Dmitry V. Levin
884d3ae479
* defs.h (RVAL_PRINT_ERR_VAL): Remove. * ldt.c (SYS_FUNC(modify_ldt)): Return 0. * syscall.c (syscall_exiting_trace): When printing an error, always print struct tcb.u_rval as if RVAL_PRINT_ERR_VAL was set.
207 lines
5.5 KiB
C
207 lines
5.5 KiB
C
/*
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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) 1993-1996 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) 2002-2004 Roland McGrath <roland@redhat.com>
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* Copyright (c) 2010 Andreas Schwab <schwab@linux-m68k.org>
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* Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2014-2018 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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#ifdef HAVE_STRUCT_USER_DESC
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# include <asm/ldt.h>
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# include "print_fields.h"
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# include "xstring.h"
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void
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print_user_desc(struct tcb *const tcp, const kernel_ulong_t addr,
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enum user_desc_print_filter filter)
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{
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struct user_desc desc;
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unsigned *entry_number = get_tcb_priv_data(tcp);
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switch (filter) {
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case USER_DESC_ENTERING:
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if (umove_or_printaddr(tcp, addr, &desc.entry_number))
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return;
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break;
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case USER_DESC_EXITING:
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if (!addr || !verbose(tcp))
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return;
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if (syserror(tcp) || umove(tcp, addr, &desc)) {
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if (entry_number)
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tprints(", ...}");
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return;
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}
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break;
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case USER_DESC_BOTH:
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if (umove_or_printaddr(tcp, addr, &desc))
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return;
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break;
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}
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if (filter & USER_DESC_ENTERING) {
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PRINT_FIELD_ID("{", desc, entry_number);
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/*
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* If we don't print the whole structure now, let's save it for
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* later.
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*/
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if (filter == USER_DESC_ENTERING) {
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entry_number = xmalloc(sizeof(*entry_number));
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*entry_number = desc.entry_number;
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set_tcb_priv_data(tcp, entry_number, free);
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}
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}
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if (filter & USER_DESC_EXITING) {
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/*
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* It should be the same in case of get_thread_area, but we can
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* never be sure...
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*/
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if (filter == USER_DESC_EXITING) {
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if (entry_number) {
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if (*entry_number != desc.entry_number) {
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if ((int) desc.entry_number == -1)
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tprints(" => -1");
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else
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tprintf(" => %u",
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desc.entry_number);
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}
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} else {
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/*
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* This is really strange. If we are here, it
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* means that we failed on entering but somehow
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* succeeded on exiting.
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*/
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PRINT_FIELD_ID(" => {", desc, entry_number);
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}
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}
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PRINT_FIELD_0X(", ", desc, base_addr);
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PRINT_FIELD_0X(", ", desc, limit);
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PRINT_FIELD_U_CAST(", ", desc, seg_32bit, unsigned int);
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PRINT_FIELD_U_CAST(", ", desc, contents, unsigned int);
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PRINT_FIELD_U_CAST(", ", desc, read_exec_only, unsigned int);
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PRINT_FIELD_U_CAST(", ", desc, limit_in_pages, unsigned int);
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PRINT_FIELD_U_CAST(", ", desc, seg_not_present, unsigned int);
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PRINT_FIELD_U_CAST(", ", desc, useable, unsigned int);
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# ifdef HAVE_STRUCT_USER_DESC_LM
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/* lm is totally ignored for 32-bit processes */
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if (current_klongsize == 8)
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PRINT_FIELD_U_CAST(", ", desc, lm, unsigned int);
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# endif /* HAVE_STRUCT_USER_DESC_LM */
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tprints("}");
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}
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}
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SYS_FUNC(modify_ldt)
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{
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if (entering(tcp)) {
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tprintf("%d, ", (int) tcp->u_arg[0]);
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if (tcp->u_arg[2] != sizeof(struct user_desc))
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printaddr(tcp->u_arg[1]);
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else
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print_user_desc(tcp, tcp->u_arg[1], USER_DESC_BOTH);
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tprintf(", %" PRI_klu, tcp->u_arg[2]);
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return 0;
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}
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/*
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* For some reason ("tht ABI for sys_modify_ldt() expects
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* 'int'"), modify_ldt clips higher bits on x86_64.
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*/
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if (syserror(tcp) || (kernel_ulong_t) tcp->u_rval < 0xfffff000)
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return 0;
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tcp->u_error = -(unsigned int) tcp->u_rval;
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return 0;
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}
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SYS_FUNC(set_thread_area)
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{
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if (entering(tcp)) {
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print_user_desc(tcp, tcp->u_arg[0], USER_DESC_BOTH);
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} else {
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struct user_desc desc;
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if (!verbose(tcp) || syserror(tcp) ||
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umove(tcp, tcp->u_arg[0], &desc) < 0) {
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/* returned entry_number is not available */
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} else {
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static char outstr[32];
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xsprintf(outstr, "entry_number=%u", desc.entry_number);
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tcp->auxstr = outstr;
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return RVAL_STR;
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}
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}
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return 0;
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}
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SYS_FUNC(get_thread_area)
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{
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print_user_desc(tcp, tcp->u_arg[0],
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entering(tcp) ? USER_DESC_ENTERING : USER_DESC_EXITING);
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return 0;
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}
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#endif /* HAVE_STRUCT_USER_DESC */
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#if defined(M68K) || defined(MIPS)
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SYS_FUNC(set_thread_area)
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{
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printaddr(tcp->u_arg[0]);
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return RVAL_DECODED;
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}
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#endif
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#if defined(M68K)
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SYS_FUNC(get_thread_area)
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{
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return RVAL_DECODED | RVAL_HEX;
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}
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#endif
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