1 /* 2 * Copyright (c) 2010 Konstantin Belousov <kib@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Neither the name of the author nor the names of any co-contributors 11 * may be used to endorse or promote products derived from this software 12 * without specific prior written permission. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/types.h> 30 #include <sys/mman.h> 31 #include <sys/resource.h> 32 #include <sys/sysctl.h> 33 #include <link.h> 34 #include <stddef.h> 35 36 int 37 __elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr) 38 { 39 const Elf_Phdr *ph; 40 int i; 41 42 for (i = 0; i < phdr_info->dlpi_phnum; i++) { 43 ph = &phdr_info->dlpi_phdr[i]; 44 if (ph->p_type != PT_LOAD || (ph->p_flags & PF_X) == 0) 45 continue; 46 if (phdr_info->dlpi_addr + ph->p_vaddr <= (uintptr_t)addr && 47 (uintptr_t)addr + sizeof(addr) < phdr_info->dlpi_addr + 48 ph->p_vaddr + ph->p_memsz) 49 break; 50 } 51 return (i != phdr_info->dlpi_phnum); 52 } 53 54 #pragma weak __pthread_map_stacks_exec 55 void 56 __pthread_map_stacks_exec(void) 57 { 58 int mib[2]; 59 struct rlimit rlim; 60 u_long usrstack; 61 size_t len; 62 63 mib[0] = CTL_KERN; 64 mib[1] = KERN_USRSTACK; 65 len = sizeof(usrstack); 66 if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), &usrstack, &len, NULL, 0) 67 == -1) 68 return; 69 if (getrlimit(RLIMIT_STACK, &rlim) == -1) 70 return; 71 mprotect((void *)(uintptr_t)(usrstack - rlim.rlim_cur), 72 rlim.rlim_cur, _rtld_get_stack_prot()); 73 } 74 75