x86,traps: #DF IST stack has to be mapped in user page tables

In order to handle #DF triggered by usermode, the IST stack needs to be present in the user pagetables. Signed-off-by: Pawel Wieczorkiewicz <[email protected]>
KernelTestFramework · Aug 24, 2023 · 0fbcdca · 0fbcdca
1 parent c351a82
commit 0fbcdca
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/arch/x86/traps.c b/arch/x86/traps.c
@@ -67,7 +67,7 @@ static void init_tss(percpu_t *percpu) {
     percpu->tss.cr3 = _ul(cr3.reg);
 #elif defined(__x86_64__)
     percpu->tss.rsp0 = _ul(get_free_page_top(GFP_KERNEL | GFP_USER));
-    percpu->tss.ist[0] = _ul(get_free_page_top(GFP_KERNEL));
+    percpu->tss.ist[0] = _ul(get_free_page_top(GFP_KERNEL | GFP_USER));
 #endif
     percpu->tss.iopb = sizeof(percpu->tss);