85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* Check decoding of prctl PR_GET_TID_ADDRESS operation.
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*
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* Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
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* Copyright (c) 2016-2018 The strace developers.
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "tests.h"
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#include <asm/unistd.h>
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#include <linux/prctl.h>
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#if defined __NR_prctl && defined __NR_set_tid_address && \
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defined PR_GET_TID_ADDRESS
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# include <inttypes.h>
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# include <stdio.h>
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# include <unistd.h>
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static const char *
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sprintaddr(kernel_ulong_t addr)
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{
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static char buf[sizeof("0x") + sizeof(addr) * 2];
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if (addr) {
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snprintf(buf, sizeof(buf), "%#llx", (unsigned long long) addr);
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return buf;
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}
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return "NULL";
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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_addr =
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(kernel_ulong_t) 0xfffffffffffffffdULL;
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/* Note that kernel puts kernel-sized pointer even on x32 */
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TAIL_ALLOC_OBJECT_CONST_PTR(kernel_ulong_t, ptr);
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long rc;
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long set_ok;
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*ptr = (kernel_ulong_t) 0xbadc0dedda7a1057ULL;
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rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, NULL);
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printf("prctl(PR_GET_TID_ADDRESS, NULL) = %s\n", sprintrc(rc));
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rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, bogus_addr);
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printf("prctl(PR_GET_TID_ADDRESS, %#llx) = %s\n",
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(unsigned long long) bogus_addr, sprintrc(rc));
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rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, ptr);
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if (rc) {
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printf("prctl(PR_GET_TID_ADDRESS, %p) = %s\n",
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ptr, sprintrc(rc));
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} else {
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printf("prctl(PR_GET_TID_ADDRESS, [%s]) = %s\n",
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sprintaddr(*ptr), sprintrc(rc));
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}
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set_ok = syscall(__NR_set_tid_address, bogus_addr);
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rc = syscall(__NR_prctl, PR_GET_TID_ADDRESS, ptr);
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if (rc) {
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printf("prctl(PR_GET_TID_ADDRESS, %p) = %s\n",
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ptr, sprintrc(rc));
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} else {
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printf("prctl(PR_GET_TID_ADDRESS, [%s]) = %s\n",
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sprintaddr(set_ok ? bogus_addr : *ptr), sprintrc(rc));
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}
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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_prctl && __NR_set_tid_address && PR_GET_TID_ADDRESS")
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#endif
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