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![David Howells](/assets/img/avatar_default.png)
Suppress A.OUT library support if CONFIG_ARCH_SUPPORTS_AOUT is not set. Not all architectures support the A.OUT binfmt, so the ELF binfmt should not be permitted to go looking for A.OUT libraries to load in such a case. Not only that, but under such conditions A.OUT core dumps are not produced either. To make this work, this patch also does the following: (1) Makes the existence of the contents of linux/a.out.h contingent on CONFIG_ARCH_SUPPORTS_AOUT. (2) Renames dump_thread() to aout_dump_thread() as it's only called by A.OUT core dumping code. (3) Moves aout_dump_thread() into asm/a.out-core.h and makes it inline. This is then included only where needed. This means that this bit of arch code will be stored in the appropriate A.OUT binfmt module rather than the core kernel. (4) Drops A.OUT support for Blackfin (according to Mike Frysinger it's not needed) and FRV. This patch depends on the previous patch to move STACK_TOP[_MAX] out of asm/a.out.h and into asm/processor.h as they're required whether or not A.OUT format is available. [jdike@addtoit.com: uml: re-remove accidentally restored code] Signed-off-by: David Howells <dhowells@redhat.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
558 lines
15 KiB
C
558 lines
15 KiB
C
/*
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* linux/fs/binfmt_aout.c
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*
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* Copyright (C) 1991, 1992, 1996 Linus Torvalds
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*/
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#include <linux/module.h>
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/a.out.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 <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/cacheflush.h>
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#include <asm/a.out-core.h>
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static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
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static int load_aout_library(struct file*);
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static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
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static struct linux_binfmt aout_format = {
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.module = THIS_MODULE,
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.load_binary = load_aout_binary,
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.load_shlib = load_aout_library,
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.core_dump = aout_core_dump,
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.min_coredump = PAGE_SIZE
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};
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#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
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static int set_brk(unsigned long start, unsigned long end)
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{
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start = PAGE_ALIGN(start);
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end = PAGE_ALIGN(end);
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if (end > start) {
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unsigned long addr;
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down_write(¤t->mm->mmap_sem);
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addr = do_brk(start, end - start);
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up_write(¤t->mm->mmap_sem);
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if (BAD_ADDR(addr))
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return addr;
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}
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return 0;
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}
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/*
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* These are the only things you should do on a core-file: use only these
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* macros to write out all the necessary info.
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*/
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static int dump_write(struct file *file, const void *addr, int nr)
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{
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return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
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}
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#define DUMP_WRITE(addr, nr) \
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if (!dump_write(file, (void *)(addr), (nr))) \
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goto end_coredump;
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#define DUMP_SEEK(offset) \
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if (file->f_op->llseek) { \
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if (file->f_op->llseek(file,(offset),0) != (offset)) \
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goto end_coredump; \
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} else file->f_pos = (offset)
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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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* Note that setuid/setgid files won't make a core-dump if the uid/gid
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* changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
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* field, which also makes sure the core-dumps won't be recursive if the
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* dumping of the process results in another error..
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*/
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static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
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{
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mm_segment_t fs;
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int has_dumped = 0;
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unsigned long dump_start, dump_size;
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struct user dump;
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#if defined(__alpha__)
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# define START_DATA(u) (u.start_data)
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#elif defined(__arm__)
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# define START_DATA(u) ((u.u_tsize << PAGE_SHIFT) + u.start_code)
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#elif defined(__sparc__)
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# define START_DATA(u) (u.u_tsize)
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#elif defined(__i386__) || defined(__mc68000__) || defined(__arch_um__)
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# define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
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#endif
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#ifdef __sparc__
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# define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
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#else
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# define START_STACK(u) (u.start_stack)
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#endif
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fs = get_fs();
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set_fs(KERNEL_DS);
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has_dumped = 1;
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current->flags |= PF_DUMPCORE;
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strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
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#ifndef __sparc__
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dump.u_ar0 = offsetof(struct user, regs);
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#endif
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dump.signal = signr;
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aout_dump_thread(regs, &dump);
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/* If the size of the dump file exceeds the rlimit, then see what would happen
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if we wrote the stack, but not the data area. */
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#ifdef __sparc__
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if ((dump.u_dsize + dump.u_ssize) > limit)
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dump.u_dsize = 0;
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#else
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if ((dump.u_dsize + dump.u_ssize+1) * PAGE_SIZE > limit)
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dump.u_dsize = 0;
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#endif
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/* Make sure we have enough room to write the stack and data areas. */
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#ifdef __sparc__
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if (dump.u_ssize > limit)
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dump.u_ssize = 0;
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#else
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if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
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dump.u_ssize = 0;
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#endif
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/* make sure we actually have a data and stack area to dump */
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set_fs(USER_DS);
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#ifdef __sparc__
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if (!access_ok(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize))
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dump.u_dsize = 0;
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if (!access_ok(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize))
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dump.u_ssize = 0;
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#else
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if (!access_ok(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
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dump.u_dsize = 0;
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if (!access_ok(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
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dump.u_ssize = 0;
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#endif
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set_fs(KERNEL_DS);
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/* struct user */
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DUMP_WRITE(&dump,sizeof(dump));
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/* Now dump all of the user data. Include malloced stuff as well */
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#ifndef __sparc__
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DUMP_SEEK(PAGE_SIZE);
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#endif
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/* now we start writing out the user space info */
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set_fs(USER_DS);
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/* Dump the data area */
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if (dump.u_dsize != 0) {
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dump_start = START_DATA(dump);
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#ifdef __sparc__
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dump_size = dump.u_dsize;
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#else
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dump_size = dump.u_dsize << PAGE_SHIFT;
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#endif
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DUMP_WRITE(dump_start,dump_size);
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}
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/* Now prepare to dump the stack area */
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if (dump.u_ssize != 0) {
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dump_start = START_STACK(dump);
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#ifdef __sparc__
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dump_size = dump.u_ssize;
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#else
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dump_size = dump.u_ssize << PAGE_SHIFT;
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#endif
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DUMP_WRITE(dump_start,dump_size);
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}
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/* Finally dump the task struct. Not be used by gdb, but could be useful */
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set_fs(KERNEL_DS);
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DUMP_WRITE(current,sizeof(*current));
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end_coredump:
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set_fs(fs);
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return has_dumped;
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}
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/*
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* create_aout_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 __user *create_aout_tables(char __user *p, struct linux_binprm * bprm)
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{
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char __user * __user *argv;
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char __user * __user *envp;
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unsigned long __user *sp;
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int argc = bprm->argc;
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int envc = bprm->envc;
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sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p);
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#ifdef __sparc__
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/* This imposes the proper stack alignment for a new process. */
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sp = (void __user *) (((unsigned long) sp) & ~7);
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if ((envc+argc+3)&1) --sp;
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#endif
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#ifdef __alpha__
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/* whee.. test-programs are so much fun. */
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put_user(0, --sp);
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put_user(0, --sp);
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if (bprm->loader) {
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put_user(0, --sp);
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put_user(0x3eb, --sp);
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put_user(bprm->loader, --sp);
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put_user(0x3ea, --sp);
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}
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put_user(bprm->exec, --sp);
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put_user(0x3e9, --sp);
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#endif
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sp -= envc+1;
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envp = (char __user * __user *) sp;
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sp -= argc+1;
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argv = (char __user * __user *) sp;
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#if defined(__i386__) || defined(__mc68000__) || defined(__arm__) || defined(__arch_um__)
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put_user((unsigned long) envp,--sp);
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put_user((unsigned long) argv,--sp);
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#endif
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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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char c;
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put_user(p,argv++);
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do {
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get_user(c,p++);
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} while (c);
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}
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put_user(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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char c;
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put_user(p,envp++);
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do {
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get_user(c,p++);
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} while (c);
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}
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put_user(NULL,envp);
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current->mm->env_end = (unsigned long) p;
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return sp;
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}
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/*
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* These are the functions used to load a.out style executables and shared
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* libraries. There is no binary dependent code anywhere else.
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*/
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static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
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{
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struct exec ex;
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unsigned long error;
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unsigned long fd_offset;
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unsigned long rlim;
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int retval;
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ex = *((struct exec *) bprm->buf); /* exec-header */
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if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
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N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
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N_TRSIZE(ex) || N_DRSIZE(ex) ||
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i_size_read(bprm->file->f_path.dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
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return -ENOEXEC;
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}
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/*
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* Requires a mmap handler. This prevents people from using a.out
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* as part of an exploit attack against /proc-related vulnerabilities.
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*/
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if (!bprm->file->f_op || !bprm->file->f_op->mmap)
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return -ENOEXEC;
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fd_offset = N_TXTOFF(ex);
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/* Check initial limits. This avoids letting people circumvent
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* size limits imposed on them by creating programs with large
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* arrays in the data or bss.
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*/
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rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
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if (rlim >= RLIM_INFINITY)
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rlim = ~0;
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if (ex.a_data + ex.a_bss > rlim)
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return -ENOMEM;
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/* Flush all traces of the currently running executable */
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retval = flush_old_exec(bprm);
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if (retval)
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return retval;
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/* OK, This is the point of no return */
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#if defined(__alpha__)
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SET_AOUT_PERSONALITY(bprm, ex);
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#elif defined(__sparc__)
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set_personality(PER_SUNOS);
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#if !defined(__sparc_v9__)
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memcpy(¤t->thread.core_exec, &ex, sizeof(struct exec));
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#endif
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#else
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set_personality(PER_LINUX);
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#endif
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current->mm->end_code = ex.a_text +
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(current->mm->start_code = N_TXTADDR(ex));
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current->mm->end_data = ex.a_data +
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(current->mm->start_data = N_DATADDR(ex));
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current->mm->brk = ex.a_bss +
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(current->mm->start_brk = N_BSSADDR(ex));
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current->mm->free_area_cache = current->mm->mmap_base;
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current->mm->cached_hole_size = 0;
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compute_creds(bprm);
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current->flags &= ~PF_FORKNOEXEC;
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#ifdef __sparc__
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if (N_MAGIC(ex) == NMAGIC) {
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loff_t pos = fd_offset;
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/* Fuck me plenty... */
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/* <AOL></AOL> */
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down_write(¤t->mm->mmap_sem);
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error = do_brk(N_TXTADDR(ex), ex.a_text);
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up_write(¤t->mm->mmap_sem);
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bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
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ex.a_text, &pos);
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down_write(¤t->mm->mmap_sem);
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error = do_brk(N_DATADDR(ex), ex.a_data);
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up_write(¤t->mm->mmap_sem);
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bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
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ex.a_data, &pos);
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goto beyond_if;
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}
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#endif
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if (N_MAGIC(ex) == OMAGIC) {
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unsigned long text_addr, map_size;
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loff_t pos;
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text_addr = N_TXTADDR(ex);
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#if defined(__alpha__) || defined(__sparc__)
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pos = fd_offset;
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map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
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#else
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pos = 32;
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map_size = ex.a_text+ex.a_data;
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#endif
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down_write(¤t->mm->mmap_sem);
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error = do_brk(text_addr & PAGE_MASK, map_size);
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up_write(¤t->mm->mmap_sem);
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if (error != (text_addr & PAGE_MASK)) {
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send_sig(SIGKILL, current, 0);
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return error;
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}
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error = bprm->file->f_op->read(bprm->file,
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(char __user *)text_addr,
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ex.a_text+ex.a_data, &pos);
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if ((signed long)error < 0) {
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send_sig(SIGKILL, current, 0);
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return error;
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}
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flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
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} else {
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static unsigned long error_time, error_time2;
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if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
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(N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ)
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{
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printk(KERN_NOTICE "executable not page aligned\n");
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error_time2 = jiffies;
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}
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if ((fd_offset & ~PAGE_MASK) != 0 &&
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(jiffies-error_time) > 5*HZ)
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{
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printk(KERN_WARNING
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"fd_offset is not page aligned. Please convert program: %s\n",
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bprm->file->f_path.dentry->d_name.name);
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error_time = jiffies;
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}
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if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
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loff_t pos = fd_offset;
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down_write(¤t->mm->mmap_sem);
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do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
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up_write(¤t->mm->mmap_sem);
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bprm->file->f_op->read(bprm->file,
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(char __user *)N_TXTADDR(ex),
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ex.a_text+ex.a_data, &pos);
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flush_icache_range((unsigned long) N_TXTADDR(ex),
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(unsigned long) N_TXTADDR(ex) +
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ex.a_text+ex.a_data);
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goto beyond_if;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
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PROT_READ | PROT_EXEC,
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MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
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fd_offset);
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up_write(¤t->mm->mmap_sem);
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if (error != N_TXTADDR(ex)) {
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send_sig(SIGKILL, current, 0);
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return error;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
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PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
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fd_offset + ex.a_text);
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up_write(¤t->mm->mmap_sem);
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if (error != N_DATADDR(ex)) {
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send_sig(SIGKILL, current, 0);
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return error;
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}
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}
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beyond_if:
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set_binfmt(&aout_format);
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retval = set_brk(current->mm->start_brk, current->mm->brk);
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if (retval < 0) {
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send_sig(SIGKILL, current, 0);
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return retval;
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}
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retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
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if (retval < 0) {
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/* Someone check-me: is this error path enough? */
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|
send_sig(SIGKILL, current, 0);
|
|
return retval;
|
|
}
|
|
|
|
current->mm->start_stack =
|
|
(unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
|
|
#ifdef __alpha__
|
|
regs->gp = ex.a_gpvalue;
|
|
#endif
|
|
start_thread(regs, ex.a_entry, current->mm->start_stack);
|
|
if (unlikely(current->ptrace & PT_PTRACED)) {
|
|
if (current->ptrace & PT_TRACE_EXEC)
|
|
ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
|
|
else
|
|
send_sig(SIGTRAP, current, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int load_aout_library(struct file *file)
|
|
{
|
|
struct inode * inode;
|
|
unsigned long bss, start_addr, len;
|
|
unsigned long error;
|
|
int retval;
|
|
struct exec ex;
|
|
|
|
inode = file->f_path.dentry->d_inode;
|
|
|
|
retval = -ENOEXEC;
|
|
error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
|
|
if (error != sizeof(ex))
|
|
goto out;
|
|
|
|
/* 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) ||
|
|
i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Requires a mmap handler. This prevents people from using a.out
|
|
* as part of an exploit attack against /proc-related vulnerabilities.
|
|
*/
|
|
if (!file->f_op || !file->f_op->mmap)
|
|
goto out;
|
|
|
|
if (N_FLAGS(ex))
|
|
goto out;
|
|
|
|
/* For QMAGIC, the starting address is 0x20 into the page. We mask
|
|
this off to get the starting address for the page */
|
|
|
|
start_addr = ex.a_entry & 0xfffff000;
|
|
|
|
if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
|
|
static unsigned long error_time;
|
|
loff_t pos = N_TXTOFF(ex);
|
|
|
|
if ((jiffies-error_time) > 5*HZ)
|
|
{
|
|
printk(KERN_WARNING
|
|
"N_TXTOFF is not page aligned. Please convert library: %s\n",
|
|
file->f_path.dentry->d_name.name);
|
|
error_time = jiffies;
|
|
}
|
|
down_write(¤t->mm->mmap_sem);
|
|
do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
|
|
up_write(¤t->mm->mmap_sem);
|
|
|
|
file->f_op->read(file, (char __user *)start_addr,
|
|
ex.a_text + ex.a_data, &pos);
|
|
flush_icache_range((unsigned long) start_addr,
|
|
(unsigned long) start_addr + ex.a_text + ex.a_data);
|
|
|
|
retval = 0;
|
|
goto out;
|
|
}
|
|
/* Now use mmap to map the library into memory. */
|
|
down_write(¤t->mm->mmap_sem);
|
|
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));
|
|
up_write(¤t->mm->mmap_sem);
|
|
retval = error;
|
|
if (error != start_addr)
|
|
goto out;
|
|
|
|
len = PAGE_ALIGN(ex.a_text + ex.a_data);
|
|
bss = ex.a_text + ex.a_data + ex.a_bss;
|
|
if (bss > len) {
|
|
down_write(¤t->mm->mmap_sem);
|
|
error = do_brk(start_addr + len, bss - len);
|
|
up_write(¤t->mm->mmap_sem);
|
|
retval = error;
|
|
if (error != start_addr + len)
|
|
goto out;
|
|
}
|
|
retval = 0;
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static int __init init_aout_binfmt(void)
|
|
{
|
|
return register_binfmt(&aout_format);
|
|
}
|
|
|
|
static void __exit exit_aout_binfmt(void)
|
|
{
|
|
unregister_binfmt(&aout_format);
|
|
}
|
|
|
|
core_initcall(init_aout_binfmt);
|
|
module_exit(exit_aout_binfmt);
|
|
MODULE_LICENSE("GPL");
|