5996fc067d
Clang will perform various compile-time diagnostics on uses of various functions (e.g. simple bounds-checking on strcpy(), etc). These diagnostics can be assigned to other functions (for example, new implementations of the string functions under CONFIG_FORTIFY_SOURCE) using the "diagnose_as_builtin" attribute. This allows those functions to retain their compile-time diagnostic warnings. Cc: Nathan Chancellor <nathan@kernel.org> Cc: llvm@lists.linux.dev Reviewed-by: Miguel Ojeda <ojeda@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220208225350.1331628-5-keescook@chromium.org Change-Id: I7062175459c03f52b2cfe05e22e4d65be8817019 Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_COMPILER_TYPES_H
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#error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
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#endif
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/* Some compiler specific definitions are overwritten here
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* for Clang compiler
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*/
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#ifdef uninitialized_var
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#undef uninitialized_var
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#define uninitialized_var(x) x = *(&(x))
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#endif
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/* same as gcc, this was present in clang-2.6 so we can assume it works
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* with any version that can compile the kernel
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*/
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#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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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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/* __no_sanitize_address has been already defined compiler-gcc.h */
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#undef __no_sanitize_address
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#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
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/* emulate gcc's __SANITIZE_ADDRESS__ flag */
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#define __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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/* Clang doesn't have a way to turn it off per-function, yet. */
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#ifdef __noretpoline
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#undef __noretpoline
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#endif
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#ifdef CONFIG_LTO_CLANG
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#ifdef CONFIG_FTRACE_MCOUNT_RECORD
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#define __norecordmcount \
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__attribute__((__section__(".text..ftrace")))
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#endif
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#define __nocfi __attribute__((no_sanitize("cfi")))
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#endif
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/*
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* Not all versions of clang implement the the type-generic versions
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* of the builtin overflow checkers. Fortunately, clang implements
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* __has_builtin allowing us to avoid awkward version
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* checks. Unfortunately, we don't know which version of gcc clang
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* pretends to be, so the macro may or may not be defined.
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*/
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#undef COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW
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#if __has_builtin(__builtin_mul_overflow) && \
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__has_builtin(__builtin_add_overflow) && \
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__has_builtin(__builtin_sub_overflow)
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#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
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#endif
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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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#else
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# define __noscs
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#endif
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/*
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* Note: the "type" argument should match any __builtin_object_size(p, type) usage.
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*
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* clang: https://clang.llvm.org/docs/AttributeReference.html#pass-object-size-pass-dynamic-object-size
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*/
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#define __pass_object_size(type) __attribute__((__pass_object_size__(type)))
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/*
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* clang: https://clang.llvm.org/docs/AttributeReference.html#overloadable
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*/
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#define __overloadable __attribute__((__overloadable__))
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/*
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* Optional: only supported since clang >= 14.0
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*
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* clang: https://clang.llvm.org/docs/AttributeReference.html#diagnose_as_builtin
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*/
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#define __diagnose_as(builtin...) __attribute__((__diagnose_as_builtin__(builtin)))
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