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Added new routines that map and check the validity of user buffers.

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mmap uses this mechanism to get arguments. It needs to be tested.
This commit is contained in:
Bahadir Balban
2008-11-03 11:27:10 +02:00
parent 87d1b91743
commit ca8959eee0
11 changed files with 131 additions and 59 deletions
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13
tasks/mm0/src/file.c
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@@ -15,6 +15,7 @@
#include <string.h>
#include <globals.h>
#include <file.h>
#include <user.h>
/* Copy from one page's buffer into another page */
int page_copy(struct page *dst, struct page *src,
@@ -613,10 +614,10 @@ int sys_read(struct tcb *task, int fd, void *buf, int count)
return 0;
/* Check user buffer validity. */
if ((ret = validate_task_range(task, (unsigned long)buf,
if ((ret = pager_validate_user_range(task, buf,
(unsigned long)(buf + count),
VM_READ)) < 0)
return ret;
return -EFAULT;
vmfile = task->files->fd[fd].vmfile;
cursor = task->files->fd[fd].cursor;
@@ -683,10 +684,10 @@ int sys_write(struct tcb *task, int fd, void *buf, int count)
/* Check user buffer validity. */
if ((ret = validate_task_range(task, (unsigned long)buf,
(unsigned long)(buf + count),
VM_WRITE | VM_READ)) < 0)
return ret;
if ((ret = pager_validate_user_range(task, buf,
(unsigned long)(buf + count),
VM_WRITE | VM_READ)) < 0)
return -EINVAL;
vmfile = task->files->fd[fd].vmfile;
cursor = task->files->fd[fd].cursor;