mirror of
https://github.com/freebsd/freebsd-src.git
synced 2026-10-28 11:25:21 +01:00
Dag-Erling Smørgrav
cdfc673811
Fix nlist(3) consumers that either expected our toolchain to prepend an
underscore to symbol names or expected nlist(3) to ignore the mismatch,
as it did until we overhauled it back in May.
While here, also fix cases where the last element in the list had an
empty string instead of NULL as sentinel.
MFC after: 3 days
Fixes: 4617a6cb82 ("nlist: Handle multiple symbol tables")
Reviewed by: kib, jhb
Differential Revision: https://reviews.freebsd.org/D59254
404 lines
9.8 KiB
C
404 lines
9.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2002 Jake Burkholder
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* Copyright (c) 2004 Robert 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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#include <sys/types.h>
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#include <sys/capsicum.h>
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#include <sys/ktr.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <capsicum_helpers.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <nlist.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define SBUFLEN 128
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#define USAGE \
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"usage: ktrdump [-cflqrtH] [-i ktrfile] [-M core] [-N system] [-o outfile]\n"
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static void usage(void) __dead2;
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static struct nlist nl[] = {
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{ .n_name = "ktr_version" },
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{ .n_name = "ktr_entries" },
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{ .n_name = "ktr_idx" },
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{ .n_name = "ktr_buf" },
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{ .n_name = NULL }
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};
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static int cflag;
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static int fflag;
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static int lflag;
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static int Mflag;
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static int Nflag;
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static int qflag;
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static int rflag;
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static int tflag;
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static int iflag;
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static int hflag;
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static char corefile[PATH_MAX];
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static char execfile[PATH_MAX];
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static char outfile[PATH_MAX] = "stdout";
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static char desc[SBUFLEN];
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static char errbuf[_POSIX2_LINE_MAX];
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static char fbuf[PATH_MAX];
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static char obuf[PATH_MAX];
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static char sbuf[KTR_PARMS][SBUFLEN];
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/*
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* Reads the ktr trace buffer from kernel memory and prints the trace entries.
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*/
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int
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main(int ac, char **av)
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{
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u_long parms[KTR_PARMS];
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struct ktr_entry *buf;
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uintmax_t tlast, tnow;
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unsigned long bufptr;
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cap_rights_t rights;
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struct stat sb;
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kvm_t *kd;
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FILE *out;
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char *p;
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int version;
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int entries;
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int count;
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int index, index2;
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int parm;
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int in;
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int c;
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int i = 0;
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/*
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* Parse commandline arguments.
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*/
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out = stdout;
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while ((c = getopt(ac, av, "cflqrtHe:i:m:M:N:o:")) != -1)
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switch (c) {
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case 'c':
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cflag = 1;
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break;
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case 'N':
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case 'e':
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if (strlcpy(execfile, optarg, sizeof(execfile))
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>= sizeof(execfile))
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errx(1, "%s: File name too long", optarg);
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Nflag = 1;
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break;
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case 'f':
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fflag = 1;
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break;
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case 'i':
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iflag = 1;
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if ((in = open(optarg, O_RDONLY)) == -1)
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err(1, "%s", optarg);
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cap_rights_init(&rights, CAP_FSTAT, CAP_MMAP_R);
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if (caph_rights_limit(in, &rights) < 0)
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err(1, "unable to limit rights for %s",
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optarg);
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break;
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case 'l':
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lflag = 1;
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break;
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case 'M':
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case 'm':
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if (strlcpy(corefile, optarg, sizeof(corefile))
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>= sizeof(corefile))
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errx(1, "%s: File name too long", optarg);
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Mflag = 1;
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break;
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case 'o':
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if ((out = fopen(optarg, "w")) == NULL)
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err(1, "%s", optarg);
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strlcpy(outfile, optarg, sizeof(outfile));
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break;
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case 'q':
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qflag++;
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break;
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case 'r':
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rflag = 1;
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break;
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case 't':
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tflag = 1;
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break;
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case 'H':
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hflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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ac -= optind;
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av += optind;
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if (ac != 0)
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usage();
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if (caph_limit_stream(fileno(out), CAPH_WRITE) < 0)
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err(1, "unable to limit rights for %s", outfile);
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if (caph_limit_stderr() < 0)
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err(1, "unable to limit rights for stderr");
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/*
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* Open our execfile and corefile, resolve needed symbols and read in
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* the trace buffer.
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*/
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if ((kd = kvm_openfiles(Nflag ? execfile : NULL,
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Mflag ? corefile : NULL, NULL, O_RDONLY, errbuf)) == NULL)
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errx(1, "%s", errbuf);
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/*
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* Cache NLS data, for strerror, for err(3), before entering capability
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* mode.
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*/
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caph_cache_catpages();
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count = kvm_nlist(kd, nl);
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if (count == -1)
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errx(1, "%s", kvm_geterr(kd));
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if (count > 0)
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errx(1, "failed to resolve ktr symbols");
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if (kvm_read(kd, nl[0].n_value, &version, sizeof(version)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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if (version != KTR_VERSION)
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errx(1, "ktr version mismatch");
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/*
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* Enter Capsicum sandbox.
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*
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* kvm_nlist() above uses kldsym(2) for native kernels, and that isn't
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* allowed in the sandbox.
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*/
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if (caph_enter() < 0)
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err(1, "unable to enter capability mode");
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if (iflag) {
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if (fstat(in, &sb) == -1)
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errx(1, "stat");
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entries = sb.st_size / sizeof(*buf);
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index = 0;
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buf = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, in, 0);
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if (buf == MAP_FAILED)
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errx(1, "mmap");
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} else {
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if (kvm_read(kd, nl[1].n_value, &entries, sizeof(entries))
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== -1)
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errx(1, "%s", kvm_geterr(kd));
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if ((buf = malloc(sizeof(*buf) * entries)) == NULL)
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err(1, NULL);
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if (kvm_read(kd, nl[2].n_value, &index, sizeof(index)) == -1 ||
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kvm_read(kd, nl[3].n_value, &bufptr,
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sizeof(bufptr)) == -1 ||
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kvm_read(kd, bufptr, buf, sizeof(*buf) * entries) == -1 ||
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kvm_read(kd, nl[2].n_value, &index2, sizeof(index2)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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}
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/*
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* Print a nice header.
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*/
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if (!qflag) {
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fprintf(out, "%-6s ", "index");
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if (cflag)
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fprintf(out, "%-3s ", "cpu");
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if (tflag)
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fprintf(out, "%-16s ", "timestamp");
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if (fflag)
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fprintf(out, "%-40s ", "file and line");
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if (hflag)
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fprintf(out, "%-18s ", "tid");
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fprintf(out, "%s", "trace");
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fprintf(out, "\n");
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fprintf(out, "------ ");
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if (cflag)
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fprintf(out, "--- ");
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if (tflag)
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fprintf(out, "---------------- ");
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if (fflag)
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fprintf(out,
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"---------------------------------------- ");
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if (hflag)
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fprintf(out, "------------------ ");
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fprintf(out, "----- ");
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fprintf(out, "\n");
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}
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tlast = UINTPTR_MAX;
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/*
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* Now tear through the trace buffer.
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*
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* In "live" mode, find the oldest entry (first non-NULL entry
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* after index2) and walk forward. Otherwise, start with the
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* most recent entry and walk backwards.
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*/
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if (!iflag) {
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if (lflag) {
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i = index2 + 1 % entries;
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while (buf[i].ktr_desc == NULL && i != index) {
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i++;
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if (i == entries)
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i = 0;
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}
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} else {
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i = index - 1;
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if (i < 0)
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i = entries - 1;
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}
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}
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dump_entries:
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for (;;) {
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if (buf[i].ktr_desc == NULL)
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break;
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if (kvm_read(kd, (u_long)buf[i].ktr_desc, desc,
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sizeof(desc)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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desc[sizeof(desc) - 1] = '\0';
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parm = 0;
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for (p = desc; (c = *p++) != '\0';) {
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if (c != '%')
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continue;
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next: if ((c = *p++) == '\0')
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break;
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if (c == '%')
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continue;
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if (parm == KTR_PARMS)
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errx(1, "too many parameters in \"%s\"", desc);
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switch (c) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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case '#': case '-': case ' ': case '+': case '\'':
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case 'h': case 'l': case 'j': case 't': case 'z':
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case 'q': case 'L': case '.':
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goto next;
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case 's':
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if (kvm_read(kd, (u_long)buf[i].ktr_parms[parm],
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sbuf[parm], sizeof(sbuf[parm])) == -1)
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strcpy(sbuf[parm], "(null)");
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sbuf[parm][sizeof(sbuf[0]) - 1] = '\0';
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parms[parm] = (u_long)sbuf[parm];
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parm++;
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break;
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default:
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parms[parm] = buf[i].ktr_parms[parm];
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parm++;
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break;
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}
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}
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fprintf(out, "%6d ", i);
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if (cflag)
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fprintf(out, "%3d ", buf[i].ktr_cpu);
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if (tflag) {
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tnow = (uintmax_t)buf[i].ktr_timestamp;
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if (rflag) {
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if (tlast == UINTPTR_MAX)
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tlast = tnow;
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fprintf(out, "%16ju ", !iflag ? tlast - tnow :
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tnow - tlast);
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tlast = tnow;
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} else
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fprintf(out, "%16ju ", tnow);
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}
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if (fflag) {
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if (kvm_read(kd, (u_long)buf[i].ktr_file, fbuf,
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sizeof(fbuf)) == -1)
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strcpy(fbuf, "(null)");
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snprintf(obuf, sizeof(obuf), "%s:%d", fbuf,
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buf[i].ktr_line);
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fprintf(out, "%-40s ", obuf);
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}
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if (hflag)
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fprintf(out, "%p ", buf[i].ktr_thread);
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fprintf(out, desc, parms[0], parms[1], parms[2], parms[3],
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parms[4], parms[5]);
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fprintf(out, "\n");
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if (!iflag) {
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/*
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* 'index' and 'index2' are the values of 'ktr_idx'
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* before and after the KTR buffer was copied into
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* 'buf'. Since the KTR entries between 'index' and
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* 'index2' were in flux while the KTR buffer was
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* being copied to userspace we don't dump them.
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*/
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if (lflag) {
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if (++i == entries)
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i = 0;
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if (i == index)
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break;
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} else {
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if (i == index2)
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break;
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if (--i < 0)
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i = entries - 1;
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}
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} else {
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if (++i == entries)
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break;
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}
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}
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/*
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* In "live" mode, poll 'ktr_idx' periodically and dump any
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* new entries since our last pass through the ring.
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*/
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if (lflag && !iflag) {
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while (index == index2) {
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usleep(50 * 1000);
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if (kvm_read(kd, nl[2].n_value, &index2,
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sizeof(index2)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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}
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i = index;
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index = index2;
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if (kvm_read(kd, bufptr, buf, sizeof(*buf) * entries) == -1 ||
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kvm_read(kd, nl[2].n_value, &index2, sizeof(index2)) == -1)
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errx(1, "%s", kvm_geterr(kd));
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goto dump_entries;
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}
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return (0);
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}
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static void
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usage(void)
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{
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fprintf(stderr, USAGE);
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exit(1);
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}
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