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

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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>
This commit is contained in:
Suren Baghdasaryan 2022-11-18 15:23:53 -08:00 • committed by Gerrit - the friendly Code Review server
commit cb68c255f8
1 changed files with 5 additions and 0 deletions
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5
mm/memory.c
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@ -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) {
/*