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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>
master
Pasha Tatashin 2026-03-26 16:39:43 +00:00 committed by Andrew Morton
parent bc3a5763f4
commit e3e613a33e
1 changed files with 41 additions and 0 deletions
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41
tools/testing/selftests/liveupdate/liveupdate.c
View File

@ -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