On Mon, Jul 21, 2003 at 01:57:59AM +0200, Pawel Jakub Dawidek wrote:
+ So as you can see I'm listing every entry that isn't writable.
+ This function is called when process is killed by kernel with SIGBUS.
+ It shows me that only this region isn't writable:
+
+ ENTRY:PID: 0-0xbfc0 (0:0)
Hmm. Is the VM object properly sized? Any attempt to fault-in data
beyond a VM object's EOF, regardless of how you set the map_entry
permissions, will seg fault or bus fault.
-Matt
Matthew Dillon
On Mon, Jul 21, 2003 at 12:03:59PM -0700, Matthew Dillon wrote:
+ Hmm. Is the VM object properly sized? Any attempt to fault-in data
+ beyond a VM object's EOF, regardless of how you set the map_entry
+ permissions, will seg fault or bus fault.
I'm allocationg memory with obreak()
: end =3D vm-vm_daddr + ctob(vm-vm_dsize);
: obreak(vm, end + size);
: vm_map_protect(vm-vm_map, end, end + size, VM_PROT_READ);
:
:And vm_map_protect() will create new map entry (it should, right?)
:with entry-start =3D end and entry-end =3D end + size.
:
:But what happend with
Hi Pawel,
On Mon, Jul 21, 2003 at 09:16:22PM +0200, Pawel Jakub Dawidek wrote:
I'm allocationg memory with obreak() function (so vm_map_find() function
is used to find space). But if I try to allocate size (and size is small),
obreak() will allocate more memory.
You may find the vm_map and
On Mon, Jul 21, 2003 at 12:32:19PM -0700, Matthew Dillon wrote:
+ Hmm. Well, when a process forks the vm_map_entry's fork along with
+ it. The underlying VM objects remain shared but become copy-on-write.
Yes, but I mean while execve(), not fork().
Before execve() is called map got for
On Mon, Jul 21, 2003 at 08:51:19PM +0100, Bruce M Simpson wrote:
Matt, Bruce, thanks!
I've track it down.
Yes, those read-only pages was reused. So now I'm putting them on list
before syscall is called, and after syscall is executed I free memory
for non-execve syscalls and mark entries from
Hello hackers...
I'll try to describe my problem carefully, maybe there will be someone
who will be able to help me with this.
Problem: Strage 'Bus errors'.
What I'm doing?
I allocate memory in process' vmspace with my version of obreak function.
It is quite simlar to those from
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