mm/mprotect: fix do_mprotect_pkey() limit check

commit 77795f900e upstream.

The return of do_mprotect_pkey() can still be incorrectly returned as
success if there is a gap that spans to or beyond the end address passed
in.  Update the check to ensure that the end address has indeed been seen.

Link: https://lore.kernel.org/all/CABi2SkXjN+5iFoBhxk71t3cmunTk-s=rB4T7qo0UQRh17s49PQ@mail.gmail.com/
Link: https://lkml.kernel.org/r/20230606182912.586576-1-Liam.Howlett@oracle.com
Fixes: 82f951340f ("mm/mprotect: fix do_mprotect_pkey() return on error")
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: Jeff Xu <jeffxu@chromium.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This commit is contained in:

Liam R. Howlett

2023-06-06 14:29:12 -04:00

committed by

Greg Kroah-Hartman

parent c189994b5d

commit b6e15f5940

1 changed files with 1 additions and 1 deletions

									
										2

mm/mprotect.c

										View File
									
				@ -838,7 +838,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len,

					}

					tlb_finish_mmu(&tlb);

					if (!error && vma_iter_end(&vmi) < end)

					if (!error && tmp < end)

						error = -ENOMEM;

				out:

mm/mprotect: fix do_mprotect_pkey() limit check

2 mm/mprotect.c Unescape Escape View File

2

mm/mprotect.c

View File