[PATCH v2 00/15] allow run with minimal kernel config

[Zhangjin Wu]

Willy, Thomas

This is v2 to allow run with minimal kernel config, see v1 [1].

It mainly applied the suggestions from Thomas. It is based on our
previous v5 sysret helper series [2] and Thomas' chmod_net removal
patchset [3].

Now, a test report on arm/vexpress-a9 without procfs, shmem, tmpfs, net
and memfd_create looks like:

    LOG: testing report for arm/vexpress-a9:

    14 chmod_net                                                    [SKIPPED]
    15 chmod_self                                                   [SKIPPED]
    17 chown_self                                                   [SKIPPED]
    41 link_cross                                                   [SKIPPED]
    0 -fstackprotector not supported                                [SKIPPED]

    139 test(s) passed, 5 skipped, 0 failed.
    See all results in /labs/linux-lab/logging/nolibc/arm-vexpress-a9-nolibc-test.log

    LOG: testing summary:

         arch/board | result
        ------------|------------
    arm/vexpress-a9 | 139 test(s) passed, 5 skipped, 0 failed. See all results in /labs/linux-lab/logging/nolibc/arm-vexpress-a9-nolibc-test.log

Changes from v1 --> v2:

* selftests/nolibc: stat_fault: silence NULL argument warning with glibc
  selftests/nolibc: gettid: restore for glibc and musl
  selftests/nolibc: add _LARGEFILE64_SOURCE for musl
  selftests/nolibc: add a new rmdir() test case
  selftests/nolibc: fix up failures when CONFIG_PROC_FS=n

    The same as v1, only a few of commit message changes.

* selftests/nolibc: fix up int_fast16/32_t test cases for musl

    Applied the method suggested by Thomas, two new macros are added to
    get SINT_MAX_OF_TYPE(type) and SINT_MIN_OF_TYPE(type).

* selftests/nolibc: fix up kernel parameters support

    After discuss with Thomas and with more tests, both of argv[1] and
    NOLIBC_TEST environment variable should be verified to support
    such kernel parameters:

      NOLIBC_TEST=syscall
      noapic NOLIBC_TEST=syscall
      noapic

* selftests/nolibc: stat_timestamps: remove procfs dependency

    Add '/init' and '/' for !procfs, don't skip it.

* selftests/nolibc: link_cross: use /proc/self/cmdline

    Use /proc/self/cmdline instead of /proc/self/net, the ramfs based
    /tmp/file doesn't work as expected (not really crossdev).

* tools/nolibc: add rmdir() support

    Now, rebased on __sysret() from sysret helper patchset [2].

* selftests/nolibc: prepare /tmp for tmpfs or ramfs

    Removed the hugetlbfs prepare part, not really required.

    Don't remove /tmp and reserve it to use ramfs as tmpfs.

* selftests/nolibc: add common get_tmpfile()
  selftests/nolibc: rename chroot_exe to chroot_tmpfile

    Some cleanups.

* selftests/nolibc: add chmod_tmpfile test

    To avoid conflict with Thomas' chmod_net removal patch [3], a new
    chmod_tmpfile is added (in v1, there is a rename patch from
    chmod_net to chmod_good)

    Still to avoid conflict, these two are removed in this series:

    - selftests/nolibc: rename proc variable to has_proc
    - selftests/nolibc: rename euid0 variable to is_root

* selftests/nolibc: vfprintf: remove MEMFD_CREATE dependency

    Many checks are removed, only reserve the direct tmpfs access
    version.

Best regards,
Zhangjin
---
[1]: https://lore.kernel.org/lkml/cover.1687344643.git.falcon@xxxxxxxxxxx/
[2]: https://lore.kernel.org/lkml/cover.1687976753.git.falcon@xxxxxxxxxxx/
[3]: https://lore.kernel.org/lkml/20230624-proc-net-setattr-v1-0-73176812adee@xxxxxxxxxxxxxx/

Zhangjin Wu (15):
  selftests/nolibc: stat_fault: silence NULL argument warning with glibc
  selftests/nolibc: gettid: restore for glibc and musl
  selftests/nolibc: add _LARGEFILE64_SOURCE for musl
  selftests/nolibc: fix up int_fast16/32_t test cases for musl
  selftests/nolibc: fix up kernel parameters support
  selftests/nolibc: stat_timestamps: remove procfs dependency
  selftests/nolibc: link_cross: use /proc/self/cmdline
  tools/nolibc: add rmdir() support
  selftests/nolibc: add a new rmdir() test case
  selftests/nolibc: fix up failures when CONFIG_PROC_FS=n
  selftests/nolibc: prepare /tmp for tmpfs or ramfs
  selftests/nolibc: add common get_tmpfile()
  selftests/nolibc: rename chroot_exe to chroot_tmpfile
  selftests/nolibc: add chmod_tmpfile test
  selftests/nolibc: vfprintf: remove MEMFD_CREATE dependency

 tools/include/nolibc/sys.h                   |  22 ++++
 tools/testing/selftests/nolibc/nolibc-test.c | 102 +++++++++++++++----
 2 files changed, 106 insertions(+), 18 deletions(-)

-- 
2.25.1