[PATCH 6.6.y 0/5] fix error handling in mmap_region() and refactor (hotfixes)
From: Lorenzo Stoakes
Date: Fri Nov 15 2024 - 07:42:39 EST
Critical fixes for mmap_region(), backported to 6.6.y.
Some notes on differences from upstream:
* In this kernel is_shared_maywrite() does not exist and the code uses
VM_SHARED to determine whether mapping_map_writable() /
mapping_unmap_writable() should be invoked. This backport therefore
follows suit.
* Each version of these series is confronted by a slightly different
mmap_region(), so we must adapt the change for each stable version. The
approach remains the same throughout, however, and we correctly avoid
closing the VMA part way through any __mmap_region() operation.
Lorenzo Stoakes (5):
mm: avoid unsafe VMA hook invocation when error arises on mmap hook
mm: unconditionally close VMAs on error
mm: refactor map_deny_write_exec()
mm: refactor arch_calc_vm_flag_bits() and arm64 MTE handling
mm: resolve faulty mmap_region() error path behaviour
arch/arm64/include/asm/mman.h | 10 ++-
arch/parisc/include/asm/mman.h | 5 +-
include/linux/mman.h | 28 ++++++--
mm/internal.h | 45 ++++++++++++
mm/mmap.c | 128 ++++++++++++++++++---------------
mm/mprotect.c | 2 +-
mm/nommu.c | 9 ++-
mm/shmem.c | 3 -
8 files changed, 153 insertions(+), 77 deletions(-)
--
2.47.0