[LTP] [PATCH v3] Refactor fork05 using new LTP API
Andrea Cervesato
andrea.cervesato@suse.de
Fri Mar 22 10:28:32 CET 2024
From: Andrea Cervesato <andrea.cervesato@suse.com>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
simplified documentation
TST_ABI32 usage
exit(0)
check if child crashed
testcases/kernel/syscalls/fork/fork05.c | 239 ++++++++----------------
1 file changed, 77 insertions(+), 162 deletions(-)
diff --git a/testcases/kernel/syscalls/fork/fork05.c b/testcases/kernel/syscalls/fork/fork05.c
index 9a99cff1d..10ae5258a 100644
--- a/testcases/kernel/syscalls/fork/fork05.c
+++ b/testcases/kernel/syscalls/fork/fork05.c
@@ -1,150 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
- * Portions Copyright (c) 2000 Ulrich Drepper
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- * Further, this software is distributed without any warranty that it is
- * free of the rightful claim of any third person regarding infringement
- * or the like. Any license provided herein, whether implied or
- * otherwise, applies only to this software file. Patent licenses, if
- * any, provided herein do not apply to combinations of this program with
- * other software, or any other product whatsoever.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
- * Mountain View, CA 94043, or:
- *
- * http://www.sgi.com$
- *
- * For further information regarding this notice, see:$
- *
- * http://oss.sgi.com/projects/GenInfo/NoticeExplan/
- *
- *
- * Linux Test Project - Silicon Graphics, Inc.
- * TEST IDENTIFIER : fork05
- * EXECUTED BY : anyone
- * TEST TITLE : Make sure LDT is propagated correctly
- * TEST CASE TOTAL : 1
- * CPU TYPES : i386
- * AUTHORS : Ulrich Drepper
- * Nate Straz
- *
- *On Friday, May 2, 2003 at 09:47:00AM MST, Ulrich Drepper wrote:
- *>Robert Williamson wrote:
- *>
- *>> I'm getting a SIGSEGV with one of our tests, fork05.c, that apparently
- *>> you wrote (attached below). The test passes on my 2.5.68 machine running
- *>> SuSE 8.0 (glibc 2.2.5 and Linuxthreads), however it segmentation faults on
- *>> RedHat 9 running 2.5.68. The test seems to "break" when it attempts to run
- *>> the assembly code....could you take a look at it?
- *>
- *>There is no need to look at it, I know it cannot work anymore on recent
- *>systems. Either change all uses of %gs to %fs or skip the entire patch
- *>if %gs has a nonzero value.
- *>
- *>- --
- *>- --------------. ,-. 444 Castro Street
- *>Ulrich Drepper \ ,-----------------' \ Mountain View, CA 94041 USA
- *>Red Hat `--' drepper at redhat.com `---------------------------
- *
+ * Author: Ulrich Drepper / Nate Straz , Red Hat
+ * Copyright (C) 2023 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
*
+ * This test verifies that LDT is propagated correctly from parent process to
+ * the child process.
*
- *On Sat, Aug 12, 2000 at 12:47:31PM -0700, Ulrich Drepper wrote:
- *> Ever since the %gs handling was fixed in the 2.3.99 series the
- *> appended test program worked. Now with 2.4.0-test6 it's not working
- *> again. Looking briefly over the patch from test5 to test6 I haven't
- *> seen an immediate candidate for the breakage. It could be missing
- *> propagation of the LDT to the new process (and therefore an invalid
- *> segment descriptor) or simply clearing %gs.
- *>
- *> Anyway, this is what you should see and what you get with test5:
- *>
- *> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *> a = 42
- *> %gs = 0x0007
- *> %gs = 0x0007
- *> a = 99
- *> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *>
- *> This is what you get with test6:
- *>
- *> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *> a = 42
- *> %gs = 0x0007
- *> %gs = 0x0000
- *> <SEGFAULT>
- *> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *>
- *> If somebody is actually creating a test suite for the kernel, please
- *> add this program. It's mostly self-contained. The correct handling
- *> of %gs is really important since glibc 2.2 will make heavy use of it.
- *>
- *> - --
- *> - ---------------. ,-. 1325 Chesapeake Terrace
- *> Ulrich Drepper \ ,-------------------' \ Sunnyvale, CA 94089 USA
- *> Red Hat `--' drepper at redhat.com `------------------------
- *>
- *> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * On Friday, May 2, 2003 at 09:47:00AM MST, Ulrich Drepper wrote:
+ * >Robert Williamson wrote:
+ * >
+ * >> I'm getting a SIGSEGV with one of our tests, fork05.c, that apparently
+ * >> you wrote (attached below). The test passes on my 2.5.68 machine running
+ * >> SuSE 8.0 (glibc 2.2.5 and Linuxthreads), however it segmentation faults on
+ * >> RedHat 9 running 2.5.68. The test seems to "break" when it attempts to run
+ * >> the assembly code....could you take a look at it?
+ * >
+ * >There is no need to look at it, I know it cannot work anymore on recent
+ * >systems. Either change all uses of %gs to %fs or skip the entire patch
+ * >if %gs has a nonzero value.
+ * >
*
+ * On Sat, Aug 12, 2000 at 12:47:31PM -0700, Ulrich Drepper wrote:
+ * > Ever since the %gs handling was fixed in the 2.3.99 series the
+ * > appended test program worked. Now with 2.4.0-test6 it's not working
+ * > again. Looking briefly over the patch from test5 to test6 I haven't
+ * > seen an immediate candidate for the breakage. It could be missing
+ * > propagation of the LDT to the new process (and therefore an invalid
+ * > segment descriptor) or simply clearing %gs.
+ * >
+ * > Anyway, this is what you should see and what you get with test5:
+ * >
+ * > a = 42
+ * > %gs = 0x0007
+ * > %gs = 0x0007
+ * > a = 99
+ * >
+ * > This is what you get with test6:
+ * >
+ * > a = 42
+ * > %gs = 0x0007
+ * > %gs = 0x0000
+ * > <SEGFAULT>
+ * >
+ * > If somebody is actually creating a test suite for the kernel, please
+ * > add this program. It's mostly self-contained. The correct handling
+ * > of %gs is really important since glibc 2.2 will make heavy use of it.
+ * >
*/
-#include <stdio.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <sys/wait.h>
+#include "tst_test.h"
#include "lapi/syscalls.h"
-#include "test.h"
-
-char *TCID = "fork05";
-
-static char *environ_list[] = { "TERM", "NoTSetzWq", "TESTPROG" };
-
-#define NUMBER_OF_ENVIRON (sizeof(environ_list)/sizeof(char *))
-int TST_TOTAL = NUMBER_OF_ENVIRON;
+#include <asm/ldt.h>
-#if defined(linux) && defined(__i386__)
+#if TST_ABI32
-struct modify_ldt_ldt_s {
- unsigned int entry_number;
- unsigned long int base_addr;
- unsigned int limit;
- unsigned int seg_32bit:1;
- unsigned int contents:2;
- unsigned int read_exec_only:1;
- unsigned int limit_in_pages:1;
- unsigned int seg_not_present:1;
- unsigned int useable:1;
- unsigned int empty:25;
-};
-
-static int a = 42;
-
-static void modify_ldt(int func, struct modify_ldt_ldt_s *ptr, int bytecount)
-{
- tst_syscall(__NR_modify_ldt, func, ptr, bytecount);
-}
-
-int main(void)
+static void run(void)
{
- struct modify_ldt_ldt_s ldt0;
- int lo;
+ struct user_desc ldt0;
+ int base_addr = 42;
+ int status;
pid_t pid;
- int res;
+ int lo;
ldt0.entry_number = 0;
- ldt0.base_addr = (long)&a;
+ ldt0.base_addr = (long)&base_addr;
ldt0.limit = 4;
ldt0.seg_32bit = 1;
ldt0.contents = 0;
@@ -154,49 +78,40 @@ int main(void)
ldt0.useable = 1;
ldt0.empty = 0;
- modify_ldt(1, &ldt0, sizeof(ldt0));
+ tst_syscall(__NR_modify_ldt, 1, &ldt0, sizeof(ldt0));
asm volatile ("movw %w0, %%fs"::"q" (7));
-
asm volatile ("movl %%fs:0, %0":"=r" (lo));
- tst_resm(TINFO, "a = %d", lo);
+ tst_res(TINFO, "a = %d", lo);
asm volatile ("pushl %%fs; popl %0":"=q" (lo));
- tst_resm(TINFO, "%%fs = %#06hx", lo);
+ tst_res(TINFO, "%%fs = %#06hx", lo);
asm volatile ("movl %0, %%fs:0"::"r" (99));
- pid = fork();
-
- if (pid == 0) {
+ pid = SAFE_FORK();
+ if (!pid) {
asm volatile ("pushl %%fs; popl %0":"=q" (lo));
- tst_resm(TINFO, "%%fs = %#06hx", lo);
+ tst_res(TINFO, "%%fs = %#06hx", lo);
asm volatile ("movl %%fs:0, %0":"=r" (lo));
- tst_resm(TINFO, "a = %d", lo);
-
- if (lo != 99)
- tst_resm(TFAIL, "Test failed");
- else
- tst_resm(TPASS, "Test passed");
- exit(lo != 99);
- } else {
- waitpid(pid, &res, 0);
- }
+ tst_res(TINFO, "a = %d", lo);
- return WIFSIGNALED(res);
-}
+ TST_EXP_EQ_LI(lo, 99);
-#else /* if defined(linux) && defined(__i386__) */
+ exit(0);
+ }
-int main(void)
-{
- tst_resm(TINFO, "%%fs test only for ix86");
+ SAFE_WAITPID(pid, &status, 0);
- /*
- * should be successful on all non-ix86 platforms.
- */
- tst_exit();
+ if (WIFSIGNALED(status) && WTERMSIG(status) == SIGSEGV)
+ tst_res(TFAIL, "Child crashed with SIGSEGV");
}
-#endif /* if defined(linux) && defined(__i386__) */
+static struct tst_test test = {
+ .run_all = run
+};
+
+#else
+ TST_TEST_TCONF("Test only supports linux 32 bits");
+#endif
--
2.35.3
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