diff options
| author | Pasha Tatashin <pasha.tatashin@soleen.com> | 2026-03-26 16:39:43 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-04-18 00:10:49 -0700 |
| commit | e3e613a33e654a37c4fb34b7eb2776008c461e0c (patch) | |
| tree | ad486f5448f16e2571eb79e0606e0edd9bcc2e3d /tools | |
| parent | bc3a5763f4664c5da812eb3f14d55b0c99abd4ab (diff) | |
selftests: liveupdate: add test for double preservation
Verify that a file can only be preserved once across all active sessions.
Attempting to preserve it a second time, whether in the same or a
different session, should fail with EBUSY.
Link: https://lore.kernel.org/20260326163943.574070-4-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Cc: David Matlack <dmatlack@google.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/liveupdate/liveupdate.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/tools/testing/selftests/liveupdate/liveupdate.c b/tools/testing/selftests/liveupdate/liveupdate.c index c2878e3d5ef9..37c808fbe1e9 100644 --- a/tools/testing/selftests/liveupdate/liveupdate.c +++ b/tools/testing/selftests/liveupdate/liveupdate.c @@ -345,4 +345,45 @@ TEST_F(liveupdate_device, preserve_unsupported_fd) ASSERT_EQ(close(session_fd), 0); } +/* + * Test Case: Prevent Double Preservation + * + * Verifies that a file (memfd) can only be preserved once across all active + * sessions. Attempting to preserve it a second time, whether in the same or + * a different session, should fail with EBUSY. + */ +TEST_F(liveupdate_device, prevent_double_preservation) +{ + int session_fd1, session_fd2, mem_fd; + int ret; + + self->fd1 = open(LIVEUPDATE_DEV, O_RDWR); + if (self->fd1 < 0 && errno == ENOENT) + SKIP(return, "%s does not exist", LIVEUPDATE_DEV); + ASSERT_GE(self->fd1, 0); + + session_fd1 = create_session(self->fd1, "double-preserve-session-1"); + ASSERT_GE(session_fd1, 0); + session_fd2 = create_session(self->fd1, "double-preserve-session-2"); + ASSERT_GE(session_fd2, 0); + + mem_fd = memfd_create("test-memfd", 0); + ASSERT_GE(mem_fd, 0); + + /* First preservation should succeed */ + ASSERT_EQ(preserve_fd(session_fd1, mem_fd, 0x1111), 0); + + /* Second preservation in a different session should fail with EBUSY */ + ret = preserve_fd(session_fd2, mem_fd, 0x2222); + EXPECT_EQ(ret, -EBUSY); + + /* Second preservation in the same session (different token) should fail with EBUSY */ + ret = preserve_fd(session_fd1, mem_fd, 0x3333); + EXPECT_EQ(ret, -EBUSY); + + ASSERT_EQ(close(mem_fd), 0); + ASSERT_EQ(close(session_fd1), 0); + ASSERT_EQ(close(session_fd2), 0); +} + TEST_HARNESS_MAIN |