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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/arch/x86-64/smp.c
+3 -2
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@@ -9,6 +9,7 @@
#include <kernel/alloc.h>
#include <kernel/init.h>
#include <arch/context.h>
#include <kernel/kcov.h>
#include <arch/prof.h>
DEFINE_KERNEL_ARGUMENT(nosmp, bool);
@@ -21,12 +22,12 @@ static volatile struct limine_mp_request smprequest = {
size_t arch_smp_cpusawake = 1;
// for panic. if the nosmp argument is given to the kernel, this is what the APs will jump to
static void cpuwakeuphalt(struct limine_mp_info *info) {
KCOV_DISABLED static void cpuwakeuphalt(struct limine_mp_info *info) {
asm("cli");
for (;;) CPU_HALT();
}
static void cpuwakeup(struct limine_mp_info *info) {
KCOV_DISABLED static void cpuwakeup(struct limine_mp_info *info) {
cpu_set((cpu_t *)info->extra_argument);
arch_gdt_reload();