Dmitry V. Levin
b93d52fe3d
strace is now provided under the terms of the GNU Lesser General Public License version 2.1 or later, see COPYING for more details. strace test suite is now provided under the terms of the GNU General Public License version 2 or later, see tests/COPYING for more details.
139 lines
3.1 KiB
C
139 lines
3.1 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, 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) 2005-2015 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2014-2017 The strace developers.
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* All rights reserved.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "defs.h"
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#include DEF_MPERS_TYPE(kernel_dirent)
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#include MPERS_DEFS
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#define D_NAME_LEN_MAX 256
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static void
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print_old_dirent(struct tcb *const tcp, const kernel_ulong_t addr)
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{
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kernel_dirent d;
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if (umove_or_printaddr(tcp, addr, &d))
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return;
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tprintf("{d_ino=%llu, d_off=%llu, d_reclen=%u, d_name=",
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zero_extend_signed_to_ull(d.d_ino),
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zero_extend_signed_to_ull(d.d_off), d.d_reclen);
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if (d.d_reclen > D_NAME_LEN_MAX)
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d.d_reclen = D_NAME_LEN_MAX;
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printpathn(tcp, addr + offsetof(kernel_dirent, d_name), d.d_reclen);
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tprints("}");
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}
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SYS_FUNC(readdir)
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{
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if (entering(tcp)) {
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printfd(tcp, tcp->u_arg[0]);
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tprints(", ");
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} else {
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if (tcp->u_rval == 0)
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printaddr(tcp->u_arg[1]);
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else
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print_old_dirent(tcp, tcp->u_arg[1]);
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/* Not much point in printing this out, it is always 1. */
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if (tcp->u_arg[2] != 1)
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tprintf(", %" PRI_klu, tcp->u_arg[2]);
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}
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return 0;
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}
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SYS_FUNC(getdents)
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{
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unsigned int i, len, dents = 0;
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unsigned char *buf;
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if (entering(tcp)) {
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printfd(tcp, tcp->u_arg[0]);
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return 0;
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}
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const unsigned int count = tcp->u_arg[2];
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if (syserror(tcp) || !verbose(tcp)) {
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tprints(", ");
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printaddr(tcp->u_arg[1]);
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tprintf(", %u", count);
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return 0;
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}
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/* Beware of insanely large or too small values in tcp->u_rval */
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if (tcp->u_rval > 1024*1024)
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len = 1024*1024;
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else if (tcp->u_rval < (int) sizeof(kernel_dirent))
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len = 0;
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else
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len = tcp->u_rval;
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if (len) {
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buf = malloc(len);
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if (!buf || umoven(tcp, tcp->u_arg[1], len, buf) < 0) {
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tprints(", ");
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printaddr(tcp->u_arg[1]);
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tprintf(", %u", count);
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free(buf);
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return 0;
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}
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} else {
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buf = NULL;
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}
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tprints(",");
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if (!abbrev(tcp))
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tprints(" [");
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for (i = 0; len && i <= len - sizeof(kernel_dirent); ) {
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kernel_dirent *d = (kernel_dirent *) &buf[i];
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if (!abbrev(tcp)) {
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int oob = d->d_reclen < sizeof(kernel_dirent) ||
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i + d->d_reclen - 1 >= len;
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int d_name_len = oob ? len - i : d->d_reclen;
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d_name_len -= offsetof(kernel_dirent, d_name) + 1;
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if (d_name_len > D_NAME_LEN_MAX)
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d_name_len = D_NAME_LEN_MAX;
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tprintf("%s{d_ino=%llu, d_off=%llu, d_reclen=%u"
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", d_name=", i ? ", " : "",
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zero_extend_signed_to_ull(d->d_ino),
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zero_extend_signed_to_ull(d->d_off),
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d->d_reclen);
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print_quoted_cstring(d->d_name, d_name_len);
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tprints(", d_type=");
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if (oob)
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tprints("?");
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else
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printxval(dirent_types, buf[i + d->d_reclen - 1], "DT_???");
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tprints("}");
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}
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dents++;
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if (d->d_reclen < sizeof(kernel_dirent)) {
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tprints_comment("d_reclen < sizeof(struct dirent)");
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break;
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}
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i += d->d_reclen;
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}
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if (!abbrev(tcp))
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tprints("]");
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else
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tprintf_comment("%u entries", dents);
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tprintf(", %u", count);
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free(buf);
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return 0;
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}
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