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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2010 Konstantin Belousov <kib@freebsd.org>
* 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. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/auxv.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <machine/tls.h>
#include <link.h>
#include <stddef.h>
#include <string.h>
#include "libc_private.h"
void __pthread_map_stacks_exec(void);
int
__elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr)
{
const Elf_Phdr *ph;
int i;
for (i = 0; i < phdr_info->dlpi_phnum; i++) {
ph = &phdr_info->dlpi_phdr[i];
if (ph->p_type != PT_LOAD)
continue;
/* ELFv1 ABI for powerpc64 passes function descriptor
* pointers around, not function pointers. The function
* descriptors live in .opd, which is a non-executable segment.
* The PF_X check would therefore make all address checks fail,
* causing a crash in some instances. Don't skip over
* non-executable segments in the ELFv1 powerpc64 case.
*/
#if !defined(__powerpc64__) || (defined(_CALL_ELF) && _CALL_ELF == 2)
if ((ph->p_flags & PF_X) == 0)
continue;
#endif
if (phdr_info->dlpi_addr + ph->p_vaddr <= (uintptr_t)addr &&
(uintptr_t)addr < phdr_info->dlpi_addr +
ph->p_vaddr + ph->p_memsz)
break;
}
return (i != phdr_info->dlpi_phnum);
}
void
__libc_map_stacks_exec(void)
{
int mib[2];
struct rlimit rlim;
u_long usrstack, stacksz;
size_t len;
if (_elf_aux_info(AT_USRSTACKBASE, &usrstack, sizeof(usrstack)) != 0) {
mib[0] = CTL_KERN;
mib[1] = KERN_USRSTACK;
len = sizeof(usrstack);
if (sysctl(mib, nitems(mib), &usrstack, &len, NULL, 0) == -1)
return;
}
if (_elf_aux_info(AT_USRSTACKLIM, &stacksz, sizeof(stacksz)) != 0) {
if (getrlimit(RLIMIT_STACK, &rlim) == -1)
return;
stacksz = rlim.rlim_cur;
}
mprotect((void *)(uintptr_t)(usrstack - stacksz), stacksz,
_rtld_get_stack_prot());
}
#pragma weak __pthread_map_stacks_exec
void
__pthread_map_stacks_exec(void)
{
((void (*)(void))__libc_interposing[INTERPOS_map_stacks_exec])();
}
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