[0/2] mm: Fixes on pte markers

Message

Peter Xu Dec. 14, 2022, 8:04 p.m. UTC

Patch 1 resolves the syzkiller report from Pengfei.

Patch 2 further harden pte markers when used with the recent swapin error
markers.  The major case is we should persist a swapin error marker after
fork(), so child shouldn't read a corrupted page.

No report so far with patch 2, but it can be somehow tested with things
like:
https://github.com/xzpeter/clibs/blob/master/misc/pageout.c
Plus some hacks.

Please have a look, thanks.

Peter Xu (2):
  mm/uffd: Fix pte marker when fork() without fork event
  mm: Fix a few rare cases of using swapin error pte marker

 mm/hugetlb.c  |  3 +++
 mm/memory.c   | 14 +++++++-------
 mm/mprotect.c |  8 +++++++-
 3 files changed, 17 insertions(+), 8 deletions(-)