Commit 07bf731e authored by Bodo Stroesser's avatar Bodo Stroesser Committed by Linus Torvalds
Browse files

[PATCH] uml: skas0 stubs now check system call return values 



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: default avatarBodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: default avatarJeff Dike <jdike@addtoit.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8b51304e

arch/um/include/tlb.h

+3 −3
Original line number Diff line number Diff line
@@ -38,9 +38,9 @@ extern void mprotect_kernel_vm(int w); 
extern void force_flush_all(void);

extern void fix_range_common(struct mm_struct *mm, unsigned long start_addr,

                             unsigned long end_addr, int force,

			     void *(*do_ops)(union mm_context *,

			     int (*do_ops)(union mm_context *,

					   struct host_vm_op *, int, int,

					     void *));

					   void **));

extern int flush_tlb_kernel_range_common(unsigned long start,

					 unsigned long end);

arch/um/kernel/skas/include/skas.h

+14 −19
Original line number Diff line number Diff line
@@ -24,14 +24,14 @@ extern void new_thread_proc(void *stack, void (*handler)(int sig)); 
extern void remove_sigstack(void);

extern void new_thread_handler(int sig);

extern void handle_syscall(union uml_pt_regs *regs);

extern void *map(struct mm_id * mm_idp, unsigned long virt,

extern 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);

extern void *unmap(struct mm_id * mm_idp, void *addr,

		   unsigned long len, int done, void *data);

extern void *protect(struct mm_id * mm_idp, unsigned long addr,

	       unsigned long long offset, int done, void **data);

extern int unmap(struct mm_id * mm_idp, void *addr, unsigned long len,

		 int done, void **data);

extern int protect(struct mm_id * mm_idp, unsigned long addr,

		   unsigned long len, int r, int w, int x, int done,

		     void *data);

		   void **data);

extern void user_signal(int sig, union uml_pt_regs *regs, int pid);

extern int new_mm(int from, unsigned long stack);

extern int start_userspace(unsigned long stub_stack);
@@ -39,16 +39,11 @@ extern int copy_context_skas0(unsigned long stack, int pid); 
extern void get_skas_faultinfo(int pid, struct faultinfo * fi);

extern long execute_syscall_skas(void *r);

extern unsigned long current_stub_stack(void);

extern long run_syscall_stub(struct mm_id * mm_idp,

                             int syscall, unsigned long *args, long expected,

                             void **addr, int done);

extern long syscall_stub_data(struct mm_id * mm_idp,

                              unsigned long *data, int data_count,

                              void **addr, void **stub_addr);



#endif
 


/*

 * 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:

 */

arch/um/kernel/skas/mem_user.c

+138 −96
Original line number Diff line number Diff line
@@ -5,13 +5,14 @@ 


#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 "mm_id.h"

#include "skas.h"

#include "user.h"

#include "os.h"

#include "proc_mm.h"
@@ -23,56 +24,99 @@ 
#include "uml-config.h"

#include "sysdep/ptrace.h"

#include "sysdep/stub.h"

#include "skas.h"



extern unsigned long syscall_stub, batch_syscall_stub, __syscall_stub_start;

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 one_syscall_stub(struct mm_id * mm_idp, int syscall,

			     unsigned long *args)

static long do_syscall_stub(struct mm_id *mm_idp, void **addr)

{

        int n, pid = mm_idp->u.pid;

	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) &syscall_stub -

		((unsigned long) &batch_syscall_stub -

                 (unsigned long) &__syscall_stub_start);

        /* XXX Don't have a define for starting a syscall */

        regs[REGS_SYSCALL_NR] = syscall;

        regs[REGS_SYSCALL_ARG1] = args[0];

        regs[REGS_SYSCALL_ARG2] = args[1];

        regs[REGS_SYSCALL_ARG3] = args[2];

        regs[REGS_SYSCALL_ARG4] = args[3];

        regs[REGS_SYSCALL_ARG5] = args[4];

        regs[REGS_SYSCALL_ARG6] = args[5];

	n = ptrace_setregs(pid, regs);

        if(n < 0){

		printk("one_syscall_stub : PTRACE_SETREGS failed, "

		       "errno = %d\n", n);

		return(n);

	}

	if(n < 0)

		panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",

		      n);



	wait_stub_done(pid, 0, "one_syscall_stub");

	wait_stub_done(pid, 0, "do_syscall_stub");



	return(*((unsigned long *) mm_idp->stack));

	/* 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;



int multi_count = 0;

int multi_op_count = 0;

	*addr = check_init_stack(mm_idp, NULL);



	return ret;

}



static long many_syscall_stub(struct mm_id * mm_idp, int syscall,

			      unsigned long *args, int done, void **addr_out)

long run_syscall_stub(struct mm_id * mm_idp, int syscall,

		      unsigned long *args, long expected, void **addr,

 		      int done)

{

        unsigned long regs[MAX_REG_NR], *stack;

        int n, pid = mm_idp->u.pid;

 	unsigned long *stack = check_init_stack(mm_idp, *addr);



	if(done && *addr == NULL)

		single_count++;



 	*stack += sizeof(long);

	stack += *stack / sizeof(long);



        stack = *addr_out;

        if(stack == NULL)

                stack = (unsigned long *) current_stub_stack();

        *stack++ = syscall;

        *stack++ = args[0];

        *stack++ = args[1];
@@ -80,53 +124,55 @@ static long many_syscall_stub(struct mm_id * mm_idp, int syscall, 
        *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 - 8 * sizeof(long))){

                *addr_out = stack;

		     PAGE_SIZE - 10 * sizeof(long))){

		*addr = stack;

                return 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);

        regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA;



        n = ptrace_setregs(pid, regs);

        if(n < 0){

                printk("many_syscall_stub : PTRACE_SETREGS failed, "

                       "errno = %d\n", n);

                return(n);

	return do_syscall_stub(mm_idp, addr);

}



        wait_stub_done(pid, 0, "many_syscall_stub");

        stack = (unsigned long *) mm_idp->stack;

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;



        *addr_out = stack;

        return(*stack);

	/* 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;

	}



static long run_syscall_stub(struct mm_id * mm_idp, int syscall,

                             unsigned long *args, void **addr, int done)

{

        long res;

	stack = check_init_stack(mm_idp, *addr);

	*addr = stack;



	*stack = data_count * sizeof(long);



        if((*addr == NULL) && done)

                res = one_syscall_stub(mm_idp, syscall, args);

        else res = many_syscall_stub(mm_idp, syscall, args, done, addr);

	memcpy(stack + 1, data, data_count * sizeof(long));



        return res;

	*stub_addr = (void *)(((unsigned long)(stack + 1) & ~PAGE_MASK) +

			      UML_CONFIG_STUB_DATA);



	return 0;

}



void *map(struct mm_id * mm_idp, unsigned long virt, unsigned long len,

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 done, void **data)

{

        int prot, n;

        int prot, ret;



        prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |

                (x ? PROT_EXEC : 0);
@@ -146,29 +192,27 @@ void *map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, 
                                                 .fd	= phys_fd,

                                                 .offset= offset

                                               } } } );

                n = os_write_file(fd, &map, sizeof(map));

                if(n != sizeof(map))

                        printk("map : /proc/mm map failed, err = %d\n", -n);

		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 {

                long res;

                unsigned long args[] = { virt, len, prot,

                                         MAP_SHARED | MAP_FIXED, phys_fd,

                                         MMAP_OFFSET(offset) };



		res = run_syscall_stub(mm_idp, STUB_MMAP_NR, args,

				       &data, done);

                if((void *) res == MAP_FAILED)

                        printk("mmap stub failed, errno = %d\n", res);

		ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,

				       data, done);

        }



	return data;

	return ret;

}



void *unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done,

            void *data)

int unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done,

	  void **data)

{

        int n;

        int ret;



        if(proc_mm){

                struct proc_mm_op unmap;
@@ -180,29 +224,29 @@ void *unmap(struct mm_id * mm_idp, void *addr, unsigned long len, int done, 
                                                 { .addr	=

                                                   (unsigned long) addr,

                                                   .len		= len } } } );

                n = os_write_file(fd, &unmap, sizeof(unmap));

		if(n != sizeof(unmap))

		  printk("unmap - proc_mm write returned %d\n", n);

		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 {

                int res;

                unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,

                                         0 };



		res = run_syscall_stub(mm_idp, __NR_munmap, args,

				       &data, done);

                if(res < 0)

                        printk("munmap stub failed, errno = %d\n", res);

		ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,

				       data, done);

                if(ret < 0)

                        printk("munmap stub failed, errno = %d\n", ret);

        }



        return data;

        return ret;

}



void *protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,

              int r, int w, int x, int done, void *data)

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, n;

        int prot, ret;



        prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |

                (x ? PROT_EXEC : 0);
@@ -217,21 +261,19 @@ void *protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len, 
                                                     .len	= len,

                                                     .prot	= prot } } } );



                n = os_write_file(fd, &protect, sizeof(protect));

                if(n != sizeof(protect))

                        panic("protect failed, err = %d", -n);

                ret = os_write_file(fd, &protect, sizeof(protect));

                if(ret != sizeof(protect))

                        printk("protect failed, err = %d", -ret);

                else ret = 0;

        }

        else {

                int res;

                unsigned long args[] = { addr, len, prot, 0, 0, 0 };



                res = run_syscall_stub(mm_idp, __NR_mprotect, args,

                                       &data, done);

                if(res < 0)

                        panic("mprotect stub failed, errno = %d\n", res);

                ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,

                                       data, done);

        }



        return data;

        return ret;

}



void before_mem_skas(unsigned long unused)

arch/um/kernel/skas/tlb.c

+16 −15
Original line number Diff line number Diff line
@@ -18,27 +18,28 @@ 
#include "os.h"

#include "tlb.h"



static void *do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,

		    int finished, void *flush)

static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,

		  int finished, void **flush)

{

	struct host_vm_op *op;

	int i;

        int i, ret = 0;



	for(i = 0; i <= last; i++){

        for(i = 0; i <= last && !ret; i++){

		op = &ops[i];

		switch(op->type){

		case MMAP:

			flush = map(&mmu->skas.id, op->u.mmap.addr,

			ret = map(&mmu->skas.id, op->u.mmap.addr,

				  op->u.mmap.len, op->u.mmap.r, op->u.mmap.w,

				  op->u.mmap.x, op->u.mmap.fd,

				  op->u.mmap.offset, finished, flush);

			break;

		case MUNMAP:

			flush = unmap(&mmu->skas.id, (void *) op->u.munmap.addr,

			ret = unmap(&mmu->skas.id,

				    (void *) op->u.munmap.addr,

				    op->u.munmap.len, finished, flush);

			break;

		case MPROTECT:

			flush = protect(&mmu->skas.id, op->u.mprotect.addr,

			ret = protect(&mmu->skas.id, op->u.mprotect.addr,

				      op->u.mprotect.len, op->u.mprotect.r,

				      op->u.mprotect.w, op->u.mprotect.x,

				      finished, flush);
@@ -49,7 +50,7 @@ static void *do_ops(union mm_context *mmu, struct host_vm_op *ops, int last, 
		}

	}



	return flush;

	return ret;

}



extern int proc_mm;

arch/um/kernel/tlb.c

+87 −76
Original line number Diff line number Diff line
@@ -16,34 +16,34 @@ 
#include "os.h"



static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,

		    int r, int w, int x, struct host_vm_op *ops, int index,

 		    int r, int w, int x, struct host_vm_op *ops, int *index,

		    int last_filled, union mm_context *mmu, void **flush,

		    void *(*do_ops)(union mm_context *, struct host_vm_op *,

				    int, int, void *))

		    int (*do_ops)(union mm_context *, struct host_vm_op *,

				  int, int, void **))

{

        __u64 offset;

	struct host_vm_op *last;

	int fd;

	int fd, ret = 0;



	fd = phys_mapping(phys, &offset);

	if(index != -1){

		last = &ops[index];

	if(*index != -1){

		last = &ops[*index];

		if((last->type == MMAP) &&

		   (last->u.mmap.addr + last->u.mmap.len == virt) &&

		   (last->u.mmap.r == r) && (last->u.mmap.w == w) &&

		   (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&

		   (last->u.mmap.offset + last->u.mmap.len == offset)){

			last->u.mmap.len += len;

			return index;

			return 0;

		}

	}



	if(index == last_filled){

		*flush = (*do_ops)(mmu, ops, last_filled, 0, *flush);

		index = -1;

	if(*index == last_filled){

		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);

		*index = -1;

	}



	ops[++index] = ((struct host_vm_op) { .type	= MMAP,

	ops[++*index] = ((struct host_vm_op) { .type	= MMAP,

			     			.u = { .mmap = {

						       .addr	= virt,

						       .len	= len,
@@ -53,78 +53,80 @@ static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len, 
						       .fd	= fd,

						       .offset	= offset }

			   } });

	return index;

	return ret;

}



static int add_munmap(unsigned long addr, unsigned long len,

		      struct host_vm_op *ops, int index, int last_filled,

		      struct host_vm_op *ops, int *index, int last_filled,

		      union mm_context *mmu, void **flush,

		      void *(*do_ops)(union mm_context *, struct host_vm_op *,

				      int, int, void *))

		      int (*do_ops)(union mm_context *, struct host_vm_op *,

				    int, int, void **))

{

	struct host_vm_op *last;

	int ret = 0;



	if(index != -1){

		last = &ops[index];

	if(*index != -1){

		last = &ops[*index];

		if((last->type == MUNMAP) &&

		   (last->u.munmap.addr + last->u.mmap.len == addr)){

			last->u.munmap.len += len;

			return index;

			return 0;

		}

	}



	if(index == last_filled){

		*flush = (*do_ops)(mmu, ops, last_filled, 0, *flush);

		index = -1;

	if(*index == last_filled){

		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);

		*index = -1;

	}



	ops[++index] = ((struct host_vm_op) { .type	= MUNMAP,

	ops[++*index] = ((struct host_vm_op) { .type	= MUNMAP,

			     		       .u = { .munmap = {

						        .addr	= addr,

							.len	= len } } });

	return index;

	return ret;

}



static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,

			int x, struct host_vm_op *ops, int index,

			int x, struct host_vm_op *ops, int *index,

			int last_filled, union mm_context *mmu, void **flush,

			void *(*do_ops)(union mm_context *,

				       struct host_vm_op *, int, int, void *))

 			int (*do_ops)(union mm_context *, struct host_vm_op *,

				      int, int, void **))

{

	struct host_vm_op *last;

	int ret = 0;



	if(index != -1){

		last = &ops[index];

	if(*index != -1){

		last = &ops[*index];

		if((last->type == MPROTECT) &&

		   (last->u.mprotect.addr + last->u.mprotect.len == addr) &&

		   (last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&

		   (last->u.mprotect.x == x)){

			last->u.mprotect.len += len;

			return index;

			return 0;

		}

	}



	if(index == last_filled){

		*flush = (*do_ops)(mmu, ops, last_filled, 0, *flush);

		index = -1;

	if(*index == last_filled){

		ret = (*do_ops)(mmu, ops, last_filled, 0, flush);

		*index = -1;

	}



	ops[++index] = ((struct host_vm_op) { .type	= MPROTECT,

	ops[++*index] = ((struct host_vm_op) { .type	= MPROTECT,

			     		       .u = { .mprotect = {

						       .addr	= addr,

						       .len	= len,

						       .r	= r,

						       .w	= w,

						       .x	= x } } });

	return index;

	return ret;

}



#define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1))



void fix_range_common(struct mm_struct *mm, unsigned long start_addr,

                      unsigned long end_addr, int force,

		      void *(*do_ops)(union mm_context *, struct host_vm_op *,

				      int, int, void *))

		      int (*do_ops)(union mm_context *, struct host_vm_op *,

				    int, int, void **))

{

        pgd_t *npgd;

        pud_t *npud;
@@ -136,19 +138,20 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr, 
        struct host_vm_op ops[1];

        void *flush = NULL;

        int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1;

        int ret = 0;



        if(mm == NULL) return;



        ops[0].type = NONE;

        for(addr = start_addr; addr < end_addr;){

        for(addr = start_addr; addr < end_addr && !ret;){

                npgd = pgd_offset(mm, addr);

                if(!pgd_present(*npgd)){

                        end = ADD_ROUND(addr, PGDIR_SIZE);

                        if(end > end_addr)

                                end = end_addr;

                        if(force || pgd_newpage(*npgd)){

                                op_index = add_munmap(addr, end - addr, ops,

                                                      op_index, last_op, mmu,

                                ret = add_munmap(addr, end - addr, ops,

                                                 &op_index, last_op, mmu,

                                                 &flush, do_ops);

                                pgd_mkuptodate(*npgd);

                        }
@@ -162,8 +165,8 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr, 
                        if(end > end_addr)

                                end = end_addr;

                        if(force || pud_newpage(*npud)){

                                op_index = add_munmap(addr, end - addr, ops,

                                                      op_index, last_op, mmu,

                                ret = add_munmap(addr, end - addr, ops,

                                                 &op_index, last_op, mmu,

                                                 &flush, do_ops);

                                pud_mkuptodate(*npud);

                        }
@@ -177,8 +180,8 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr, 
                        if(end > end_addr)

                                end = end_addr;

                        if(force || pmd_newpage(*npmd)){

                                op_index = add_munmap(addr, end - addr, ops,

                                                      op_index, last_op, mmu,

                                ret = add_munmap(addr, end - addr, ops,

                                                 &op_index, last_op, mmu,

                                                 &flush, do_ops);

                                pmd_mkuptodate(*npmd);

                        }
@@ -198,24 +201,32 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr, 
                }

                if(force || pte_newpage(*npte)){

                        if(pte_present(*npte))

                                op_index = add_mmap(addr,

			  ret = add_mmap(addr,

					 pte_val(*npte) & PAGE_MASK,

					 PAGE_SIZE, r, w, x, ops,

                                                    op_index, last_op, mmu,

					 &op_index, last_op, mmu,

					 &flush, do_ops);

                        else op_index = add_munmap(addr, PAGE_SIZE, ops,

                                                   op_index, last_op, mmu,

			else ret = add_munmap(addr, PAGE_SIZE, ops,

					      &op_index, last_op, mmu,

					      &flush, do_ops);

                }

                else if(pte_newprot(*npte))

                        op_index = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,

                                                op_index, last_op, mmu,

			ret = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,

					   &op_index, last_op, mmu,

					   &flush, do_ops);



                *npte = pte_mkuptodate(*npte);

                addr += PAGE_SIZE;

        }

	flush = (*do_ops)(mmu, ops, op_index, 1, flush);



	if(!ret)

		ret = (*do_ops)(mmu, ops, op_index, 1, &flush);



	/* This is not an else because ret is modified above */

	if(ret) {

		printk("fix_range_common: failed, killing current process\n");

		force_sig(SIGKILL, current);

	}

}



int flush_tlb_kernel_range_common(unsigned long start, unsigned long end)

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