mirror of
https://github.com/freebsd/freebsd-src
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Make gcore work for ELF.
This commit is contained in:
John Polstra
parent
4e108bf052
commit
52e7cc0a90
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=40525
5 changed files with 619 additions and 93 deletions
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@ -1,7 +1,8 @@
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# @(#)Makefile 8.1 (Berkeley) 6/6/93
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PROG= gcore
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SRCS= gcore.c
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SRCS= elfcore.c gcore.c
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CFLAGS+=-Wall
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DPADD= ${LIBKVM}
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LDADD= -lkvm
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@ -42,7 +42,7 @@ static const char copyright[] =
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static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
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#endif
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static const char rcsid[] =
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"$Id: gcore.c,v 1.9 1998/09/14 10:09:30 des Exp $";
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"$Id: gcore.c,v 1.10 1998/10/14 16:16:50 jdp Exp $";
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#endif /* not lint */
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/*
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@ -81,7 +81,7 @@ static const char rcsid[] =
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void core __P((int, int, struct kinfo_proc *));
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void datadump __P((int, int, struct proc *, u_long, int));
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void usage __P((void));
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void usage __P((void)) __dead2;
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void userdump __P((int, struct proc *, u_long, int));
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kvm_t *kd;
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@ -97,11 +97,12 @@ main(argc, argv)
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char *argv[];
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{
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register struct proc *p;
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struct kinfo_proc *ki;
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struct kinfo_proc *ki = NULL;
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struct exec exec;
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int ch, cnt, efd, fd, pid, sflag, uid;
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char *binfile, *corefile;
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char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1];
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int is_aout;
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sflag = 0;
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corefile = NULL;
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@ -137,27 +138,53 @@ main(argc, argv)
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usage();
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}
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kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
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if (kd == NULL)
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errx(1, "%s", errbuf);
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efd = open(binfile, O_RDONLY, 0);
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if (efd < 0)
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err(1, "%s", binfile);
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uid = getuid();
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cnt = read(efd, &exec, sizeof(exec));
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if (cnt != sizeof(exec))
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errx(1, "%s exec header: %s",
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binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
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if (!N_BADMAG(exec)) {
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is_aout = 1;
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/*
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* This legacy a.out support uses the kvm interface instead
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* of procfs.
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*/
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kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
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if (kd == NULL)
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errx(1, "%s", errbuf);
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ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
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if (ki == NULL || cnt != 1)
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errx(1, "%d: not found", pid);
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uid = getuid();
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p = &ki->kp_proc;
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if (ki->kp_eproc.e_pcred.p_ruid != uid && uid != 0)
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errx(1, "%d: not owner", pid);
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ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
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if (ki == NULL || cnt != 1)
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errx(1, "%d: not found", pid);
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if (p->p_stat == SZOMB)
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errx(1, "%d: zombie", pid);
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p = &ki->kp_proc;
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if (ki->kp_eproc.e_pcred.p_ruid != uid && uid != 0)
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errx(1, "%d: not owner", pid);
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if (p->p_flag & P_WEXIT)
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errx(1, "%d: process exiting", pid);
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if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */
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errx(1, "%d: system process", pid);
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if (p->p_stat == SZOMB)
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errx(1, "%d: zombie", pid);
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if (p->p_flag & P_WEXIT)
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errx(1, "%d: process exiting", pid);
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if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */
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errx(1, "%d: system process", pid);
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if (exec.a_text != ptoa(ki->kp_eproc.e_vm.vm_tsize))
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errx(1, "The executable %s does not belong to"
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" process %d!\n"
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"Text segment size (in bytes): executable %d,"
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" process %d", binfile, pid, exec.a_text,
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ptoa(ki->kp_eproc.e_vm.vm_tsize));
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data_offset = N_DATOFF(exec);
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} else if (IS_ELF(*(Elf_Ehdr *)&exec)) {
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is_aout = 0;
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close(efd);
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} else
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errx(1, "Invalid executable file");
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if (corefile == NULL) {
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(void)snprintf(fname, sizeof(fname), "core.%d", pid);
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@ -167,36 +194,13 @@ main(argc, argv)
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if (fd < 0)
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err(1, "%s", corefile);
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efd = open(binfile, O_RDONLY, 0);
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if (efd < 0)
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err(1, "%s", binfile);
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cnt = read(efd, &exec, sizeof(exec));
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if (cnt != sizeof(exec))
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errx(1, "%s exec header: %s",
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binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
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if (N_BADMAG(exec)) {
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const Elf_Ehdr *ehdr = (const Elf_Ehdr *)&exec;
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if (IS_ELF(*ehdr))
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errx(1, "ELF executables are not supported yet");
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errx(1, "Invalid executable file");
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}
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/* check the text segment size of the executable and the process */
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if (exec.a_text != ptoa(ki->kp_eproc.e_vm.vm_tsize))
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errx(1,
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"The executable %s does not belong to process %d!\n"
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"Text segment size (in bytes): executable %d, process %d",
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binfile, pid, exec.a_text,
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ptoa(ki->kp_eproc.e_vm.vm_tsize));
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data_offset = N_DATOFF(exec);
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if (sflag && kill(pid, SIGSTOP) < 0)
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err(1, "%d: stop signal", pid);
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core(efd, fd, ki);
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if (is_aout)
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core(efd, fd, ki);
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else
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elf_coredump(fd, pid);
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if (sflag && kill(pid, SIGCONT) < 0)
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err(1, "%d: continue signal", pid);
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513
usr.bin/gcore/elfcore.c
Normal file
513
usr.bin/gcore/elfcore.c
Normal file
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@ -0,0 +1,513 @@
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/*-
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* Copyright (c) 1998 John D. Polstra
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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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* $Id$
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*/
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/procfs.h>
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#include <vm/vm_param.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_prot.h>
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#include <elf.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 <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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#include "extern.h"
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/*
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* Code for generating ELF core dumps.
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*/
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typedef void (*segment_callback)(vm_map_entry_t, void *);
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/* Closure for cb_put_phdr(). */
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struct phdr_closure {
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Elf_Phdr *phdr; /* Program header to fill in */
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Elf_Off offset; /* Offset of segment in core file */
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};
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/* Closure for cb_size_segment(). */
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struct sseg_closure {
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int count; /* Count of writable segments. */
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size_t size; /* Total size of all writable segments. */
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};
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static void cb_put_phdr(vm_map_entry_t, void *);
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static void cb_size_segment(vm_map_entry_t, void *);
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static void each_writable_segment(vm_map_entry_t, segment_callback,
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void *closure);
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static void elf_corehdr(int fd, pid_t, vm_map_entry_t, int numsegs,
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void *hdr, size_t hdrsize);
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static void elf_puthdr(vm_map_entry_t, void *, size_t *,
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const prstatus_t *, const prfpregset_t *, const prpsinfo_t *, int numsegs);
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static void elf_putnote(void *dst, size_t *off, const char *name, int type,
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const void *desc, size_t descsz);
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static void freemap(vm_map_entry_t);
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static void readhdrinfo(pid_t, prstatus_t *, prfpregset_t *, prpsinfo_t *);
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static vm_map_entry_t readmap(pid_t);
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/*
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* Write an ELF coredump for the given pid to the given fd.
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*/
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void
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elf_coredump(int fd, pid_t pid)
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{
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vm_map_entry_t map;
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struct sseg_closure seginfo;
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void *hdr;
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size_t hdrsize;
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char memname[64];
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int memfd;
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Elf_Phdr *php;
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int i;
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/* Get the program's memory map. */
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map = readmap(pid);
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/* Size the program segments. */
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seginfo.count = 0;
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seginfo.size = 0;
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each_writable_segment(map, cb_size_segment, &seginfo);
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/*
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* Calculate the size of the core file header area by making
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* a dry run of generating it. Nothing is written, but the
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* size is calculated.
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*/
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hdrsize = 0;
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elf_puthdr(map, (void *)NULL, &hdrsize,
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(const prstatus_t *)NULL, (const prfpregset_t *)NULL,
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(const prpsinfo_t *)NULL, seginfo.count);
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/*
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* Allocate memory for building the header, fill it up,
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* and write it out.
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*/
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hdr = malloc(hdrsize);
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if ((hdr = malloc(hdrsize)) == NULL)
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errx(1, "out of memory");
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elf_corehdr(fd, pid, map, seginfo.count, hdr, hdrsize);
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/* Write the contents of all of the writable segments. */
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snprintf(memname, sizeof memname, "/proc/%d/mem", pid);
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if ((memfd = open(memname, O_RDONLY)) == -1)
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err(1, "cannot open %s", memname);
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php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
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for (i = 0; i < seginfo.count; i++) {
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int nleft = php->p_filesz;
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lseek(memfd, (off_t)php->p_vaddr, SEEK_SET);
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while (nleft > 0) {
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char buf[8*1024];
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int nwant;
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int ngot;
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nwant = nleft;
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if (nwant > sizeof buf)
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nwant = sizeof buf;
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ngot = read(memfd, buf, nwant);
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if (ngot == -1)
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err(1, "read from %s", memname);
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if (ngot < nwant)
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errx(1, "short read from %s:"
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" wanted %d, got %d\n", nwant, ngot);
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ngot = write(fd, buf, nwant);
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if (ngot == -1)
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err(1, "write of segment %d failed", i);
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if (ngot != nwant)
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errx(1, "short write");
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nleft -= nwant;
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}
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php++;
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}
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close(memfd);
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free(hdr);
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freemap(map);
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}
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/*
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* A callback for each_writable_segment() to write out the segment's
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* program header entry.
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*/
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static void
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cb_put_phdr(vm_map_entry_t entry, void *closure)
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{
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struct phdr_closure *phc = (struct phdr_closure *)closure;
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Elf_Phdr *phdr = phc->phdr;
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phc->offset = round_page(phc->offset);
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phdr->p_type = PT_LOAD;
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phdr->p_offset = phc->offset;
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phdr->p_vaddr = entry->start;
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phdr->p_paddr = 0;
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phdr->p_filesz = phdr->p_memsz = entry->end - entry->start;
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phdr->p_align = PAGE_SIZE;
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phdr->p_flags = 0;
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if (entry->protection & VM_PROT_READ)
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phdr->p_flags |= PF_R;
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if (entry->protection & VM_PROT_WRITE)
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phdr->p_flags |= PF_W;
|
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if (entry->protection & VM_PROT_EXECUTE)
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phdr->p_flags |= PF_X;
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phc->offset += phdr->p_filesz;
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phc->phdr++;
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}
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|
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/*
|
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* A callback for each_writable_segment() to gather information about
|
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* the number of segments and their total size.
|
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*/
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static void
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cb_size_segment(vm_map_entry_t entry, void *closure)
|
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{
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struct sseg_closure *ssc = (struct sseg_closure *)closure;
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ssc->count++;
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ssc->size += entry->end - entry->start;
|
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}
|
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|
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/*
|
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* For each segment in the given memory map, call the given function
|
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* with a pointer to the map entry and some arbitrary caller-supplied
|
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* data.
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*/
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static void
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each_writable_segment(vm_map_entry_t map, segment_callback func, void *closure)
|
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{
|
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vm_map_entry_t entry;
|
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|
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for (entry = map; entry != NULL; entry = entry->next)
|
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(*func)(entry, closure);
|
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}
|
||||
|
||||
/*
|
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* Write the core file header to the file, including padding up to
|
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* the page boundary.
|
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*/
|
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static void
|
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elf_corehdr(int fd, pid_t pid, vm_map_entry_t map, int numsegs, void *hdr,
|
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size_t hdrsize)
|
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{
|
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size_t off;
|
||||
prstatus_t status;
|
||||
prfpregset_t fpregset;
|
||||
prpsinfo_t psinfo;
|
||||
|
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/* Gather the information for the header. */
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readhdrinfo(pid, &status, &fpregset, &psinfo);
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|
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/* Fill in the header. */
|
||||
memset(hdr, 0, hdrsize);
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off = 0;
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elf_puthdr(map, hdr, &off, &status, &fpregset, &psinfo, numsegs);
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|
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/* Write it to the core file. */
|
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if (write(fd, hdr, hdrsize) == -1)
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err(1, "write");
|
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}
|
||||
|
||||
/*
|
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* Generate the ELF coredump header into the buffer at "dst". "dst" may
|
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* be NULL, in which case the header is sized but not actually generated.
|
||||
*/
|
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static void
|
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elf_puthdr(vm_map_entry_t map, void *dst, size_t *off, const prstatus_t *status,
|
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const prfpregset_t *fpregset, const prpsinfo_t *psinfo, int numsegs)
|
||||
{
|
||||
size_t ehoff;
|
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size_t phoff;
|
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size_t noteoff;
|
||||
size_t notesz;
|
||||
|
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ehoff = *off;
|
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*off += sizeof(Elf_Ehdr);
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|
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phoff = *off;
|
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*off += (numsegs + 1) * sizeof(Elf_Phdr);
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||||
|
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noteoff = *off;
|
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elf_putnote(dst, off, "FreeBSD", NT_PRSTATUS, status,
|
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sizeof *status);
|
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elf_putnote(dst, off, "FreeBSD", NT_FPREGSET, fpregset,
|
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sizeof *fpregset);
|
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elf_putnote(dst, off, "FreeBSD", NT_PRPSINFO, psinfo,
|
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sizeof *psinfo);
|
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notesz = *off - noteoff;
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|
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/* Align up to a page boundary for the program segments. */
|
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*off = round_page(*off);
|
||||
|
||||
if (dst != NULL) {
|
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Elf_Ehdr *ehdr;
|
||||
Elf_Phdr *phdr;
|
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struct phdr_closure phc;
|
||||
|
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/*
|
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* Fill in the ELF header.
|
||||
*/
|
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ehdr = (Elf_Ehdr *)((char *)dst + ehoff);
|
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ehdr->e_ident[EI_MAG0] = ELFMAG0;
|
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ehdr->e_ident[EI_MAG1] = ELFMAG1;
|
||||
ehdr->e_ident[EI_MAG2] = ELFMAG2;
|
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ehdr->e_ident[EI_MAG3] = ELFMAG3;
|
||||
ehdr->e_ident[EI_CLASS] = ELF_CLASS;
|
||||
ehdr->e_ident[EI_DATA] = ELF_DATA;
|
||||
ehdr->e_ident[EI_VERSION] = EV_CURRENT;
|
||||
ehdr->e_ident[EI_PAD] = 0;
|
||||
strncpy(ehdr->e_ident + EI_BRAND, "FreeBSD",
|
||||
EI_NIDENT - EI_BRAND);
|
||||
ehdr->e_type = ET_CORE;
|
||||
ehdr->e_machine = ELF_ARCH;
|
||||
ehdr->e_version = EV_CURRENT;
|
||||
ehdr->e_entry = 0;
|
||||
ehdr->e_phoff = phoff;
|
||||
ehdr->e_flags = 0;
|
||||
ehdr->e_ehsize = sizeof(Elf_Ehdr);
|
||||
ehdr->e_phentsize = sizeof(Elf_Phdr);
|
||||
ehdr->e_phnum = numsegs + 1;
|
||||
ehdr->e_shentsize = sizeof(Elf_Shdr);
|
||||
ehdr->e_shnum = 0;
|
||||
ehdr->e_shstrndx = SHN_UNDEF;
|
||||
|
||||
/*
|
||||
* Fill in the program header entries.
|
||||
*/
|
||||
phdr = (Elf_Phdr *)((char *)dst + phoff);
|
||||
|
||||
/* The note segement. */
|
||||
phdr->p_type = PT_NOTE;
|
||||
phdr->p_offset = noteoff;
|
||||
phdr->p_vaddr = 0;
|
||||
phdr->p_paddr = 0;
|
||||
phdr->p_filesz = notesz;
|
||||
phdr->p_memsz = 0;
|
||||
phdr->p_flags = 0;
|
||||
phdr->p_align = 0;
|
||||
phdr++;
|
||||
|
||||
/* All the writable segments from the program. */
|
||||
phc.phdr = phdr;
|
||||
phc.offset = *off;
|
||||
each_writable_segment(map, cb_put_phdr, &phc);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Emit one note section to "dst", or just size it if "dst" is NULL.
|
||||
*/
|
||||
static void
|
||||
elf_putnote(void *dst, size_t *off, const char *name, int type,
|
||||
const void *desc, size_t descsz)
|
||||
{
|
||||
Elf_Note note;
|
||||
|
||||
note.n_namesz = strlen(name) + 1;
|
||||
note.n_descsz = descsz;
|
||||
note.n_type = type;
|
||||
if (dst != NULL)
|
||||
bcopy(¬e, (char *)dst + *off, sizeof note);
|
||||
*off += sizeof note;
|
||||
if (dst != NULL)
|
||||
bcopy(name, (char *)dst + *off, note.n_namesz);
|
||||
*off += roundup2(note.n_namesz, sizeof(Elf_Size));
|
||||
if (dst != NULL)
|
||||
bcopy(desc, (char *)dst + *off, note.n_descsz);
|
||||
*off += roundup2(note.n_descsz, sizeof(Elf_Size));
|
||||
}
|
||||
|
||||
/*
|
||||
* Free the memory map.
|
||||
*/
|
||||
static void
|
||||
freemap(vm_map_entry_t map)
|
||||
{
|
||||
while (map != NULL) {
|
||||
vm_map_entry_t next = map->next;
|
||||
free(map);
|
||||
map = next;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Read the process information necessary to fill in the core file's header.
|
||||
*/
|
||||
static void
|
||||
readhdrinfo(pid_t pid, prstatus_t *status, prfpregset_t *fpregset,
|
||||
prpsinfo_t *psinfo)
|
||||
{
|
||||
char name[64];
|
||||
char line[256];
|
||||
int fd;
|
||||
int i;
|
||||
int n;
|
||||
|
||||
memset(status, 0, sizeof *status);
|
||||
status->pr_version = PRSTATUS_VERSION;
|
||||
status->pr_statussz = sizeof(prstatus_t);
|
||||
status->pr_gregsetsz = sizeof(gregset_t);
|
||||
status->pr_fpregsetsz = sizeof(fpregset_t);
|
||||
status->pr_osreldate = __FreeBSD_version;
|
||||
status->pr_pid = pid;
|
||||
|
||||
memset(fpregset, 0, sizeof *fpregset);
|
||||
|
||||
memset(psinfo, 0, sizeof *psinfo);
|
||||
psinfo->pr_version = PRPSINFO_VERSION;
|
||||
psinfo->pr_psinfosz = sizeof(prpsinfo_t);
|
||||
|
||||
/* Read the general registers. */
|
||||
snprintf(name, sizeof name, "/proc/%d/regs", pid);
|
||||
if ((fd = open(name, O_RDONLY)) == -1)
|
||||
err(1, "cannot open %s", name);
|
||||
if ((n = read(fd, &status->pr_reg, sizeof status->pr_reg)) == -1)
|
||||
err(1, "read error from %s", name);
|
||||
if (n < sizeof status->pr_reg)
|
||||
errx(1, "short read from %s: wanted %u, got %d", name,
|
||||
sizeof status->pr_reg, n);
|
||||
close(fd);
|
||||
|
||||
/* Read the floating point registers. */
|
||||
snprintf(name, sizeof name, "/proc/%d/fpregs", pid);
|
||||
if ((fd = open(name, O_RDONLY)) == -1)
|
||||
err(1, "cannot open %s", name);
|
||||
if ((n = read(fd, fpregset, sizeof *fpregset)) == -1)
|
||||
err(1, "read error from %s", name);
|
||||
if (n < sizeof *fpregset)
|
||||
errx(1, "short read from %s: wanted %u, got %d", name,
|
||||
sizeof *fpregset, n);
|
||||
close(fd);
|
||||
|
||||
/* Read and parse the process status. */
|
||||
snprintf(name, sizeof name, "/proc/%d/status", pid);
|
||||
if ((fd = open(name, O_RDONLY)) == -1)
|
||||
err(1, "cannot open %s", name);
|
||||
if ((n = read(fd, line, sizeof line - 1)) == -1)
|
||||
err(1, "read error from %s", name);
|
||||
if (n > MAXCOMLEN)
|
||||
n = MAXCOMLEN;
|
||||
for (i = 0; i < n && line[i] != ' '; i++)
|
||||
psinfo->pr_fname[i] = line[i];
|
||||
strncpy(psinfo->pr_psargs, psinfo->pr_fname, PRARGSZ);
|
||||
close(fd);
|
||||
}
|
||||
|
||||
/*
|
||||
* Read the process's memory map using procfs, and return a list of
|
||||
* VM map entries. Only the non-device read/writable segments are
|
||||
* returned. The map entries in the list aren't fully filled in; only
|
||||
* the items we need are present.
|
||||
*/
|
||||
static vm_map_entry_t
|
||||
readmap(pid_t pid)
|
||||
{
|
||||
char mapname[64];
|
||||
int mapfd;
|
||||
ssize_t mapsize;
|
||||
size_t bufsize;
|
||||
char *mapbuf;
|
||||
int pos;
|
||||
vm_map_entry_t map;
|
||||
vm_map_entry_t *linkp;
|
||||
|
||||
snprintf(mapname, sizeof mapname, "/proc/%d/map", pid);
|
||||
if ((mapfd = open(mapname, O_RDONLY)) == -1)
|
||||
err(1, "cannot open %s", mapname);
|
||||
|
||||
/*
|
||||
* Procfs requires (for consistency) that the entire memory map
|
||||
* be read with a single read() call. Start with a reasonbly sized
|
||||
* buffer, and double it until it is big enough.
|
||||
*/
|
||||
bufsize = 8 * 1024;
|
||||
mapbuf = NULL;
|
||||
for ( ; ; ) {
|
||||
if ((mapbuf = realloc(mapbuf, bufsize)) == NULL)
|
||||
errx(1, "out of memory");
|
||||
mapsize = read(mapfd, mapbuf, bufsize);
|
||||
if (mapsize != -1 || errno != EFBIG)
|
||||
break;
|
||||
bufsize *= 2;
|
||||
/* This lseek shouldn't be necessary, but it is. */
|
||||
lseek(mapfd, (off_t)0, SEEK_SET);
|
||||
}
|
||||
if (mapsize == -1)
|
||||
err(1, "read error from %s", mapname);
|
||||
if (mapsize == 0)
|
||||
errx(1, "empty map file %s", mapname);
|
||||
close(mapfd);
|
||||
|
||||
pos = 0;
|
||||
map = NULL;
|
||||
linkp = ↦
|
||||
while (pos < mapsize) {
|
||||
vm_map_entry_t ent;
|
||||
vm_offset_t start;
|
||||
vm_offset_t end;
|
||||
char prot[4];
|
||||
char type[16];
|
||||
int n;
|
||||
int len;
|
||||
|
||||
len = 0;
|
||||
n = sscanf(mapbuf + pos, "%x %x %*d %*d %*d %3[-rwx]"
|
||||
" %*d %*d %*x %*s %*s %16s%*[\n]%n",
|
||||
&start, &end, prot, type, &len);
|
||||
if (n != 4)
|
||||
errx(1, "ill-formed line in %s", mapname);
|
||||
pos += len;
|
||||
|
||||
/* Ignore segments of the wrong kind, and unwritable ones */
|
||||
if (strncmp(prot, "rw", 2) != 0 ||
|
||||
(strcmp(type, "default") != 0 &&
|
||||
strcmp(type, "vnode") != 0 &&
|
||||
strcmp(type, "swap") != 0))
|
||||
continue;
|
||||
|
||||
if ((ent = (vm_map_entry_t)calloc(1, sizeof *ent)) == NULL)
|
||||
errx(1, "out of memory");
|
||||
ent->start = start;
|
||||
ent->end = end;
|
||||
ent->protection = VM_PROT_READ | VM_PROT_WRITE;
|
||||
if (prot[2] == 'x')
|
||||
ent->protection |= VM_PROT_EXECUTE;
|
||||
|
||||
*linkp = ent;
|
||||
linkp = &ent->next;
|
||||
}
|
||||
free(mapbuf);
|
||||
return map;
|
||||
}
|
||||
|
|
@ -33,5 +33,9 @@
|
|||
* @(#)extern.h 8.1 (Berkeley) 6/6/93
|
||||
*/
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <kvm.h>
|
||||
|
||||
void err __P((int, const char *, ...));
|
||||
void elf_coredump __P((int, pid_t));
|
||||
void md_core __P((kvm_t *, int, struct kinfo_proc *));
|
||||
|
|
|
|||
|
|
@ -42,7 +42,7 @@ static const char copyright[] =
|
|||
static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
|
||||
#endif
|
||||
static const char rcsid[] =
|
||||
"$Id: gcore.c,v 1.9 1998/09/14 10:09:30 des Exp $";
|
||||
"$Id: gcore.c,v 1.10 1998/10/14 16:16:50 jdp Exp $";
|
||||
#endif /* not lint */
|
||||
|
||||
/*
|
||||
|
|
@ -81,7 +81,7 @@ static const char rcsid[] =
|
|||
|
||||
void core __P((int, int, struct kinfo_proc *));
|
||||
void datadump __P((int, int, struct proc *, u_long, int));
|
||||
void usage __P((void));
|
||||
void usage __P((void)) __dead2;
|
||||
void userdump __P((int, struct proc *, u_long, int));
|
||||
|
||||
kvm_t *kd;
|
||||
|
|
@ -97,11 +97,12 @@ main(argc, argv)
|
|||
char *argv[];
|
||||
{
|
||||
register struct proc *p;
|
||||
struct kinfo_proc *ki;
|
||||
struct kinfo_proc *ki = NULL;
|
||||
struct exec exec;
|
||||
int ch, cnt, efd, fd, pid, sflag, uid;
|
||||
char *binfile, *corefile;
|
||||
char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN + 1];
|
||||
int is_aout;
|
||||
|
||||
sflag = 0;
|
||||
corefile = NULL;
|
||||
|
|
@ -137,27 +138,53 @@ main(argc, argv)
|
|||
usage();
|
||||
}
|
||||
|
||||
kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
|
||||
if (kd == NULL)
|
||||
errx(1, "%s", errbuf);
|
||||
efd = open(binfile, O_RDONLY, 0);
|
||||
if (efd < 0)
|
||||
err(1, "%s", binfile);
|
||||
|
||||
uid = getuid();
|
||||
cnt = read(efd, &exec, sizeof(exec));
|
||||
if (cnt != sizeof(exec))
|
||||
errx(1, "%s exec header: %s",
|
||||
binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
|
||||
if (!N_BADMAG(exec)) {
|
||||
is_aout = 1;
|
||||
/*
|
||||
* This legacy a.out support uses the kvm interface instead
|
||||
* of procfs.
|
||||
*/
|
||||
kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
|
||||
if (kd == NULL)
|
||||
errx(1, "%s", errbuf);
|
||||
|
||||
ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
|
||||
if (ki == NULL || cnt != 1)
|
||||
errx(1, "%d: not found", pid);
|
||||
uid = getuid();
|
||||
|
||||
p = &ki->kp_proc;
|
||||
if (ki->kp_eproc.e_pcred.p_ruid != uid && uid != 0)
|
||||
errx(1, "%d: not owner", pid);
|
||||
ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
|
||||
if (ki == NULL || cnt != 1)
|
||||
errx(1, "%d: not found", pid);
|
||||
|
||||
if (p->p_stat == SZOMB)
|
||||
errx(1, "%d: zombie", pid);
|
||||
p = &ki->kp_proc;
|
||||
if (ki->kp_eproc.e_pcred.p_ruid != uid && uid != 0)
|
||||
errx(1, "%d: not owner", pid);
|
||||
|
||||
if (p->p_flag & P_WEXIT)
|
||||
errx(1, "%d: process exiting", pid);
|
||||
if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */
|
||||
errx(1, "%d: system process", pid);
|
||||
if (p->p_stat == SZOMB)
|
||||
errx(1, "%d: zombie", pid);
|
||||
|
||||
if (p->p_flag & P_WEXIT)
|
||||
errx(1, "%d: process exiting", pid);
|
||||
if (p->p_flag & P_SYSTEM) /* Swapper or pagedaemon. */
|
||||
errx(1, "%d: system process", pid);
|
||||
if (exec.a_text != ptoa(ki->kp_eproc.e_vm.vm_tsize))
|
||||
errx(1, "The executable %s does not belong to"
|
||||
" process %d!\n"
|
||||
"Text segment size (in bytes): executable %d,"
|
||||
" process %d", binfile, pid, exec.a_text,
|
||||
ptoa(ki->kp_eproc.e_vm.vm_tsize));
|
||||
data_offset = N_DATOFF(exec);
|
||||
} else if (IS_ELF(*(Elf_Ehdr *)&exec)) {
|
||||
is_aout = 0;
|
||||
close(efd);
|
||||
} else
|
||||
errx(1, "Invalid executable file");
|
||||
|
||||
if (corefile == NULL) {
|
||||
(void)snprintf(fname, sizeof(fname), "core.%d", pid);
|
||||
|
|
@ -167,36 +194,13 @@ main(argc, argv)
|
|||
if (fd < 0)
|
||||
err(1, "%s", corefile);
|
||||
|
||||
efd = open(binfile, O_RDONLY, 0);
|
||||
if (efd < 0)
|
||||
err(1, "%s", binfile);
|
||||
|
||||
cnt = read(efd, &exec, sizeof(exec));
|
||||
if (cnt != sizeof(exec))
|
||||
errx(1, "%s exec header: %s",
|
||||
binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
|
||||
if (N_BADMAG(exec)) {
|
||||
const Elf_Ehdr *ehdr = (const Elf_Ehdr *)&exec;
|
||||
|
||||
if (IS_ELF(*ehdr))
|
||||
errx(1, "ELF executables are not supported yet");
|
||||
errx(1, "Invalid executable file");
|
||||
}
|
||||
|
||||
/* check the text segment size of the executable and the process */
|
||||
if (exec.a_text != ptoa(ki->kp_eproc.e_vm.vm_tsize))
|
||||
errx(1,
|
||||
"The executable %s does not belong to process %d!\n"
|
||||
"Text segment size (in bytes): executable %d, process %d",
|
||||
binfile, pid, exec.a_text,
|
||||
ptoa(ki->kp_eproc.e_vm.vm_tsize));
|
||||
|
||||
data_offset = N_DATOFF(exec);
|
||||
|
||||
if (sflag && kill(pid, SIGSTOP) < 0)
|
||||
err(1, "%d: stop signal", pid);
|
||||
|
||||
core(efd, fd, ki);
|
||||
if (is_aout)
|
||||
core(efd, fd, ki);
|
||||
else
|
||||
elf_coredump(fd, pid);
|
||||
|
||||
if (sflag && kill(pid, SIGCONT) < 0)
|
||||
err(1, "%d: continue signal", pid);
|
||||
|
|
|
|||
Loading…
Reference in a new issue