[v4,0/2] Fix issues with vmalloc flush flag

Message

Rick Edgecombe May 21, 2019, 8:51 p.m. UTC

These two patches address issues with the recently added
VM_FLUSH_RESET_PERMS vmalloc flag.

Patch 1 is the most critical and addresses an issue that could cause a
crash on x86.

Patch 2 addresses an issue where in a rare case strange arguments
could be provided to flush_tlb_kernel_range(). Most arch's should be
fine with it, but some may not like them, so we should avoid doing
this.

v3->v4:
 - Drop patch that switched vm_unmap_alias() calls to regular flush
 - Add patch to address correctness previously fixed in dropped patch

v2->v3:
 - Split into two patches

v1->v2:
 - Update commit message with more detail
 - Fix flush end range on !CONFIG_ARCH_HAS_SET_DIRECT_MAP case

Rick Edgecombe (2):
  vmalloc: Fix calculation of direct map addr range
  vmalloc: Avoid rare case of flushing tlb with weird arguements

 mm/vmalloc.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)