android/android_kernel_samsung_sm8650
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ANDROID: mm: add missing check in the backport for handling faults under VMA lock

Browse Source 
While backporting, a check for vma locking inside do_wp_page() was
missed. Add it.

Fixes: 3ebafb7b46 ("BACKPORT: FROMGIT: mm: handle faults that merely update the accessed bit under the VMA lock")
Bug: 293665307
Change-Id: Ibd7f21ae8fec7b8edc6e3d88954714b5fad41516
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Suren Baghdasaryan 2023-09-29 16:08:21 -07:00
parent 1fe248991f
commit 4fcc13c1ff
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
mm/memory.c
View File

@ -3500,6 +3500,12 @@ static vm_fault_t do_wp_page(struct vm_fault *vmf)
return wp_page_shared(vmf);
}
copy:
if ((vmf->flags & FAULT_FLAG_VMA_LOCK) && !vma->anon_vma) {
pte_unmap_unlock(vmf->pte, vmf->ptl);
vma_end_read(vmf->vma);
return VM_FAULT_RETRY;
}
/*
* Ok, we need to copy. Oh, well..
*/