From: Vincent Donnefort Date: Wed, 18 Dec 2024 17:03:18 +0000 (+0000) Subject: selftests/ring-buffer: Add test for out-of-bound pgoff mapping X-Git-Tag: v6.14-rc1~143^2~8 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b6f9cd83c60ebb48f580dd0ec9e9080590ebc053;p=thirdparty%2Fkernel%2Flinux.git selftests/ring-buffer: Add test for out-of-bound pgoff mapping Extend the ring-buffer mapping test coverage by checking an out-of-bound pgoff which has proven to be problematic in the past. Link: https://lore.kernel.org/r/20241218170318.2814991-1-vdonnefort@google.com Cc: Shuah Khan Cc: linux-kselftest@vger.kernel.org Signed-off-by: Vincent Donnefort Signed-off-by: Shuah Khan --- diff --git a/tools/testing/selftests/ring-buffer/map_test.c b/tools/testing/selftests/ring-buffer/map_test.c index d10a847130fbc..a58f520f2f41a 100644 --- a/tools/testing/selftests/ring-buffer/map_test.c +++ b/tools/testing/selftests/ring-buffer/map_test.c @@ -233,12 +233,18 @@ TEST_F(map, data_mmap) ASSERT_NE(data, MAP_FAILED); munmap(data, data_len); - /* Overflow the available subbufs by 1 */ + /* Offset within ring-buffer bounds, mapping size overflow */ meta_len += desc->meta->subbuf_size * 2; data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, desc->cpu_fd, meta_len); ASSERT_EQ(data, MAP_FAILED); + /* Offset outside ring-buffer bounds */ + data_len = desc->meta->subbuf_size * desc->meta->nr_subbufs; + data = mmap(NULL, data_len, PROT_READ, MAP_SHARED, + desc->cpu_fd, data_len + (desc->meta->subbuf_size * 2)); + ASSERT_EQ(data, MAP_FAILED); + /* Verify meta-page padding */ if (desc->meta->meta_page_size > getpagesize()) { data_len = desc->meta->meta_page_size;