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![Al Viro](/assets/img/avatar_default.png)
switch binfmts that use ->read() to that (and to kernel_read() in several cases in binfmt_flat - sure, it's nommu, but still, doing ->read() into kmalloc'ed buffer...) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
953 lines
26 KiB
C
953 lines
26 KiB
C
/****************************************************************************/
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/*
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* linux/fs/binfmt_flat.c
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*
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* Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
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* Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
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* Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
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* Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
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* based heavily on:
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*
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* linux/fs/binfmt_aout.c:
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* Copyright (C) 1991, 1992, 1996 Linus Torvalds
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* linux/fs/binfmt_flat.c for 2.0 kernel
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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* JAN/99 -- coded full program relocation (gerg@snapgear.com)
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*/
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/stat.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/slab.h>
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#include <linux/binfmts.h>
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#include <linux/personality.h>
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#include <linux/init.h>
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#include <linux/flat.h>
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#include <linux/syscalls.h>
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#include <asm/byteorder.h>
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#include <asm/uaccess.h>
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#include <asm/unaligned.h>
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#include <asm/cacheflush.h>
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#include <asm/page.h>
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/****************************************************************************/
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#if 0
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#define DEBUG 1
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#endif
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#ifdef DEBUG
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#define DBG_FLT(a...) printk(a)
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#else
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#define DBG_FLT(a...)
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#endif
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/*
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* User data (data section and bss) needs to be aligned.
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* We pick 0x20 here because it is the max value elf2flt has always
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* used in producing FLAT files, and because it seems to be large
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* enough to make all the gcc alignment related tests happy.
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*/
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#define FLAT_DATA_ALIGN (0x20)
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/*
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* User data (stack) also needs to be aligned.
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* Here we can be a bit looser than the data sections since this
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* needs to only meet arch ABI requirements.
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*/
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#define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN)
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#define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
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#define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
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struct lib_info {
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struct {
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unsigned long start_code; /* Start of text segment */
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unsigned long start_data; /* Start of data segment */
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unsigned long start_brk; /* End of data segment */
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unsigned long text_len; /* Length of text segment */
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unsigned long entry; /* Start address for this module */
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unsigned long build_date; /* When this one was compiled */
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short loaded; /* Has this library been loaded? */
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} lib_list[MAX_SHARED_LIBS];
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};
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#ifdef CONFIG_BINFMT_SHARED_FLAT
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static int load_flat_shared_library(int id, struct lib_info *p);
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#endif
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static int load_flat_binary(struct linux_binprm *);
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static int flat_core_dump(struct coredump_params *cprm);
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static struct linux_binfmt flat_format = {
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.module = THIS_MODULE,
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.load_binary = load_flat_binary,
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.core_dump = flat_core_dump,
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.min_coredump = PAGE_SIZE
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};
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/****************************************************************************/
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/*
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* Routine writes a core dump image in the current directory.
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* Currently only a stub-function.
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*/
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static int flat_core_dump(struct coredump_params *cprm)
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{
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printk("Process %s:%d received signr %d and should have core dumped\n",
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current->comm, current->pid, (int) cprm->siginfo->si_signo);
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return(1);
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}
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/****************************************************************************/
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/*
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* create_flat_tables() parses the env- and arg-strings in new user
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* memory and creates the pointer tables from them, and puts their
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* addresses on the "stack", returning the new stack pointer value.
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*/
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static unsigned long create_flat_tables(
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unsigned long pp,
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struct linux_binprm * bprm)
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{
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unsigned long *argv,*envp;
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unsigned long * sp;
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char * p = (char*)pp;
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int argc = bprm->argc;
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int envc = bprm->envc;
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char uninitialized_var(dummy);
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sp = (unsigned long *)p;
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sp -= (envc + argc + 2) + 1 + (flat_argvp_envp_on_stack() ? 2 : 0);
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sp = (unsigned long *) ((unsigned long)sp & -FLAT_STACK_ALIGN);
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argv = sp + 1 + (flat_argvp_envp_on_stack() ? 2 : 0);
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envp = argv + (argc + 1);
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if (flat_argvp_envp_on_stack()) {
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put_user((unsigned long) envp, sp + 2);
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put_user((unsigned long) argv, sp + 1);
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}
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put_user(argc, sp);
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current->mm->arg_start = (unsigned long) p;
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while (argc-->0) {
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put_user((unsigned long) p, argv++);
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do {
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get_user(dummy, p); p++;
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} while (dummy);
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}
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put_user((unsigned long) NULL, argv);
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current->mm->arg_end = current->mm->env_start = (unsigned long) p;
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while (envc-->0) {
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put_user((unsigned long)p, envp); envp++;
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do {
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get_user(dummy, p); p++;
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} while (dummy);
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}
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put_user((unsigned long) NULL, envp);
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current->mm->env_end = (unsigned long) p;
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return (unsigned long)sp;
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}
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/****************************************************************************/
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#ifdef CONFIG_BINFMT_ZFLAT
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#include <linux/zlib.h>
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#define LBUFSIZE 4000
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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static int decompress_exec(
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struct linux_binprm *bprm,
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unsigned long offset,
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char *dst,
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long len,
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int fd)
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{
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unsigned char *buf;
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z_stream strm;
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loff_t fpos;
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int ret, retval;
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DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
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memset(&strm, 0, sizeof(strm));
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strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
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if (strm.workspace == NULL) {
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DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
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return -ENOMEM;
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}
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buf = kmalloc(LBUFSIZE, GFP_KERNEL);
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if (buf == NULL) {
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DBG_FLT("binfmt_flat: no memory for read buffer\n");
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retval = -ENOMEM;
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goto out_free;
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}
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/* Read in first chunk of data and parse gzip header. */
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fpos = offset;
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ret = kernel_read(bprm->file, offset, buf, LBUFSIZE);
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strm.next_in = buf;
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strm.avail_in = ret;
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strm.total_in = 0;
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fpos += ret;
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retval = -ENOEXEC;
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/* Check minimum size -- gzip header */
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if (ret < 10) {
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DBG_FLT("binfmt_flat: file too small?\n");
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goto out_free_buf;
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}
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/* Check gzip magic number */
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if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
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DBG_FLT("binfmt_flat: unknown compression magic?\n");
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goto out_free_buf;
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}
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/* Check gzip method */
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if (buf[2] != 8) {
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DBG_FLT("binfmt_flat: unknown compression method?\n");
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goto out_free_buf;
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}
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/* Check gzip flags */
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if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
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(buf[3] & RESERVED)) {
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DBG_FLT("binfmt_flat: unknown flags?\n");
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goto out_free_buf;
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}
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ret = 10;
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if (buf[3] & EXTRA_FIELD) {
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ret += 2 + buf[10] + (buf[11] << 8);
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if (unlikely(LBUFSIZE <= ret)) {
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DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
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goto out_free_buf;
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}
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}
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if (buf[3] & ORIG_NAME) {
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while (ret < LBUFSIZE && buf[ret++] != 0)
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;
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if (unlikely(LBUFSIZE == ret)) {
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DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
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goto out_free_buf;
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}
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}
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if (buf[3] & COMMENT) {
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while (ret < LBUFSIZE && buf[ret++] != 0)
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;
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if (unlikely(LBUFSIZE == ret)) {
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DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
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goto out_free_buf;
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}
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}
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strm.next_in += ret;
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strm.avail_in -= ret;
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strm.next_out = dst;
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strm.avail_out = len;
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strm.total_out = 0;
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if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
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DBG_FLT("binfmt_flat: zlib init failed?\n");
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goto out_free_buf;
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}
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while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
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ret = kernel_read(bprm->file, fpos, buf, LBUFSIZE);
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if (ret <= 0)
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break;
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len -= ret;
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strm.next_in = buf;
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strm.avail_in = ret;
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strm.total_in = 0;
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fpos += ret;
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}
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if (ret < 0) {
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DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
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ret, strm.msg);
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goto out_zlib;
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}
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retval = 0;
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out_zlib:
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zlib_inflateEnd(&strm);
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out_free_buf:
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kfree(buf);
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out_free:
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kfree(strm.workspace);
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return retval;
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}
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#endif /* CONFIG_BINFMT_ZFLAT */
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/****************************************************************************/
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static unsigned long
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calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
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{
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unsigned long addr;
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int id;
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unsigned long start_brk;
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unsigned long start_data;
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unsigned long text_len;
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unsigned long start_code;
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#ifdef CONFIG_BINFMT_SHARED_FLAT
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if (r == 0)
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id = curid; /* Relocs of 0 are always self referring */
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else {
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id = (r >> 24) & 0xff; /* Find ID for this reloc */
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r &= 0x00ffffff; /* Trim ID off here */
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}
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if (id >= MAX_SHARED_LIBS) {
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printk("BINFMT_FLAT: reference 0x%x to shared library %d",
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(unsigned) r, id);
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goto failed;
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}
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if (curid != id) {
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if (internalp) {
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printk("BINFMT_FLAT: reloc address 0x%x not in same module "
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"(%d != %d)", (unsigned) r, curid, id);
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goto failed;
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} else if ( ! p->lib_list[id].loaded &&
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IS_ERR_VALUE(load_flat_shared_library(id, p))) {
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printk("BINFMT_FLAT: failed to load library %d", id);
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goto failed;
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}
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/* Check versioning information (i.e. time stamps) */
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if (p->lib_list[id].build_date && p->lib_list[curid].build_date &&
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p->lib_list[curid].build_date < p->lib_list[id].build_date) {
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printk("BINFMT_FLAT: library %d is younger than %d", id, curid);
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goto failed;
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}
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}
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#else
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id = 0;
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#endif
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start_brk = p->lib_list[id].start_brk;
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start_data = p->lib_list[id].start_data;
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start_code = p->lib_list[id].start_code;
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text_len = p->lib_list[id].text_len;
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if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
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printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)",
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(int) r,(int)(start_brk-start_data+text_len),(int)text_len);
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goto failed;
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}
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if (r < text_len) /* In text segment */
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addr = r + start_code;
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else /* In data segment */
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addr = r - text_len + start_data;
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/* Range checked already above so doing the range tests is redundant...*/
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return(addr);
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failed:
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printk(", killing %s!\n", current->comm);
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send_sig(SIGSEGV, current, 0);
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return RELOC_FAILED;
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}
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/****************************************************************************/
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void old_reloc(unsigned long rl)
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{
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#ifdef DEBUG
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char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
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#endif
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flat_v2_reloc_t r;
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unsigned long *ptr;
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r.value = rl;
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#if defined(CONFIG_COLDFIRE)
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ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset);
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#else
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ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset);
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#endif
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#ifdef DEBUG
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printk("Relocation of variable at DATASEG+%x "
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"(address %p, currently %x) into segment %s\n",
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r.reloc.offset, ptr, (int)*ptr, segment[r.reloc.type]);
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#endif
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switch (r.reloc.type) {
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case OLD_FLAT_RELOC_TYPE_TEXT:
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*ptr += current->mm->start_code;
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break;
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case OLD_FLAT_RELOC_TYPE_DATA:
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*ptr += current->mm->start_data;
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break;
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case OLD_FLAT_RELOC_TYPE_BSS:
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*ptr += current->mm->end_data;
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break;
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default:
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printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type);
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break;
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}
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#ifdef DEBUG
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printk("Relocation became %x\n", (int)*ptr);
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#endif
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}
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/****************************************************************************/
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static int load_flat_file(struct linux_binprm * bprm,
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struct lib_info *libinfo, int id, unsigned long *extra_stack)
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{
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struct flat_hdr * hdr;
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unsigned long textpos = 0, datapos = 0, result;
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unsigned long realdatastart = 0;
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unsigned long text_len, data_len, bss_len, stack_len, flags;
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unsigned long full_data;
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unsigned long len, memp = 0;
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unsigned long memp_size, extra, rlim;
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unsigned long *reloc = 0, *rp;
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struct inode *inode;
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int i, rev, relocs = 0;
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loff_t fpos;
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unsigned long start_code, end_code;
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int ret;
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hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
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inode = file_inode(bprm->file);
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text_len = ntohl(hdr->data_start);
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data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
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bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
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stack_len = ntohl(hdr->stack_size);
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if (extra_stack) {
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stack_len += *extra_stack;
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*extra_stack = stack_len;
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}
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relocs = ntohl(hdr->reloc_count);
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flags = ntohl(hdr->flags);
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rev = ntohl(hdr->rev);
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full_data = data_len + relocs * sizeof(unsigned long);
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if (strncmp(hdr->magic, "bFLT", 4)) {
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/*
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* Previously, here was a printk to tell people
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* "BINFMT_FLAT: bad header magic".
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* But for the kernel which also use ELF FD-PIC format, this
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* error message is confusing.
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* because a lot of people do not manage to produce good
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*/
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ret = -ENOEXEC;
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goto err;
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}
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if (flags & FLAT_FLAG_KTRACE)
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printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
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if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
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printk("BINFMT_FLAT: bad flat file version 0x%x (supported "
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"0x%lx and 0x%lx)\n",
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rev, FLAT_VERSION, OLD_FLAT_VERSION);
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ret = -ENOEXEC;
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goto err;
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}
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/* Don't allow old format executables to use shared libraries */
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if (rev == OLD_FLAT_VERSION && id != 0) {
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printk("BINFMT_FLAT: shared libraries are not available before rev 0x%x\n",
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(int) FLAT_VERSION);
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ret = -ENOEXEC;
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goto err;
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}
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/*
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* fix up the flags for the older format, there were all kinds
|
|
* of endian hacks, this only works for the simple cases
|
|
*/
|
|
if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
|
|
flags = FLAT_FLAG_RAM;
|
|
|
|
#ifndef CONFIG_BINFMT_ZFLAT
|
|
if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
|
|
printk("Support for ZFLAT executables is not enabled.\n");
|
|
ret = -ENOEXEC;
|
|
goto err;
|
|
}
|
|
#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 = rlimit(RLIMIT_DATA);
|
|
if (rlim >= RLIM_INFINITY)
|
|
rlim = ~0;
|
|
if (data_len + bss_len > rlim) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
/* Flush all traces of the currently running executable */
|
|
if (id == 0) {
|
|
result = flush_old_exec(bprm);
|
|
if (result) {
|
|
ret = result;
|
|
goto err;
|
|
}
|
|
|
|
/* OK, This is the point of no return */
|
|
set_personality(PER_LINUX_32BIT);
|
|
setup_new_exec(bprm);
|
|
}
|
|
|
|
/*
|
|
* calculate the extra space we need to map in
|
|
*/
|
|
extra = max_t(unsigned long, bss_len + stack_len,
|
|
relocs * sizeof(unsigned long));
|
|
|
|
/*
|
|
* there are a couple of cases here, the separate code/data
|
|
* case, and then the fully copied to RAM case which lumps
|
|
* it all together.
|
|
*/
|
|
if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
|
|
/*
|
|
* this should give us a ROM ptr, but if it doesn't we don't
|
|
* really care
|
|
*/
|
|
DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
|
|
|
|
textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
|
|
MAP_PRIVATE|MAP_EXECUTABLE, 0);
|
|
if (!textpos || IS_ERR_VALUE(textpos)) {
|
|
if (!textpos)
|
|
textpos = (unsigned long) -ENOMEM;
|
|
printk("Unable to mmap process text, errno %d\n", (int)-textpos);
|
|
ret = textpos;
|
|
goto err;
|
|
}
|
|
|
|
len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
|
|
len = PAGE_ALIGN(len);
|
|
realdatastart = vm_mmap(0, 0, len,
|
|
PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
|
|
|
|
if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) {
|
|
if (!realdatastart)
|
|
realdatastart = (unsigned long) -ENOMEM;
|
|
printk("Unable to allocate RAM for process data, errno %d\n",
|
|
(int)-realdatastart);
|
|
vm_munmap(textpos, text_len);
|
|
ret = realdatastart;
|
|
goto err;
|
|
}
|
|
datapos = ALIGN(realdatastart +
|
|
MAX_SHARED_LIBS * sizeof(unsigned long),
|
|
FLAT_DATA_ALIGN);
|
|
|
|
DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
|
|
(int)(data_len + bss_len + stack_len), (int)datapos);
|
|
|
|
fpos = ntohl(hdr->data_start);
|
|
#ifdef CONFIG_BINFMT_ZFLAT
|
|
if (flags & FLAT_FLAG_GZDATA) {
|
|
result = decompress_exec(bprm, fpos, (char *) datapos,
|
|
full_data, 0);
|
|
} else
|
|
#endif
|
|
{
|
|
result = read_code(bprm->file, datapos, fpos,
|
|
full_data);
|
|
}
|
|
if (IS_ERR_VALUE(result)) {
|
|
printk("Unable to read data+bss, errno %d\n", (int)-result);
|
|
vm_munmap(textpos, text_len);
|
|
vm_munmap(realdatastart, len);
|
|
ret = result;
|
|
goto err;
|
|
}
|
|
|
|
reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len));
|
|
memp = realdatastart;
|
|
memp_size = len;
|
|
} else {
|
|
|
|
len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
|
|
len = PAGE_ALIGN(len);
|
|
textpos = vm_mmap(0, 0, len,
|
|
PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
|
|
|
|
if (!textpos || IS_ERR_VALUE(textpos)) {
|
|
if (!textpos)
|
|
textpos = (unsigned long) -ENOMEM;
|
|
printk("Unable to allocate RAM for process text/data, errno %d\n",
|
|
(int)-textpos);
|
|
ret = textpos;
|
|
goto err;
|
|
}
|
|
|
|
realdatastart = textpos + ntohl(hdr->data_start);
|
|
datapos = ALIGN(realdatastart +
|
|
MAX_SHARED_LIBS * sizeof(unsigned long),
|
|
FLAT_DATA_ALIGN);
|
|
|
|
reloc = (unsigned long *)
|
|
(datapos + (ntohl(hdr->reloc_start) - text_len));
|
|
memp = textpos;
|
|
memp_size = len;
|
|
#ifdef CONFIG_BINFMT_ZFLAT
|
|
/*
|
|
* load it all in and treat it like a RAM load from now on
|
|
*/
|
|
if (flags & FLAT_FLAG_GZIP) {
|
|
result = decompress_exec(bprm, sizeof (struct flat_hdr),
|
|
(((char *) textpos) + sizeof (struct flat_hdr)),
|
|
(text_len + full_data
|
|
- sizeof (struct flat_hdr)),
|
|
0);
|
|
memmove((void *) datapos, (void *) realdatastart,
|
|
full_data);
|
|
} else if (flags & FLAT_FLAG_GZDATA) {
|
|
result = read_code(bprm->file, textpos, 0, text_len);
|
|
if (!IS_ERR_VALUE(result))
|
|
result = decompress_exec(bprm, text_len, (char *) datapos,
|
|
full_data, 0);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
result = read_code(bprm->file, textpos, 0, text_len);
|
|
if (!IS_ERR_VALUE(result))
|
|
result = read_code(bprm->file, datapos,
|
|
ntohl(hdr->data_start),
|
|
full_data);
|
|
}
|
|
if (IS_ERR_VALUE(result)) {
|
|
printk("Unable to read code+data+bss, errno %d\n",(int)-result);
|
|
vm_munmap(textpos, text_len + data_len + extra +
|
|
MAX_SHARED_LIBS * sizeof(unsigned long));
|
|
ret = result;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (flags & FLAT_FLAG_KTRACE)
|
|
printk("Mapping is %x, Entry point is %x, data_start is %x\n",
|
|
(int)textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
|
|
|
|
/* The main program needs a little extra setup in the task structure */
|
|
start_code = textpos + sizeof (struct flat_hdr);
|
|
end_code = textpos + text_len;
|
|
if (id == 0) {
|
|
current->mm->start_code = start_code;
|
|
current->mm->end_code = end_code;
|
|
current->mm->start_data = datapos;
|
|
current->mm->end_data = datapos + data_len;
|
|
/*
|
|
* set up the brk stuff, uses any slack left in data/bss/stack
|
|
* allocation. We put the brk after the bss (between the bss
|
|
* and stack) like other platforms.
|
|
* Userspace code relies on the stack pointer starting out at
|
|
* an address right at the end of a page.
|
|
*/
|
|
current->mm->start_brk = datapos + data_len + bss_len;
|
|
current->mm->brk = (current->mm->start_brk + 3) & ~3;
|
|
current->mm->context.end_brk = memp + memp_size - stack_len;
|
|
}
|
|
|
|
if (flags & FLAT_FLAG_KTRACE)
|
|
printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
|
|
id ? "Lib" : "Load", bprm->filename,
|
|
(int) start_code, (int) end_code,
|
|
(int) datapos,
|
|
(int) (datapos + data_len),
|
|
(int) (datapos + data_len),
|
|
(int) (((datapos + data_len + bss_len) + 3) & ~3));
|
|
|
|
text_len -= sizeof(struct flat_hdr); /* the real code len */
|
|
|
|
/* Store the current module values into the global library structure */
|
|
libinfo->lib_list[id].start_code = start_code;
|
|
libinfo->lib_list[id].start_data = datapos;
|
|
libinfo->lib_list[id].start_brk = datapos + data_len + bss_len;
|
|
libinfo->lib_list[id].text_len = text_len;
|
|
libinfo->lib_list[id].loaded = 1;
|
|
libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
|
|
libinfo->lib_list[id].build_date = ntohl(hdr->build_date);
|
|
|
|
/*
|
|
* We just load the allocations into some temporary memory to
|
|
* help simplify all this mumbo jumbo
|
|
*
|
|
* We've got two different sections of relocation entries.
|
|
* The first is the GOT which resides at the beginning of the data segment
|
|
* and is terminated with a -1. This one can be relocated in place.
|
|
* The second is the extra relocation entries tacked after the image's
|
|
* data segment. These require a little more processing as the entry is
|
|
* really an offset into the image which contains an offset into the
|
|
* image.
|
|
*/
|
|
if (flags & FLAT_FLAG_GOTPIC) {
|
|
for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) {
|
|
unsigned long addr;
|
|
if (*rp) {
|
|
addr = calc_reloc(*rp, libinfo, id, 0);
|
|
if (addr == RELOC_FAILED) {
|
|
ret = -ENOEXEC;
|
|
goto err;
|
|
}
|
|
*rp = addr;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now run through the relocation entries.
|
|
* We've got to be careful here as C++ produces relocatable zero
|
|
* entries in the constructor and destructor tables which are then
|
|
* tested for being not zero (which will always occur unless we're
|
|
* based from address zero). This causes an endless loop as __start
|
|
* is at zero. The solution used is to not relocate zero addresses.
|
|
* This has the negative side effect of not allowing a global data
|
|
* reference to be statically initialised to _stext (I've moved
|
|
* __start to address 4 so that is okay).
|
|
*/
|
|
if (rev > OLD_FLAT_VERSION) {
|
|
unsigned long persistent = 0;
|
|
for (i=0; i < relocs; i++) {
|
|
unsigned long addr, relval;
|
|
|
|
/* Get the address of the pointer to be
|
|
relocated (of course, the address has to be
|
|
relocated first). */
|
|
relval = ntohl(reloc[i]);
|
|
if (flat_set_persistent (relval, &persistent))
|
|
continue;
|
|
addr = flat_get_relocate_addr(relval);
|
|
rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1);
|
|
if (rp == (unsigned long *)RELOC_FAILED) {
|
|
ret = -ENOEXEC;
|
|
goto err;
|
|
}
|
|
|
|
/* Get the pointer's value. */
|
|
addr = flat_get_addr_from_rp(rp, relval, flags,
|
|
&persistent);
|
|
if (addr != 0) {
|
|
/*
|
|
* Do the relocation. PIC relocs in the data section are
|
|
* already in target order
|
|
*/
|
|
if ((flags & FLAT_FLAG_GOTPIC) == 0)
|
|
addr = ntohl(addr);
|
|
addr = calc_reloc(addr, libinfo, id, 0);
|
|
if (addr == RELOC_FAILED) {
|
|
ret = -ENOEXEC;
|
|
goto err;
|
|
}
|
|
|
|
/* Write back the relocated pointer. */
|
|
flat_put_addr_at_rp(rp, addr, relval);
|
|
}
|
|
}
|
|
} else {
|
|
for (i=0; i < relocs; i++)
|
|
old_reloc(ntohl(reloc[i]));
|
|
}
|
|
|
|
flush_icache_range(start_code, end_code);
|
|
|
|
/* zero the BSS, BRK and stack areas */
|
|
memset((void*)(datapos + data_len), 0, bss_len +
|
|
(memp + memp_size - stack_len - /* end brk */
|
|
libinfo->lib_list[id].start_brk) + /* start brk */
|
|
stack_len);
|
|
|
|
return 0;
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
|
|
/****************************************************************************/
|
|
#ifdef CONFIG_BINFMT_SHARED_FLAT
|
|
|
|
/*
|
|
* Load a shared library into memory. The library gets its own data
|
|
* segment (including bss) but not argv/argc/environ.
|
|
*/
|
|
|
|
static int load_flat_shared_library(int id, struct lib_info *libs)
|
|
{
|
|
struct linux_binprm bprm;
|
|
int res;
|
|
char buf[16];
|
|
|
|
memset(&bprm, 0, sizeof(bprm));
|
|
|
|
/* Create the file name */
|
|
sprintf(buf, "/lib/lib%d.so", id);
|
|
|
|
/* Open the file up */
|
|
bprm.filename = buf;
|
|
bprm.file = open_exec(bprm.filename);
|
|
res = PTR_ERR(bprm.file);
|
|
if (IS_ERR(bprm.file))
|
|
return res;
|
|
|
|
bprm.cred = prepare_exec_creds();
|
|
res = -ENOMEM;
|
|
if (!bprm.cred)
|
|
goto out;
|
|
|
|
/* We don't really care about recalculating credentials at this point
|
|
* as we're past the point of no return and are dealing with shared
|
|
* libraries.
|
|
*/
|
|
bprm.cred_prepared = 1;
|
|
|
|
res = prepare_binprm(&bprm);
|
|
|
|
if (!IS_ERR_VALUE(res))
|
|
res = load_flat_file(&bprm, libs, id, NULL);
|
|
|
|
abort_creds(bprm.cred);
|
|
|
|
out:
|
|
allow_write_access(bprm.file);
|
|
fput(bprm.file);
|
|
|
|
return(res);
|
|
}
|
|
|
|
#endif /* CONFIG_BINFMT_SHARED_FLAT */
|
|
/****************************************************************************/
|
|
|
|
/*
|
|
* These are the functions used to load flat style executables and shared
|
|
* libraries. There is no binary dependent code anywhere else.
|
|
*/
|
|
|
|
static int load_flat_binary(struct linux_binprm * bprm)
|
|
{
|
|
struct lib_info libinfo;
|
|
struct pt_regs *regs = current_pt_regs();
|
|
unsigned long p = bprm->p;
|
|
unsigned long stack_len;
|
|
unsigned long start_addr;
|
|
unsigned long *sp;
|
|
int res;
|
|
int i, j;
|
|
|
|
memset(&libinfo, 0, sizeof(libinfo));
|
|
/*
|
|
* We have to add the size of our arguments to our stack size
|
|
* otherwise it's too easy for users to create stack overflows
|
|
* by passing in a huge argument list. And yes, we have to be
|
|
* pedantic and include space for the argv/envp array as it may have
|
|
* a lot of entries.
|
|
*/
|
|
#define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
|
|
stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
|
|
stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
|
|
stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
|
|
stack_len += FLAT_STACK_ALIGN - 1; /* reserve for upcoming alignment */
|
|
|
|
res = load_flat_file(bprm, &libinfo, 0, &stack_len);
|
|
if (IS_ERR_VALUE(res))
|
|
return res;
|
|
|
|
/* Update data segment pointers for all libraries */
|
|
for (i=0; i<MAX_SHARED_LIBS; i++)
|
|
if (libinfo.lib_list[i].loaded)
|
|
for (j=0; j<MAX_SHARED_LIBS; j++)
|
|
(-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] =
|
|
(libinfo.lib_list[j].loaded)?
|
|
libinfo.lib_list[j].start_data:UNLOADED_LIB;
|
|
|
|
install_exec_creds(bprm);
|
|
|
|
set_binfmt(&flat_format);
|
|
|
|
p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
|
|
DBG_FLT("p=%x\n", (int)p);
|
|
|
|
/* copy the arg pages onto the stack, this could be more efficient :-) */
|
|
for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--)
|
|
* (char *) --p =
|
|
((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE];
|
|
|
|
sp = (unsigned long *) create_flat_tables(p, bprm);
|
|
|
|
/* Fake some return addresses to ensure the call chain will
|
|
* initialise library in order for us. We are required to call
|
|
* lib 1 first, then 2, ... and finally the main program (id 0).
|
|
*/
|
|
start_addr = libinfo.lib_list[0].entry;
|
|
|
|
#ifdef CONFIG_BINFMT_SHARED_FLAT
|
|
for (i = MAX_SHARED_LIBS-1; i>0; i--) {
|
|
if (libinfo.lib_list[i].loaded) {
|
|
/* Push previos first to call address */
|
|
--sp; put_user(start_addr, sp);
|
|
start_addr = libinfo.lib_list[i].entry;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Stash our initial stack pointer into the mm structure */
|
|
current->mm->start_stack = (unsigned long )sp;
|
|
|
|
#ifdef FLAT_PLAT_INIT
|
|
FLAT_PLAT_INIT(regs);
|
|
#endif
|
|
DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n",
|
|
(int)regs, (int)start_addr, (int)current->mm->start_stack);
|
|
|
|
start_thread(regs, start_addr, current->mm->start_stack);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static int __init init_flat_binfmt(void)
|
|
{
|
|
register_binfmt(&flat_format);
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
core_initcall(init_flat_binfmt);
|
|
|
|
/****************************************************************************/
|