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tools/nolibc: add namespace functionality

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This is used in various selftests and will be handy when integrating
those with nolibc.

Not all configurations support namespaces, so skip the tests where
necessary.  Also if the tests are running without privileges.
Enable the namespace configuration for those architectures where it is not
enabled by default.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-12-3c043eeab06c@linutronix.de
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
This commit is contained in:
Thomas Weißschuh 2025-04-28 14:40:13 +02:00 committed by Thomas Weißschuh
parent 7ff3c71a47
commit 256dc7339d
5 changed files with 121 additions and 0 deletions
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1
tools/include/nolibc/Makefile
View File

@ -38,6 +38,7 @@ all_files := \
math.h \
nolibc.h \
poll.h \
sched.h \
signal.h \
stackprotector.h \
std.h \

1
tools/include/nolibc/nolibc.h
View File

@ -106,6 +106,7 @@
#include "sys/wait.h"
#include "ctype.h"
#include "elf.h"
#include "sched.h"
#include "signal.h"
#include "unistd.h"
#include "stdio.h"

50
tools/include/nolibc/sched.h Normal file
View File

@ -0,0 +1,50 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* sched function definitions for NOLIBC
* Copyright (C) 2025 Thomas Weißschuh <linux@weissschuh.net>
*/
/* make sure to include all global symbols */
#include "nolibc.h"
#ifndef _NOLIBC_SCHED_H
#define _NOLIBC_SCHED_H
#include "sys.h"
#include <linux/sched.h>
/*
* int setns(int fd, int nstype);
*/
static __attribute__((unused))
int sys_setns(int fd, int nstype)
{
return my_syscall2(__NR_setns, fd, nstype);
}
static __attribute__((unused))
int setns(int fd, int nstype)
{
return __sysret(sys_setns(fd, nstype));
}
/*
* int unshare(int flags);
*/
static __attribute__((unused))
int sys_unshare(int flags)
{
return my_syscall1(__NR_unshare, flags);
}
static __attribute__((unused))
int unshare(int flags)
{
return __sysret(sys_unshare(flags));
}
#endif /* _NOLIBC_SCHED_H */

2
tools/testing/selftests/nolibc/Makefile
View File

@ -109,6 +109,8 @@ DEFCONFIG = $(DEFCONFIG_$(XARCH))
EXTRACONFIG_m68k = -e CONFIG_BLK_DEV_INITRD
EXTRACONFIG = $(EXTRACONFIG_$(XARCH))
EXTRACONFIG_arm = -e CONFIG_NAMESPACES
EXTRACONFIG_armthumb = -e CONFIG_NAMESPACES
# optional tests to run (default = all)
TEST =

67
tools/testing/selftests/nolibc/nolibc-test.c
View File

@ -1172,6 +1172,72 @@ int test_openat(void)
return 0;
}
int test_namespace(void)
{
int original_ns, new_ns, ret;
ino_t original_ns_ino;
struct stat stat_buf;
original_ns = open("/proc/self/ns/uts", O_RDONLY);
if (original_ns == -1)
return -1;
ret = fstat(original_ns, &stat_buf);
if (ret)
goto out;
original_ns_ino = stat_buf.st_ino;
ret = unshare(CLONE_NEWUTS);
if (ret)
goto out;
new_ns = open("/proc/self/ns/uts", O_RDONLY);
if (new_ns == -1) {
ret = new_ns;
goto out;
}
ret = fstat(new_ns, &stat_buf);
close(new_ns);
if (ret)
goto out;
if (stat_buf.st_ino == original_ns_ino) {
errno = EINVAL;
ret = -1;
goto out;
}
ret = setns(original_ns, CLONE_NEWUTS);
if (ret)
goto out;
new_ns = open("/proc/self/ns/uts", O_RDONLY);
if (new_ns == -1) {
ret = new_ns;
goto out;
}
ret = fstat(new_ns, &stat_buf);
if (ret)
goto out;
close(new_ns);
if (stat_buf.st_ino != original_ns_ino) {
errno = EINVAL;
ret = -1;
goto out;
}
ret = 0;
out:
close(original_ns);
return ret;
}
/* Run syscall tests between IDs <min> and <max>.
* Return 0 on success, non-zero on failure.
*/
@ -1296,6 +1362,7 @@ int run_syscall(int min, int max)
CASE_TEST(write_zero); EXPECT_SYSZR(1, write(1, &tmp, 0)); break;
CASE_TEST(syscall_noargs); EXPECT_SYSEQ(1, syscall(__NR_getpid), getpid()); break;
CASE_TEST(syscall_args); EXPECT_SYSER(1, syscall(__NR_statx, 0, NULL, 0, 0, NULL), -1, EFAULT); break;
CASE_TEST(namespace); EXPECT_SYSZR(euid0 && proc, test_namespace()); break;
case __LINE__:
return ret; /* must be last */
/* note: do not set any defaults so as to permit holes above */