Commit cb68c255 authored Nov 18, 2022 by Suren Baghdasaryan Committed by Gerrit - the friendly Code Review server Feb 16, 2023

ANDROID: mm: prevent speculative page fault handling for in do_swap_page()



do_swap_page() uses migration_entry_wait() which operates on page tables
without protection. Disable speculative page fault handling.

Bug: 257443051
Change-Id: I677eb1ee85707dce533d5d811dcde5f5dabcfdf3
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Git-commit: 4b388752aca20f2588212251ad59d80a2cc5d214
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Srinivasarao Pathipati <quic_c_spathi@quicinc.com>

parent b12d6d95

mm/memory.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -3050,6 +3050,11 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
		int exclusive = 0;
		vm_fault_t ret;

		if (vmf->flags & FAULT_FLAG_SPECULATIVE) {
		pte_unmap(vmf->pte);
		return VM_FAULT_RETRY;
		}

		ret = pte_unmap_same(vmf);
		if (ret) {
		/*