plugin: propagate errorsPaolo Bonzini
qemu_finish_machine_init currently can only exit QEMU if it fails. Prepare for giving it proper error propagation, and possibly for adding a plugin_add monitor command that calls an accelerator method. While at it, make all errors from plugin_load look the same. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-13Remove superfluous .gitignore filesThomas Huth
Since we are now always doing out-of-tree builds, these gitignore files should not be necessary anymore. Message-Id: <20200919133637.72744-1-thuth@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2020-10-09plugins: Fixes a issue when dlsym failed, the handle not closedYonggang Luo
Signed-off-by: Yonggang Luo <luoyonggang@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20201001163429.1348-2-luoyonggang@gmail.com> Message-Id: <20201007160038.26953-20-alex.bennee@linaro.org>
2020-08-21meson: link emulators without Makefile.targetPaolo Bonzini
The binaries move to the root directory, e.g. qemu-system-i386 or qemu-arm. This requires changes to qtests, CI, etc. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-08-21meson: pluginsPaolo Bonzini
For now link arguments end up in Makefile.target, they will move to the right place soon. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-05-15qemu/qemu-plugin: Make qemu_plugin_hwaddr_is_io() hwaddr argument constPhilippe Mathieu-Daudé
Rename qemu_plugin_hwaddr_is_io() address argument 'haddr' similarly to qemu_plugin_hwaddr_device_offset(), and make it const. Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20200510171119.20827-4-f4bug@amsat.org> Message-Id: <20200513173200.11830-4-alex.bennee@linaro.org>
2020-03-17lockable: add QemuRecMutex supportStefan Hajnoczi
The polymorphic locking macros don't support QemuRecMutex yet. Add it so that lock guards can be used with QemuRecMutex. Convert TCG plugins functions that benefit from these macros. Manual qemu_rec_mutex_lock/unlock() callers are left unmodified in cases where clarity would not improve by switching to the macros. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-02-25plugins/core: add missing break in cb_to_tcg_flagsEmilio G. Cota
Fixes: 54cb65d8588 Reported-by: Robert Henry <robhenry@microsoft.com> Signed-off-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20200105072940.32204-1-cota@braap.org> Cc: qemu-stable@nongnu.org Message-Id: <20200225124710.14152-12-alex.bennee@linaro.org>
2020-01-15plugins: Include trace/mem.h in api.cRichard Henderson
Code movement in an upcoming patch will show that this file was implicitly depending on trace/mem.h being included beforehand. Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reported-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2019-11-12tcg plugins: expose an API version conceptAlex Bennée
This is a very simple versioning API which allows the plugin infrastructure to check the API a plugin was built against. We also expose a min/cur API version to the plugin via the info block in case it wants to avoid using old deprecated APIs in the future. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Robert Foley <robert.foley@linaro.org>
2019-10-28plugin: add qemu_plugin_outs helperAlex Bennée
Having the plugins grab stdout and spew stuff there is a bit ugly and certainly makes the tests look ugly. Provide a hook back into QEMU which can be redirected as needed. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Aaron Lindsay <aaron@os.amperecomputing.com>
2019-10-28plugin: add qemu_plugin_insn_disas helperAlex Bennée
Give the plugins access to the QEMU dissasembler so they don't have to re-invent the wheel. We generate a warning when there are spare bytes in the decode buffer. This is usually due to the front end loading in more bytes than decoded. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-10-28plugin: expand the plugin_init function to include an info blockAlex Bennée
This provides a limited amount of info to plugins about the guest system that will allow them to make some additional decisions on setup. Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-10-28plugin: add API symbols to qemu-plugins.symbolsEmilio G. Cota
Signed-off-by: Emilio G. Cota <cota@braap.org> [AJB: moved into plugins] Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-10-28plugins: implement helpers for resolving hwaddrAlex Bennée
We need to keep a local per-cpu copy of the data as other threads may be running. Currently we can provide insight as to if the access was IO or not and give the offset into a given device (usually the main RAMBlock). We store enough information to get details such as the MemoryRegion which might be useful in later expansions to the API. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-10-28plugin: add implementation of the apiAlex Bennée
[AJB: split from the core code commit] Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-10-28plugin: add core codeEmilio G. Cota
Signed-off-by: Emilio G. Cota <cota@braap.org> [AJB: moved directory and merged various fixes] Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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