tests: check decoding of modify_ldt syscall

* tests/modify_ldt.c: New file.
* tests/gen_tests.in: Add modify_ldt test.
* tests/pure_executables.list: Add modify_ldt.
* tests/.gitignore: Likewise.

diff --git a/tests/.gitignore b/tests/.gitignore
index cfd66c685dcfaf7ad220c6447b20642174c0f82e..094527015ef197d6de7b789961bef983a49b7d25 100644 (file)
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -190,6 +190,7 @@ mmsg
 mmsg-silent
 mmsg_name
 mmsg_name-v
+modify_ldt
 mount
 move_pages
 mq

diff --git a/tests/gen_tests.in b/tests/gen_tests.in
index 8dff19fdf88e251f9d8a4c601f6d0de7e9e22b8b..0b79a4b37902a9558906869ffc3c203f58c6ffcd 100644 (file)
--- a/tests/gen_tests.in
+++ b/tests/gen_tests.in
@@ -174,6 +174,7 @@ mmsg        -e read=0 -e write=1 -e trace=recvmmsg,sendmmsg
 mmsg-silent    -a25 -e verbose=none -e trace=sendmmsg,recvmmsg
 mmsg_name      -a25 -e trace=sendmmsg,recvmmsg
 mmsg_name-v    -v -a25 -e trace=sendmmsg,recvmmsg
+modify_ldt     -a23
 mount
 move_pages     -s3
 mq     -a32 -e trace=mq_getsetattr,mq_open,mq_unlink

diff --git a/tests/modify_ldt.c b/tests/modify_ldt.c
new file mode 100644 (file)
index 0000000..510ae0b
--- /dev/null
+++ b/tests/modify_ldt.c
@@ -0,0 +1,159 @@
+/*
+ * Check decoding of modify_ldt syscall.
+ *
+ * Copyright (c) 2018 The strace developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+
+#include <asm/unistd.h>
+
+#if defined __NR_modify_ldt && defined HAVE_STRUCT_USER_DESC
+
+# include <errno.h>
+# include <stdio.h>
+# include <unistd.h>
+# include <asm/ldt.h>
+
+void
+print_user_desc(struct user_desc *us, const char *entry_str)
+{
+       if (entry_str)
+               printf("{entry_number=%s", entry_str);
+       else
+               printf("{entry_number=%u", us->entry_number);
+
+       printf(", base_addr=%#08x"
+              ", limit=%#08x"
+              ", seg_32bit=%u"
+              ", contents=%u"
+              ", read_exec_only=%u"
+              ", limit_in_pages=%u"
+              ", seg_not_present=%u"
+              ", useable=%u"
+#ifdef __x86_64__
+              ", lm=%u"
+#endif
+              "}",
+              us->base_addr,
+              us->limit,
+              us->seg_32bit,
+              us->contents,
+              us->read_exec_only,
+              us->limit_in_pages,
+              us->seg_not_present,
+              us->useable
+#ifdef __x86_64__
+              , us->lm
+#endif
+              );
+}
+
+void
+printrc(long rc)
+{
+#ifdef __x86_64__
+       int err = -rc;
+
+       /* Thanks, long return type of syscall(2) */
+       printf("%lld", zero_extend_signed_to_ull(rc));
+
+       if (err > 0 && err < 0x1000) {
+               errno = err;
+               printf(" %s (%m)", errno2name());
+       }
+#else
+       printf("%s", sprintrc(rc));
+#endif
+
+       puts("");
+}
+
+int
+main(void)
+{
+       static const kernel_ulong_t bogus_func =
+               (kernel_ulong_t) 0xbadc0dedda7a1057ULL;
+       static const kernel_ulong_t bogus_bytecount =
+               (kernel_ulong_t) 0xdeadfacefa57beefULL;
+
+       struct user_desc *us = tail_alloc(sizeof(*us));
+       long rc;
+
+       fill_memory(us, sizeof(*us));
+
+       rc = syscall(__NR_modify_ldt, 0, 0, 0);
+       printf("modify_ldt(0, NULL, 0) = ");
+       printrc(rc);
+
+       rc = syscall(__NR_modify_ldt, bogus_func, (kernel_long_t) -1,
+                    bogus_bytecount);
+       printf("modify_ldt(%d, %#llx, %llu) = ",
+              (int) bogus_func,
+              zero_extend_signed_to_ull((kernel_long_t) -1),
+              (unsigned long long) bogus_bytecount);
+       printrc(rc);
+
+       rc = syscall(__NR_modify_ldt, bogus_func, us + 1, 0);
+       printf("modify_ldt(%d, %p, 0) = ", (int) bogus_func, us + 1);
+       printrc(rc);
+
+       rc = syscall(__NR_modify_ldt, bogus_func, us, 42);
+       printf("modify_ldt(%d, %p, 42) = ", (int) bogus_func, us);
+       printrc(rc);
+
+       rc = syscall(__NR_modify_ldt, bogus_func, us + 1, sizeof(*us));
+       printf("modify_ldt(%d, %p, %zu) = ",
+              (int) bogus_func, us + 1, sizeof(*us));
+       printrc(rc);
+
+       rc = syscall(__NR_modify_ldt, bogus_func, us, sizeof(*us));
+       printf("modify_ldt(%d, ", (int) bogus_func);
+       print_user_desc(us, NULL);
+       printf(", %zu) = ", sizeof(*us));
+       printrc(rc);
+
+       fill_memory_ex(us, sizeof(*us), 0x55, 80);
+       us->entry_number = -1;
+       us->base_addr = 0;
+       us->limit = 0;
+
+       rc = syscall(__NR_modify_ldt, bogus_func, us, sizeof(*us));
+       printf("modify_ldt(%d, ", (int) bogus_func);
+       print_user_desc(us, "-1");
+       printf(", %zu) = ", sizeof(*us));
+       printrc(rc);
+
+       puts("+++ exited with 0 +++");
+
+       return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_modify_ldt && HAVE_STRUCT_USER_DESC");
+
+#endif

diff --git a/tests/pure_executables.list b/tests/pure_executables.list
index 0d1964defbecff991b87a7d1ed114a4f3edae6e3..07fa99ffc66efa4b93d451f71a273796c0d568ef 100755 (executable)
--- a/tests/pure_executables.list
+++ b/tests/pure_executables.list
@@ -154,6 +154,7 @@ mmap
 mmap64
 mmsg
 mmsg_name
+modify_ldt
 mount
 move_pages
 mq