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/*
* a.out loader for x86-64
*
* Copyright (C) 1991, 1992, 1996 Linus Torvalds
* Hacked together by Andi Kleen
*/
#include <linux/module.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/a.out.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/binfmts.h>
#include <linux/personality.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/perf_event.h>
#include <linux/sched/task_stack.h>
#include <linux/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/cacheflush.h>
#include <asm/user32.h>
#include <asm/ia32.h>
#undef WARN_OLD
static int load_aout_binary(struct linux_binprm *);
static int load_aout_library(struct file *);
#ifdef CONFIG_COREDUMP
static int aout_core_dump(struct coredump_params *);
static unsigned long get_dr(int n)
{
struct perf_event *bp = current->thread.ptrace_bps[n];
return bp ? bp->hw.info.address : 0;
}
/*
* fill in the user structure for a core dump..
*/
static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
{
u32 fs, gs;
memset(dump, 0, sizeof(*dump));
/* changed the size calculations - should hopefully work better. lbt */
dump->magic = CMAGIC;
dump->start_code = 0;
dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
dump->u_dsize = ((unsigned long)
(current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
dump->u_dsize -= dump->u_tsize;
dump->u_debugreg[0] = get_dr(0);
dump->u_debugreg[1] = get_dr(1);
dump->u_debugreg[2] = get_dr(2);
dump->u_debugreg[3] = get_dr(3);
dump->u_debugreg[6] = current->thread.debugreg6;
dump->u_debugreg[7] = current->thread.ptrace_dr7;
if (dump->start_stack < 0xc0000000) {
unsigned long tmp;
tmp = (unsigned long) (0xc0000000 - dump->start_stack);
dump->u_ssize = tmp >> PAGE_SHIFT;
}
dump->regs.ebx = regs->bx;
dump->regs.ecx = regs->cx;
dump->regs.edx = regs->dx;
dump->regs.esi = regs->si;
dump->regs.edi = regs->di;
dump->regs.ebp = regs->bp;
dump->regs.eax = regs->ax;
dump->regs.ds = current->thread.ds;
dump->regs.es = current->thread.es;
savesegment(fs, fs);
dump->regs.fs = fs;
savesegment(gs, gs);
dump->regs.gs = gs;
dump->regs.orig_eax = regs->orig_ax;
dump->regs.eip = regs->ip;
dump->regs.cs = regs->cs;
dump->regs.eflags = regs->flags;
dump->regs.esp = regs->sp;
dump->regs.ss = regs->ss;
#if 1 /* FIXME */
dump->u_fpvalid = 0;
#else
dump->u_fpvalid = dump_fpu(regs, &dump->i387);
#endif
}
#endif
static struct linux_binfmt aout_format = {
.module = THIS_MODULE,
.load_binary = load_aout_binary,
.load_shlib = load_aout_library,
#ifdef CONFIG_COREDUMP
.core_dump = aout_core_dump,
#endif
.min_coredump = PAGE_SIZE
};
static int set_brk(unsigned long start, unsigned long end)
{
start = PAGE_ALIGN(start);
end = PAGE_ALIGN(end);
if (end <= start)
return 0;
return vm_brk(start, end - start);
}
#ifdef CONFIG_COREDUMP
/*
* These are the only things you should do on a core-file: use only these
* macros to write out all the necessary info.
*/
#include <linux/coredump.h>
#define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
#define START_STACK(u) (u.start_stack)
/*
* Routine writes a core dump image in the current directory.
* Currently only a stub-function.
*
* Note that setuid/setgid files won't make a core-dump if the uid/gid
* changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
* field, which also makes sure the core-dumps won't be recursive if the
* dumping of the process results in another error..
*/
static int aout_core_dump(struct coredump_params *cprm)
{
mm_segment_t fs;
int has_dumped = 0;
unsigned long dump_start, dump_size;
struct user32 dump;
fs = get_fs();
set_fs(KERNEL_DS);
has_dumped = 1;
strncpy(dump.u_comm, current->comm, sizeof(current->comm));
dump.u_ar0 = offsetof(struct user32, regs);
dump.signal = cprm->siginfo->si_signo;
dump_thread32(cprm->regs, &dump);
/*
* If the size of the dump file exceeds the rlimit, then see
* what would happen if we wrote the stack, but not the data
* area.
*/
if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
dump.u_dsize = 0;
/* Make sure we have enough room to write the stack and data areas. */
if ((dump.u_ssize + 1) * PAGE_SIZE > cprm->limit)
dump.u_ssize = 0;
/* make sure we actually have a data and stack area to dump */
set_fs(USER_DS);
if (!access_ok((void *) (unsigned long)START_DATA(dump),
dump.u_dsize << PAGE_SHIFT))
dump.u_dsize = 0;
if (!access_ok((void *) (unsigned long)START_STACK(dump),
dump.u_ssize << PAGE_SHIFT))
dump.u_ssize = 0;
set_fs(KERNEL_DS);
/* struct user */
if (!dump_emit(cprm, &dump, sizeof(dump)))
goto end_coredump;
/* Now dump all of the user data. Include malloced stuff as well */
if (!dump_skip(cprm, PAGE_SIZE - sizeof(dump)))
goto end_coredump;
/* now we start writing out the user space info */
set_fs(USER_DS);
/* Dump the data area */
if (dump.u_dsize != 0) {
dump_start = START_DATA(dump);
dump_size = dump.u_dsize << PAGE_SHIFT;
if (!dump_emit(cprm, (void *)dump_start, dump_size))
goto end_coredump;
}
/* Now prepare to dump the stack area */
if (dump.u_ssize != 0) {
dump_start = START_STACK(dump);
dump_size = dump.u_ssize << PAGE_SHIFT;
if (!dump_emit(cprm, (void *)dump_start, dump_size))
goto end_coredump;
}
end_coredump:
set_fs(fs);
return has_dumped;
}
#endif
/*
* create_aout_tables() parses the env- and arg-strings in new user
* memory and creates the pointer tables from them, and puts their
* addresses on the "stack", returning the new stack pointer value.
*/
static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
{
u32 __user *argv, *envp, *sp;
int argc = bprm->argc, envc = bprm->envc;
sp = (u32 __user *) ((-(unsigned long)sizeof(u32))
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