* Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx> [241115 07:42]: > 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 These backports look good. Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> > > 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
