kernel/linux.git/tools/testing/selftests/nolibc, branch v6.7

selftests/nolibc: add tests for multi-object linkage

2023-10-12T19:14:20+00:00

While uncommon, nolibc executables can be linked together from multiple compilation units. Add some tests to make sure everything works in that case. Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/lkml/20231012-nolibc-linkage-test-v1-1-315e682768b4@weissschuh.net/ Acked-by: Willy Tarreau

selftests/nolibc: use qemu-system-ppc64 for ppc64le

2023-10-12T19:14:19+00:00

qemu-system-ppc64 can handle both big and little endian kernels. While some setups, like Debian, provide a symlink to execute qemu-system-ppc64 as qemu-system-ppc64le, others, like ArchLinux, do not. So always use qemu-system-ppc64 directly. Signed-off-by: Thomas Weißschuh Link: https://lore.kernel.org/lkml/20231008-nolibc-qemu-ppc64-v1-1-29e2326e0420@weissschuh.net/ Acked-by: Willy Tarreau

tools/nolibc: add support for constructors and destructors

2023-10-12T19:14:16+00:00

With the startup code moved to C, implementing support for constructors and deconstructors is fairly easy to implement. Examples for code size impact: text data bss dec hex filename 21837 104 88 22029 560d nolibc-test.before 22135 120 88 22343 5747 nolibc-test.after 21970 104 88 22162 5692 nolibc-test.after-only-crt.h-changes The sections are defined by [0]. [0] https://refspecs.linuxfoundation.org/elf/gabi4+/ch5.dynamic.html Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://lore.kernel.org/lkml/20231007-nolibc-constructors-v2-1-ef84693efbc1@weissschuh.net/

tools/nolibc: drop test for getauxval(AT_PAGESZ)

2023-10-12T19:14:15+00:00

Other testcases are already testing the same functionality: * auxv_AT_UID tests getauxval() in general. * test_getpagesize() tests pagesize() which directly calls getauxval(AT_PAGESZ). Link: https://lore.kernel.org/r/20231007-nolibc-auxval-pagesz-v1-1-af00804edead@weissschuh.net Signed-off-by: Thomas Weißschuh

selftests/nolibc: allow building i386 with multiarch compiler

2023-10-12T19:14:09+00:00

When building with a multiarch-capable compiler, like those provided by common distributions the -m32 argument is required to build 32bit code. Wrap it in cc-option in case the compiler is not multiarch-capable. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://lore.kernel.org/r/20230917-nolibc-syscall-nr-v2-1-03863d509b9a@weissschuh.net

selftests/nolibc: don't embed initramfs into kernel image

2023-10-12T19:14:07+00:00

When the initramfs is embedded into the kernel each rebuild of it will trigger a full kernel relink and all the expensive postprocessing steps. Currently nolibc-test and therefore the initramfs are always rebuild, even without source changes, leading to lots of slow kernel relinks. Instead of linking the initramfs into the kernel assemble it manually and pass it explicitly to qemu. This avoids all of the kernel relinks. Signed-off-by: Thomas Weißschuh Reviewed-by: Nicolas Schier Link: https://lore.kernel.org/r/20230917-nolibc-initramfs-v2-1-f0f293a8b198@weissschuh.net

selftests/nolibc: libc-test: avoid -Wstringop-overflow warnings

2023-10-12T19:14:05+00:00

Newer versions of glibc annotate the poll() function with __attribute__(access) which triggers a compiler warning inside the testcase poll_fault. Avoid this by using a plain NULL which is enough for the testcase. To avoid potential future warnings also adapt the other EFAULT testcases, except select_fault as NULL is a valid value for its argument. nolibc-test.c: In function ‘run_syscall’: nolibc-test.c:338:62: warning: ‘poll’ writing 8 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=] 338 | do { if (!(cond)) result(llen, SKIPPED); else ret += expect_syserr2(expr, expret, experr1, experr2, llen); } while (0) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ nolibc-test.c:341:9: note: in expansion of macro ‘EXPECT_SYSER2’ 341 | EXPECT_SYSER2(cond, expr, expret, experr, 0) | ^~~~~~~~~~~~~ nolibc-test.c:905:47: note: in expansion of macro ‘EXPECT_SYSER’ 905 | CASE_TEST(poll_fault); EXPECT_SYSER(1, poll((void *)1, 1, 0), -1, EFAULT); break; | ^~~~~~~~~~~~ cc1: note: destination object is likely at address zero In file included from /usr/include/poll.h:1, from nolibc-test.c:33: /usr/include/sys/poll.h:54:12: note: in a call to function ‘poll’ declared with attribute ‘access (write_only, 1, 2)’ 54 | extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout) | ^~~~ Signed-off-by: Thomas Weißschuh

selftests/nolibc: use -nostdinc for nolibc-test

2023-10-12T19:13:55+00:00

Avoid any accidental reliance on system includes. Signed-off-by: Thomas Weißschuh Signed-off-by: Willy Tarreau

Merge tag 'linux-kselftest-nolibc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

2023-08-29T02:03:24+00:00

Pull nolibc updates from Shuah Khan: "Nolibc: - improved portability by removing build errors with -ENOSYS - added syscall6() on MIPS to support pselect6() and mmap() - added setvbuf(), rmdir(), pipe(), pipe2() - add support for ppc/ppc64 - environ is no longer optional - fixed frame pointer issues at -O0 - dropped sys_stat() in favor of sys_statx() - centralized _start_c() to remove lots of asm code - switched size_t to __SIZE_TYPE__ Selftests: - improved status reporting (success/warning/failure counts, path to log file) - various code cleanups (indent, unused variables, ...) - more consistent test numbering - enabled compiler warnings - dropped unreliable chmod_net test - improved reliability (create /dev/zero & /tmp, rely less on /proc) - new tests (brk/sbrk/mmap/munmap) - improved compatibility with musl - new run-nolibc-test target to build and run natively - new run-libc-test target to build and run against native libc - made the cmdline parser more reliable against boolean arguments - dropped dependency on memfd for vfprintf() test - nolibc-test is no longer stripped - added support for extending ARCH via XARCH Other: - add Thomas as co-maintainer" * tag 'linux-kselftest-nolibc-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (103 commits) tools/nolibc: avoid undesired casts in the __sysret() macro tools/nolibc: keep brk(), sbrk(), mmap() away from __sysret() tools/nolibc: silence ppc64 compile warnings selftests/nolibc: libc-test: use HOSTCC instead of CC tools/nolibc: stackprotector.h: make __stack_chk_init static selftests/nolibc: allow report with existing test log selftests/nolibc: add test support for ppc64 selftests/nolibc: add test support for ppc64le selftests/nolibc: add test support for ppc selftests/nolibc: add XARCH and ARCH mapping support tools/nolibc: add support for powerpc64 tools/nolibc: add support for powerpc MAINTAINERS: nolibc: add myself as co-maintainer selftests/nolibc: enable compiler warnings selftests/nolibc: don't strip nolibc-test selftests/nolibc: prevent out of bounds access in expect_vfprintf selftests/nolibc: use correct return type for read() and write() selftests/nolibc: avoid sign-compare warnings selftests/nolibc: avoid unused parameter warnings selftests/nolibc: make functions static if possible ...

selftests/nolibc: libc-test: use HOSTCC instead of CC

2023-08-23T03:18:50+00:00

libc-test is mainly added to compare the behavior of nolibc to the system libc, it is meaningless and error-prone with cross compiling. Let's use HOSTCC instead of CC to avoid wrongly use cross compiler when CROSS_COMPILE is passed or customized. Signed-off-by: Zhangjin Wu Fixes: cfb672f94f6e ("selftests/nolibc: add run-libc-test target") Signed-off-by: Willy Tarreau