6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Donet Tom donettom@linux.ibm.com
commit 76503e1fa1a53ef041a120825d5ce81c7fe7bdd7 upstream.
The hmm2 double_map test was failing due to an incorrect buffer->mirror size. The buffer->mirror size was 6, while buffer->ptr size was 6 * PAGE_SIZE. The test failed because the kernel's copy_to_user function was attempting to copy a 6 * PAGE_SIZE buffer to buffer->mirror. Since the size of buffer->mirror was incorrect, copy_to_user failed.
This patch corrects the buffer->mirror size to 6 * PAGE_SIZE.
Test Result without this patch ============================== # RUN hmm2.hmm2_device_private.double_map ... # hmm-tests.c:1680:double_map:Expected ret (-14) == 0 (0) # double_map: Test terminated by assertion # FAIL hmm2.hmm2_device_private.double_map not ok 53 hmm2.hmm2_device_private.double_map
Test Result with this patch =========================== # RUN hmm2.hmm2_device_private.double_map ... # OK hmm2.hmm2_device_private.double_map ok 53 hmm2.hmm2_device_private.double_map
Link: https://lkml.kernel.org/r/20240927050752.51066-1-donettom@linux.ibm.com Fixes: fee9f6d1b8df ("mm/hmm/test: add selftests for HMM") Signed-off-by: Donet Tom donettom@linux.ibm.com Reviewed-by: Muhammad Usama Anjum usama.anjum@collabora.com Cc: Jérôme Glisse jglisse@redhat.com Cc: Kees Cook keescook@chromium.org Cc: Mark Brown broonie@kernel.org Cc: Przemek Kitszel przemyslaw.kitszel@intel.com Cc: Ritesh Harjani (IBM) ritesh.list@gmail.com Cc: Shuah Khan shuah@kernel.org Cc: Ralph Campbell rcampbell@nvidia.com Cc: Jason Gunthorpe jgg@mellanox.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/testing/selftests/mm/hmm-tests.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/testing/selftests/mm/hmm-tests.c +++ b/tools/testing/selftests/mm/hmm-tests.c @@ -1657,7 +1657,7 @@ TEST_F(hmm2, double_map)
buffer->fd = -1; buffer->size = size; - buffer->mirror = malloc(npages); + buffer->mirror = malloc(size); ASSERT_NE(buffer->mirror, NULL);
/* Reserve a range of addresses. */