550 lines
16 KiB
C
550 lines
16 KiB
C
![]() |
/*-
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* Copyright (c) 2007 Robert N. M. Watson
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*-
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* Kernel text-dump support: write a series of text files to the dump
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* partition for later recovery, including captured DDB output, kernel
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* configuration, message buffer, and panic message. This allows for a more
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* compact representation of critical debugging information than traditional
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* binary dumps, as well as allowing dump information to be used without
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* access to kernel symbols, source code, etc.
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*
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* Storage Layout
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* --------------
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*
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* Crash dumps are aligned to the end of the dump or swap partition in order
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* to minimize the chances of swap duing fsck eating into the dump. However,
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* unlike a memory dump, we don't know the size of the textdump a priori, so
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* can't just write it out sequentially in order from a known starting point
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* calculated with respect to the end of the partition. In order to address
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* this, we actually write out the textdump in reverse block order, allowing
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* us to directly align it to the end of the partition and then write out the
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* dump header and trailer before and after it once done. savecore(8) must
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* know to reverse the order of the blocks in order to produce a readable
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* file.
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*
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* Data is written out in the ustar file format so that we can write data
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* incrementally as a stream without reference to previous files.
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*
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* TODO
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* ----
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*
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* - Allow subsystems to register to submit files for inclusion in the text
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* dump in a generic way.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_config.h"
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/kerneldump.h>
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#include <sys/msgbuf.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <ddb/ddb.h>
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#include <ddb/db_lex.h>
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static SYSCTL_NODE(_debug_ddb, OID_AUTO, textdump, CTLFLAG_RW, 0,
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"DDB textdump options");
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/*
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* Don't touch the first SIZEOF_METADATA bytes on the dump device. This is
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* to protect us from metadata and metadata from us.
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*/
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#define SIZEOF_METADATA (64*1024)
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/*
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* Data is written out as a series of files in the ustar tar format. ustar
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* is a simple streamed format consiting of a series of files prefixed with
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* headers, and all padded to 512-byte block boundaries, which maps
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* conveniently to our requirements.
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*/
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struct ustar_header {
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char uh_filename[100];
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char uh_mode[8];
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char uh_tar_owner[8];
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char uh_tar_group[8];
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char uh_size[12];
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char uh_mtime[12];
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char uh_sum[8];
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char uh_type;
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char uh_linkfile[100];
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char uh_ustar[6];
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char uh_version[2];
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char uh_owner[32];
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char uh_group[32];
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char uh_major[8];
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char uh_minor[8];
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char uh_filenameprefix[155];
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char uh_zeropad[12];
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} __packed;
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/*
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* Various size assertions -- pretty much everything must be one block in
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* size.
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*/
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CTASSERT(sizeof(struct kerneldumpheader) == TEXTDUMP_BLOCKSIZE);
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CTASSERT(sizeof(struct ustar_header) == TEXTDUMP_BLOCKSIZE);
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/*
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* Is a textdump scheduled? If so, the shutdown code will invoke our dumpsys
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* routine instead of the machine-dependent kernel dump routine.
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*/
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#ifdef TEXTDUMP_PREFERRED
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int textdump_pending = 1;
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#else
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int textdump_pending = 0;
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#endif
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SYSCTL_INT(_debug_ddb_textdump, OID_AUTO, pending, CTLFLAG_RW,
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&textdump_pending, 0,
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"Perform textdump instead of regular kernel dump.");
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/*
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* Various constants for tar headers and contents.
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*/
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#define TAR_USER "root"
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#define TAR_GROUP "wheel"
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#define TAR_UID "0"
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#define TAR_GID "0"
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#define TAR_MODE "0600"
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#define TAR_USTAR "ustar"
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#define TAR_CONFIG_FILENAME "config.txt" /* Kernel configuration. */
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#define TAR_MSGBUF_FILENAME "msgbuf.txt" /* Kernel messsage buffer. */
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#define TAR_PANIC_FILENAME "panic.txt" /* Panic message. */
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#define TAR_VERSION_FILENAME "version.txt" /* Kernel version. */
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/*
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* Configure which files will be dumped.
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*/
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#ifdef INCLUDE_CONFIG_FILE
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static int textdump_do_config = 1;
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SYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_config, CTLFLAG_RW,
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&textdump_do_config, 0, "Dump kernel configuration in textdump");
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#endif
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static int textdump_do_ddb = 1;
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SYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_ddb, CTLFLAG_RW,
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&textdump_do_ddb, 0, "Dump DDB captured output in textdump");
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static int textdump_do_msgbuf = 1;
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SYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_msgbuf, CTLFLAG_RW,
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&textdump_do_msgbuf, 0, "Dump kernel message buffer in textdump");
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static int textdump_do_panic = 1;
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SYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_panic, CTLFLAG_RW,
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&textdump_do_panic, 0, "Dump kernel panic message in textdump");
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static int textdump_do_version = 1;
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SYSCTL_INT(_debug_ddb_textdump, OID_AUTO, do_version, CTLFLAG_RW,
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&textdump_do_version, 0, "Dump kernel version string in textdump");
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/*
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* State related to incremental writing of blocks to disk.
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*/
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static off_t textdump_offset; /* Offset of next sequential write. */
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static int textdump_error; /* Carried write error, if any. */
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/*
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* Statically allocate space to prepare block-sized headers and data.
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*/
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char textdump_block_buffer[TEXTDUMP_BLOCKSIZE];
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static struct kerneldumpheader kdh;
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/*
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* Calculate and fill in the checksum for a ustar header.
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*/
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static void
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ustar_checksum(struct ustar_header *uhp)
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{
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u_int sum;
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int i;
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for (i = 0; i < sizeof(uhp->uh_sum); i++)
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uhp->uh_sum[i] = ' ';
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sum = 0;
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for (i = 0; i < sizeof(*uhp); i++)
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sum += ((u_char *)uhp)[i];
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snprintf(uhp->uh_sum, sizeof(uhp->uh_sum), "%6o", sum);
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}
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/*
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* Each file in the tarball has a block-sized header with its name and other,
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* largely hard-coded, properties.
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*/
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void
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textdump_mkustar(char *block_buffer, const char *filename, u_int size)
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{
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struct ustar_header *uhp;
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#ifdef TEXTDUMP_VERBOSE
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if (textdump_error == 0)
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printf("textdump: creating '%s'.\n", filename);
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#endif
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uhp = (struct ustar_header *)block_buffer;
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bzero(uhp, sizeof(*uhp));
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strlcpy(uhp->uh_filename, filename, sizeof(uhp->uh_filename));
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strlcpy(uhp->uh_mode, TAR_MODE, sizeof(uhp->uh_mode));
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snprintf(uhp->uh_size, sizeof(uhp->uh_size), "%o", size);
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strlcpy(uhp->uh_tar_owner, TAR_UID, sizeof(uhp->uh_tar_owner));
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strlcpy(uhp->uh_tar_group, TAR_GID, sizeof(uhp->uh_tar_group));
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strlcpy(uhp->uh_owner, TAR_USER, sizeof(uhp->uh_owner));
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strlcpy(uhp->uh_group, TAR_GROUP, sizeof(uhp->uh_group));
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snprintf(uhp->uh_mtime, sizeof(uhp->uh_mtime), "%lo",
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(unsigned long)time_second);
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uhp->uh_type = 0;
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strlcpy(uhp->uh_ustar, TAR_USTAR, sizeof(uhp->uh_ustar));
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ustar_checksum(uhp);
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}
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/*
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* textdump_writeblock() writes TEXTDUMP_BLOCKSIZE-sized blocks of data to
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* the space between di->mediaoffset and di->mediaoffset + di->mediasize. It
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* accepts an offset relative to di->mediaoffset. If we're carrying any
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* error from previous I/O, return that error and don't continue to try to
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* write. Most writers ignore the error and forge ahead on the basis that
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* there's not much you can do.
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*/
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static int
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textdump_writeblock(struct dumperinfo *di, off_t offset, char *buffer)
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{
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if (textdump_error)
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return (textdump_error);
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if (offset + TEXTDUMP_BLOCKSIZE > di->mediasize)
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return (EIO);
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if (offset < SIZEOF_METADATA)
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return (ENOSPC);
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textdump_error = dump_write(di, buffer, 0, offset + di->mediaoffset,
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TEXTDUMP_BLOCKSIZE);
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if (textdump_error)
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printf("textdump_writeblock: offset %jd, error %d\n", (intmax_t)offset,
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textdump_error);
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return (textdump_error);
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}
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/*
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* Interfaces to save and restore the dump offset, so that printers can go
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* back to rewrite a header if required, while avoiding their knowing about
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* the global layout of the blocks.
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*
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* If we ever want to support writing textdumps to tape or other
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* stream-oriented target, we'll need to remove this.
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*/
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void
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textdump_saveoff(off_t *offsetp)
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{
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*offsetp = textdump_offset;
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}
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void
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textdump_restoreoff(off_t offset)
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{
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textdump_offset = offset;
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}
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/*
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* Interface to write the "next block" relative to the current offset; since
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* we write backwards from the end of the partition, we subtract, but there's
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* no reason for the caller to know this.
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*/
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int
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textdump_writenextblock(struct dumperinfo *di, char *buffer)
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{
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int error;
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error = textdump_writeblock(di, textdump_offset, buffer);
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textdump_offset -= TEXTDUMP_BLOCKSIZE;
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return (error);
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}
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#ifdef INCLUDE_CONFIG_FILE
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extern char kernconfstring[];
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/*
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* Dump kernel configuration.
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*/
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static void
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textdump_dump_config(struct dumperinfo *di)
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{
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u_int count, fullblocks, len;
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len = strlen(kernconfstring);
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textdump_mkustar(textdump_block_buffer, TAR_CONFIG_FILENAME, len);
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(void)textdump_writenextblock(di, textdump_block_buffer);
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/*
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* Write out all full blocks directly from the string, and handle any
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* left-over bits by copying it to out to the local buffer and
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* zero-padding it.
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*/
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fullblocks = len / TEXTDUMP_BLOCKSIZE;
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for (count = 0; count < fullblocks; count++)
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(void)textdump_writenextblock(di, kernconfstring + count *
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TEXTDUMP_BLOCKSIZE);
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if (len % TEXTDUMP_BLOCKSIZE != 0) {
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bzero(textdump_block_buffer, TEXTDUMP_BLOCKSIZE);
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bcopy(kernconfstring + count * TEXTDUMP_BLOCKSIZE,
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textdump_block_buffer, len % TEXTDUMP_BLOCKSIZE);
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(void)textdump_writenextblock(di, textdump_block_buffer);
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}
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}
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#endif /* INCLUDE_CONFIG_FILE */
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/*
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* Dump kernel message buffer.
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*/
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static void
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textdump_dump_msgbuf(struct dumperinfo *di)
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{
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off_t end_offset, tarhdr_offset;
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u_int i, len, offset, seq, total_len;
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char buf[16];
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/*
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* Write out a dummy tar header to advance the offset; we'll rewrite
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* it later once we know the true size.
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*/
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textdump_saveoff(&tarhdr_offset);
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textdump_mkustar(textdump_block_buffer, TAR_MSGBUF_FILENAME, 0);
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(void)textdump_writenextblock(di, textdump_block_buffer);
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/*
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* Copy out the data in small chunks, but don't copy nuls that may be
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* present if the message buffer has not yet completely filled at
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* least once.
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*/
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total_len = 0;
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offset = 0;
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msgbuf_peekbytes(msgbufp, NULL, 0, &seq);
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while ((len = msgbuf_peekbytes(msgbufp, buf, sizeof(buf), &seq)) > 0) {
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for (i = 0; i < len; i++) {
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if (buf[i] == '\0')
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continue;
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textdump_block_buffer[offset] = buf[i];
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offset++;
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if (offset != sizeof(textdump_block_buffer))
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continue;
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(void)textdump_writenextblock(di,
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textdump_block_buffer);
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total_len += offset;
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offset = 0;
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}
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}
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total_len += offset; /* Without the zero-padding. */
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if (offset != 0) {
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bzero(textdump_block_buffer + offset,
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sizeof(textdump_block_buffer) - offset);
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(void)textdump_writenextblock(di, textdump_block_buffer);
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}
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/*
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* Rewrite tar header to reflect how much was actually written.
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*/
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textdump_saveoff(&end_offset);
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textdump_restoreoff(tarhdr_offset);
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textdump_mkustar(textdump_block_buffer, TAR_MSGBUF_FILENAME,
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total_len);
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(void)textdump_writenextblock(di, textdump_block_buffer);
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textdump_restoreoff(end_offset);
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}
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static void
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textdump_dump_panic(struct dumperinfo *di)
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{
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u_int len;
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/*
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* Write out tar header -- we store up to one block of panic message.
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*/
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len = min(strlen(panicstr), TEXTDUMP_BLOCKSIZE);
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textdump_mkustar(textdump_block_buffer, TAR_PANIC_FILENAME, len);
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(void)textdump_writenextblock(di, textdump_block_buffer);
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/*
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* Zero-pad the panic string and write out block.
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*/
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bzero(textdump_block_buffer, sizeof(textdump_block_buffer));
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bcopy(panicstr, textdump_block_buffer, len);
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(void)textdump_writenextblock(di, textdump_block_buffer);
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}
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static void
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textdump_dump_version(struct dumperinfo *di)
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{
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u_int len;
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/*
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* Write out tar header -- at most one block of version information.
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*/
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len = min(strlen(version), TEXTDUMP_BLOCKSIZE);
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textdump_mkustar(textdump_block_buffer, TAR_VERSION_FILENAME, len);
|
||
|
(void)textdump_writenextblock(di, textdump_block_buffer);
|
||
|
|
||
|
/*
|
||
|
* Zero pad the version string and write out block.
|
||
|
*/
|
||
|
bzero(textdump_block_buffer, sizeof(textdump_block_buffer));
|
||
|
bcopy(version, textdump_block_buffer, len);
|
||
|
(void)textdump_writenextblock(di, textdump_block_buffer);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Commit text dump to disk.
|
||
|
*/
|
||
|
void
|
||
|
textdump_dumpsys(struct dumperinfo *di)
|
||
|
{
|
||
|
off_t dumplen, trailer_offset;
|
||
|
|
||
|
if (di->blocksize != TEXTDUMP_BLOCKSIZE) {
|
||
|
printf("Dump partition block size (%ju) not textdump "
|
||
|
"block size (%ju)", (uintmax_t)di->blocksize,
|
||
|
(uintmax_t)TEXTDUMP_BLOCKSIZE);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We don't know a priori how large the dump will be, but we do know
|
||
|
* that we need to reserve space for metadata and that we need two
|
||
|
* dump headers. Also leave room for one ustar header and one block
|
||
|
* of data.
|
||
|
*/
|
||
|
if (di->mediasize < SIZEOF_METADATA + 2 * sizeof(kdh)) {
|
||
|
printf("Insufficient space on dump partition for minimal textdump.\n");
|
||
|
return;
|
||
|
}
|
||
|
textdump_error = 0;
|
||
|
|
||
|
/*
|
||
|
* Position the start of the dump so that we'll write the kernel dump
|
||
|
* trailer immediately before the end of the partition, and then work
|
||
|
* our way back. We will rewrite this header later to reflect the
|
||
|
* true size if things go well.
|
||
|
*/
|
||
|
textdump_offset = di->mediasize - sizeof(kdh);
|
||
|
textdump_saveoff(&trailer_offset);
|
||
|
mkdumpheader(&kdh, TEXTDUMPMAGIC, KERNELDUMP_TEXT_VERSION, 0, TEXTDUMP_BLOCKSIZE);
|
||
|
(void)textdump_writenextblock(di, (char *)&kdh);
|
||
|
|
||
|
/*
|
||
|
* Write a series of files in ustar format.
|
||
|
*/
|
||
|
if (textdump_do_ddb)
|
||
|
db_capture_dump(di);
|
||
|
#ifdef INCLUDE_CONFIG_FILE
|
||
|
if (textdump_do_config)
|
||
|
textdump_dump_config(di);
|
||
|
#endif
|
||
|
if (textdump_do_msgbuf)
|
||
|
textdump_dump_msgbuf(di);
|
||
|
if (textdump_do_panic && panicstr != NULL)
|
||
|
textdump_dump_panic(di);
|
||
|
if (textdump_do_version)
|
||
|
textdump_dump_version(di);
|
||
|
|
||
|
/*
|
||
|
* Now that we know the true size, we can write out the header, then
|
||
|
* seek back to the end and rewrite the trailer with the correct
|
||
|
* size.
|
||
|
*/
|
||
|
dumplen = trailer_offset - (textdump_offset + TEXTDUMP_BLOCKSIZE);
|
||
|
mkdumpheader(&kdh, TEXTDUMPMAGIC, KERNELDUMP_TEXT_VERSION, dumplen,
|
||
|
TEXTDUMP_BLOCKSIZE);
|
||
|
(void)textdump_writenextblock(di, (char *)&kdh);
|
||
|
textdump_restoreoff(trailer_offset);
|
||
|
(void)textdump_writenextblock(di, (char *)&kdh);
|
||
|
|
||
|
/*
|
||
|
* Terminate the dump, report any errors, and clear the pending flag.
|
||
|
*/
|
||
|
if (textdump_error == 0)
|
||
|
(void)dump_write(di, NULL, 0, 0, 0);
|
||
|
if (textdump_error == ENOSPC)
|
||
|
printf("Textdump: Insufficient space on dump partition\n");
|
||
|
else if (textdump_error != 0)
|
||
|
printf("Textdump: Error %d writing dump\n", textdump_error);
|
||
|
else
|
||
|
printf("Textdump complete.\n");
|
||
|
textdump_pending = 0;
|
||
|
}
|
||
|
|
||
|
/*-
|
||
|
* DDB(4) command to manage textdumps:
|
||
|
*
|
||
|
* textdump set - request a textdump
|
||
|
* textdump status - print DDB output textdump status
|
||
|
* textdump unset - clear textdump request
|
||
|
*/
|
||
|
static void
|
||
|
db_textdump_usage(void)
|
||
|
{
|
||
|
|
||
|
db_printf("textdump [unset|set|status|dump]\n");
|
||
|
}
|
||
|
|
||
|
void
|
||
|
db_textdump_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
|
||
|
{
|
||
|
int t;
|
||
|
|
||
|
t = db_read_token();
|
||
|
if (t != tIDENT) {
|
||
|
db_textdump_usage();
|
||
|
return;
|
||
|
}
|
||
|
if (db_read_token() != tEOL) {
|
||
|
db_textdump_usage();
|
||
|
return;
|
||
|
}
|
||
|
if (strcmp(db_tok_string, "set") == 0) {
|
||
|
textdump_pending = 1;
|
||
|
db_printf("textdump set\n");
|
||
|
} else if (strcmp(db_tok_string, "status") == 0) {
|
||
|
if (textdump_pending)
|
||
|
db_printf("textdump is set\n");
|
||
|
else
|
||
|
db_printf("textdump is not set\n");
|
||
|
} else if (strcmp(db_tok_string, "unset") == 0) {
|
||
|
textdump_pending = 0;
|
||
|
db_printf("textdump unset\n");
|
||
|
} else if (strcmp(db_tok_string, "dump") == 0) {
|
||
|
textdump_pending = 1;
|
||
|
doadump(true);
|
||
|
} else {
|
||
|
db_textdump_usage();
|
||
|
}
|
||
|
}
|