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src/sys/kern/exec_elf.c

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/* $OpenBSD: exec_elf.c,v 1.190 2024/08/21 03:16:25 deraadt Exp $ */
/*
* Copyright (c) 1996 Per Fogelstrom
* All rights reserved.
*
* Copyright (c) 1994 Christos Zoulas
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
*
*/
/*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/core.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/fcntl.h>
#include <sys/ptrace.h>
#include <sys/signalvar.h>
#include <sys/pledge.h>
#include <sys/syscall.h>
#include <sys/mman.h>
#include <uvm/uvm_extern.h>
#include <machine/reg.h>
#include <machine/exec.h>
#include <machine/elf.h>
int elf_load_file(struct proc *, char *, struct exec_package *,
struct elf_args *);
int elf_check_header(Elf_Ehdr *);
int elf_read_from(struct proc *, struct vnode *, u_long, void *, int);
void elf_load_psection(struct exec_vmcmd_set *, struct vnode *,
Elf_Phdr *, Elf_Addr *, Elf_Addr *, int *, int);
int elf_os_pt_note_name(Elf_Note *);
int elf_os_pt_note(struct proc *, struct exec_package *, Elf_Ehdr *, int *);
int elf_read_pintable(struct proc *p, struct vnode *vp, Elf_Phdr *pp,
u_int **pinp, int is_ldso, size_t len);
/* round up and down to page boundaries. */
#define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1))
#define ELF_TRUNC(a, b) ((a) & ~((b) - 1))
/*
* We limit the number of program headers to 32, this should
* be a reasonable limit for ELF, the most we have seen so far is 12
*/
#define ELF_MAX_VALID_PHDR 32
#define ELF_NOTE_NAME_OPENBSD 0x01
struct elf_note_name {
char *name;
int id;
} elf_note_names[] = {
{ "OpenBSD", ELF_NOTE_NAME_OPENBSD },
};
#define ELFROUNDSIZE sizeof(Elf_Word)
#define elfround(x) roundup((x), ELFROUNDSIZE)
/*
* Check header for validity; return 0 for ok, ENOEXEC if error
*/
int
elf_check_header(Elf_Ehdr *ehdr)
{
/*
* We need to check magic, class size, endianness, and version before
* we look at the rest of the Elf_Ehdr structure. These few elements
* are represented in a machine independent fashion.
*/
if (!IS_ELF(*ehdr) ||
ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
ehdr->e_ident[EI_DATA] != ELF_TARG_DATA ||
ehdr->e_ident[EI_VERSION] != ELF_TARG_VER)
return (ENOEXEC);
/* Now check the machine dependent header */
if (ehdr->e_machine != ELF_TARG_MACH ||
ehdr->e_version != ELF_TARG_VER)
return (ENOEXEC);
/* Don't allow an insane amount of sections. */
if (ehdr->e_phnum > ELF_MAX_VALID_PHDR)
return (ENOEXEC);
return (0);
}
/*
* Load a psection at the appropriate address
*/
void
elf_load_psection(struct exec_vmcmd_set *vcset, struct vnode *vp,
Elf_Phdr *ph, Elf_Addr *addr, Elf_Addr *size, int *prot, int flags)
{
u_long msize, lsize, psize, rm, rf;
long diff, offset, bdiff;
Elf_Addr base;
/*
* If the user specified an address, then we load there.
*/
if (*addr != ELF_NO_ADDR) {
if (ph->p_align > 1) {
*addr = ELF_TRUNC(*addr, ph->p_align);
diff = ph->p_vaddr - ELF_TRUNC(ph->p_vaddr, ph->p_align);
/* page align vaddr */
base = *addr + trunc_page(ph->p_vaddr)
- ELF_TRUNC(ph->p_vaddr, ph->p_align);
} else {
diff = 0;
base = *addr + trunc_page(ph->p_vaddr) - ph->p_vaddr;
}
} else {
*addr = ph->p_vaddr;
if (ph->p_align > 1)
*addr = ELF_TRUNC(*addr, ph->p_align);
base = trunc_page(ph->p_vaddr);
diff = ph->p_vaddr - *addr;
}
bdiff = ph->p_vaddr - trunc_page(ph->p_vaddr);
/*
* Enforce W^X and map W|X segments without X permission
* initially. The dynamic linker will make these read-only
* and add back X permission after relocation processing.
* Static executables with W|X segments will probably crash.
*/
*prot |= (ph->p_flags & PF_R) ? PROT_READ : 0;
*prot |= (ph->p_flags & PF_W) ? PROT_WRITE : 0;
if ((ph->p_flags & PF_W) == 0)
*prot |= (ph->p_flags & PF_X) ? PROT_EXEC : 0;
/*
* Apply immutability as much as possible, but not text/rodata
* segments of textrel binaries, or RELRO or PT_OPENBSD_MUTABLE
* sections, or LOADS marked PF_OPENBSD_MUTABLE, or LOADS which
* violate W^X.
* Userland (meaning crt0 or ld.so) will repair those regions.
*/
if ((ph->p_flags & (PF_X | PF_W)) != (PF_X | PF_W) &&
((ph->p_flags & PF_OPENBSD_MUTABLE) == 0))
flags |= VMCMD_IMMUTABLE;
if ((flags & VMCMD_TEXTREL) && (ph->p_flags & PF_W) == 0)
flags &= ~VMCMD_IMMUTABLE;
msize = ph->p_memsz + diff;
offset = ph->p_offset - bdiff;
lsize = ph->p_filesz + bdiff;
psize = round_page(lsize);
/*
* Because the pagedvn pager can't handle zero fill of the last
* data page if it's not page aligned we map the last page readvn.
*/
if (ph->p_flags & PF_W) {
psize = trunc_page(lsize);
if (psize > 0)
NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, base, vp,
offset, *prot, flags);
if (psize != lsize) {
NEW_VMCMD2(vcset, vmcmd_map_readvn, lsize - psize,
base + psize, vp, offset + psize, *prot, flags);
}
} else {
NEW_VMCMD2(vcset, vmcmd_map_pagedvn, psize, base, vp, offset,
*prot, flags);
}
/*
* Check if we need to extend the size of the segment
*/
rm = round_page(*addr + ph->p_memsz + diff);
rf = round_page(*addr + ph->p_filesz + diff);
if (rm != rf) {
NEW_VMCMD2(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 0,
*prot, flags);
}
*size = msize;
}
/*
* Read from vnode into buffer at offset.
*/
int
elf_read_from(struct proc *p, struct vnode *vp, u_long off, void *buf,
int size)
{
int error;
size_t resid;
if ((error = vn_rdwr(UIO_READ, vp, buf, size, off, UIO_SYSSPACE,
0, p->p_ucred, &resid, p)) != 0)
return error;
/*
* See if we got all of it
*/
if (resid != 0)
return (ENOEXEC);
return (0);
}
/*
* rebase the pin offsets inside a base,len window for the text segment only.
*/
void
elf_adjustpins(vaddr_t *basep, size_t *lenp, u_int *pins, int npins, u_int offset)
{
int i;
/* Adjust offsets, base, len */
for (i = 0; i < npins; i++) {
if (pins[i] == -1 || pins[i] == 0)
continue;
pins[i] -= offset;
}
*basep += offset;
*lenp -= offset;
}
int
elf_read_pintable(struct proc *p, struct vnode *vp, Elf_Phdr *pp,
u_int **pinp, int is_ldso, size_t len)
{
struct pinsyscalls {
u_int offset;
u_int sysno;
} *syscalls = NULL;
int i, nsyscalls = 0, npins = 0;
u_int *pins = NULL;
if (pp->p_filesz > SYS_MAXSYSCALL * 2 * sizeof(*syscalls) ||
pp->p_filesz % sizeof(*syscalls) != 0)
goto bad;
nsyscalls = pp->p_filesz / sizeof(*syscalls);
syscalls = malloc(pp->p_filesz, M_PINSYSCALL, M_WAITOK);
if (elf_read_from(p, vp, pp->p_offset, syscalls,
pp->p_filesz) != 0)
goto bad;
/* Validate, and calculate pintable size */
for (i = 0; i < nsyscalls; i++) {
if (syscalls[i].sysno <= 0 ||
syscalls[i].sysno >= SYS_MAXSYSCALL ||
syscalls[i].offset > len)
goto bad;
npins = MAX(npins, syscalls[i].sysno);
}
if (is_ldso)
npins = MAX(npins, SYS_kbind); /* XXX see ld.so/loader.c */
npins++;
/* Fill pintable: 0 = invalid, -1 = allowed, else offset from base */
pins = mallocarray(npins, sizeof(u_int), M_PINSYSCALL, M_WAITOK|M_ZERO);
for (i = 0; i < nsyscalls; i++) {
if (pins[syscalls[i].sysno])
pins[syscalls[i].sysno] = -1; /* duplicated */
else
pins[syscalls[i].sysno] = syscalls[i].offset;
}
if (is_ldso)
pins[SYS_kbind] = -1; /* XXX see ld.so/loader.c */
*pinp = pins;
pins = NULL;
bad:
free(syscalls, M_PINSYSCALL, nsyscalls * sizeof(*syscalls));
free(pins, M_PINSYSCALL, npins * sizeof(u_int));
return npins;
}
/*
* Load a file (interpreter/library) pointed to by path [stolen from
* coff_load_shlib()]. Made slightly generic so it might be used externally.
*/
int
elf_load_file(struct proc *p, char *path, struct exec_package *epp,
struct elf_args *ap)
{
int error, i;
struct nameidata nd;
Elf_Ehdr eh;
Elf_Phdr *ph = NULL, *syscall_ph = NULL;
u_long phsize = 0;
Elf_Addr addr;
struct vnode *vp;
Elf_Phdr *base_ph = NULL;
struct interp_ld_sec {
Elf_Addr vaddr;
u_long memsz;
} loadmap[ELF_MAX_VALID_PHDR];
int nload, idx = 0;
Elf_Addr pos;
int file_align;
int loop;
size_t randomizequota = ELF_RANDOMIZE_LIMIT;
vaddr_t text_start = -1, text_end = 0;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, path, p);
nd.ni_pledge = PLEDGE_RPATH;
nd.ni_unveil = UNVEIL_READ;
if ((error = namei(&nd)) != 0) {
return (error);
}
vp = nd.ni_vp;
if (vp->v_type != VREG) {
error = EACCES;
goto bad;
}
if ((error = VOP_GETATTR(vp, epp->ep_vap, p->p_ucred, p)) != 0)
goto bad;
if (vp->v_mount->mnt_flag & MNT_NOEXEC) {
error = EACCES;
goto bad;
}
if ((error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) != 0)
goto bad1;
if ((error = elf_read_from(p, nd.ni_vp, 0, &eh, sizeof(eh))) != 0)
goto bad1;
if (elf_check_header(&eh) || eh.e_type != ET_DYN) {
error = ENOEXEC;
goto bad1;
}
ph = mallocarray(eh.e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK);
phsize = eh.e_phnum * sizeof(Elf_Phdr);
if ((error = elf_read_from(p, nd.ni_vp, eh.e_phoff, ph, phsize)) != 0)
goto bad1;
for (i = 0; i < eh.e_phnum; i++) {
if ((ph[i].p_align > 1) && !powerof2(ph[i].p_align)) {
error = EINVAL;
goto bad1;
}
if (ph[i].p_type == PT_LOAD) {
if (ph[i].p_filesz > ph[i].p_memsz ||
ph[i].p_memsz == 0) {
error = EINVAL;
goto bad1;
}
loadmap[idx].vaddr = trunc_page(ph[i].p_vaddr);
loadmap[idx].memsz = round_page (ph[i].p_vaddr +
ph[i].p_memsz - loadmap[idx].vaddr);
file_align = ph[i].p_align;
idx++;
}
}
nload = idx;
/*
* Load the interpreter where a non-fixed mmap(NULL, ...)
* would (i.e. something safely out of the way).
*/
pos = uvm_map_hint(p->p_vmspace, PROT_EXEC, VM_MIN_ADDRESS,
VM_MAXUSER_ADDRESS);
pos = ELF_ROUND(pos, file_align);
loop = 0;
for (i = 0; i < nload;/**/) {
vaddr_t addr;
struct uvm_object *uobj;
off_t uoff;
size_t size;
#ifdef this_needs_fixing
if (i == 0) {
uobj = &vp->v_uvm.u_obj;
/* need to fix uoff */
} else {
#endif
uobj = NULL;
uoff = 0;
#ifdef this_needs_fixing
}
#endif
addr = trunc_page(pos + loadmap[i].vaddr);
size = round_page(addr + loadmap[i].memsz) - addr;
/* CRAP - map_findspace does not avoid daddr+BRKSIZ */
if ((addr + size > (vaddr_t)p->p_vmspace->vm_daddr) &&
(addr < (vaddr_t)p->p_vmspace->vm_daddr + BRKSIZ))
addr = round_page((vaddr_t)p->p_vmspace->vm_daddr +
BRKSIZ);
if (uvm_map_mquery(&p->p_vmspace->vm_map, &addr, size,
(i == 0 ? uoff : UVM_UNKNOWN_OFFSET), 0) != 0) {
if (loop == 0) {
loop = 1;
i = 0;
pos = 0;
continue;
}
error = ENOMEM;
goto bad1;
}
if (addr != pos + loadmap[i].vaddr) {
/* base changed. */
pos = addr - trunc_page(loadmap[i].vaddr);
pos = ELF_ROUND(pos,file_align);
i = 0;
continue;
}
i++;
}
/*
* Load all the necessary sections
*/
for (i = 0; i < eh.e_phnum; i++) {
Elf_Addr size = 0;
int prot = 0;
int flags;
switch (ph[i].p_type) {
case PT_LOAD:
if (base_ph == NULL) {
flags = VMCMD_BASE;
addr = pos;
base_ph = &ph[i];
} else {
flags = VMCMD_RELATIVE;
addr = ph[i].p_vaddr - base_ph->p_vaddr;
}
elf_load_psection(&epp->ep_vmcmds, nd.ni_vp,
&ph[i], &addr, &size, &prot, flags);
/* If entry is within this section it must be text */
if (eh.e_entry >= ph[i].p_vaddr &&
eh.e_entry < (ph[i].p_vaddr + size)) {
/* LOAD containing e_entry may not be writable */
if (prot & PROT_WRITE) {
error = ENOEXEC;
goto bad1;
}
epp->ep_entry = addr + eh.e_entry -
ELF_TRUNC(ph[i].p_vaddr,ph[i].p_align);
if (flags == VMCMD_RELATIVE)
epp->ep_entry += pos;
ap->arg_interp = pos;
}
if (prot & PROT_EXEC) {
if (addr < text_start)
text_start = addr;
if (addr+size >= text_end)
text_end = addr + size;
}
addr += size;
break;
case PT_PHDR:
case PT_NOTE:
break;
case PT_OPENBSD_RANDOMIZE:
if (ph[i].p_memsz > randomizequota) {
error = ENOMEM;
goto bad1;
}
randomizequota -= ph[i].p_memsz;
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_randomize,
ph[i].p_memsz, ph[i].p_vaddr + pos, NULLVP, 0, 0);
break;
case PT_DYNAMIC:
#if defined (__mips__)
/* DT_DEBUG is not ready on mips */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_mutable,
ph[i].p_memsz, ph[i].p_vaddr + pos, NULLVP, 0, 0);
#endif
break;
case PT_GNU_RELRO:
case PT_OPENBSD_MUTABLE:
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_mutable,
ph[i].p_memsz, ph[i].p_vaddr + pos, NULLVP, 0, 0);
break;
case PT_OPENBSD_SYSCALLS:
syscall_ph = &ph[i];
break;
default:
break;
}
}
if (syscall_ph) {
struct process *pr = p->p_p;
vaddr_t base = pos;
size_t len = text_end;
u_int *pins;
int npins;
npins = elf_read_pintable(p, nd.ni_vp, syscall_ph,
&pins, 1, len);
if (npins) {
elf_adjustpins(&base, &len, pins, npins,
text_start);
pr->ps_pin.pn_start = base;
pr->ps_pin.pn_end = base + len;
pr->ps_pin.pn_pins = pins;
pr->ps_pin.pn_npins = npins;
}
} else {
error = EINVAL; /* no pin table */
goto bad1;
}
vn_marktext(nd.ni_vp);
bad1:
VOP_CLOSE(nd.ni_vp, FREAD, p->p_ucred, p);
bad:
free(ph, M_TEMP, phsize);
vput(nd.ni_vp);
return (error);
}
/*
* Prepare an Elf binary's exec package
*
* First, set of the various offsets/lengths in the exec package.
*
* Then, mark the text image busy (so it can be demand paged) or error out if
* this is not possible. Finally, set up vmcmds for the text, data, bss, and
* stack segments.
*/
int
exec_elf_makecmds(struct proc *p, struct exec_package *epp)
{
Elf_Ehdr *eh = epp->ep_hdr;
Elf_Phdr *ph, *pp, *base_ph = NULL, *syscall_ph = NULL;
Elf_Addr phdr = 0, exe_base = 0, exe_end = 0;
int error, i, has_phdr = 0, names = 0, textrel = 0;
char *interp = NULL;
u_long phsize;
size_t randomizequota = ELF_RANDOMIZE_LIMIT;
if (epp->ep_hdrvalid < sizeof(Elf_Ehdr))
return (ENOEXEC);
if (elf_check_header(eh) ||
(eh->e_type != ET_EXEC && eh->e_type != ET_DYN))
return (ENOEXEC);
/*
* check if vnode is in open for writing, because we want to demand-
* page out of it. if it is, don't do it, for various reasons.
*/
if (epp->ep_vp->v_writecount != 0) {
#ifdef DIAGNOSTIC
if (epp->ep_vp->v_flag & VTEXT)
panic("exec: a VTEXT vnode has writecount != 0");
#endif
return (ETXTBSY);
}
/*
* Allocate space to hold all the program headers, and read them
* from the file
*/
ph = mallocarray(eh->e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK);
phsize = eh->e_phnum * sizeof(Elf_Phdr);
if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff, ph,
phsize)) != 0)
goto bad;
epp->ep_tsize = ELF_NO_ADDR;
epp->ep_dsize = ELF_NO_ADDR;
for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) {
if ((pp->p_align > 1) && !powerof2(pp->p_align)) {
error = EINVAL;
goto bad;
}
if (pp->p_type == PT_INTERP && !interp) {
if (pp->p_filesz < 2 || pp->p_filesz > MAXPATHLEN)
goto bad;
interp = pool_get(&namei_pool, PR_WAITOK);
if ((error = elf_read_from(p, epp->ep_vp,
pp->p_offset, interp, pp->p_filesz)) != 0) {
goto bad;
}
if (interp[pp->p_filesz - 1] != '\0')
goto bad;
} else if (pp->p_type == PT_LOAD) {
if (pp->p_filesz > pp->p_memsz ||
pp->p_memsz == 0) {
error = EINVAL;
goto bad;
}
if (base_ph == NULL)
base_ph = pp;
} else if (pp->p_type == PT_PHDR) {
has_phdr = 1;
}
}
/*
* Verify this is an OpenBSD executable. If it's marked that way
* via a PT_NOTE then also check for a PT_OPENBSD_WXNEEDED segment.
*/
if ((error = elf_os_pt_note(p, epp, epp->ep_hdr, &names)) != 0)
goto bad;
if (eh->e_ident[EI_OSABI] == ELFOSABI_OPENBSD)
names |= ELF_NOTE_NAME_OPENBSD;
if (eh->e_type == ET_DYN) {
/* need phdr and load sections for PIE */
if (!has_phdr || base_ph == NULL || base_ph->p_vaddr != 0) {
error = EINVAL;
goto bad;
}
/* randomize exe_base for PIE */
exe_base = uvm_map_pie(base_ph->p_align);
/*
* Check if DYNAMIC contains DT_TEXTREL
*/
for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) {
Elf_Dyn *dt;
int j;
switch (pp->p_type) {
case PT_DYNAMIC:
if (pp->p_filesz > 64*1024)
break;
dt = malloc(pp->p_filesz, M_TEMP, M_WAITOK);
error = vn_rdwr(UIO_READ, epp->ep_vp,
(caddr_t)dt, pp->p_filesz, pp->p_offset,
UIO_SYSSPACE, IO_UNIT, p->p_ucred, NULL, p);
if (error) {
free(dt, M_TEMP, pp->p_filesz);
break;
}
for (j = 0; j < pp->p_filesz / sizeof(*dt); j++) {
if (dt[j].d_tag == DT_TEXTREL) {
textrel = VMCMD_TEXTREL;
break;
}
}
free(dt, M_TEMP, pp->p_filesz);
break;
default:
break;
}
}
}
/*
* Load all the necessary sections
*/
for (i = 0, pp = ph; i < eh->e_phnum; i++, pp++) {
Elf_Addr addr, size = 0;
int prot = 0;
int flags = 0;
switch (pp->p_type) {
case PT_LOAD:
if (exe_base != 0) {
if (pp == base_ph) {
flags = VMCMD_BASE;
addr = exe_base;
} else {
flags = VMCMD_RELATIVE;
addr = pp->p_vaddr - base_ph->p_vaddr;
}
} else
addr = ELF_NO_ADDR;
/* Static binaries may not call pinsyscalls() */
if (interp == NULL)
p->p_vmspace->vm_map.flags |= VM_MAP_PINSYSCALL_ONCE;
/*
* Calculates size of text and data segments
* by starting at first and going to end of last.
* 'rwx' sections are treated as data.
* this is correct for BSS_PLT, but may not be
* for DATA_PLT, is fine for TEXT_PLT.
*/
elf_load_psection(&epp->ep_vmcmds, epp->ep_vp,
pp, &addr, &size, &prot, flags | textrel);
/*
* Update exe_base in case alignment was off.
* For PIE, addr is relative to exe_base so
* adjust it (non PIE exe_base is 0 so no change).
*/
if (flags == VMCMD_BASE)
exe_base = addr;
else
addr += exe_base;
/*
* Decide whether it's text or data by looking
* at the protection of the section
*/
if (prot & PROT_WRITE) {
/* data section */
if (epp->ep_dsize == ELF_NO_ADDR) {
epp->ep_daddr = addr;
epp->ep_dsize = size;
} else {
if (addr < epp->ep_daddr) {
epp->ep_dsize =
epp->ep_dsize +
epp->ep_daddr -
addr;
epp->ep_daddr = addr;
} else
epp->ep_dsize = addr+size -
epp->ep_daddr;
}
} else if (prot & PROT_EXEC) {
/* text section */
if (epp->ep_tsize == ELF_NO_ADDR) {
epp->ep_taddr = addr;
epp->ep_tsize = size;
} else {
if (addr < epp->ep_taddr) {
epp->ep_tsize =
epp->ep_tsize +
epp->ep_taddr -
addr;
epp->ep_taddr = addr;
} else
epp->ep_tsize = addr+size -
epp->ep_taddr;
}
if (interp == NULL)
exe_end = epp->ep_taddr +
epp->ep_tsize; /* end of TEXT */
}
break;
case PT_SHLIB:
error = ENOEXEC;
goto bad;
case PT_INTERP:
/* Already did this one */
case PT_NOTE:
break;
case PT_PHDR:
/* Note address of program headers (in text segment) */
phdr = pp->p_vaddr;
break;
case PT_OPENBSD_RANDOMIZE:
if (ph[i].p_memsz > randomizequota) {
error = ENOMEM;
goto bad;
}
randomizequota -= ph[i].p_memsz;
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_randomize,
ph[i].p_memsz, ph[i].p_vaddr + exe_base, NULLVP, 0, 0);
break;
case PT_DYNAMIC:
#if defined (__mips__)
/* DT_DEBUG is not ready on mips */
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_mutable,
ph[i].p_memsz, ph[i].p_vaddr + exe_base, NULLVP, 0, 0);
#endif
break;
case PT_GNU_RELRO:
case PT_OPENBSD_MUTABLE:
NEW_VMCMD(&epp->ep_vmcmds, vmcmd_mutable,
ph[i].p_memsz, ph[i].p_vaddr + exe_base, NULLVP, 0, 0);
break;
case PT_OPENBSD_SYSCALLS:
if (interp == NULL)
syscall_ph = &ph[i];
break;
default:
/*
* Not fatal, we don't need to understand everything
* :-)
*/
break;
}
}
if (syscall_ph) {
vaddr_t base = exe_base;
size_t len = exe_end - exe_base;
u_int *pins;
int npins;
npins = elf_read_pintable(p, epp->ep_vp, syscall_ph,
&pins, 0, len);
if (npins) {
elf_adjustpins(&base, &len, pins, npins,
epp->ep_taddr - exe_base);
epp->ep_pinstart = base;
epp->ep_pinend = base + len;
epp->ep_pins = pins;
epp->ep_npins = npins;
}
}
phdr += exe_base;
/*
* Strangely some linux programs may have all load sections marked
* writeable, in this case, textsize is not -1, but rather 0;
*/
if (epp->ep_tsize == ELF_NO_ADDR)
epp->ep_tsize = 0;
/*
* Another possibility is that it has all load sections marked
* read-only. Fake a zero-sized data segment right after the
* text segment.
*/
if (epp->ep_dsize == ELF_NO_ADDR) {
epp->ep_daddr = round_page(epp->ep_taddr + epp->ep_tsize);
epp->ep_dsize = 0;
}
epp->ep_interp = interp;
epp->ep_entry = eh->e_entry + exe_base;
/*
* Check if we found a dynamically linked binary and arrange to load
* its interpreter when the exec file is released.
*/
if (interp || eh->e_type == ET_DYN) {
struct elf_args *ap;
ap = malloc(sizeof(*ap), M_TEMP, M_WAITOK);
ap->arg_phaddr = phdr;
ap->arg_phentsize = eh->e_phentsize;
ap->arg_phnum = eh->e_phnum;
ap->arg_entry = eh->e_entry + exe_base;
ap->arg_interp = exe_base;
epp->ep_args = ap;
}
free(ph, M_TEMP, phsize);
vn_marktext(epp->ep_vp);
return (exec_setup_stack(p, epp));
bad:
if (interp)
pool_put(&namei_pool, interp);
free(ph, M_TEMP, phsize);
kill_vmcmds(&epp->ep_vmcmds);
if (error == 0)
return (ENOEXEC);
return (error);
}
#ifdef __HAVE_CPU_HWCAP
unsigned long hwcap;
#endif /* __HAVE_CPU_HWCAP */
#ifdef __HAVE_CPU_HWCAP2
unsigned long hwcap2;
#endif /* __HAVE_CPU_HWCAP2 */
/*
* Phase II of load. It is now safe to load the interpreter. Info collected
* when loading the program is available for setup of the interpreter.
*/
int
exec_elf_fixup(struct proc *p, struct exec_package *epp)
{
char *interp;
int error = 0;
struct elf_args *ap;
AuxInfo ai[ELF_AUX_ENTRIES], *a;
ap = epp->ep_args;
if (ap == NULL) {
return (0);
}
interp = epp->ep_interp;
/* disable kbind in programs that don't use ld.so */
if (interp == NULL)
p->p_p->ps_kbind_addr = BOGO_PC;
if (interp &&
(error = elf_load_file(p, interp, epp, ap)) != 0) {
uprintf("execve: cannot load %s\n", interp);
free(ap, M_TEMP, sizeof *ap);
pool_put(&namei_pool, interp);
kill_vmcmds(&epp->ep_vmcmds);
return (error);
}
/*
* We have to do this ourselves...
*/
error = exec_process_vmcmds(p, epp);
/*
* Push extra arguments on the stack needed by dynamically
* linked binaries
*/
if (error == 0) {
memset(&ai, 0, sizeof ai);
a = ai;
a->au_id = AUX_phdr;
a->au_v = ap->arg_phaddr;
a++;
a->au_id = AUX_phent;
a->au_v = ap->arg_phentsize;
a++;
a->au_id = AUX_phnum;
a->au_v = ap->arg_phnum;
a++;
a->au_id = AUX_pagesz;
a->au_v = PAGE_SIZE;
a++;
a->au_id = AUX_base;
a->au_v = ap->arg_interp;
a++;
a->au_id = AUX_flags;
a->au_v = 0;
a++;
a->au_id = AUX_entry;
a->au_v = ap->arg_entry;
a++;
#ifdef __HAVE_CPU_HWCAP
a->au_id = AUX_hwcap;
a->au_v = hwcap;
a++;
#endif /* __HAVE_CPU_HWCAP */
#ifdef __HAVE_CPU_HWCAP2
a->au_id = AUX_hwcap2;
a->au_v = hwcap2;
a++;
#endif /* __HAVE_CPU_HWCAP2 */
a->au_id = AUX_openbsd_timekeep;
a->au_v = p->p_p->ps_timekeep;
a++;
a->au_id = AUX_null;
a->au_v = 0;
a++;
error = copyout(ai, epp->ep_auxinfo, sizeof ai);
}
free(ap, M_TEMP, sizeof *ap);
if (interp)
pool_put(&namei_pool, interp);
return (error);
}
int
elf_os_pt_note_name(Elf_Note *np)
{
int i, j;
for (i = 0; i < nitems(elf_note_names); i++) {
size_t namlen = strlen(elf_note_names[i].name);
if (np->namesz < namlen)
continue;
/* verify name padding (after the NUL) is NUL */
for (j = namlen + 1; j < elfround(np->namesz); j++)
if (((char *)(np + 1))[j] != '\0')
continue;
/* verify desc padding is NUL */
for (j = np->descsz; j < elfround(np->descsz); j++)
if (((char *)(np + 1))[j] != '\0')
continue;
if (strcmp((char *)(np + 1), elf_note_names[i].name) == 0)
return elf_note_names[i].id;
}
return (0);
}
int
elf_os_pt_note(struct proc *p, struct exec_package *epp, Elf_Ehdr *eh, int *namesp)
{
Elf_Phdr *hph, *ph;
Elf_Note *np = NULL;
size_t phsize, offset, pfilesz = 0, total;
int error, names = 0;
hph = mallocarray(eh->e_phnum, sizeof(Elf_Phdr), M_TEMP, M_WAITOK);
phsize = eh->e_phnum * sizeof(Elf_Phdr);
if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff,
hph, phsize)) != 0)
goto out1;
for (ph = hph; ph < &hph[eh->e_phnum]; ph++) {
if (ph->p_type == PT_OPENBSD_WXNEEDED) {
epp->ep_flags |= EXEC_WXNEEDED;
continue;
}
if (ph->p_type == PT_OPENBSD_NOBTCFI) {
epp->ep_flags |= EXEC_NOBTCFI;
continue;
}
if (ph->p_type != PT_NOTE || ph->p_filesz > 1024)
continue;
if (np && ph->p_filesz != pfilesz) {
free(np, M_TEMP, pfilesz);
np = NULL;
}
if (!np)
np = malloc(ph->p_filesz, M_TEMP, M_WAITOK);
pfilesz = ph->p_filesz;
if ((error = elf_read_from(p, epp->ep_vp, ph->p_offset,
np, ph->p_filesz)) != 0)
goto out2;
for (offset = 0; offset < ph->p_filesz; offset += total) {
Elf_Note *np2 = (Elf_Note *)((char *)np + offset);
if (offset + sizeof(Elf_Note) > ph->p_filesz)
break;
total = sizeof(Elf_Note) + elfround(np2->namesz) +
elfround(np2->descsz);
if (offset + total > ph->p_filesz)
break;
names |= elf_os_pt_note_name(np2);
}
}
out2:
free(np, M_TEMP, pfilesz);
out1:
free(hph, M_TEMP, phsize);
*namesp = names;
return ((names & ELF_NOTE_NAME_OPENBSD) ? 0 : ENOEXEC);
}
/*
* Start of routines related to dumping core
*/
#ifdef SMALL_KERNEL
int
coredump_elf(struct proc *p, void *cookie)
{
return EPERM;
}
#else /* !SMALL_KERNEL */
struct writesegs_state {
off_t notestart;
off_t secstart;
off_t secoff;
struct proc *p;
void *iocookie;
Elf_Phdr *psections;
size_t psectionslen;
size_t notesize;
int npsections;
};
uvm_coredump_setup_cb coredump_setup_elf;
uvm_coredump_walk_cb coredump_walk_elf;
int coredump_notes_elf(struct proc *, void *, size_t *);
int coredump_note_elf(struct proc *, void *, size_t *);
int coredump_writenote_elf(struct proc *, void *, Elf_Note *,
const char *, void *);
extern vaddr_t sigcode_va;
extern vsize_t sigcode_sz;
int
coredump_elf(struct proc *p, void *cookie)
{
#ifdef DIAGNOSTIC
off_t offset;
#endif
struct writesegs_state ws;
size_t notesize;
int error, i;
ws.p = p;
ws.iocookie = cookie;
ws.psections = NULL;
/*
* Walk the map to get all the segment offsets and lengths,
* write out the ELF header.
*/
error = uvm_coredump_walkmap(p, coredump_setup_elf,
coredump_walk_elf, &ws);
if (error)
goto out;
error = coredump_write(cookie, UIO_SYSSPACE, ws.psections,
ws.psectionslen, 0);
if (error)
goto out;
/* Write out the notes. */
error = coredump_notes_elf(p, cookie, &notesize);
if (error)
goto out;
#ifdef DIAGNOSTIC
if (notesize != ws.notesize)
panic("coredump: notesize changed: %zu != %zu",
ws.notesize, notesize);
offset = ws.notestart + notesize;
if (offset != ws.secstart)
panic("coredump: offset %lld != secstart %lld",
(long long) offset, (long long) ws.secstart);
#endif
/* Pass 3: finally, write the sections themselves. */
for (i = 0; i < ws.npsections - 1; i++) {
Elf_Phdr *pent = &ws.psections[i];
if (pent->p_filesz == 0)
continue;
#ifdef DIAGNOSTIC
if (offset != pent->p_offset)
panic("coredump: offset %lld != p_offset[%d] %lld",
(long long) offset, i,
(long long) pent->p_filesz);
#endif
/*
* Since the sigcode is mapped execute-only, we can't
* read it. So use the kernel mapping for it instead.
*/
if (pent->p_vaddr == p->p_p->ps_sigcode &&
pent->p_filesz == sigcode_sz) {
error = coredump_write(cookie, UIO_SYSSPACE,
(void *)sigcode_va, sigcode_sz, 0);
} else {
error = coredump_write(cookie, UIO_USERSPACE,
(void *)(vaddr_t)pent->p_vaddr, pent->p_filesz,
(pent->p_flags & PF_ISVNODE));
}
if (error)
goto out;
coredump_unmap(cookie, (vaddr_t)pent->p_vaddr,
(vaddr_t)pent->p_vaddr + pent->p_filesz);
#ifdef DIAGNOSTIC
offset += ws.psections[i].p_filesz;
#endif
}
out:
free(ws.psections, M_TEMP, ws.psectionslen);
return (error);
}
/*
* Normally we lay out core files like this:
* [ELF Header] [Program headers] [Notes] [data for PT_LOAD segments]
*
* However, if there's >= 65535 segments then it overflows the field
* in the ELF header, so the standard specifies putting a magic
* number there and saving the real count in the .sh_info field of
* the first *section* header...which requires generating a section
* header. To avoid confusing tools, we include an .shstrtab section
* as well so all the indexes look valid. So in this case we lay
* out the core file like this:
* [ELF Header] [Section Headers] [.shstrtab] [Program headers] \
* [Notes] [data for PT_LOAD segments]
*
* The 'shstrtab' structure below is data for the second of the two
* section headers, plus the .shstrtab itself, in one const buffer.
*/
static const struct {
Elf_Shdr shdr;
char shstrtab[sizeof(ELF_SHSTRTAB) + 1];
} shstrtab = {
.shdr = {
.sh_name = 1, /* offset in .shstrtab below */
.sh_type = SHT_STRTAB,
.sh_offset = sizeof(Elf_Ehdr) + 2*sizeof(Elf_Shdr),
.sh_size = sizeof(ELF_SHSTRTAB) + 1,
.sh_addralign = 1,
},
.shstrtab = "\0" ELF_SHSTRTAB,
};
int
coredump_setup_elf(int segment_count, void *cookie)
{
Elf_Ehdr ehdr;
struct writesegs_state *ws = cookie;
Elf_Phdr *note;
int error;
/* Get the count of segments, plus one for the PT_NOTE */
ws->npsections = segment_count + 1;
/* Get the size of the notes. */
error = coredump_notes_elf(ws->p, NULL, &ws->notesize);
if (error)
return error;
/* Setup the ELF header */
memset(&ehdr, 0, sizeof(ehdr));
memcpy(ehdr.e_ident, ELFMAG, SELFMAG);
ehdr.e_ident[EI_CLASS] = ELF_TARG_CLASS;
ehdr.e_ident[EI_DATA] = ELF_TARG_DATA;
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 = ELF_TARG_MACH;
ehdr.e_version = EV_CURRENT;
ehdr.e_entry = 0;
ehdr.e_flags = 0;
ehdr.e_ehsize = sizeof(ehdr);
ehdr.e_phentsize = sizeof(Elf_Phdr);
if (ws->npsections < PN_XNUM) {
ehdr.e_phoff = sizeof(ehdr);
ehdr.e_shoff = 0;
ehdr.e_phnum = ws->npsections;
ehdr.e_shentsize = 0;
ehdr.e_shnum = 0;
ehdr.e_shstrndx = 0;
} else {
/* too many segments, use extension setup */
ehdr.e_shoff = sizeof(ehdr);
ehdr.e_phnum = PN_XNUM;
ehdr.e_shentsize = sizeof(Elf_Shdr);
ehdr.e_shnum = 2;
ehdr.e_shstrndx = 1;
ehdr.e_phoff = shstrtab.shdr.sh_offset + shstrtab.shdr.sh_size;
}
/* Write out the ELF header. */
error = coredump_write(ws->iocookie, UIO_SYSSPACE, &ehdr, sizeof(ehdr), 0);
if (error)
return error;
/*
* If an section header is needed to store extension info, write
* it out after the ELF header and before the program header.
*/
if (ehdr.e_shnum != 0) {
Elf_Shdr shdr = { .sh_info = ws->npsections };
error = coredump_write(ws->iocookie, UIO_SYSSPACE, &shdr,
sizeof shdr, 0);
if (error)
return error;
error = coredump_write(ws->iocookie, UIO_SYSSPACE, &shstrtab,
sizeof(shstrtab.shdr) + sizeof(shstrtab.shstrtab), 0);
if (error)
return error;
}
/*
* Allocate the segment header array and setup to collect
* the section sizes and offsets
*/
ws->psections = mallocarray(ws->npsections, sizeof(Elf_Phdr),
M_TEMP, M_WAITOK|M_CANFAIL|M_ZERO);
if (ws->psections == NULL)
return ENOMEM;
ws->psectionslen = ws->npsections * sizeof(Elf_Phdr);
ws->notestart = ehdr.e_phoff + ws->psectionslen;
ws->secstart = ws->notestart + ws->notesize;
ws->secoff = ws->secstart;
/* Fill in the PT_NOTE segment header in the last slot */
note = &ws->psections[ws->npsections - 1];
note->p_type = PT_NOTE;
note->p_offset = ws->notestart;
note->p_vaddr = 0;
note->p_paddr = 0;
note->p_filesz = ws->notesize;
note->p_memsz = 0;
note->p_flags = PF_R;
note->p_align = ELFROUNDSIZE;
return (0);
}
int
coredump_walk_elf(vaddr_t start, vaddr_t realend, vaddr_t end, vm_prot_t prot,
int isvnode, int nsegment, void *cookie)
{
struct writesegs_state *ws = cookie;
Elf_Phdr phdr;
vsize_t size, realsize;
size = end - start;
realsize = realend - start;
phdr.p_type = PT_LOAD;
phdr.p_offset = ws->secoff;
phdr.p_vaddr = start;
phdr.p_paddr = 0;
phdr.p_filesz = realsize;
phdr.p_memsz = size;
phdr.p_flags = 0;
if (prot & PROT_READ)
phdr.p_flags |= PF_R;
if (prot & PROT_WRITE)
phdr.p_flags |= PF_W;
if (prot & PROT_EXEC)
phdr.p_flags |= PF_X;
if (isvnode)
phdr.p_flags |= PF_ISVNODE;
phdr.p_align = PAGE_SIZE;
ws->secoff += phdr.p_filesz;
ws->psections[nsegment] = phdr;
return (0);
}
int
coredump_notes_elf(struct proc *p, void *iocookie, size_t *sizep)
{
struct elfcore_procinfo cpi;
Elf_Note nhdr;
struct process *pr = p->p_p;
struct proc *q;
size_t size, notesize;
int error;
KASSERT(!P_HASSIBLING(p) || pr->ps_single != NULL);
size = 0;
/* First, write an elfcore_procinfo. */
notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) +
elfround(sizeof(cpi));
if (iocookie) {
memset(&cpi, 0, sizeof(cpi));
cpi.cpi_version = ELFCORE_PROCINFO_VERSION;
cpi.cpi_cpisize = sizeof(cpi);
cpi.cpi_signo = p->p_sisig;
cpi.cpi_sigcode = p->p_sicode;
cpi.cpi_sigpend = p->p_siglist | pr->ps_siglist;
cpi.cpi_sigmask = p->p_sigmask;
cpi.cpi_sigignore = pr->ps_sigacts->ps_sigignore;
cpi.cpi_sigcatch = pr->ps_sigacts->ps_sigcatch;
cpi.cpi_pid = pr->ps_pid;
cpi.cpi_ppid = pr->ps_ppid;
cpi.cpi_pgrp = pr->ps_pgid;
if (pr->ps_session->s_leader)
cpi.cpi_sid = pr->ps_session->s_leader->ps_pid;
else
cpi.cpi_sid = 0;
cpi.cpi_ruid = p->p_ucred->cr_ruid;
cpi.cpi_euid = p->p_ucred->cr_uid;
cpi.cpi_svuid = p->p_ucred->cr_svuid;
cpi.cpi_rgid = p->p_ucred->cr_rgid;
cpi.cpi_egid = p->p_ucred->cr_gid;
cpi.cpi_svgid = p->p_ucred->cr_svgid;
(void)strlcpy(cpi.cpi_name, pr->ps_comm, sizeof(cpi.cpi_name));
nhdr.namesz = sizeof("OpenBSD");
nhdr.descsz = sizeof(cpi);
nhdr.type = NT_OPENBSD_PROCINFO;
error = coredump_writenote_elf(p, iocookie, &nhdr,
"OpenBSD", &cpi);
if (error)
return (error);
}
size += notesize;
/* Second, write an NT_OPENBSD_AUXV note. */
notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) +
elfround(ELF_AUX_WORDS * sizeof(char *));
if (iocookie && pr->ps_auxinfo) {
nhdr.namesz = sizeof("OpenBSD");
nhdr.descsz = ELF_AUX_WORDS * sizeof(char *);
nhdr.type = NT_OPENBSD_AUXV;
error = coredump_write(iocookie, UIO_SYSSPACE,
&nhdr, sizeof(nhdr), 0);
if (error)
return (error);
error = coredump_write(iocookie, UIO_SYSSPACE,
"OpenBSD", elfround(nhdr.namesz), 0);
if (error)
return (error);
error = coredump_write(iocookie, UIO_USERSPACE,
(caddr_t)pr->ps_auxinfo, nhdr.descsz, 0);
if (error)
return (error);
}
size += notesize;
#ifdef PT_WCOOKIE
notesize = sizeof(nhdr) + elfround(sizeof("OpenBSD")) +
elfround(sizeof(register_t));
if (iocookie) {
register_t wcookie;
nhdr.namesz = sizeof("OpenBSD");
nhdr.descsz = sizeof(register_t);
nhdr.type = NT_OPENBSD_WCOOKIE;
wcookie = process_get_wcookie(p);
error = coredump_writenote_elf(p, iocookie, &nhdr,
"OpenBSD", &wcookie);
if (error)
return (error);
}
size += notesize;
#endif
/*
* Now write the register info for the thread that caused the
* coredump.
*/
error = coredump_note_elf(p, iocookie, &notesize);
if (error)
return (error);
size += notesize;
/*
* Now, for each thread, write the register info and any other
* per-thread notes. Since we're dumping core, all the other
* threads in the process have been stopped and the list can't
* change.
*/
TAILQ_FOREACH(q, &pr->ps_threads, p_thr_link) {
if (q == p) /* we've taken care of this thread */
continue;
error = coredump_note_elf(q, iocookie, &notesize);
if (error)
return (error);
size += notesize;
}
*sizep = size;
return (0);
}
int
coredump_note_elf(struct proc *p, void *iocookie, size_t *sizep)
{
Elf_Note nhdr;
int size, notesize, error;
int namesize;
char name[64+ELFROUNDSIZE];
struct reg intreg;
#ifdef PT_GETFPREGS
struct fpreg freg;
#endif
#ifdef PT_PACMASK
register_t pacmask[2];
#endif
size = 0;
snprintf(name, sizeof(name)-ELFROUNDSIZE, "%s@%d",
"OpenBSD", p->p_tid + THREAD_PID_OFFSET);
namesize = strlen(name) + 1;
memset(name + namesize, 0, elfround(namesize) - namesize);
notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(intreg));
if (iocookie) {
error = process_read_regs(p, &intreg);
if (error)
return (error);
nhdr.namesz = namesize;
nhdr.descsz = sizeof(intreg);
nhdr.type = NT_OPENBSD_REGS;
error = coredump_writenote_elf(p, iocookie, &nhdr,
name, &intreg);
if (error)
return (error);
}
size += notesize;
#ifdef PT_GETFPREGS
notesize = sizeof(nhdr) + elfround(namesize) + elfround(sizeof(freg));
if (iocookie) {
error = process_read_fpregs(p, &freg);
if (error)
return (error);
nhdr.namesz = namesize;
nhdr.descsz = sizeof(freg);
nhdr.type = NT_OPENBSD_FPREGS;
error = coredump_writenote_elf(p, iocookie, &nhdr, name, &freg);
if (error)
return (error);
}
size += notesize;
#endif
#ifdef PT_PACMASK
notesize = sizeof(nhdr) + elfround(namesize) +
elfround(sizeof(pacmask));
if (iocookie) {
pacmask[0] = pacmask[1] = process_get_pacmask(p);
nhdr.namesz = namesize;
nhdr.descsz = sizeof(pacmask);
nhdr.type = NT_OPENBSD_PACMASK;
error = coredump_writenote_elf(p, iocookie, &nhdr,
name, &pacmask);
if (error)
return (error);
}
size += notesize;
#endif
*sizep = size;
/* XXX Add hook for machdep per-LWP notes. */
return (0);
}
int
coredump_writenote_elf(struct proc *p, void *cookie, Elf_Note *nhdr,
const char *name, void *data)
{
int error;
error = coredump_write(cookie, UIO_SYSSPACE, nhdr, sizeof(*nhdr), 0);
if (error)
return error;
error = coredump_write(cookie, UIO_SYSSPACE, name,
elfround(nhdr->namesz), 0);
if (error)
return error;
return coredump_write(cookie, UIO_SYSSPACE, data, nhdr->descsz, 0);
}
#endif /* !SMALL_KERNEL */
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