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b=Go2tvX9vIXO8EQ7FnchajHLDwJAyDeUd2ba9pglp4R8p4TfPwtbTRxvwWW8nAex8z riJFtzogQZha0TsAVk6oEpL5fa6Q1IDjFFZirOhY2UxemaonhgAqvut8CQ/gE4f7Ne SNMgJq17zo4XkmuluRT1n2FCChbhIcTWBPfI4smS2mjYs+MYHr+t6PhRWSL5lbEoMB SSpZZ4DBKE6SvQPew1OX2ROC5OgUOLteIWDz+pX4rV5+DgXIFzIDztY/h21VJNhvNB reMVhu3ewxbXcTdsYDbJvmYi0jwjpJX4QNxMcI4tvAP7WwQGRDBznGTwfm8N7onmLv 3C3Pz6cKJsRPg== From: Pratyush Yadav To: Pasha Tatashin , Mike Rapoport , Pratyush Yadav , Shuah Khan , Andrew Morton , Usama Arif Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, Pratyush Yadav Subject: [PATCH v2 3/6] selftests/liveupdate: add test for memfd content preservation Date: Fri, 3 Apr 2026 19:40:09 +0000 Message-ID: <20260403194014.3704180-4-pratyush@kernel.org> X-Mailer: git-send-email 2.53.0.1213.gd9a14994de-goog In-Reply-To: <20260403194014.3704180-1-pratyush@kernel.org> References: <20260403194014.3704180-1-pratyush@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: B1826180005 X-Stat-Signature: nigjso7mudgpqr5hh6kwkgywtu4g8tc8 X-Rspamd-Server: rspam06 X-HE-Tag: 1775245233-591550 X-HE-Meta: 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 PU3UInPZ /meehlHH8W/Y1lJMALEG9/XNI1xSXQyG4c+CJbSzolzg2Qzz0YJnCzqcBbq082SSLcZL6n+TDJ3UW6euZIRMCc9dlhrmRWYl6aBYd8dZR8zfj6dj24Z1OCSkLBItb92K0JVvA3kcRx+VN8tZImHgJZnuH5xJ6FACzB1flO2D5qHZHtL441D8rfWo4GCX9Ojn9ceAsg8nOG3lPaWYlQKftIKnn9rrVgp5aHrZrmqT8ux001K+snhg7gAzakHim4sRfwMMQ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: "Pratyush Yadav (Google)" Add a selftest that makes sure the contents of a memfd are correctly preserved across a live update. In stage 1, create a memfd and fill it with random data, and preserve it. Save the random data to the file system. This will be used by stage 2 to verify the contents are correct. In stage 2, retrieve the memfd and compare its contents with the contents saved on the file system. Signed-off-by: Pratyush Yadav Signed-off-by: Pratyush Yadav (Google) --- tools/testing/selftests/liveupdate/Makefile | 1 + .../testing/selftests/liveupdate/luo_memfd.c | 80 +++++++++++++++++++ 2 files changed, 81 insertions(+) diff --git a/tools/testing/selftests/liveupdate/Makefile b/tools/testing/selftests/liveupdate/Makefile index 051daae55eec..8e2eb6500c07 100644 --- a/tools/testing/selftests/liveupdate/Makefile +++ b/tools/testing/selftests/liveupdate/Makefile @@ -13,6 +13,7 @@ TEST_FILES += do_kexec.sh include ../lib.mk CFLAGS += $(KHDR_INCLUDES) +CFLAGS += -I$(top_srcdir)/tools/include CFLAGS += -Wall -O2 -Wno-unused-function CFLAGS += -MD diff --git a/tools/testing/selftests/liveupdate/luo_memfd.c b/tools/testing/selftests/liveupdate/luo_memfd.c index 47d2c3163b62..70eb96950f04 100644 --- a/tools/testing/selftests/liveupdate/luo_memfd.c +++ b/tools/testing/selftests/liveupdate/luo_memfd.c @@ -3,6 +3,9 @@ /* * Copyright (c) 2026, Google LLC. * Pratyush Yadav (Google) + * + * Copyright (C) 2025 Amazon.com Inc. or its affiliates. + * Pratyush Yadav */ /* @@ -11,11 +14,14 @@ #include #include +#include #include #include +#include #include #include +#include #include "../kselftest.h" #include "../kselftest_harness.h" @@ -25,9 +31,83 @@ #define STATE_SESSION_NAME "luo-state" #define STATE_MEMFD_TOKEN 1 +#define MEMFD_DATA_SESSION_NAME "memfd_data_session" +#define MEMFD_DATA_TOKEN 1 +#define MEMFD_DATA_BUFFER_SIZE SZ_1M +#define MEMFD_DATA_FS_COPY "memfd_data_fs_copy.bin" + static int luo_fd = -1; static int stage; +static void memfd_data_stage_1(struct __test_metadata *_metadata) +{ + int fd, session; + char *buffer; + struct liveupdate_session_preserve_fd preserve_arg = { .size = sizeof(preserve_arg) }; + + buffer = malloc(MEMFD_DATA_BUFFER_SIZE); + ASSERT_NE(buffer, NULL); + + session = luo_create_session(luo_fd, MEMFD_DATA_SESSION_NAME); + ASSERT_GE(session, 0); + + fd = create_random_memfd("memfd_data", buffer, MEMFD_DATA_BUFFER_SIZE); + ASSERT_GE(fd, 0); + + ASSERT_EQ(save_test_data(MEMFD_DATA_FS_COPY, buffer, MEMFD_DATA_BUFFER_SIZE), 0); + + preserve_arg.fd = fd; + preserve_arg.token = MEMFD_DATA_TOKEN; + ASSERT_GE(ioctl(session, LIVEUPDATE_SESSION_PRESERVE_FD, &preserve_arg), 0); + + daemonize_and_wait(); +} + +static void memfd_data_stage_2(struct __test_metadata *_metadata) +{ + int fd, session; + char *buffer; + struct liveupdate_session_retrieve_fd retrieve_arg = { .size = sizeof(retrieve_arg) }; + + buffer = malloc(MEMFD_DATA_BUFFER_SIZE); + ASSERT_NE(buffer, NULL); + + session = luo_retrieve_session(luo_fd, MEMFD_DATA_SESSION_NAME); + ASSERT_GE(session, 0); + + ASSERT_EQ(load_test_data(MEMFD_DATA_FS_COPY, buffer, MEMFD_DATA_BUFFER_SIZE), 0); + + retrieve_arg.token = MEMFD_DATA_TOKEN; + ASSERT_GE(ioctl(session, LIVEUPDATE_SESSION_RETRIEVE_FD, &retrieve_arg), 0); + fd = retrieve_arg.fd; + ASSERT_GE(fd, 0); + + ASSERT_EQ(verify_fd_content_read(fd, buffer, MEMFD_DATA_BUFFER_SIZE), 0); + + ASSERT_EQ(luo_session_finish(session), 0); +} + +/* + * Test that a memfd with its data is preserved across live update. + */ +TEST(memfd_data) +{ + if (cwd_is_tmpfs()) + SKIP(return, "test saves data to rootfs, cannot run on tmpfs"); + + switch (stage) { + case 1: + memfd_data_stage_1(_metadata); + break; + case 2: + memfd_data_stage_2(_metadata); + break; + default: + TH_LOG("Unknown stage %d\n", stage); + ASSERT_FALSE(true); + } +} + int main(int argc, char *argv[]) { int expected_stage = 0; -- 2.53.0.1213.gd9a14994de-goog