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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-25 11:51:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-25 11:51:21 +0300 |
| commit | 7f0020417b7bceaa10cf9e1efe2b3f5c554d972e (patch) | |
| tree | 69d11757acfb4bacfb5f82f6f0fbf04339b3cd38 /mm/userfaultfd.c | |
| parent | 616e143c9fd88562b4d2cb235834c620fe65ba22 (diff) | |
| parent | ea061bad207e1ba693b5488ba64c663f7ca03f50 (diff) | |
| download | linux-rolling-stable.tar.xz | |
Merge v6.14.4linux-rolling-stable
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/userfaultfd.c')
| -rw-r--r-- | mm/userfaultfd.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index d06453fa8aba..4295a599d714 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -1898,6 +1898,14 @@ struct vm_area_struct *userfaultfd_clear_vma(struct vma_iterator *vmi, unsigned long end) { struct vm_area_struct *ret; + bool give_up_on_oom = false; + + /* + * If we are modifying only and not splitting, just give up on the merge + * if OOM prevents us from merging successfully. + */ + if (start == vma->vm_start && end == vma->vm_end) + give_up_on_oom = true; /* Reset ptes for the whole vma range if wr-protected */ if (userfaultfd_wp(vma)) @@ -1905,7 +1913,7 @@ struct vm_area_struct *userfaultfd_clear_vma(struct vma_iterator *vmi, ret = vma_modify_flags_uffd(vmi, prev, vma, start, end, vma->vm_flags & ~__VM_UFFD_FLAGS, - NULL_VM_UFFD_CTX); + NULL_VM_UFFD_CTX, give_up_on_oom); /* * In the vma_merge() successful mprotect-like case 8: @@ -1956,7 +1964,8 @@ int userfaultfd_register_range(struct userfaultfd_ctx *ctx, new_flags = (vma->vm_flags & ~__VM_UFFD_FLAGS) | vm_flags; vma = vma_modify_flags_uffd(&vmi, prev, vma, start, vma_end, new_flags, - (struct vm_userfaultfd_ctx){ctx}); + (struct vm_userfaultfd_ctx){ctx}, + /* give_up_on_oom = */false); if (IS_ERR(vma)) return PTR_ERR(vma); |