mirror of
https://github.com/FEX-Emu/linux.git
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3c378158d4
The problem was introduced by commit "mm: variable length argument
support" (b6a2fea393
)
as it didn't update fs/binfmt_aout.c like other binfmt's.
I noticed that on alpha when accidentally launched old OSF/1
Acrobat Reader binary. Obviously, other architectures are affected
as well.
Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Ollie Wild <aaw@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Adrian Bunk <bunk@stusta.de>
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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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 = (void *)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump)));
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#endif
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dump.signal = signr;
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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);
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return retval;
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}
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current->mm->start_stack =
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(unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
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#ifdef __alpha__
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regs->gp = ex.a_gpvalue;
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#endif
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start_thread(regs, ex.a_entry, current->mm->start_stack);
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if (unlikely(current->ptrace & PT_PTRACED)) {
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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");
|