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368 lines
8.7 KiB
368 lines
8.7 KiB
/*
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* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
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* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
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* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
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* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
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* Copyright (c) 2000 PocketPenguins Inc. Linux for Hitachi SuperH
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* port by Greg Banks <gbanks@pocketpenguins.com>
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* Copyright (c) 1999-2018 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 "defs.h"
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#include <linux/mman.h>
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#include <sys/mman.h>
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unsigned long
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get_pagesize(void)
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{
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static unsigned long pagesize;
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if (!pagesize) {
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long ret = sysconf(_SC_PAGESIZE);
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if (ret < 0)
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perror_func_msg_and_die("sysconf(_SC_PAGESIZE)");
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if (ret == 0)
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error_func_msg_and_die("sysconf(_SC_PAGESIZE) "
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"returned 0");
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pagesize = (unsigned long) ret;
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}
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return pagesize;
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}
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SYS_FUNC(brk)
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{
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printaddr(tcp->u_arg[0]);
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return RVAL_DECODED | RVAL_HEX;
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}
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#include "xlat/mmap_prot.h"
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#include "xlat/mmap_flags.h"
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#ifndef MAP_HUGE_SHIFT
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# define MAP_HUGE_SHIFT 26
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#endif
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#ifndef MAP_HUGE_MASK
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# define MAP_HUGE_MASK 0x3f
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#endif
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static void
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print_mmap_flags(kernel_ulong_t flags)
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{
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printxval64(mmap_flags, flags & MAP_TYPE, "MAP_???");
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flags &= ~MAP_TYPE;
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const unsigned int mask = MAP_HUGE_MASK << MAP_HUGE_SHIFT;
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const unsigned int hugetlb_value = flags & mask;
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flags &= ~mask;
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if (flags) {
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tprints("|");
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printflags64(mmap_flags, flags, NULL);
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}
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if (hugetlb_value)
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tprintf("|%u<<MAP_HUGE_SHIFT",
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hugetlb_value >> MAP_HUGE_SHIFT);
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}
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static void
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print_mmap(struct tcb *tcp, kernel_ulong_t *u_arg, unsigned long long offset)
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{
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const kernel_ulong_t addr = u_arg[0];
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const kernel_ulong_t len = u_arg[1];
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const kernel_ulong_t prot = u_arg[2];
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const kernel_ulong_t flags = u_arg[3];
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const int fd = u_arg[4];
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printaddr(addr);
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tprintf(", %" PRI_klu ", ", len);
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printflags64(mmap_prot, prot, "PROT_???");
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tprints(", ");
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print_mmap_flags(flags);
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tprints(", ");
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printfd(tcp, fd);
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tprintf(", %#llx", offset);
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}
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/* Syscall name<->function correspondence is messed up on many arches.
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* For example:
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* i386 has __NR_mmap == 90, and it is "old mmap", and
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* also it has __NR_mmap2 == 192, which is a "new mmap with page offsets".
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* But x86_64 has just one __NR_mmap == 9, a "new mmap with byte offsets".
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* Confused? Me too!
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*/
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#if HAVE_ARCH_OLD_MMAP
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/* Params are pointed to by u_arg[0], offset is in bytes */
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SYS_FUNC(old_mmap)
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{
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kernel_ulong_t *args =
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fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 6);
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if (args)
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print_mmap(tcp, args, args[5]);
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else
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printaddr(tcp->u_arg[0]);
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return RVAL_DECODED | RVAL_HEX;
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}
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# if HAVE_ARCH_OLD_MMAP_PGOFF
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/* Params are pointed to by u_arg[0], offset is in pages */
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SYS_FUNC(old_mmap_pgoff)
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{
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kernel_ulong_t *args =
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fetch_indirect_syscall_args(tcp, tcp->u_arg[0], 6);
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if (args) {
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unsigned long long offset;
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offset = args[5];
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offset *= get_pagesize();
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print_mmap(tcp, args, offset);
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} else {
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printaddr(tcp->u_arg[0]);
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}
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return RVAL_DECODED | RVAL_HEX;
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}
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# endif /* HAVE_ARCH_OLD_MMAP_PGOFF */
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#endif /* HAVE_ARCH_OLD_MMAP */
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/* Params are passed directly, offset is in bytes */
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SYS_FUNC(mmap)
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{
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/* Example of kernel-side handling of this variety of mmap:
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* arch/x86/kernel/sys_x86_64.c::SYSCALL_DEFINE6(mmap, ...) calls
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* sys_mmap_pgoff(..., off >> PAGE_SHIFT); i.e. off is in bytes,
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* since the above code converts off to pages.
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*/
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print_mmap(tcp, tcp->u_arg, tcp->u_arg[5]);
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return RVAL_DECODED | RVAL_HEX;
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}
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/* Params are passed directly, offset is in pages */
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SYS_FUNC(mmap_pgoff)
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{
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/* Try test/mmap_offset_decode.c */
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unsigned long long offset;
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offset = tcp->u_arg[5];
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offset *= get_pagesize();
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print_mmap(tcp, tcp->u_arg, offset);
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return RVAL_DECODED | RVAL_HEX;
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}
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/* Params are passed directly, offset is in 4k units */
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SYS_FUNC(mmap_4koff)
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{
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unsigned long long offset;
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offset = tcp->u_arg[5];
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offset <<= 12;
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print_mmap(tcp, tcp->u_arg, offset);
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return RVAL_DECODED | RVAL_HEX;
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}
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SYS_FUNC(munmap)
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{
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printaddr(tcp->u_arg[0]);
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tprintf(", %" PRI_klu, tcp->u_arg[1]);
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return RVAL_DECODED;
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}
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static int
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do_mprotect(struct tcb *tcp, bool has_pkey)
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{
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printaddr(tcp->u_arg[0]);
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tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
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printflags64(mmap_prot, tcp->u_arg[2], "PROT_???");
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if (has_pkey)
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tprintf(", %d", (int) tcp->u_arg[3]);
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return RVAL_DECODED;
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}
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SYS_FUNC(mprotect)
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{
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return do_mprotect(tcp, false);
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}
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SYS_FUNC(pkey_mprotect)
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{
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return do_mprotect(tcp, true);
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}
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#include "xlat/mremap_flags.h"
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SYS_FUNC(mremap)
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{
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printaddr(tcp->u_arg[0]);
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tprintf(", %" PRI_klu ", %" PRI_klu ", ", tcp->u_arg[1], tcp->u_arg[2]);
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printflags64(mremap_flags, tcp->u_arg[3], "MREMAP_???");
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#ifdef MREMAP_FIXED
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if ((tcp->u_arg[3] & (MREMAP_MAYMOVE | MREMAP_FIXED)) ==
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(MREMAP_MAYMOVE | MREMAP_FIXED)) {
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tprints(", ");
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printaddr(tcp->u_arg[4]);
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}
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#endif
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return RVAL_DECODED | RVAL_HEX;
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}
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#include "xlat/madvise_cmds.h"
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SYS_FUNC(madvise)
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{
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printaddr(tcp->u_arg[0]);
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tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
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printxval(madvise_cmds, tcp->u_arg[2], "MADV_???");
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return RVAL_DECODED;
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}
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#include "xlat/mlockall_flags.h"
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SYS_FUNC(mlockall)
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{
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printflags(mlockall_flags, tcp->u_arg[0], "MCL_???");
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return RVAL_DECODED;
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}
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#include "xlat/mctl_sync.h"
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SYS_FUNC(msync)
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{
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/* addr */
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printaddr(tcp->u_arg[0]);
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/* len */
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tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
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/* flags */
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printflags(mctl_sync, tcp->u_arg[2], "MS_???");
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return RVAL_DECODED;
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}
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#include "xlat/mlock_flags.h"
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SYS_FUNC(mlock2)
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{
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printaddr(tcp->u_arg[0]);
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tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
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printflags(mlock_flags, tcp->u_arg[2], "MLOCK_???");
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return RVAL_DECODED;
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}
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SYS_FUNC(mincore)
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{
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if (entering(tcp)) {
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printaddr(tcp->u_arg[0]);
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tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
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} else {
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const unsigned long page_size = get_pagesize();
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const unsigned long page_mask = page_size - 1;
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unsigned long len = tcp->u_arg[1];
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unsigned char *vec = NULL;
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len = len / page_size + (len & page_mask ? 1 : 0);
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if (syserror(tcp) || !verbose(tcp) ||
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!tcp->u_arg[2] || !(vec = malloc(len)) ||
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umoven(tcp, tcp->u_arg[2], len, vec) < 0)
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printaddr(tcp->u_arg[2]);
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else {
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unsigned long i;
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tprints("[");
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for (i = 0; i < len; i++) {
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if (i)
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tprints(", ");
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if (abbrev(tcp) && i >= max_strlen) {
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tprints("...");
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break;
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}
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tprints((vec[i] & 1) ? "1" : "0");
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}
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tprints("]");
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}
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free(vec);
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}
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return 0;
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}
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SYS_FUNC(remap_file_pages)
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{
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const kernel_ulong_t addr = tcp->u_arg[0];
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const kernel_ulong_t size = tcp->u_arg[1];
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const kernel_ulong_t prot = tcp->u_arg[2];
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const kernel_ulong_t pgoff = tcp->u_arg[3];
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const kernel_ulong_t flags = tcp->u_arg[4];
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printaddr(addr);
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tprintf(", %" PRI_klu ", ", size);
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printflags64(mmap_prot, prot, "PROT_???");
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tprintf(", %" PRI_klu ", ", pgoff);
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print_mmap_flags(flags);
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return RVAL_DECODED;
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}
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#if defined(POWERPC)
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static bool
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print_protmap_entry(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
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{
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tprintf("%#08x", *(unsigned int *) elem_buf);
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return true;
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}
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SYS_FUNC(subpage_prot)
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{
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kernel_ulong_t addr = tcp->u_arg[0];
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kernel_ulong_t len = tcp->u_arg[1];
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kernel_ulong_t nmemb = len >> 16;
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kernel_ulong_t map = tcp->u_arg[2];
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printaddr(addr);
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tprintf(", %" PRI_klu ", ", len);
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unsigned int entry;
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print_array(tcp, map, nmemb, &entry, sizeof(entry),
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tfetch_mem, print_protmap_entry, 0);
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return RVAL_DECODED;
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}
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#endif
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