blob: 8c671f834cff4fe4f14712ce558d453ea9afbc63 [file] [log] [blame]
/*
* Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
* Licensed under the GPL
*/
#include "linux/types.h"
#include "linux/utime.h"
#include "linux/sys.h"
#include "asm/unistd.h"
#include "asm/ptrace.h"
#include "asm/uaccess.h"
#include "sysdep/syscalls.h"
#include "kern_util.h"
static inline int check_area(void *ptr, int size)
{
return(verify_area(VERIFY_WRITE, ptr, size));
}
static int check_readlink(struct pt_regs *regs)
{
return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs),
UPT_SYSCALL_ARG2(&regs->regs)));
}
static int check_utime(struct pt_regs *regs)
{
return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs),
sizeof(struct utimbuf)));
}
static int check_oldstat(struct pt_regs *regs)
{
return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs),
sizeof(struct __old_kernel_stat)));
}
static int check_stat(struct pt_regs *regs)
{
return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs),
sizeof(struct stat)));
}
static int check_stat64(struct pt_regs *regs)
{
return(check_area((void *) UPT_SYSCALL_ARG1(&regs->regs),
sizeof(struct stat64)));
}
struct bogus {
int kernel_ds;
int (*check_params)(struct pt_regs *);
};
struct bogus this_is_bogus[256] = {
[ __NR_mknod ] = { 1, NULL },
[ __NR_mkdir ] = { 1, NULL },
[ __NR_rmdir ] = { 1, NULL },
[ __NR_unlink ] = { 1, NULL },
[ __NR_symlink ] = { 1, NULL },
[ __NR_link ] = { 1, NULL },
[ __NR_rename ] = { 1, NULL },
[ __NR_umount ] = { 1, NULL },
[ __NR_mount ] = { 1, NULL },
[ __NR_pivot_root ] = { 1, NULL },
[ __NR_chdir ] = { 1, NULL },
[ __NR_chroot ] = { 1, NULL },
[ __NR_open ] = { 1, NULL },
[ __NR_quotactl ] = { 1, NULL },
[ __NR_sysfs ] = { 1, NULL },
[ __NR_readlink ] = { 1, check_readlink },
[ __NR_acct ] = { 1, NULL },
[ __NR_execve ] = { 1, NULL },
[ __NR_uselib ] = { 1, NULL },
[ __NR_statfs ] = { 1, NULL },
[ __NR_truncate ] = { 1, NULL },
[ __NR_access ] = { 1, NULL },
[ __NR_chmod ] = { 1, NULL },
[ __NR_chown ] = { 1, NULL },
[ __NR_lchown ] = { 1, NULL },
[ __NR_utime ] = { 1, check_utime },
[ __NR_oldlstat ] = { 1, check_oldstat },
[ __NR_oldstat ] = { 1, check_oldstat },
[ __NR_stat ] = { 1, check_stat },
[ __NR_lstat ] = { 1, check_stat },
[ __NR_stat64 ] = { 1, check_stat64 },
[ __NR_lstat64 ] = { 1, check_stat64 },
[ __NR_chown32 ] = { 1, NULL },
};
/* sys_utimes */
static int check_bogosity(struct pt_regs *regs)
{
struct bogus *bogon = &this_is_bogus[UPT_SYSCALL_NR(&regs->regs)];
if(!bogon->kernel_ds) return(0);
if(bogon->check_params && (*bogon->check_params)(regs))
return(-EFAULT);
set_fs(KERNEL_DS);
return(0);
}
extern syscall_handler_t *sys_call_table[];
long execute_syscall_tt(void *r)
{
struct pt_regs *regs = r;
long res;
int syscall;
current->thread.nsyscalls++;
nsyscalls++;
syscall = UPT_SYSCALL_NR(&regs->regs);
if((syscall >= NR_syscalls) || (syscall < 0))
res = -ENOSYS;
else if(honeypot && check_bogosity(regs))
res = -EFAULT;
else res = EXECUTE_SYSCALL(syscall, regs);
set_fs(USER_DS);
if(current->thread.mode.tt.singlestep_syscall){
current->thread.mode.tt.singlestep_syscall = 0;
current->ptrace &= ~PT_DTRACE;
force_sig(SIGTRAP, current);
}
return(res);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/