diff options
Diffstat (limited to 'lib/libc/gen/elf_utils.c')
-rw-r--r-- | lib/libc/gen/elf_utils.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/lib/libc/gen/elf_utils.c b/lib/libc/gen/elf_utils.c new file mode 100644 index 0000000..7bd7511 --- /dev/null +++ b/lib/libc/gen/elf_utils.c @@ -0,0 +1,74 @@ +/* + * 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. + * + * $FreeBSD$ + */ + +#include <sys/types.h> +#include <sys/mman.h> +#include <sys/resource.h> +#include <sys/sysctl.h> +#include <link.h> +#include <stddef.h> + +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 || (ph->p_flags & PF_X) == 0) + continue; + if (phdr_info->dlpi_addr + ph->p_vaddr <= (uintptr_t)addr && + (uintptr_t)addr + sizeof(addr) < phdr_info->dlpi_addr + + ph->p_vaddr + ph->p_memsz) + break; + } + return (i != phdr_info->dlpi_phnum); +} + +#pragma weak __pthread_map_stacks_exec +void +__pthread_map_stacks_exec(void) +{ + int mib[2]; + struct rlimit rlim; + u_long usrstack; + size_t len; + + mib[0] = CTL_KERN; + mib[1] = KERN_USRSTACK; + len = sizeof(usrstack); + if (sysctl(mib, sizeof(mib) / sizeof(mib[0]), &usrstack, &len, NULL, 0) + == -1) + return; + if (getrlimit(RLIMIT_STACK, &rlim) == -1) + return; + mprotect((void *)(uintptr_t)(usrstack - rlim.rlim_cur), + rlim.rlim_cur, _rtld_get_stack_prot()); +} + |