From: Ben Gras <ben@minix3.org>
Date: Mon, 8 Jun 2009 14:33:15 +0000 (+0000)
Subject: quick hack (sorry) for making *sdevio* work to other
X-Git-Tag: v3.1.4~2
X-Git-Url: http://zhaoyanbai.com/repos/man.arpaname.html?a=commitdiff_plain;h=01732ffb5e50862f780f1df22808888db91b7bc5;p=minix.git

quick hack (sorry) for making *sdevio* work to other
processes than the caller..

also disable kernel sanity checks
---

diff --git a/kernel/arch/i386/do_sdevio.c b/kernel/arch/i386/do_sdevio.c
index 9d0829a3a..65bfd7e49 100644
--- a/kernel/arch/i386/do_sdevio.c
+++ b/kernel/arch/i386/do_sdevio.c
@@ -32,6 +32,10 @@ register message *m_ptr;	/* pointer to request message */
   struct proc *rp;
   struct priv *privp;
   struct io_range *iorp;
+  int rem;
+  static char zero[4096];
+  vir_bytes addr;
+  struct proc *destproc;
 
   /* Allow safe copies and accesses to SELF */
   if ((m_ptr->DIO_REQUEST & _DIO_SAFEMASK) != _DIO_SAFE &&
@@ -63,12 +67,26 @@ register message *m_ptr;	/* pointer to request message */
 
   /* Check for 'safe' variants. */
   if((m_ptr->DIO_REQUEST & _DIO_SAFEMASK) == _DIO_SAFE) {
+     vir_bytes newoffset;
+     endpoint_t newep;
      /* Map grant address to physical address. */
-     if ((phys_buf = umap_verify_grant(proc_addr(proc_nr), who_e,
+     if(verify_grant(proc_nr_e, who_e, 
 	(vir_bytes) m_ptr->DIO_VEC_ADDR,
-	(vir_bytes) m_ptr->DIO_OFFSET, count,
-	req_dir == _DIO_INPUT ? CPF_WRITE : CPF_READ)) == 0)
-         return(EPERM);
+	count,
+	req_dir == _DIO_INPUT ? CPF_WRITE : CPF_READ,
+	(vir_bytes) m_ptr->DIO_OFFSET, 
+	&newoffset, &newep) != OK) {
+	printf("do_sdevio: verify_grant failed\n");
+	return EPERM;
+    }
+	if(!isokendpt(newep, &proc_nr))
+		return(EINVAL);
+     destproc = proc_addr(proc_nr);
+     if ((phys_buf = umap_local(destproc, D,
+	 (vir_bytes) newoffset, count)) == 0) {
+	printf("do_sdevio: umap_local failed\n");
+         return(EFAULT);
+     }
   } else {
      if(proc_nr != who_p)
      {
@@ -80,12 +98,24 @@ register message *m_ptr;	/* pointer to request message */
      if ((phys_buf = umap_local(proc_addr(proc_nr), D,
 	 (vir_bytes) m_ptr->DIO_VEC_ADDR, count)) == 0)
          return(EFAULT);
+     destproc = proc_addr(proc_nr);
   }
      /* current process must be target for phys_* to be OK */
-     if(proc_addr(proc_nr) != ptproc) {
-	kprintf("do_sdevio: wrong process\n");
-	return EIO;
-     }
+
+  vm_set_cr3(destproc);
+  rem = count;
+  addr = m_ptr->DIO_VEC_ADDR;
+  while(rem > 0) {
+	int r;
+	int chunk;
+	chunk = rem > sizeof(zero) ? sizeof(zero) : rem;
+	if((r=data_copy_vmcheck(SYSTEM, zero, destproc->p_endpoint, 
+		 addr, chunk)) != OK) {
+			return r;
+	}
+	addr += chunk;
+	rem -= chunk;
+  }
 
 	switch (io_type)
 	{
diff --git a/kernel/arch/i386/memory.c b/kernel/arch/i386/memory.c
index 37b88447d..9aa6ec66c 100644
--- a/kernel/arch/i386/memory.c
+++ b/kernel/arch/i386/memory.c
@@ -37,7 +37,6 @@ PUBLIC u32_t dirtypde;
 #define HASPT(procptr) ((procptr)->p_seg.p_cr3 != 0)
 
 FORWARD _PROTOTYPE( u32_t phys_get32, (vir_bytes v)			);
-FORWARD _PROTOTYPE( void vm_set_cr3, (struct proc *pr)			);
 FORWARD _PROTOTYPE( void set_cr3, (void)				);
 FORWARD _PROTOTYPE( void vm_enable_paging, (void)			);
 
@@ -212,7 +211,7 @@ phys_bytes addr;
 
 PRIVATE u32_t vm_cr3;	/* temp arg to level0() func */
 
-PRIVATE void vm_set_cr3(struct proc *newptproc)
+PUBLIC void vm_set_cr3(struct proc *newptproc)
 {
 	int u = 0;
 	if(!intr_disabled()) { lock; u = 1; }
diff --git a/kernel/arch/i386/proto.h b/kernel/arch/i386/proto.h
index 0dfb478c9..45fee754a 100644
--- a/kernel/arch/i386/proto.h
+++ b/kernel/arch/i386/proto.h
@@ -53,6 +53,7 @@ _PROTOTYPE( void i386_updatepde, (int pde, u32_t val));
 _PROTOTYPE( void i386_freepde, (int pde));
 _PROTOTYPE( void getcr3val, (void));
 _PROTOTYPE( void switchedcr3, (void));
+_PROTOTYPE( void vm_set_cr3, (struct proc *));
 
 
 /* exception.c */
diff --git a/kernel/debug.h b/kernel/debug.h
index baa044834..e25605e0c 100644
--- a/kernel/debug.h
+++ b/kernel/debug.h
@@ -25,10 +25,10 @@
 #define DEBUG_TIME_LOCKS		1
 
 /* Runtime sanity checking. */
-#define DEBUG_VMASSERT			1
-#define DEBUG_SCHED_CHECK		1
-#define DEBUG_STACK_CHECK		1
-#define DEBUG_TRACE			1
+#define DEBUG_VMASSERT			0
+#define DEBUG_SCHED_CHECK		0
+#define DEBUG_STACK_CHECK		0
+#define DEBUG_TRACE			0
 
 #if DEBUG_TRACE