The patch titled
Subject: userfaultfd: non-cooperative: notify about unmap of destination during mremap
has been removed from the -mm tree. Its filename was
userfaultfd-non-cooperative-notify-about-unmap-of-destination-during-mremap.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Subject: userfaultfd: non-cooperative: notify about unmap of destination during mremap
When mremap is called with MREMAP_FIXED it unmaps memory at the
destination address without notifying userfaultfd monitor. If the
destination were registered with userfaultfd, the monitor has no way to
distinguish between the old and new ranges and to properly relate the page
faults that would occur in the destination region.
Fixes: 897ab3e0c49e ("userfaultfd: non-cooperative: add event for memory unmaps")
Link: http://lkml.kernel.org/r/1500276876-3350-1-git-send-email-rppt@xxxxxxxxxxxxxxxxxx
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Acked-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mremap.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff -puN mm/mremap.c~userfaultfd-non-cooperative-notify-about-unmap-of-destination-during-mremap mm/mremap.c
--- a/mm/mremap.c~userfaultfd-non-cooperative-notify-about-unmap-of-destination-during-mremap
+++ a/mm/mremap.c
@@ -429,6 +429,7 @@ static struct vm_area_struct *vma_to_res
static unsigned long mremap_to(unsigned long addr, unsigned long old_len,
unsigned long new_addr, unsigned long new_len, bool *locked,
struct vm_userfaultfd_ctx *uf,
+ struct list_head *uf_unmap_early,
struct list_head *uf_unmap)
{
struct mm_struct *mm = current->mm;
@@ -447,7 +448,7 @@ static unsigned long mremap_to(unsigned
if (addr + old_len > new_addr && new_addr + new_len > addr)
goto out;
- ret = do_munmap(mm, new_addr, new_len, NULL);
+ ret = do_munmap(mm, new_addr, new_len, uf_unmap_early);
if (ret)
goto out;
@@ -515,6 +516,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, a
unsigned long charged = 0;
bool locked = false;
struct vm_userfaultfd_ctx uf = NULL_VM_UFFD_CTX;
+ LIST_HEAD(uf_unmap_early);
LIST_HEAD(uf_unmap);
if (flags & ~(MREMAP_FIXED | MREMAP_MAYMOVE))
@@ -542,7 +544,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, a
if (flags & MREMAP_FIXED) {
ret = mremap_to(addr, old_len, new_addr, new_len,
- &locked, &uf, &uf_unmap);
+ &locked, &uf, &uf_unmap_early, &uf_unmap);
goto out;
}
@@ -622,6 +624,7 @@ out:
up_write(¤t->mm->mmap_sem);
if (locked && new_len > old_len)
mm_populate(new_addr + old_len, new_len - old_len);
+ userfaultfd_unmap_complete(mm, &uf_unmap_early);
mremap_userfaultfd_complete(&uf, addr, new_addr, old_len);
userfaultfd_unmap_complete(mm, &uf_unmap);
return ret;
_
Patches currently in -mm which might be from rppt@xxxxxxxxxxxxxxxxxx are
shmem-shmem_charge-verify-max_block-is-not-exceeded-before-inode-update.patch
shmem-introduce-shmem_inode_acct_block.patch
userfaultfd-shmem-add-shmem_mfill_zeropage_pte-for-userfaultfd-support.patch
userfaultfd-mcopy_atomic-introduce-mfill_atomic_pte-helper.patch
userfaultfd-shmem-wire-up-shmem_mfill_zeropage_pte.patch
userfaultfd-report-uffdio_zeropage-as-available-for-shmem-vmas.patch
userfaultfd-selftest-enable-testing-of-uffdio_zeropage-for-shmem.patch