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kcov: move thread attach from open to start

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The current kcov code attaches a kcov object to the thread which opened
it. This is not desirable, as syzkaller opens /dev/kcov in a parent
process and passes it down to the child.

Move the thread attachment from open() time to start time.
This commit is contained in:
Matheus
2026-10-08 14:41:34 -03:00
parent d999ab7de2
commit 9a9740469f
4 changed files with 46 additions and 53 deletions
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kernel-src/sys/thread.c
+5 -9
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@@ -57,10 +57,6 @@ thread_t *sched_newthread(void *ip, size_t kstacksize, int nice, proc_t *proc, v
}
void sched_destroythread(thread_t *thread) {
#ifdef KCOV_ENABLED
if (thread->kcov)
kcov_release(thread->kcov);
#endif
mm_unmap(thread->kernelstack, thread->kernelstacksize, 0);
arch_extracontext_free(&thread->extracontext);
slab_free(thread_cache, thread);
@@ -88,6 +84,11 @@ __attribute__((noreturn)) void sched_threadexit() {
thread_t *thread = current_thread();
proc_t *proc = thread->proc;
#ifdef KCOV_ENABLED
if (thread->kcov)
kcov_set_mode(thread->kcov, KCOV_MODE_DISABLED);
#endif
mm_context_t *oldctx = thread->mmctx;
mm_switch_context(&mm_kernel_ctx);
@@ -105,11 +106,6 @@ __attribute__((noreturn)) void sched_threadexit() {
PROC_RELEASE(proc);
}
#ifdef KCOV_ENABLED
if (current_thread()->kcov)
kcov_set_mode(KCOV_MODE_DISABLED);
#endif
interrupt_set(false);
arch_context_saveandcall(threadexit_internal, current_cpu()->schedulerstack, NULL);
__builtin_unreachable();