forked from luck/tmp_suning_uos_patched
07bf731e4b
Change syscall-stub's data to include a "expected retval". Stub now checks syscalls retval and aborts execution of syscall list, if retval != expected retval. run_syscall_stub prints the data of the failed syscall, using the data pointer and retval written by the stub to the beginning of the stack. one_syscall_stub is removed, to simplify code, because only some instructions are saved by one_syscall_stub, no host-syscall. Using the stub with additional data (modify_ldt via stub) is prepared also. Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
282 lines
8.0 KiB
C
282 lines
8.0 KiB
C
/*
|
|
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/wait.h>
|
|
#include <asm/page.h>
|
|
#include <asm/unistd.h>
|
|
#include "mem_user.h"
|
|
#include "mem.h"
|
|
#include "skas.h"
|
|
#include "user.h"
|
|
#include "os.h"
|
|
#include "proc_mm.h"
|
|
#include "ptrace_user.h"
|
|
#include "user_util.h"
|
|
#include "kern_util.h"
|
|
#include "task.h"
|
|
#include "registers.h"
|
|
#include "uml-config.h"
|
|
#include "sysdep/ptrace.h"
|
|
#include "sysdep/stub.h"
|
|
|
|
extern unsigned long batch_syscall_stub, __syscall_stub_start;
|
|
|
|
extern void wait_stub_done(int pid, int sig, char * fname);
|
|
|
|
static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
|
|
unsigned long *stack)
|
|
{
|
|
if(stack == NULL){
|
|
stack = (unsigned long *) mm_idp->stack + 2;
|
|
*stack = 0;
|
|
}
|
|
return stack;
|
|
}
|
|
|
|
extern int proc_mm;
|
|
|
|
int single_count = 0;
|
|
int multi_count = 0;
|
|
int multi_op_count = 0;
|
|
|
|
static long do_syscall_stub(struct mm_id *mm_idp, void **addr)
|
|
{
|
|
unsigned long regs[MAX_REG_NR];
|
|
unsigned long *data;
|
|
unsigned long *syscall;
|
|
long ret, offset;
|
|
int n, pid = mm_idp->u.pid;
|
|
|
|
if(proc_mm)
|
|
#warning Need to look up userspace_pid by cpu
|
|
pid = userspace_pid[0];
|
|
|
|
multi_count++;
|
|
|
|
get_safe_registers(regs);
|
|
regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
|
|
((unsigned long) &batch_syscall_stub -
|
|
(unsigned long) &__syscall_stub_start);
|
|
n = ptrace_setregs(pid, regs);
|
|
if(n < 0)
|
|
panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
|
|
n);
|
|
|
|
wait_stub_done(pid, 0, "do_syscall_stub");
|
|
|
|
/* When the stub stops, we find the following values on the
|
|
* beginning of the stack:
|
|
* (long )return_value
|
|
* (long )offset to failed sycall-data (0, if no error)
|
|
*/
|
|
ret = *((unsigned long *) mm_idp->stack);
|
|
offset = *((unsigned long *) mm_idp->stack + 1);
|
|
if (offset) {
|
|
data = (unsigned long *)(mm_idp->stack +
|
|
offset - UML_CONFIG_STUB_DATA);
|
|
syscall = (unsigned long *)((unsigned long)data + data[0]);
|
|
printk("do_syscall_stub: syscall %ld failed, return value = "
|
|
"0x%lx, expected return value = 0x%lx\n",
|
|
syscall[0], ret, syscall[7]);
|
|
printk(" syscall parameters: "
|
|
"0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
|
|
syscall[1], syscall[2], syscall[3],
|
|
syscall[4], syscall[5], syscall[6]);
|
|
for(n = 1; n < data[0]/sizeof(long); n++) {
|
|
if(n == 1)
|
|
printk(" additional syscall data:");
|
|
if(n % 4 == 1)
|
|
printk("\n ");
|
|
printk(" 0x%lx", data[n]);
|
|
}
|
|
if(n > 1)
|
|
printk("\n");
|
|
}
|
|
else ret = 0;
|
|
|
|
*addr = check_init_stack(mm_idp, NULL);
|
|
|
|
return ret;
|
|
}
|
|
|
|
long run_syscall_stub(struct mm_id * mm_idp, int syscall,
|
|
unsigned long *args, long expected, void **addr,
|
|
int done)
|
|
{
|
|
unsigned long *stack = check_init_stack(mm_idp, *addr);
|
|
|
|
if(done && *addr == NULL)
|
|
single_count++;
|
|
|
|
*stack += sizeof(long);
|
|
stack += *stack / sizeof(long);
|
|
|
|
*stack++ = syscall;
|
|
*stack++ = args[0];
|
|
*stack++ = args[1];
|
|
*stack++ = args[2];
|
|
*stack++ = args[3];
|
|
*stack++ = args[4];
|
|
*stack++ = args[5];
|
|
*stack++ = expected;
|
|
*stack = 0;
|
|
multi_op_count++;
|
|
|
|
if(!done && ((((unsigned long) stack) & ~PAGE_MASK) <
|
|
PAGE_SIZE - 10 * sizeof(long))){
|
|
*addr = stack;
|
|
return 0;
|
|
}
|
|
|
|
return do_syscall_stub(mm_idp, addr);
|
|
}
|
|
|
|
long syscall_stub_data(struct mm_id * mm_idp,
|
|
unsigned long *data, int data_count,
|
|
void **addr, void **stub_addr)
|
|
{
|
|
unsigned long *stack;
|
|
int ret = 0;
|
|
|
|
/* If *addr still is uninitialized, it *must* contain NULL.
|
|
* Thus in this case do_syscall_stub correctly won't be called.
|
|
*/
|
|
if((((unsigned long) *addr) & ~PAGE_MASK) >=
|
|
PAGE_SIZE - (10 + data_count) * sizeof(long)) {
|
|
ret = do_syscall_stub(mm_idp, addr);
|
|
/* in case of error, don't overwrite data on stack */
|
|
if(ret)
|
|
return ret;
|
|
}
|
|
|
|
stack = check_init_stack(mm_idp, *addr);
|
|
*addr = stack;
|
|
|
|
*stack = data_count * sizeof(long);
|
|
|
|
memcpy(stack + 1, data, data_count * sizeof(long));
|
|
|
|
*stub_addr = (void *)(((unsigned long)(stack + 1) & ~PAGE_MASK) +
|
|
UML_CONFIG_STUB_DATA);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len,
|
|
int r, int w, int x, int phys_fd, unsigned long long offset,
|
|
int done, void **data)
|
|
{
|
|
int prot, ret;
|
|
|
|
prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
|
|
(x ? PROT_EXEC : 0);
|
|
|
|
if(proc_mm){
|
|
struct proc_mm_op map;
|
|
int fd = mm_idp->u.mm_fd;
|
|
|
|
map = ((struct proc_mm_op) { .op = MM_MMAP,
|
|
.u =
|
|
{ .mmap =
|
|
{ .addr = virt,
|
|
.len = len,
|
|
.prot = prot,
|
|
.flags = MAP_SHARED |
|
|
MAP_FIXED,
|
|
.fd = phys_fd,
|
|
.offset= offset
|
|
} } } );
|
|
ret = os_write_file(fd, &map, sizeof(map));
|
|
if(ret != sizeof(map))
|
|
printk("map : /proc/mm map failed, err = %d\n", -ret);
|
|
else ret = 0;
|
|
}
|
|
else {
|
|
unsigned long args[] = { virt, len, prot,
|
|
MAP_SHARED | MAP_FIXED, phys_fd,
|
|
MMAP_OFFSET(offset) };
|
|
|
|
ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
|
|
data, done);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done,
|
|
void **data)
|
|
{
|
|
int ret;
|
|
|
|
if(proc_mm){
|
|
struct proc_mm_op unmap;
|
|
int fd = mm_idp->u.mm_fd;
|
|
|
|
unmap = ((struct proc_mm_op) { .op = MM_MUNMAP,
|
|
.u =
|
|
{ .munmap =
|
|
{ .addr =
|
|
(unsigned long) addr,
|
|
.len = len } } } );
|
|
ret = os_write_file(fd, &unmap, sizeof(unmap));
|
|
if(ret != sizeof(unmap))
|
|
printk("unmap - proc_mm write returned %d\n", ret);
|
|
else ret = 0;
|
|
}
|
|
else {
|
|
unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
|
|
0 };
|
|
|
|
ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
|
|
data, done);
|
|
if(ret < 0)
|
|
printk("munmap stub failed, errno = %d\n", ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
|
|
int r, int w, int x, int done, void **data)
|
|
{
|
|
struct proc_mm_op protect;
|
|
int prot, ret;
|
|
|
|
prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
|
|
(x ? PROT_EXEC : 0);
|
|
|
|
if(proc_mm){
|
|
int fd = mm_idp->u.mm_fd;
|
|
protect = ((struct proc_mm_op) { .op = MM_MPROTECT,
|
|
.u =
|
|
{ .mprotect =
|
|
{ .addr =
|
|
(unsigned long) addr,
|
|
.len = len,
|
|
.prot = prot } } } );
|
|
|
|
ret = os_write_file(fd, &protect, sizeof(protect));
|
|
if(ret != sizeof(protect))
|
|
printk("protect failed, err = %d", -ret);
|
|
else ret = 0;
|
|
}
|
|
else {
|
|
unsigned long args[] = { addr, len, prot, 0, 0, 0 };
|
|
|
|
ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
|
|
data, done);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void before_mem_skas(unsigned long unused)
|
|
{
|
|
}
|