| /* |
| * 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; |
| |
| struct user_desc *us = tail_alloc(sizeof(*us)); |
| unsigned int *bogus_int = tail_alloc(sizeof(*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 |