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kcov: initial implementation

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Implement a device (/dev/kcov) that exposes coverage info for the
kernel. This will be especially useful for coverage-based fuzzing (e.g.
syzkaller).

Exclude a lot of functions which would crash/otherwise interfere in the
coverage, including only processing coverage callbacks when not handling
an irq.
This commit is contained in:
Matheus
2026-10-06 11:05:58 -03:00
parent 111a8696d8
commit e4a4896b4b
14 changed files with 581 additions and 25 deletions
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kernel-src/Makefile
+4
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@@ -14,8 +14,12 @@ UACPIINCDIR=$(shell pwd)/io/acpi/uacpi/include
U80211INCDIR=$(shell pwd)/io/net/u80211/include
U80211DRVINCDIR=$(shell pwd)/io/net/u80211_drv/include
UACPIOPTS=-DUACPI_OVERRIDE_LIBC -DUACPI_KERNEL_INITIALIZATION -DUACPI_NATIVE_ALLOC_ZEROED
KCOV_ENABLED=n
KERNELCONFIG=-DX86_64_ENABLE_E9 #-DSYSCALL_LOGGING #-DENABLE_PROFILING
CFLAGS=-g -ffreestanding -mcmodel=kernel -O2 -mno-red-zone -mgeneral-regs-only -mno-mmx -mno-sse -mno-sse2 -nostdlib -Wall -MMD -I "$(INCDIR)" -I "$(ARCHINCDIR)" -I "$(FLANTERMINCDIR)" -I "$(UACPIINCDIR)" -I "$(U80211INCDIR)" -I"$(U80211DRVINCDIR)" $(UACPIOPTS) $(PRINTFOPTS) $(KERNELCONFIG) $(FLANTERMOPTS) -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -std=gnu17 -Wno-error=implicit-function-declaration
ifeq ($(KCOV_ENABLED),y)
CFLAGS += -DKCOV_ENABLED -fsanitize-coverage=trace-pc,trace-cmp
endif
ASFLAGS=-felf64
DEPS=$(CSOURCES:.c=.d)