mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-01-04 22:54:56 +01:00
9591fdb061
Pull more x86 updates from Borislav Petkov: - Remove a bunch of asm implementing condition flags testing in KVM's emulator in favor of int3_emulate_jcc() which is written in C - Replace KVM fastops with C-based stubs which avoids problems with the fastop infra related to latter not adhering to the C ABI due to their special calling convention and, more importantly, bypassing compiler control-flow integrity checking because they're written in asm - Remove wrongly used static branches and other ugliness accumulated over time in hyperv's hypercall implementation with a proper static function call to the correct hypervisor call variant - Add some fixes and modifications to allow running FRED-enabled kernels in KVM even on non-FRED hardware - Add kCFI improvements like validating indirect calls and prepare for enabling kCFI with GCC. Add cmdline params documentation and other code cleanups - Use the single-byte 0xd6 insn as the official #UD single-byte undefined opcode instruction as agreed upon by both x86 vendors - Other smaller cleanups and touchups all over the place * tag 'x86_core_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (24 commits) x86,retpoline: Optimize patch_retpoline() x86,ibt: Use UDB instead of 0xEA x86/cfi: Remove __noinitretpoline and __noretpoline x86/cfi: Add "debug" option to "cfi=" bootparam x86/cfi: Standardize on common "CFI:" prefix for CFI reports x86/cfi: Document the "cfi=" bootparam options x86/traps: Clarify KCFI instruction layout compiler_types.h: Move __nocfi out of compiler-specific header objtool: Validate kCFI calls x86/fred: KVM: VMX: Always use FRED for IRQs when CONFIG_X86_FRED=y x86/fred: Play nice with invoking asm_fred_entry_from_kvm() on non-FRED hardware x86/fred: Install system vector handlers even if FRED isn't fully enabled x86/hyperv: Use direct call to hypercall-page x86/hyperv: Clean up hv_do_hypercall() KVM: x86: Remove fastops KVM: x86: Convert em_salc() to C KVM: x86: Introduce EM_ASM_3WCL KVM: x86: Introduce EM_ASM_1SRC2 KVM: x86: Introduce EM_ASM_2CL KVM: x86: Introduce EM_ASM_2W ...
156 lines
5.0 KiB
C
156 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_COMPILER_TYPES_H
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#error "Please do not include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
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#endif
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/* Compiler specific definitions for Clang compiler */
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/*
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* Clang prior to 17 is being silly and considers many __cleanup() variables
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* as unused (because they are, their sole purpose is to go out of scope).
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*
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* https://github.com/llvm/llvm-project/commit/877210faa447f4cc7db87812f8ed80e398fedd61
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*/
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#undef __cleanup
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#define __cleanup(func) __maybe_unused __attribute__((__cleanup__(func)))
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/* all clang versions usable with the kernel support KASAN ABI version 5 */
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#define KASAN_ABI_VERSION 5
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/*
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* Clang 22 added preprocessor macros to match GCC, in hopes of eventually
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* dropping __has_feature support for sanitizers:
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* https://github.com/llvm/llvm-project/commit/568c23bbd3303518c5056d7f03444dae4fdc8a9c
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* Create these macros for older versions of clang so that it is easy to clean
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* up once the minimum supported version of LLVM for building the kernel always
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* creates these macros.
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*
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* Note: Checking __has_feature(*_sanitizer) is only true if the feature is
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* enabled. Therefore it is not required to additionally check defined(CONFIG_*)
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* to avoid adding redundant attributes in other configurations.
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*/
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#if __has_feature(address_sanitizer) && !defined(__SANITIZE_ADDRESS__)
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#define __SANITIZE_ADDRESS__
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#endif
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#if __has_feature(hwaddress_sanitizer) && !defined(__SANITIZE_HWADDRESS__)
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#define __SANITIZE_HWADDRESS__
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#endif
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#if __has_feature(thread_sanitizer) && !defined(__SANITIZE_THREAD__)
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#define __SANITIZE_THREAD__
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#endif
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/*
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* Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel.
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*/
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#ifdef __SANITIZE_HWADDRESS__
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#define __SANITIZE_ADDRESS__
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#endif
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#ifdef __SANITIZE_ADDRESS__
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#define __no_sanitize_address \
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__attribute__((no_sanitize("address", "hwaddress")))
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#else
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#define __no_sanitize_address
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#endif
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#ifdef __SANITIZE_THREAD__
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#define __no_sanitize_thread \
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__attribute__((no_sanitize("thread")))
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#else
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#define __no_sanitize_thread
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#endif
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#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
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#define __HAVE_BUILTIN_BSWAP32__
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#define __HAVE_BUILTIN_BSWAP64__
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#define __HAVE_BUILTIN_BSWAP16__
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#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
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#if __has_feature(undefined_behavior_sanitizer)
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/* GCC does not have __SANITIZE_UNDEFINED__ */
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#define __no_sanitize_undefined \
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__attribute__((no_sanitize("undefined")))
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#else
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#define __no_sanitize_undefined
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#endif
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#if __has_feature(memory_sanitizer)
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#define __SANITIZE_MEMORY__
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/*
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* Unlike other sanitizers, KMSAN still inserts code into functions marked with
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* no_sanitize("kernel-memory"). Using disable_sanitizer_instrumentation
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* provides the behavior consistent with other __no_sanitize_ attributes,
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* guaranteeing that __no_sanitize_memory functions remain uninstrumented.
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*/
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#define __no_sanitize_memory __disable_sanitizer_instrumentation
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/*
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* The __no_kmsan_checks attribute ensures that a function does not produce
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* false positive reports by:
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* - initializing all local variables and memory stores in this function;
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* - skipping all shadow checks;
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* - passing initialized arguments to this function's callees.
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*/
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#define __no_kmsan_checks __attribute__((no_sanitize("kernel-memory")))
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#else
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#define __no_sanitize_memory
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#define __no_kmsan_checks
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#endif
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/*
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* Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
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* with no_sanitize("coverage"). Prior versions of Clang support coverage
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* instrumentation, but cannot be queried for support by the preprocessor.
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*/
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#if __has_feature(coverage_sanitizer)
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#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
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#else
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#define __no_sanitize_coverage
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#endif
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/* Only Clang needs to disable the coverage sanitizer for kstack_erase. */
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#define __no_kstack_erase __no_sanitize_coverage
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#if __has_feature(shadow_call_stack)
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# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
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#endif
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/*
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* Turn individual warnings and errors on and off locally, depending
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* on version.
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*/
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#define __diag_clang(version, severity, s) \
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__diag_clang_ ## version(__diag_clang_ ## severity s)
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/* Severity used in pragma directives */
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#define __diag_clang_ignore ignored
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#define __diag_clang_warn warning
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#define __diag_clang_error error
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#define __diag_str1(s) #s
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#define __diag_str(s) __diag_str1(s)
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#define __diag(s) _Pragma(__diag_str(clang diagnostic s))
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#define __diag_clang_13(s) __diag(s)
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#define __diag_ignore_all(option, comment) \
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__diag_clang(13, ignore, option)
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/*
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* clang has horrible behavior with "g" or "rm" constraints for asm
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* inputs, turning them into something worse than "m". Avoid using
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* constraints with multiple possible uses (but "ir" seems to be ok):
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*
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* https://github.com/llvm/llvm-project/issues/20571
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*/
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#define ASM_INPUT_G "ir"
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#define ASM_INPUT_RM "r"
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/*
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* Declare compiler support for __typeof_unqual__() operator.
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*
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* Bindgen uses LLVM even if our C compiler is GCC, so we cannot
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* rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL.
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*/
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#define CC_HAS_TYPEOF_UNQUAL (__clang_major__ >= 19)
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