URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [fs/] [binfmt_aout.c] - Rev 1782
Go to most recent revision | Compare with Previous | Blame | View Log
/* * linux/fs/binfmt_aout.c * * Copyright (C) 1991, 1992, 1996 Linus Torvalds */ #include <linux/module.h> #include <linux/fs.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/mman.h> #include <linux/a.out.h> #include <linux/errno.h> #include <linux/signal.h> #include <linux/string.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/ptrace.h> #include <linux/user.h> #include <linux/malloc.h> #include <linux/binfmts.h> #include <linux/personality.h> #include <asm/system.h> #include <asm/segment.h> #include <asm/pgtable.h> static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs); static int load_aout_library(int fd); static int aout_core_dump(long signr, struct pt_regs * regs); extern void dump_thread(struct pt_regs *, struct user *); static struct linux_binfmt aout_format = { #ifndef MODULE NULL, NULL, load_aout_binary, load_aout_library, aout_core_dump #else NULL, &mod_use_count_, load_aout_binary, load_aout_library, aout_core_dump #endif }; static void set_brk(unsigned long start, unsigned long end) { start = PAGE_ALIGN(start); end = PAGE_ALIGN(end); if (end <= start) return; do_mmap(NULL, start, end - start, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE, 0); } /* * These are the only things you should do on a core-file: use only these * macros to write out all the necessary info. */ #define DUMP_WRITE(addr,nr) \ while (file.f_op->write(inode,&file,(char *)(addr),(nr)) != (nr)) goto close_coredump #define DUMP_SEEK(offset) \ if (file.f_op->lseek) { \ if (file.f_op->lseek(inode,&file,(offset),0) != (offset)) \ goto close_coredump; \ } else file.f_pos = (offset) /* * Routine writes a core dump image in the current directory. * Currently only a stub-function. * * Note that setuid/setgid files won't make a core-dump if the uid/gid * changed due to the set[u|g]id. It's enforced by the "current->dumpable" * field, which also makes sure the core-dumps won't be recursive if the * dumping of the process results in another error.. */ static inline int do_aout_core_dump(long signr, struct pt_regs * regs) { struct inode * inode = NULL; struct file file; unsigned short fs; int has_dumped = 0; char corefile[6+sizeof(current->comm)]; unsigned long dump_start, dump_size; struct user dump; #ifdef __alpha__ # define START_DATA(u) (u.start_data) #elif defined(CONFIG_ARM) # define START_DATA(u) ((u.u_tsize << PAGE_SHIFT) + u.start_code) #else # define START_DATA(u) (u.u_tsize << PAGE_SHIFT) #endif if (!current->dumpable || current->mm->count != 1) return 0; current->dumpable = 0; /* See if we have enough room to write the upage. */ if (current->rlim[RLIMIT_CORE].rlim_cur < PAGE_SIZE) return 0; fs = get_fs(); set_fs(KERNEL_DS); memcpy(corefile,"core.",5); #if 0 memcpy(corefile+5,current->comm,sizeof(current->comm)); #else corefile[4] = '\0'; #endif if (open_namei(corefile,O_CREAT | 2 | O_TRUNC,0600,&inode,NULL)) { inode = NULL; goto end_coredump; } if (!S_ISREG(inode->i_mode)) goto end_coredump; if (!inode->i_op || !inode->i_op->default_file_ops) goto end_coredump; if (get_write_access(inode)) goto end_coredump; file.f_mode = 3; file.f_flags = 0; file.f_count = 1; file.f_inode = inode; file.f_pos = 0; file.f_reada = 0; file.f_op = inode->i_op->default_file_ops; if (file.f_op->open) if (file.f_op->open(inode,&file)) goto done_coredump; if (!file.f_op->write) goto close_coredump; has_dumped = 1; current->flags |= PF_DUMPCORE; strncpy(dump.u_comm, current->comm, sizeof(current->comm)); dump.u_ar0 = (void *)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump))); dump.signal = signr; dump_thread(regs, &dump); /* If the size of the dump file exceeds the rlimit, then see what would happen if we wrote the stack, but not the data area. */ if ((dump.u_dsize+dump.u_ssize+1) * PAGE_SIZE > current->rlim[RLIMIT_CORE].rlim_cur) dump.u_dsize = 0; /* Make sure we have enough room to write the stack and data areas. */ if ((dump.u_ssize+1) * PAGE_SIZE > current->rlim[RLIMIT_CORE].rlim_cur) dump.u_ssize = 0; /* make sure we actually have a data and stack area to dump */ set_fs(USER_DS); if (verify_area(VERIFY_READ, (void *) START_DATA(dump), dump.u_dsize << PAGE_SHIFT)) dump.u_dsize = 0; if (verify_area(VERIFY_READ, (void *) dump.start_stack, dump.u_ssize << PAGE_SHIFT)) dump.u_ssize = 0; set_fs(KERNEL_DS); /* struct user */ DUMP_WRITE(&dump,sizeof(dump)); /* Now dump all of the user data. Include malloced stuff as well */ DUMP_SEEK(PAGE_SIZE); /* now we start writing out the user space info */ set_fs(USER_DS); /* Dump the data area */ if (dump.u_dsize != 0) { dump_start = START_DATA(dump); dump_size = dump.u_dsize << PAGE_SHIFT; DUMP_WRITE(dump_start,dump_size); } /* Now prepare to dump the stack area */ if (dump.u_ssize != 0) { dump_start = dump.start_stack; dump_size = dump.u_ssize << PAGE_SHIFT; DUMP_WRITE(dump_start,dump_size); } /* Finally dump the task struct. Not be used by gdb, but could be useful */ set_fs(KERNEL_DS); DUMP_WRITE(current,sizeof(*current)); close_coredump: if (file.f_op->release) file.f_op->release(inode,&file); done_coredump: put_write_access(inode); end_coredump: set_fs(fs); iput(inode); return has_dumped; } static int aout_core_dump(long signr, struct pt_regs * regs) { int retval; MOD_INC_USE_COUNT; retval = do_aout_core_dump(signr, regs); MOD_DEC_USE_COUNT; return retval; } /* * create_aout_tables() parses the env- and arg-strings in new user * memory and creates the pointer tables from them, and puts their * addresses on the "stack", returning the new stack pointer value. */ static unsigned long * create_aout_tables(char * p, struct linux_binprm * bprm) { unsigned long *argv,*envp; unsigned long * sp; int argc = bprm->argc; int envc = bprm->envc; sp = (unsigned long *) ((-(unsigned long)sizeof(char *)) & (unsigned long) p); #ifdef __alpha__ /* whee.. test-programs are so much fun. */ put_user(0, --sp); put_user(0, --sp); if (bprm->loader) { put_user(0, --sp); put_user(0x3eb, --sp); put_user(bprm->loader, --sp); put_user(0x3ea, --sp); } put_user(bprm->exec, --sp); put_user(0x3e9, --sp); #endif sp -= envc+1; envp = sp; sp -= argc+1; argv = sp; #if defined(__i386__) || defined(__mc68000__) || defined(CONFIG_ARM) put_user(envp,--sp); put_user(argv,--sp); #endif put_user(argc,--sp); current->mm->arg_start = (unsigned long) p; while (argc-->0) { put_user(p,argv++); while (get_user(p++)) /* nothing */ ; } put_user(NULL,argv); current->mm->arg_end = current->mm->env_start = (unsigned long) p; while (envc-->0) { put_user(p,envp++); while (get_user(p++)) /* nothing */ ; } put_user(NULL,envp); current->mm->env_end = (unsigned long) p; return sp; } /* * These are the functions used to load a.out style executables and shared * libraries. There is no binary dependent code anywhere else. */ static inline int do_load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs) { struct exec ex; struct file * file; int fd; unsigned long error; unsigned long p = bprm->p; unsigned long fd_offset; unsigned long rlim; ex = *((struct exec *) bprm->buf); /* exec-header */ if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) || N_DRSIZE(ex) || bprm->inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { return -ENOEXEC; } current->personality = PER_LINUX; fd_offset = N_TXTOFF(ex); #if defined (__i386__) || defined (CONFIG_ARM) if (N_MAGIC(ex) == ZMAGIC && fd_offset != BLOCK_SIZE) { printk(KERN_NOTICE "N_TXTOFF != BLOCK_SIZE. See a.out.h.\n"); return -ENOEXEC; } if (N_MAGIC(ex) == ZMAGIC && ex.a_text && (fd_offset < bprm->inode->i_sb->s_blocksize)) { printk(KERN_NOTICE "N_TXTOFF < BLOCK_SIZE. Please convert binary.\n"); return -ENOEXEC; } #endif #if defined(CONFIG_ARM) if (N_MACHTYPE(ex) != M_ARM) { printk(KERN_NOTICE "Binary != ARM. Please recompile binary.\n"); return -ENOEXEC; } #endif /* Check initial limits. This avoids letting people circumvent * size limits imposed on them by creating programs with large * arrays in the data or bss. */ rlim = current->rlim[RLIMIT_DATA].rlim_cur; if (rlim >= RLIM_INFINITY) rlim = ~0; if (ex.a_data + ex.a_bss > rlim) return -ENOMEM; if (flush_old_exec(bprm)) return -ENOMEM; /* OK, This is the point of no return */ current->mm->end_code = ex.a_text + (current->mm->start_code = N_TXTADDR(ex)); current->mm->end_data = ex.a_data + (current->mm->start_data = N_DATADDR(ex)); current->mm->brk = ex.a_bss + (current->mm->start_brk = N_BSSADDR(ex)); current->mm->rss = 0; current->mm->mmap = NULL; current->suid = current->euid = current->fsuid = bprm->e_uid; current->sgid = current->egid = current->fsgid = bprm->e_gid; current->flags &= ~PF_FORKNOEXEC; if (N_MAGIC(ex) == OMAGIC) { #if defined(__alpha__) || defined(CONFIG_ARM) #ifndef CONFIG_ARM do_mmap(NULL, N_TXTADDR(ex) & PAGE_MASK, ex.a_text+ex.a_data + PAGE_SIZE - 1, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_FIXED|MAP_PRIVATE, 0); #else do_mmap(NULL, N_TXTADDR(ex), ex.a_text+ex.a_data, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_FIXED|MAP_PRIVATE, 0); #endif read_exec(bprm->inode, fd_offset, (char *) N_TXTADDR(ex), ex.a_text+ex.a_data, 0); #else do_mmap(NULL, 0, ex.a_text+ex.a_data, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_FIXED|MAP_PRIVATE, 0); read_exec(bprm->inode, 32, (char *) 0, ex.a_text+ex.a_data, 0); #endif } else { if (ex.a_text & 0xfff || ex.a_data & 0xfff) printk(KERN_NOTICE "executable not page aligned\n"); fd = open_inode(bprm->inode, O_RDONLY); if (fd < 0) { send_sig(SIGKILL, current, 0); return fd; } file = current->files->fd[fd]; if (!file->f_op || !file->f_op->mmap) { sys_close(fd); do_mmap(NULL, 0, ex.a_text+ex.a_data, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_FIXED|MAP_PRIVATE, 0); read_exec(bprm->inode, fd_offset, (char *) N_TXTADDR(ex), ex.a_text+ex.a_data, 0); goto beyond_if; } error = do_mmap(file, N_TXTADDR(ex), ex.a_text, PROT_READ | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE, fd_offset); if (error != N_TXTADDR(ex)) { sys_close(fd); send_sig(SIGKILL, current, 0); return error; } error = do_mmap(file, N_DATADDR(ex), ex.a_data, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE, fd_offset + ex.a_text); sys_close(fd); if (error != N_DATADDR(ex)) { send_sig(SIGKILL, current, 0); return error; } } beyond_if: if (current->exec_domain && current->exec_domain->use_count) (*current->exec_domain->use_count)--; if (current->binfmt && current->binfmt->use_count) (*current->binfmt->use_count)--; current->exec_domain = lookup_exec_domain(current->personality); current->binfmt = &aout_format; if (current->exec_domain && current->exec_domain->use_count) (*current->exec_domain->use_count)++; if (current->binfmt && current->binfmt->use_count) (*current->binfmt->use_count)++; set_brk(current->mm->start_brk, current->mm->brk); p = setup_arg_pages(p, bprm); p = (unsigned long) create_aout_tables((char *)p, bprm); current->mm->start_stack = p; #ifdef __alpha__ regs->gp = ex.a_gpvalue; #endif start_thread(regs, ex.a_entry, p); if (current->flags & PF_PTRACED) send_sig(SIGTRAP, current, 0); #ifndef CONFIG_ARM return 0; #else return regs->ARM_r0; #endif } static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs) { int retval; MOD_INC_USE_COUNT; retval = do_load_aout_binary(bprm, regs); MOD_DEC_USE_COUNT; return retval; } static inline int do_load_aout_library(int fd) { struct file * file; struct exec ex; struct inode * inode; unsigned int len; unsigned int bss; unsigned int start_addr; unsigned long error; file = current->files->fd[fd]; inode = file->f_inode; if (!file || !file->f_op) return -EACCES; /* Seek into the file */ if (file->f_op->lseek) { if ((error = file->f_op->lseek(inode, file, 0, 0)) != 0) return -ENOEXEC; } else file->f_pos = 0; set_fs(KERNEL_DS); error = file->f_op->read(inode, file, (char *) &ex, sizeof(ex)); set_fs(USER_DS); if (error != sizeof(ex)) return -ENOEXEC; /* We come in here for the regular a.out style of shared libraries */ if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) || N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) || inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { return -ENOEXEC; } if (N_MAGIC(ex) == ZMAGIC && N_TXTOFF(ex) && (N_TXTOFF(ex) < inode->i_sb->s_blocksize)) { printk("N_TXTOFF < BLOCK_SIZE. Please convert library\n"); return -ENOEXEC; } if (N_FLAGS(ex)) return -ENOEXEC; /* For QMAGIC, the starting address is 0x20 into the page. We mask this off to get the starting address for the page */ #ifndef CONFIG_ARM start_addr = ex.a_entry & 0xfffff000; /* Now use mmap to map the library into memory. */ error = do_mmap(file, start_addr, ex.a_text + ex.a_data, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, N_TXTOFF(ex)); if (error != start_addr) return error; len = PAGE_ALIGN(ex.a_text + ex.a_data); bss = ex.a_text + ex.a_data + ex.a_bss; #else start_addr = ex.a_entry & 0xffff8000; { unsigned int offset; unsigned int length; switch (N_MAGIC(ex)) { case QMAGIC: offset = 0; length = ex.a_text + ex.a_data; break; case ZMAGIC: /* or QMAGIC */ offset = N_TXTOFF(ex); length = ex.a_text + ex.a_data; break; default: return -ENOEXEC; } /* Now use mmap to map the library into memory. */ error = do_mmap(file, start_addr, length, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, offset); if (error != start_addr) return error; len = PAGE_ALIGN(length); bss = length + ex.a_bss; } #endif if (bss > len) { error = do_mmap(NULL, start_addr + len, bss-len, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 0); if (error != start_addr + len) return error; } return 0; } static int load_aout_library(int fd) { int retval; MOD_INC_USE_COUNT; retval = do_load_aout_library(fd); MOD_DEC_USE_COUNT; return retval; } int init_aout_binfmt(void) { return register_binfmt(&aout_format); } #ifdef MODULE int init_module(void) { return init_aout_binfmt(); } void cleanup_module( void) { unregister_binfmt(&aout_format); } #endif
Go to most recent revision | Compare with Previous | Blame | View Log