Dmitry V. Levin
0b03de74bc
* gcc_compat.h (ATTRIBUTE_FALLTHROUGH): New macro. * block.c (block_ioctl): Use it instead of "fall through" comment. * btrfs.c (btrfs_ioctl): Likewise. * loop.c (loop_ioctl): Likewise. * mtd.c (mtd_ioctl): Likewise. * rtc.c (rtc_ioctl): Likewise. * v4l2.c (v4l2_ioctl): Likewise. * dm.c (dm_decode_values): Likewise. * process.c (SYS_FUNC(ptrace)): Likewise. * quota.c (decode_cmd_data): Likewise. * ucopy.c (umovestr): Likewise. * unwind.c (unwind_print_stacktrace, unwind_capture_stacktrace)): Likewise. * term.c (term_ioctl): Add ATTRIBUTE_FALLTHROUGH. * ioctl.c (ioctl_decode) [ALPHA || POWERPC]: Likewise. * m4/st_warn_cflags.m4 (gl_WARN_ADD): Add -Wimplicit-fallthrough=5. * tests/ioctl_v4l2.c (init_v4l2_format): Reorganize the switch statement without implicit fallthrough.
629 lines
15 KiB
C
629 lines
15 KiB
C
/*
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* Support for decoding of DM_* ioctl commands.
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*
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* Copyright (c) 2016 Mikulas Patocka <mpatocka@redhat.com>
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* Copyright (c) 2016 Masatake Yamato <yamato@redhat.com>
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* Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
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* Copyright (c) 2016-2017 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_LINUX_DM_IOCTL_H
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# include "print_fields.h"
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# include <linux/dm-ioctl.h>
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# include <linux/ioctl.h>
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# if DM_VERSION_MAJOR == 4
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/* Definitions for command which have been added later */
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# ifndef DM_LIST_VERSIONS
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# define DM_LIST_VERSIONS _IOWR(DM_IOCTL, 0x0d, struct dm_ioctl)
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# endif
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# ifndef DM_TARGET_MSG
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# define DM_TARGET_MSG _IOWR(DM_IOCTL, 0x0e, struct dm_ioctl)
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# endif
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# ifndef DM_DEV_SET_GEOMETRY
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# define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, 0x0f, struct dm_ioctl)
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# endif
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# ifndef DM_DEV_ARM_POLL
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# define DM_DEV_ARM_POLL _IOWR(DM_IOCTL, 0x10, struct dm_ioctl)
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# endif
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static void
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dm_decode_device(const unsigned int code, const struct dm_ioctl *ioc)
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{
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switch (code) {
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case DM_REMOVE_ALL:
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case DM_LIST_DEVICES:
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case DM_LIST_VERSIONS:
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break;
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default:
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if (ioc->dev)
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PRINT_FIELD_DEV(", ", *ioc, dev);
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if (ioc->name[0])
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PRINT_FIELD_CSTRING(", ", *ioc, name);
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if (ioc->uuid[0])
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PRINT_FIELD_CSTRING(", ", *ioc, uuid);
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break;
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}
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}
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static void
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dm_decode_values(struct tcb *tcp, const unsigned int code,
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const struct dm_ioctl *ioc)
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{
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if (entering(tcp)) {
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switch (code) {
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case DM_TABLE_LOAD:
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PRINT_FIELD_U(", ", *ioc, target_count);
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break;
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case DM_DEV_SUSPEND:
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if (ioc->flags & DM_SUSPEND_FLAG)
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break;
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ATTRIBUTE_FALLTHROUGH;
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case DM_DEV_RENAME:
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case DM_DEV_REMOVE:
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case DM_DEV_WAIT:
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PRINT_FIELD_U(", ", *ioc, event_nr);
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break;
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}
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} else if (!syserror(tcp)) {
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switch (code) {
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case DM_DEV_CREATE:
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case DM_DEV_RENAME:
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case DM_DEV_SUSPEND:
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case DM_DEV_STATUS:
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case DM_DEV_WAIT:
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case DM_TABLE_LOAD:
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case DM_TABLE_CLEAR:
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case DM_TABLE_DEPS:
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case DM_TABLE_STATUS:
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case DM_TARGET_MSG:
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PRINT_FIELD_U(", ", *ioc, target_count);
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PRINT_FIELD_U(", ", *ioc, open_count);
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PRINT_FIELD_U(", ", *ioc, event_nr);
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break;
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}
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}
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}
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#include "xlat/dm_flags.h"
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static void
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dm_decode_flags(const struct dm_ioctl *ioc)
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{
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PRINT_FIELD_FLAGS(", ", *ioc, flags, dm_flags, "DM_???");
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}
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static void
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dm_decode_dm_target_spec(struct tcb *const tcp, const kernel_ulong_t addr,
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const struct dm_ioctl *const ioc)
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{
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static const uint32_t target_spec_size =
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sizeof(struct dm_target_spec);
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uint32_t i;
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uint32_t offset = ioc->data_start;
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uint32_t offset_end = 0;
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if (abbrev(tcp)) {
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if (ioc->target_count)
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tprints(", ...");
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return;
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}
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for (i = 0; i < ioc->target_count; i++) {
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tprints(", ");
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if (i && offset <= offset_end)
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goto misplaced;
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offset_end = offset + target_spec_size;
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if (offset_end <= offset || offset_end > ioc->data_size)
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goto misplaced;
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if (i >= max_strlen) {
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tprints("...");
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break;
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}
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struct dm_target_spec s;
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if (umove_or_printaddr(tcp, addr + offset, &s))
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break;
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PRINT_FIELD_U("{", s, sector_start);
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PRINT_FIELD_U(", ", s, length);
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if (exiting(tcp))
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PRINT_FIELD_D(", ", s, status);
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PRINT_FIELD_CSTRING(", ", s, target_type);
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tprints(", string=");
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printstr_ex(tcp, addr + offset_end, ioc->data_size - offset_end,
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QUOTE_0_TERMINATED);
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tprints("}");
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if (entering(tcp))
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offset += s.next;
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else
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offset = ioc->data_start + s.next;
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}
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return;
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misplaced:
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tprints("???");
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tprints_comment("misplaced struct dm_target_spec");
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}
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bool
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dm_print_dev(struct tcb *tcp, void *dev_ptr, size_t dev_size, void *dummy)
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{
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uint64_t *dev = (uint64_t *) dev_ptr;
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print_dev_t(*dev);
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return 1;
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}
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static void
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dm_decode_dm_target_deps(struct tcb *const tcp, const kernel_ulong_t addr,
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const struct dm_ioctl *const ioc)
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{
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if (ioc->data_start == ioc->data_size)
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return;
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tprints(", ");
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if (abbrev(tcp)) {
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tprints("...");
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return;
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}
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static const uint32_t target_deps_dev_offs =
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offsetof(struct dm_target_deps, dev);
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uint64_t dev_buf;
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struct dm_target_deps s;
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uint32_t offset = ioc->data_start;
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uint32_t offset_end = offset + target_deps_dev_offs;
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uint32_t space;
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if (offset_end <= offset || offset_end > ioc->data_size)
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goto misplaced;
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if (umove_or_printaddr(tcp, addr + offset, &s))
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return;
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space = (ioc->data_size - offset_end) / sizeof(dev_buf);
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if (s.count > space)
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goto misplaced;
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PRINT_FIELD_U("{", s, count);
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tprints(", deps=");
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print_array(tcp, addr + offset_end, s.count, &dev_buf, sizeof(dev_buf),
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umoven_or_printaddr, dm_print_dev, NULL);
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tprints("}");
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return;
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misplaced:
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tprints("???");
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tprints_comment("misplaced struct dm_target_deps");
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}
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static void
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dm_decode_dm_name_list(struct tcb *const tcp, const kernel_ulong_t addr,
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const struct dm_ioctl *const ioc)
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{
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static const uint32_t name_list_name_offs =
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offsetof(struct dm_name_list, name);
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struct dm_name_list s;
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uint32_t offset = ioc->data_start;
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uint32_t offset_end = 0;
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uint32_t count;
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int rc;
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if (ioc->data_start == ioc->data_size)
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return;
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if (abbrev(tcp)) {
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tprints(", ...");
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return;
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}
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for (count = 0;; count++) {
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tprints(", ");
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if (count && offset <= offset_end)
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goto misplaced;
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offset_end = offset + name_list_name_offs;
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if (offset_end <= offset || offset_end > ioc->data_size)
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goto misplaced;
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if (count >= max_strlen) {
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tprints("...");
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break;
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}
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if (umove_or_printaddr(tcp, addr + offset, &s))
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break;
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PRINT_FIELD_DEV("{", s, dev);
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tprints(", name=");
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rc = printstr_ex(tcp, addr + offset_end,
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ioc->data_size - offset_end,
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QUOTE_0_TERMINATED);
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/*
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* In Linux v4.13-rc1~137^2~13 it has been decided to cram in
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* one more undocumented field after the device name, as if the
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* format decoding was not twisted enough already. So, we have
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* to check "next" now, and if it _looks like_ that there is
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* a space for one additional integer, let's print it. As if the
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* perversity with "name string going further than pointer to
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* the next one" wasn't enough. Moreover, the calculation was
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* broken for m32 on 64-bit kernels until v4.14-rc4~20^2~3, and
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* we have no ability to detect kernel bit-ness (on x86, at
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* least), so refrain from printing it for the DM versions below
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* 4.37 (the original version was also aligned differently than
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* now even on 64 bit).
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*/
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if ((rc > 0) && ioc->version[1] >= 37) {
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kernel_ulong_t event_addr =
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(addr + offset_end + rc + 7) & ~7;
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uint32_t event_nr;
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if ((event_addr + sizeof(event_nr)) <=
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(addr + offset + s.next) &&
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!umove(tcp, event_addr, &event_nr))
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tprintf(", event_nr=%" PRIu32, event_nr);
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}
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tprints("}");
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if (!s.next)
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break;
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offset += s.next;
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}
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return;
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misplaced:
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tprints("???");
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tprints_comment("misplaced struct dm_name_list");
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}
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static void
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dm_decode_dm_target_versions(struct tcb *const tcp, const kernel_ulong_t addr,
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const struct dm_ioctl *const ioc)
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{
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static const uint32_t target_vers_name_offs =
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offsetof(struct dm_target_versions, name);
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struct dm_target_versions s;
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uint32_t offset = ioc->data_start;
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uint32_t offset_end = 0;
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uint32_t count;
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if (ioc->data_start == ioc->data_size)
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return;
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if (abbrev(tcp)) {
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tprints(", ...");
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return;
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}
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for (count = 0;; count++) {
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tprints(", ");
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if (count && offset <= offset_end)
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goto misplaced;
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offset_end = offset + target_vers_name_offs;
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if (offset_end <= offset || offset_end > ioc->data_size)
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goto misplaced;
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if (count >= max_strlen) {
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tprints("...");
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break;
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}
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if (umove_or_printaddr(tcp, addr + offset, &s))
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break;
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tprints("{name=");
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printstr_ex(tcp, addr + offset_end, ioc->data_size - offset_end,
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QUOTE_0_TERMINATED);
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tprintf(", version=%" PRIu32 ".%" PRIu32 ".%" PRIu32 "}",
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s.version[0], s.version[1], s.version[2]);
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if (!s.next)
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break;
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offset += s.next;
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}
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return;
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misplaced:
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tprints("???");
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tprints_comment("misplaced struct dm_target_versions");
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}
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static void
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dm_decode_dm_target_msg(struct tcb *const tcp, const kernel_ulong_t addr,
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const struct dm_ioctl *const ioc)
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{
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if (ioc->data_start == ioc->data_size)
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return;
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tprints(", ");
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if (abbrev(tcp)) {
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tprints("...");
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return;
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}
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static const uint32_t target_msg_message_offs =
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offsetof(struct dm_target_msg, message);
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uint32_t offset = ioc->data_start;
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uint32_t offset_end = offset + target_msg_message_offs;
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if (offset_end > offset && offset_end <= ioc->data_size) {
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struct dm_target_msg s;
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if (umove_or_printaddr(tcp, addr + offset, &s))
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return;
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PRINT_FIELD_U("{", s, sector);
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tprints(", message=");
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printstr_ex(tcp, addr + offset_end, ioc->data_size - offset_end,
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QUOTE_0_TERMINATED);
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tprints("}");
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} else {
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tprints("???");
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tprints_comment("misplaced struct dm_target_msg");
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}
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}
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static void
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dm_decode_string(struct tcb *const tcp, const kernel_ulong_t addr,
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const struct dm_ioctl *const ioc)
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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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return;
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}
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|
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uint32_t offset = ioc->data_start;
|
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|
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if (offset <= ioc->data_size) {
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tprints("string=");
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printstr_ex(tcp, addr + offset, ioc->data_size - offset,
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QUOTE_0_TERMINATED);
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} else {
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tprints("???");
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tprints_comment("misplaced string");
|
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}
|
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}
|
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|
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static inline bool
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dm_ioctl_has_params(const unsigned int code)
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{
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switch (code) {
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case DM_VERSION:
|
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case DM_REMOVE_ALL:
|
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case DM_DEV_CREATE:
|
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case DM_DEV_REMOVE:
|
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case DM_DEV_SUSPEND:
|
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case DM_DEV_STATUS:
|
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case DM_TABLE_CLEAR:
|
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case DM_DEV_ARM_POLL:
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return false;
|
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}
|
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|
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return true;
|
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}
|
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|
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static int
|
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dm_known_ioctl(struct tcb *const tcp, const unsigned int code,
|
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const kernel_ulong_t arg)
|
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{
|
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struct dm_ioctl *ioc = NULL;
|
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struct dm_ioctl *entering_ioc = NULL;
|
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bool ioc_changed = false;
|
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|
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if (entering(tcp)) {
|
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ioc = malloc(sizeof(*ioc));
|
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if (!ioc)
|
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return 0;
|
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} else {
|
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ioc = alloca(sizeof(*ioc));
|
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}
|
|
|
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if ((umoven(tcp, arg, offsetof(struct dm_ioctl, data), ioc) < 0) ||
|
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(ioc->data_size < offsetof(struct dm_ioctl, data_size))) {
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if (entering(tcp))
|
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free(ioc);
|
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return 0;
|
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}
|
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if (entering(tcp))
|
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set_tcb_priv_data(tcp, ioc, free);
|
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else {
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entering_ioc = get_tcb_priv_data(tcp);
|
|
|
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/*
|
|
* retrieve_status, __dev_status called only in case of success,
|
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* so it looks like there's no need to check open_count,
|
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* event_nr, target_count, dev fields for change (they are
|
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* printed only in case of absence of errors).
|
|
*/
|
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if (!entering_ioc ||
|
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(ioc->version[0] != entering_ioc->version[0]) ||
|
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(ioc->version[1] != entering_ioc->version[1]) ||
|
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(ioc->version[2] != entering_ioc->version[2]) ||
|
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(ioc->data_size != entering_ioc->data_size) ||
|
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(ioc->data_start != entering_ioc->data_start) ||
|
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(ioc->flags != entering_ioc->flags))
|
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ioc_changed = true;
|
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}
|
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|
|
if (exiting(tcp) && syserror(tcp) && !ioc_changed)
|
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return RVAL_IOCTL_DECODED;
|
|
|
|
/*
|
|
* device mapper code uses %d in some places and %u in another, but
|
|
* fields themselves are declared as __u32.
|
|
*/
|
|
tprintf("%s{version=%u.%u.%u", entering(tcp) ? ", " : " => ",
|
|
ioc->version[0], ioc->version[1], ioc->version[2]);
|
|
/*
|
|
* if we use a different version of ABI, do not attempt to decode
|
|
* ioctl fields
|
|
*/
|
|
if (ioc->version[0] != DM_VERSION_MAJOR) {
|
|
tprints_comment("unsupported device mapper ABI version");
|
|
goto skip;
|
|
}
|
|
|
|
PRINT_FIELD_U(", ", *ioc, data_size);
|
|
|
|
if (ioc->data_size < offsetof(struct dm_ioctl, data)) {
|
|
tprints_comment("data_size too small");
|
|
goto skip;
|
|
}
|
|
|
|
if (dm_ioctl_has_params(code))
|
|
PRINT_FIELD_U(", ", *ioc, data_start);
|
|
|
|
dm_decode_device(code, ioc);
|
|
dm_decode_values(tcp, code, ioc);
|
|
dm_decode_flags(ioc);
|
|
|
|
switch (code) {
|
|
case DM_DEV_WAIT:
|
|
case DM_TABLE_STATUS:
|
|
if (entering(tcp) || syserror(tcp))
|
|
break;
|
|
dm_decode_dm_target_spec(tcp, arg, ioc);
|
|
break;
|
|
case DM_TABLE_LOAD:
|
|
if (exiting(tcp))
|
|
break;
|
|
dm_decode_dm_target_spec(tcp, arg, ioc);
|
|
break;
|
|
case DM_TABLE_DEPS:
|
|
if (entering(tcp) || syserror(tcp))
|
|
break;
|
|
dm_decode_dm_target_deps(tcp, arg, ioc);
|
|
break;
|
|
case DM_LIST_DEVICES:
|
|
if (entering(tcp) || syserror(tcp))
|
|
break;
|
|
dm_decode_dm_name_list(tcp, arg, ioc);
|
|
break;
|
|
case DM_LIST_VERSIONS:
|
|
if (entering(tcp) || syserror(tcp))
|
|
break;
|
|
dm_decode_dm_target_versions(tcp, arg, ioc);
|
|
break;
|
|
case DM_TARGET_MSG:
|
|
if (entering(tcp))
|
|
dm_decode_dm_target_msg(tcp, arg, ioc);
|
|
else if (!syserror(tcp) && ioc->flags & DM_DATA_OUT_FLAG)
|
|
dm_decode_string(tcp, arg, ioc);
|
|
break;
|
|
case DM_DEV_RENAME:
|
|
case DM_DEV_SET_GEOMETRY:
|
|
if (exiting(tcp))
|
|
break;
|
|
dm_decode_string(tcp, arg, ioc);
|
|
break;
|
|
}
|
|
|
|
skip:
|
|
tprints("}");
|
|
return entering(tcp) ? 0 : RVAL_IOCTL_DECODED;
|
|
}
|
|
|
|
int
|
|
dm_ioctl(struct tcb *const tcp, const unsigned int code, const kernel_ulong_t arg)
|
|
{
|
|
switch (code) {
|
|
case DM_VERSION:
|
|
case DM_REMOVE_ALL:
|
|
case DM_LIST_DEVICES:
|
|
case DM_DEV_CREATE:
|
|
case DM_DEV_REMOVE:
|
|
case DM_DEV_RENAME:
|
|
case DM_DEV_SUSPEND:
|
|
case DM_DEV_STATUS:
|
|
case DM_DEV_WAIT:
|
|
case DM_TABLE_LOAD:
|
|
case DM_TABLE_CLEAR:
|
|
case DM_TABLE_DEPS:
|
|
case DM_TABLE_STATUS:
|
|
case DM_LIST_VERSIONS:
|
|
case DM_TARGET_MSG:
|
|
case DM_DEV_SET_GEOMETRY:
|
|
case DM_DEV_ARM_POLL:
|
|
return dm_known_ioctl(tcp, code, arg);
|
|
default:
|
|
return RVAL_DECODED;
|
|
}
|
|
}
|
|
|
|
# else /* !(DM_VERSION_MAJOR == 4) */
|
|
|
|
int
|
|
dm_ioctl(struct tcb *const tcp, const unsigned int code, const kernel_ulong_t arg)
|
|
{
|
|
return RVAL_DECODED;
|
|
}
|
|
|
|
# endif /* DM_VERSION_MAJOR == 4 */
|
|
#endif /* HAVE_LINUX_DM_IOCTL_H */
|