linux-next.git/tools/testing/selftests/sysctl, branch master

selftests: sysctl: Check the sign of a negative jiffies read

2026-09-25T12:00:00+00:00

proc_int_k2u_conv_kop() returns the sign through *negp and the magnitude through *u_ptr. For a negative value it used to convert the sign-extended int and negate afterwards, so the magnitude came back as a wrapped 64-bit number. Nothing noticed, because no test wrote a negative value to a jiffies sysctl. Write one to each of the three int converters and require the value to read back unchanged. Each value is chosen to convert exactly at every CONFIG_HZ, so the test does not depend on it: converter write jiffies stored reads back jiffies -1 -HZ -1 ms_jiffies -1000 -HZ -1000 userhz_jiffies -100 -HZ -100 On a kernel without the fix, at CONFIG_HZ=250: # int_jiffies: got '-18372957097414713411', want '-1' # int_ms_jiffies: got '-18446744069414585320', want '-1000' # int_userhz_jiffies: got '-18446742229035144346', want '-100' not ok 1 test_int_jiffies_negative (paths shortened; the runner prints them under /proc/sys/debug/test_sysctl) Signed-off-by: Zhan Xusheng Reviewed-by: Bradley Morgan Tested-by: Bradley Morgan Signed-off-by: Joel Granados

sysctl: Rewrite selftests on top of KTAP helpers

2026-09-23T13:22:55+00:00

Use kselftest/ktap_helpers.sh so that each test reports its own KTAP result. A failure names the test but continues with the rest of the suite. Tests are functions prefixed by "test_", they run in a subshell and do not leak state to other tests. Sysctl test assertions (assert*) emit a KTAP diagnostic and return a status, never exit. The sysctl selftests arguments are: -r N repeat selected tests N times (default 1) -l list discovered tests -t T space separated tests list. For example "test_1 test_2" -s N base seed for the randomized bitmap iterations. -h, --help help It is a single commit to avoid intermediate states where the runner exists with no tests or where scaffolding is added only to be deleted later in the same series. Neither bisects usefully. Assisted-by: Claude:claude-opus-5 Signed-off-by: Joel Granados

sysctl: Add 0013 to test partially updated vectors

2026-09-10T12:52:15+00:00

Add coverage for partially updated sysctl vectors with test 0013. It makes sure that the sysctl vector is unchanged when one of the elements is not valid. Reviewed-by: Bradley Morgan Signed-off-by: Joel Granados

sysctl: Nixify sysctl.sh

2025-07-23T09:56:02+00:00

Use "#!/usr/bin/env bash" instead of "#!/bin/bash". Needed for testing in nix environments as they only provide /usr/bin/env at the standard location. Signed-off-by: Joel Granados

sysctl: Add 0012 to test the u8 range check

2025-04-14T12:13:41+00:00

Add a sysctl test that uses the new u8 test ctl files in a created by the sysctl test module. Check that the u8 proc file that is valid is created and that there are two messages in dmesg for the files that were out of range. Reviewed-by: Kees Cook Signed-off-by: Joel Granados

selftests/sysctl: fix wording of help messages

2025-02-27T09:02:12+00:00

Change wording of test number recommendation to "the recommended number of times". Signed-off-by: Bharadwaj Raju Signed-off-by: Joel Granados

selftests: fix spelling/grammar errors in sysctl/sysctl.sh

2025-02-21T08:27:04+00:00

Fix the grammatical/spelling errors in sysctl/sysctl.sh. This fixes all errors pointed out by codespell in the file. Signed-off-by: Chandra Pratap Signed-off-by: Joel Granados

sysclt: Clarify the results of selftest run

2023-12-28T12:57:57+00:00

In some cases the result of test were hidden inside the stdout and it was difficult to identify when a test was skipped and why. List of changes 1. Capitalize all the words that express a test result : "OK", "SKIPPED" and "FAIL". 2. Place all test result text at the end of the message. This will prevent the result from being hidden when stdout is verbose. 3. Any other explanation that comes after the result text will be placed in a new line. 4. All failures are marked as "FAIL" 5. Pipped the failure to stderr in tests 8, 9, 10. 6. Replaced bogus "FAIL" with "SKIPPED" in test 0007 7. All "..." are prefixed and followed by a space. Signed-off-by: Joel Granados Signed-off-by: Luis Chamberlain

sysctl: Add a selftest for handling empty dirs

2023-12-28T12:57:57+00:00

Basic test to ensure that empty directories can be registered and that they in turn can serve as a base dir for other registrations. Add one test to the sysctl selftest module. It first registers an empty directory under "empty_add" and then uses that as a base to register another empty dir. The sysctl bash script then checks that "empty_add" is present and that there an empty directory within it. Signed-off-by: Joel Granados Signed-off-by: Luis Chamberlain

test_sysclt: Test for registering a mount point

2023-06-18T09:32:54+00:00

Test that target gets created by register_sysctl_mount_point and that no additional target can be created "on top" of a permanently empty sysctl table. Create a mount point target (mnt) in the sysctl test driver; try to create another on top of that (mnt_error). Output an error if "mnt_error" is present when we run the sysctl selftests. Signed-off-by: Joel Granados Signed-off-by: Luis Chamberlain