* + selftests-liveupdate-add-test-for-double-preservation.patch added to mm-new branch
@ 2026-03-24 15:03 Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-03-24 15:03 UTC (permalink / raw)
To: mm-commits, skhawaja, shuah, rppt, pratyush, dmatlack,
pasha.tatashin, akpm
The patch titled
Subject: selftests: liveupdate: add test for double preservation
has been added to the -mm mm-new branch. Its filename is
selftests-liveupdate-add-test-for-double-preservation.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-liveupdate-add-test-for-double-preservation.patch
This patch will later appear in the mm-new branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews. Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.
The mm-new branch of mm.git is not included in linux-next
If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Pasha Tatashin <pasha.tatashin@soleen.com>
Subject: selftests: liveupdate: add test for double preservation
Date: Mon, 23 Mar 2026 20:31:45 +0000
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://lkml.kernel.org/r/20260323203145.148057-3-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Cc: David Matlack <dmatlack@google.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
tools/testing/selftests/liveupdate/liveupdate.c | 41 ++++++++++++++
1 file changed, 41 insertions(+)
--- a/tools/testing/selftests/liveupdate/liveupdate.c~selftests-liveupdate-add-test-for-double-preservation
+++ a/tools/testing/selftests/liveupdate/liveupdate.c
@@ -345,4 +345,45 @@ TEST_F(liveupdate_device, preserve_unsup
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
_
Patches currently in -mm which might be from pasha.tatashin@soleen.com are
mm-vmalloc-export-clear_vm_uninitialized_flag.patch
kho-fix-kasan-support-for-restored-vmalloc-regions.patch
liveupdate-protect-file-handler-list-with-rwsem.patch
liveupdate-protect-flb-lists-with-rwsem.patch
liveupdate-remove-file-handler-module-refcounting.patch
liveupdate-defer-flb-module-refcounting-to-active-sessions.patch
liveupdate-remove-luo_session_quiesce.patch
liveupdate-auto-unregister-flbs-on-file-handler-unregistration.patch
liveupdate-remove-liveupdate_test_unregister.patch
liveupdate-make-unregister-functions-return-void.patch
liveupdate-prevent-double-management-of-files.patch
selftests-liveupdate-add-test-for-double-preservation.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
* + selftests-liveupdate-add-test-for-double-preservation.patch added to mm-new branch
@ 2026-03-27 1:19 Andrew Morton
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Morton @ 2026-03-27 1:19 UTC (permalink / raw)
To: mm-commits, skhawaja, shuah, rppt, pratyush, dmatlack,
pasha.tatashin, akpm
The patch titled
Subject: selftests: liveupdate: add test for double preservation
has been added to the -mm mm-new branch. Its filename is
selftests-liveupdate-add-test-for-double-preservation.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-liveupdate-add-test-for-double-preservation.patch
This patch will later appear in the mm-new branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews. Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.
The mm-new branch of mm.git is not included in linux-next
If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via various
branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there most days
------------------------------------------------------
From: Pasha Tatashin <pasha.tatashin@soleen.com>
Subject: selftests: liveupdate: add test for double preservation
Date: Thu, 26 Mar 2026 16:39:43 +0000
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://lkml.kernel.org/r/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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
tools/testing/selftests/liveupdate/liveupdate.c | 41 ++++++++++++++
1 file changed, 41 insertions(+)
--- a/tools/testing/selftests/liveupdate/liveupdate.c~selftests-liveupdate-add-test-for-double-preservation
+++ a/tools/testing/selftests/liveupdate/liveupdate.c
@@ -345,4 +345,45 @@ TEST_F(liveupdate_device, preserve_unsup
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
_
Patches currently in -mm which might be from pasha.tatashin@soleen.com are
liveupdate-protect-file-handler-list-with-rwsem.patch
liveupdate-protect-flb-lists-with-rwsem.patch
liveupdate-remove-file-handler-module-refcounting.patch
liveupdate-defer-flb-module-refcounting-to-active-sessions.patch
liveupdate-remove-luo_session_quiesce.patch
liveupdate-auto-unregister-flbs-on-file-handler-unregistration.patch
liveupdate-remove-liveupdate_test_unregister.patch
liveupdate-make-unregister-functions-return-void.patch
liveupdate-prevent-double-management-of-files.patch
memfd-implement-get_id-for-memfd_luo.patch
selftests-liveupdate-add-test-for-double-preservation.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
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