1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/* This test program is part of GDB, the GNU debugger.
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Copyright 2022-2024 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Exercise AArch64's Memory Tagging Extension corefile support. We allocate
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multiple memory mappings with PROT_MTE and assign tag values for all the
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existing MTE granules. */
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/* This test was based on the documentation for the AArch64 Memory Tagging
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Extension from the Linux Kernel, found in the sources in
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Documentation/arm64/memory-tagging-extension.rst. */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/auxv.h>
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#include <sys/mman.h>
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#include <sys/prctl.h>
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/* From arch/arm64/include/uapi/asm/hwcap.h */
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#ifndef HWCAP2_MTE
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#define HWCAP2_MTE (1 << 18)
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#endif
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/* From arch/arm64/include/uapi/asm/mman.h */
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#ifndef PROT_MTE
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#define PROT_MTE 0x20
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#endif
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#ifndef PR_SET_TAGGED_ADDR_CTRL
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#define PR_SET_TAGGED_ADDR_CTRL 55
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#define PR_TAGGED_ADDR_ENABLE (1UL << 0)
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#endif
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/* From include/uapi/linux/prctl.h */
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#ifndef PR_MTE_TCF_SHIFT
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#define PR_MTE_TCF_SHIFT 1
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#define PR_MTE_TCF_SYNC (1UL << PR_MTE_TCF_SHIFT)
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#define PR_MTE_TCF_ASYNC (2UL << PR_MTE_TCF_SHIFT)
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#define PR_MTE_TAG_SHIFT 3
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#define PR_MTE_TAG_MASK (0xffffUL << PR_MTE_TAG_SHIFT)
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#endif
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#ifdef ASYNC
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#define TCF_MODE PR_MTE_TCF_ASYNC
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#else
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#define TCF_MODE PR_MTE_TCF_SYNC
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#endif
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#define NMAPS 5
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/* We store the pointers and sizes of the memory maps we requested. Each
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of them has a different size. */
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unsigned char *mmap_pointers[NMAPS];
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/* Set the allocation tag on the destination address. */
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#define set_tag(tagged_addr) do { \
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asm volatile("stg %0, [%0]" : : "r" (tagged_addr) : "memory"); \
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} while (0)
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uintptr_t
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set_logical_tag (uintptr_t ptr, unsigned char tag)
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{
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ptr &= ~0xFF00000000000000ULL;
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ptr |= ((uintptr_t) tag << 56);
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return ptr;
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}
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void
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fill_map_with_tags (unsigned char *ptr, size_t size, unsigned char *tag)
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{
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for (size_t start = 0; start < size; start += 16)
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{
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set_tag (set_logical_tag (((uintptr_t)ptr + start) & ~(0xFULL), *tag));
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*tag = (*tag + 1) % 16;
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}
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}
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int
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main (int argc, char **argv)
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{
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unsigned char *tagged_ptr;
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unsigned long page_sz = sysconf (_SC_PAGESIZE);
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unsigned long hwcap2 = getauxval (AT_HWCAP2);
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/* Bail out if MTE is not supported. */
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if (!(hwcap2 & HWCAP2_MTE))
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return 1;
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/* Enable the tagged address ABI, synchronous MTE tag check faults and
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allow all non-zero tags in the randomly generated set. */
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if (prctl (PR_SET_TAGGED_ADDR_CTRL,
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PR_TAGGED_ADDR_ENABLE | TCF_MODE
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| (0xfffe << PR_MTE_TAG_SHIFT),
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0, 0, 0))
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{
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perror ("prctl () failed");
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return 1;
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}
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/* Map a big area of NMAPS * 2 pages. */
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unsigned char *big_map = mmap (0, NMAPS * 2 * page_sz, PROT_NONE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (big_map == MAP_FAILED)
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{
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perror ("mmap () failed");
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return 1;
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}
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/* Start with a tag of 0x1 so we can crash later. */
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unsigned char tag = 1;
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/* From that big area of NMAPS * 2 pages, go through each page and protect
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alternating pages. This should prevent the kernel from merging different
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mmap's and force the creation of multiple individual MTE-protected entries
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in /proc/<pid>/smaps. */
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for (int i = 0; i < NMAPS; i++)
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{
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mmap_pointers[i] = big_map + (i * 2 * page_sz);
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/* Enable MTE on alternating pages. */
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if (mprotect (mmap_pointers[i], page_sz,
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PROT_READ | PROT_WRITE | PROT_MTE))
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{
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perror ("mprotect () failed");
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return 1;
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}
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fill_map_with_tags (mmap_pointers[i], page_sz, &tag);
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}
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/* The following line causes a crash on purpose. */
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*mmap_pointers[0] = 0x4;
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return 0;
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}
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