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/*
* Check decoding of set_thread_area and get_thread_area syscalls on x86
* architecture.
*
* Copyright (c) 2018-2019 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#if defined __NR_get_thread_area && defined __NR_set_thread_area \
&& defined HAVE_STRUCT_USER_DESC
# include <assert.h>
# include <errno.h>
# include <stdio.h>
# include <stdint.h>
# include <string.h>
# include <unistd.h>
# include "print_user_desc.c"
long errnum;
static void
printptr(kernel_ulong_t ptr, const char *ptr_str)
{
if (ptr_str)
printf("%s", ptr_str);
else
printf("%#llx", zero_extend_signed_to_ull(ptr));
}
/**
* Perform set_thread_area call along with printing the expected output.
*
* @param ptr_val Pointer to thread area argument.
* @param ptr_str Explicit string representation of the argument.
* @param valid Whether argument points to the valid memory and its contents
* should be decoded.
* @param entry_number_str explicit decoding of the entry_number field.
*/
static long
set_thread_area(kernel_ulong_t ptr_val, const char *ptr_str, bool valid,
const char *entry_number_str)
{
struct user_desc *ptr = (struct user_desc *) (uintptr_t) ptr_val;
long rc = -1;
int saved_errno;
rc = syscall(__NR_set_thread_area, ptr_val);
saved_errno = errno;
printf("set_thread_area(");
if (valid)
print_user_desc(ptr, entry_number_str);
else
printptr(ptr_val, ptr_str);
errno = saved_errno;
printf(") = %s", sprintrc(rc));
if (!rc)
printf(" (entry_number=%u)", ptr->entry_number);
puts("");
return rc;
}
/**
* Perform get_thread_are call along with printing the expected output and
* checking the result against the argument of the previous set_thread_area
* call, if it had place.
*
* @param ptr_val Pointer to thread area argument.
* @param ptr_str Explicit string representation of the argument.
* @param valid Whether argument points to the valid memory and its contents
* should be decoded.
* @param set_rc Return code of the previous set_thread_area call.
* @param expected The value of the argument passed to the previous
* set_thread_area call.
*/
static void
get_thread_area(kernel_ulong_t ptr_val, const char *ptr_str, bool valid,
long set_rc, kernel_ulong_t expected)
{
struct user_desc *ptr = (struct user_desc *) (uintptr_t) ptr_val;
struct user_desc *expected_ptr =
(struct user_desc *) (uintptr_t) expected;
int saved_errno;
long rc;
rc = syscall(__NR_get_thread_area, ptr_val);
saved_errno = errno;
printf("get_thread_area(");
if (valid && !rc) {
if (!set_rc) {
assert(ptr->entry_number == expected_ptr->entry_number);
assert(ptr->base_addr == expected_ptr->base_addr);
assert(ptr->limit == expected_ptr->limit);
assert(ptr->seg_32bit == expected_ptr->seg_32bit);
assert(ptr->contents == expected_ptr->contents);
assert(ptr->read_exec_only ==
expected_ptr->read_exec_only);
assert(ptr->limit_in_pages ==
expected_ptr->limit_in_pages);
assert(ptr->seg_not_present ==
expected_ptr->seg_not_present);
assert(ptr->useable == expected_ptr->useable);
/*
* We do not check lm as 32-bit processes ignore it, and
* only 32-bit processes can successfully execute
* get_thread_area.
*/
}
print_user_desc(ptr,
(int) ptr->entry_number == -1 ? "-1" : NULL);
} else {
printptr(ptr_val, ptr_str);
}
errno = saved_errno;
printf(") = %s\n", sprintrc(rc));
}
int main(void)
{
TAIL_ALLOC_OBJECT_CONST_PTR(struct user_desc, ta1);
TAIL_ALLOC_OBJECT_CONST_PTR(struct user_desc, ta2);
TAIL_ALLOC_OBJECT_CONST_PTR(unsigned int, bogus_entry_number);
long set_rc = -1;
/*
* Let's do some weird syscall, it will mark the beginning of our
* expected output.
*/
syscall(__NR_reboot, 0, 0, 0, 0);
set_rc = set_thread_area((uintptr_t) ARG_STR(NULL), false, NULL);
get_thread_area((uintptr_t) ARG_STR(NULL), false, set_rc,
(uintptr_t) NULL);
set_rc = set_thread_area(-1, NULL, false, NULL);
get_thread_area(-1, NULL, false, set_rc, -1);
fill_memory(ta1, sizeof(*ta1));
fill_memory_ex(ta2, sizeof(*ta2), 0xA5, 0x5A);
set_thread_area((uintptr_t) (ta1 + 1), NULL, false, NULL);
set_thread_area((uintptr_t) bogus_entry_number, NULL, false, NULL);
set_thread_area((uintptr_t) ta1, NULL, true, NULL);
ta1->entry_number = -1;
ta1->base_addr = 0;
ta1->limit = 0;
ta1->contents = 1;
ta1->seg_32bit = 1;
ta1->seg_not_present = 0;
set_rc = set_thread_area((uintptr_t) ta1, NULL, true, "-1");
*bogus_entry_number = 2718281828U;
get_thread_area((uintptr_t) bogus_entry_number,
"{entry_number=2718281828, ...}",
false, set_rc, (uintptr_t) ta1);
/* That one should return -EFAULT on i386 */
*bogus_entry_number = 12;
get_thread_area((uintptr_t) bogus_entry_number,
"{entry_number=12, ...}",
false, set_rc, (uintptr_t) ta1);
ta2->entry_number = 3141592653U;
get_thread_area((uintptr_t) ta2, "{entry_number=3141592653, ...}",
false, set_rc, (uintptr_t) ta1);
ta2->entry_number = -1;
get_thread_area((uintptr_t) ta2, "{entry_number=-1, ...}",
false, set_rc, (uintptr_t) ta1);
ta2->entry_number = ta1->entry_number;
assert(set_rc == 0 || (int) ta2->entry_number == -1);
get_thread_area((uintptr_t) ta2, "{entry_number=-1, ...}",
true, set_rc, (uintptr_t) ta1);
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_get_thread_area && __NR_set_thread_area"
" && HAVE_STRUCT_USER_DESC");
#endif
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