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NetBSD/sys/kern/core_elf32.c

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/* $NetBSD: core_elf32.c,v 1.29 2007/02/09 21:55:30 ad Exp $ */
/*
* Copyright (c) 2001 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* core_elf32.c/core_elf64.c: Support for the Elf32/Elf64 core file format.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(1, "$NetBSD: core_elf32.c,v 1.29 2007/02/09 21:55:30 ad Exp $");
/* If not included by core_elf64.c, ELFSIZE won't be defined. */
#ifndef ELFSIZE
#define ELFSIZE 32
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/ptrace.h>
#include <sys/malloc.h>
#include <sys/kauth.h>
#include <machine/reg.h>
#include <uvm/uvm_extern.h>
struct countsegs_state {
int npsections;
};
static int ELFNAMEEND(coredump_countsegs)(struct proc *, void *,
struct uvm_coredump_state *);
struct writesegs_state {
Elf_Phdr *psections;
off_t secoff;
};
static int ELFNAMEEND(coredump_writeseghdrs)(struct proc *, void *,
struct uvm_coredump_state *);
static int ELFNAMEEND(coredump_notes)(struct proc *, struct lwp *, void *,
size_t *);
static int ELFNAMEEND(coredump_note)(struct proc *, struct lwp *, void *,
size_t *);
#define ELFROUNDSIZE 4 /* XXX Should it be sizeof(Elf_Word)? */
#define elfround(x) roundup((x), ELFROUNDSIZE)
#define elf_process_read_regs CONCAT(process_read_regs, ELFSIZE)
#define elf_process_read_fpregs CONCAT(process_read_fpregs, ELFSIZE)
#define elf_reg CONCAT(process_reg, ELFSIZE)
#define elf_fpreg CONCAT(process_fpreg, ELFSIZE)
int
ELFNAMEEND(coredump)(struct lwp *l, void *cookie)
{
struct proc *p;
Elf_Ehdr ehdr;
Elf_Phdr phdr, *psections;
struct countsegs_state cs;
struct writesegs_state ws;
off_t notestart, secstart, offset;
size_t notesize;
int error, i;
psections = NULL;
p = l->l_proc;
/*
* We have to make a total of 3 passes across the map:
*
* 1. Count the number of map entries (the number of
* PT_LOAD sections).
*
* 2. Write the P-section headers.
*
* 3. Write the P-sections.
*/
/* Pass 1: count the entries. */
cs.npsections = 0;
error = uvm_coredump_walkmap(p, NULL,
ELFNAMEEND(coredump_countsegs), &cs);
if (error)
goto out;
/* Count the PT_NOTE section. */
cs.npsections++;
/* Get the size of the notes. */
error = ELFNAMEEND(coredump_notes)(p, l, NULL, &notesize);
if (error)
goto out;
memset(&ehdr.e_ident[EI_PAD], 0, sizeof(ehdr.e_ident) - EI_PAD);
memcpy(ehdr.e_ident, ELFMAG, SELFMAG);
#if ELFSIZE == 32
ehdr.e_ident[EI_CLASS] = ELFCLASS32;
#elif ELFSIZE == 64
ehdr.e_ident[EI_CLASS] = ELFCLASS64;
#endif
ehdr.e_ident[EI_DATA] = ELFDEFNNAME(MACHDEP_ENDIANNESS);
ehdr.e_ident[EI_VERSION] = EV_CURRENT;
/* XXX Should be the OSABI/ABI version of the executable. */
ehdr.e_ident[EI_OSABI] = ELFOSABI_SYSV;
ehdr.e_ident[EI_ABIVERSION] = 0;
ehdr.e_type = ET_CORE;
/* XXX This should be the e_machine of the executable. */
ehdr.e_machine = ELFDEFNNAME(MACHDEP_ID);
ehdr.e_version = EV_CURRENT;
ehdr.e_entry = 0;
ehdr.e_phoff = sizeof(ehdr);
ehdr.e_shoff = 0;
ehdr.e_flags = 0;
ehdr.e_ehsize = sizeof(ehdr);
ehdr.e_phentsize = sizeof(Elf_Phdr);
ehdr.e_phnum = cs.npsections;
ehdr.e_shentsize = 0;
ehdr.e_shnum = 0;
ehdr.e_shstrndx = 0;
/* Write out the ELF header. */
error = coredump_write(cookie, UIO_SYSSPACE, &ehdr, sizeof(ehdr));
if (error)
goto out;
offset = sizeof(ehdr);
notestart = offset + sizeof(phdr) * cs.npsections;
secstart = notestart + notesize;
psections = malloc(cs.npsections * sizeof(Elf_Phdr),
M_TEMP, M_WAITOK|M_ZERO);
/* Pass 2: now write the P-section headers. */
ws.secoff = secstart;
ws.psections = psections;
error = uvm_coredump_walkmap(p, cookie,
ELFNAMEEND(coredump_writeseghdrs), &ws);
if (error)
goto out;
/* Write out the PT_NOTE header. */
ws.psections->p_type = PT_NOTE;
ws.psections->p_offset = notestart;
ws.psections->p_vaddr = 0;
ws.psections->p_paddr = 0;
ws.psections->p_filesz = notesize;
ws.psections->p_memsz = 0;
ws.psections->p_flags = PF_R;
ws.psections->p_align = ELFROUNDSIZE;
error = coredump_write(cookie, UIO_SYSSPACE, psections,
cs.npsections * sizeof(Elf_Phdr));
if (error)
goto out;
#ifdef DIAGNOSTIC
offset += cs.npsections * sizeof(Elf_Phdr);
if (offset != notestart)
panic("coredump: offset %lld != notestart %lld",
(long long) offset, (long long) notestart);
#endif
/* Write out the notes. */
error = ELFNAMEEND(coredump_notes)(p, l, cookie, &notesize);
if (error)
goto out;
#ifdef DIAGNOSTIC
offset += notesize;
if (offset != secstart)
panic("coredump: offset %lld != secstart %lld",
(long long) offset, (long long) secstart);
#endif
/* Pass 3: finally, write the sections themselves. */
for (i = 0; i < cs.npsections - 1; i++) {
if (psections[i].p_filesz == 0)
continue;
#ifdef DIAGNOSTIC
if (offset != psections[i].p_offset)
panic("coredump: offset %lld != p_offset[%d] %lld",
(long long) offset, i,
(long long) psections[i].p_filesz);
#endif
error = coredump_write(cookie, UIO_USERSPACE,
(void *)(vaddr_t)psections[i].p_vaddr,
psections[i].p_filesz);
if (error)
goto out;
#ifdef DIAGNOSTIC
offset += psections[i].p_filesz;
#endif
}
out:
if (psections)
free(psections, M_TEMP);
return (error);
}
static int
ELFNAMEEND(coredump_countsegs)(struct proc *p, void *iocookie,
struct uvm_coredump_state *us)
{
struct countsegs_state *cs = us->cookie;
cs->npsections++;
return (0);
}
static int
ELFNAMEEND(coredump_writeseghdrs)(struct proc *p, void *iocookie,
struct uvm_coredump_state *us)
{
struct writesegs_state *ws = us->cookie;
Elf_Phdr phdr;
vsize_t size, realsize;
vaddr_t end;
int error;
size = us->end - us->start;
realsize = us->realend - us->start;
end = us->realend;
while (realsize > 0) {
long buf[1024 / sizeof(long)];
size_t slen = realsize > sizeof(buf) ? sizeof(buf) : realsize;
const long *ep;
int i;
end -= slen;
if ((error = copyin_proc(p, (void *)end, buf, slen)) != 0)
return error;
ep = (const long *) &buf[slen / sizeof(buf[0])];
for (i = 0, ep--; buf <= ep; ep--, i++) {
if (*ep)
break;
}
realsize -= i * sizeof(buf[0]);
if (i * sizeof(buf[0]) < slen)
break;
}
phdr.p_type = PT_LOAD;
phdr.p_offset = ws->secoff;
phdr.p_vaddr = us->start;
phdr.p_paddr = 0;
phdr.p_filesz = realsize;
phdr.p_memsz = size;
phdr.p_flags = 0;
if (us->prot & VM_PROT_READ)
phdr.p_flags |= PF_R;
if (us->prot & VM_PROT_WRITE)
phdr.p_flags |= PF_W;
if (us->prot & VM_PROT_EXECUTE)
phdr.p_flags |= PF_X;
phdr.p_align = PAGE_SIZE;
ws->secoff += phdr.p_filesz;
*ws->psections++ = phdr;
return (0);
}
static int
ELFNAMEEND(coredump_notes)(struct proc *p, struct lwp *l,
void *iocookie, size_t *sizep)
{
struct netbsd_elfcore_procinfo cpi;
Elf_Nhdr nhdr;
size_t size, notesize;
int error;
struct lwp *l0;
sigset_t ss1, ss2;
size = 0;
/* First, write an elfcore_procinfo. */
notesize = sizeof(nhdr) + elfround(sizeof(ELF_NOTE_NETBSD_CORE_NAME)) +
elfround(sizeof(cpi));
if (iocookie) {
cpi.cpi_version = NETBSD_ELFCORE_PROCINFO_VERSION;
cpi.cpi_cpisize = sizeof(cpi);
cpi.cpi_signo = p->p_sigctx.ps_signo;
cpi.cpi_sigcode = p->p_sigctx.ps_code;
cpi.cpi_siglwp = p->p_sigctx.ps_lwp;
/*
* XXX This should be per-LWP.
*/
ss1 = p->p_sigpend.sp_set;
sigemptyset(&ss2);
LIST_FOREACH(l0, &p->p_lwps, l_sibling) {
sigplusset(&l0->l_sigpend.sp_set, &ss1);
sigplusset(&l0->l_sigmask, &ss2);
}
memcpy(&cpi.cpi_sigpend, &ss1, sizeof(cpi.cpi_sigpend));
memcpy(&cpi.cpi_sigmask, &ss2, sizeof(cpi.cpi_sigmask));
memcpy(&cpi.cpi_sigignore, &p->p_sigctx.ps_sigignore,
sizeof(cpi.cpi_sigignore));
memcpy(&cpi.cpi_sigcatch, &p->p_sigctx.ps_sigcatch,
sizeof(cpi.cpi_sigcatch));
cpi.cpi_pid = p->p_pid;
rw_enter(&proclist_lock, RW_READER);
cpi.cpi_ppid = p->p_pptr->p_pid;
cpi.cpi_pgrp = p->p_pgid;
cpi.cpi_sid = p->p_session->s_sid;
rw_exit(&proclist_lock);
cpi.cpi_ruid = kauth_cred_getuid(l->l_cred);
cpi.cpi_euid = kauth_cred_geteuid(l->l_cred);
cpi.cpi_svuid = kauth_cred_getsvuid(l->l_cred);
cpi.cpi_rgid = kauth_cred_getgid(l->l_cred);
cpi.cpi_egid = kauth_cred_getegid(l->l_cred);
cpi.cpi_svgid = kauth_cred_getsvgid(l->l_cred);
cpi.cpi_nlwps = p->p_nlwps;
(void)strncpy(cpi.cpi_name, p->p_comm, sizeof(cpi.cpi_name));
cpi.cpi_name[sizeof(cpi.cpi_name) - 1] = '\0';
nhdr.n_namesz = sizeof(ELF_NOTE_NETBSD_CORE_NAME);
nhdr.n_descsz = sizeof(cpi);
nhdr.n_type = ELF_NOTE_NETBSD_CORE_PROCINFO;
error = ELFNAMEEND(coredump_writenote)(p, iocookie, &nhdr,
ELF_NOTE_NETBSD_CORE_NAME "\0\0\0", &cpi);
if (error)
return (error);
}
size += notesize;
/* XXX Add hook for machdep per-proc notes. */
/*
* Now write the register info for the thread that caused the
* coredump.
*/
error = ELFNAMEEND(coredump_note)(p, l, iocookie, &notesize);
if (error)
return (error);
size += notesize;
/*
* Now, for each LWP, write the register info and any other
* per-LWP notes. Since we're dumping core, we don't bother
* locking.
*/
LIST_FOREACH(l0, &p->p_lwps, l_sibling) {
if (l0 == l) /* we've taken care of this thread */
continue;
error = ELFNAMEEND(coredump_note)(p, l0, iocookie, &notesize);
if (error)
return (error);
size += notesize;
}
*sizep = size;
return (0);
}
static int
ELFNAMEEND(coredump_note)(struct proc *p, struct lwp *l, void *iocookie,
size_t *sizep)
{
Elf_Nhdr nhdr;
int size, notesize, error;
int namesize;
char name[64+ELFROUNDSIZE];
elf_reg intreg;
#ifdef PT_GETFPREGS
elf_fpreg freg;
#endif
size = 0;
snprintf(name, sizeof(name)-ELFROUNDSIZE, "%s@%d",
ELF_NOTE_NETBSD_CORE_NAME, l->l_lid);
namesize = strlen(name) + 1;
memset(name + namesize, 0, elfround(namesize) - namesize);
notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(intreg));
if (iocookie) {
PHOLD(l);
error = elf_process_read_regs(l, &intreg);
PRELE(l);
if (error)
return (error);
nhdr.n_namesz = namesize;
nhdr.n_descsz = sizeof(intreg);
nhdr.n_type = PT_GETREGS;
error = ELFNAMEEND(coredump_writenote)(p, iocookie, &nhdr,
name, &intreg);
if (error)
return (error);
}
size += notesize;
#ifdef PT_GETFPREGS
notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(freg));
if (iocookie) {
PHOLD(l);
error = elf_process_read_fpregs(l, &freg);
PRELE(l);
if (error)
return (error);
nhdr.n_namesz = namesize;
nhdr.n_descsz = sizeof(freg);
nhdr.n_type = PT_GETFPREGS;
error = ELFNAMEEND(coredump_writenote)(p, iocookie, &nhdr,
name, &freg);
if (error)
return (error);
}
size += notesize;
#endif
*sizep = size;
/* XXX Add hook for machdep per-LWP notes. */
return (0);
}
int
ELFNAMEEND(coredump_writenote)(struct proc *p, void *cookie, Elf_Nhdr *nhdr,
const char *name, void *data)
{
int error;
error = coredump_write(cookie, UIO_SYSSPACE, nhdr, sizeof(*nhdr));
if (error)
return error;
error = coredump_write(cookie, UIO_SYSSPACE, name,
elfround(nhdr->n_namesz));
if (error)
return error;
return coredump_write(cookie, UIO_SYSSPACE, data, nhdr->n_descsz);
}
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