diff options
author | Muchun Song <songmuchun@bytedance.com> | 2022-03-22 14:42:08 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-15 19:41:58 +0200 |
commit | 259dfb503b8f4087898403faf0e76dcb8d232e3d (patch) | |
tree | b60cf9f524f365ed142b73e6b154d95bd7c5c572 /certs | |
parent | 5ca7aa4331009b08f9c81a6309ae5e69cd9011b2 (diff) |
mm: userfaultfd: fix missing cache flush in mcopy_atomic_pte() and __mcopy_atomic()
commit 7c25a0b89a487878b0691e6524fb5a8827322194 upstream.
userfaultfd calls mcopy_atomic_pte() and __mcopy_atomic() which do not
do any cache flushing for the target page. Then the target page will be
mapped to the user space with a different address (user address), which
might have an alias issue with the kernel address used to copy the data
from the user to. Fix this by insert flush_dcache_page() after
copy_from_user() succeeds.
Link: https://lkml.kernel.org/r/20220210123058.79206-7-songmuchun@bytedance.com
Fixes: b6ebaedb4cb1 ("userfaultfd: avoid mmap_sem read recursion in mcopy_atomic")
Fixes: c1a4de99fada ("userfaultfd: mcopy_atomic|mfill_zeropage: UFFDIO_COPY|UFFDIO_ZEROPAGE preparation")
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Fam Zheng <fam.zheng@bytedance.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Lars Persson <lars.persson@axis.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'certs')
0 files changed, 0 insertions, 0 deletions