You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
4.0 KiB
138 lines
4.0 KiB
/*
|
|
* 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 "print_user_desc.c"
|
|
|
|
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;
|
|
|
|
TAIL_ALLOC_OBJECT_CONST_PTR(struct user_desc, us);
|
|
TAIL_ALLOC_OBJECT_CONST_PTR(unsigned int, bogus_int);
|
|
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);
|
|
|
|
/*
|
|
* print_user_desc handles entry_number field in a special way for
|
|
* get_thread_area syscall, so let's also check here that we don't
|
|
* retrieve it accidentally.
|
|
*/
|
|
rc = syscall(__NR_modify_ldt, bogus_func, bogus_int, sizeof(*us));
|
|
printf("modify_ldt(%d, %p, %zu) = ",
|
|
(int) bogus_func, bogus_int, 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
|