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