* Oleg Nesterov [2012-07-28 18:31:57]:
> https://bugzilla.redhat.com/show_bug.cgi?id=843640
>
> If mmap_region()->uprobe_mmap() fails, unmap_and_free_vma path
> does unmap_region() but does not remove the soon-to-be-freed vma
> from rb tree (actually there are more problems).
>
> Perhaps we
* Oleg Nesterov o...@redhat.com [2012-07-28 18:31:57]:
https://bugzilla.redhat.com/show_bug.cgi?id=843640
If mmap_region()-uprobe_mmap() fails, unmap_and_free_vma path
does unmap_region() but does not remove the soon-to-be-freed vma
from rb tree (actually there are more problems).
On 07/31, Oleg Nesterov wrote:
>
> OK, so what you suggest for now?
>
> Please note that it is very trivial to crash the kernel. Just
> do something like
>
> echo "p /bin/true:OFFSET_OF_SYSCALL_INSN" >
> /sys/kernel/debug/tracing/uprobe_events
> /bin/true
Forgot to mention...
And
On 07/31, Srikar Dronamraju wrote:
>
> > --- a/kernel/fork.c
> > +++ b/kernel/fork.c
> > @@ -454,8 +454,8 @@ static int dup_mmap(struct mm_struct *mm, struct
> > mm_struct *oldmm)
> > if (retval)
> > goto out;
> >
> > - if (file && uprobe_mmap(tmp))
> > -
>
> If mmap_region()->uprobe_mmap() fails, unmap_and_free_vma path
> does unmap_region() but does not remove the soon-to-be-freed vma
> from rb tree (actually there are more problems).
>
> Perhaps we could do do_munmap() + return in this case, but in fact
> it is simply wrong to abort if
If mmap_region()-uprobe_mmap() fails, unmap_and_free_vma path
does unmap_region() but does not remove the soon-to-be-freed vma
from rb tree (actually there are more problems).
Perhaps we could do do_munmap() + return in this case, but in fact
it is simply wrong to abort if uprobe_mmap()
On 07/31, Srikar Dronamraju wrote:
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -454,8 +454,8 @@ static int dup_mmap(struct mm_struct *mm, struct
mm_struct *oldmm)
if (retval)
goto out;
- if (file uprobe_mmap(tmp))
-
On 07/31, Oleg Nesterov wrote:
OK, so what you suggest for now?
Please note that it is very trivial to crash the kernel. Just
do something like
echo p /bin/true:OFFSET_OF_SYSCALL_INSN
/sys/kernel/debug/tracing/uprobe_events
/bin/true
Forgot to mention...
And even it it
On 07/28/2012 12:31 PM, Oleg Nesterov wrote:
> https://bugzilla.redhat.com/show_bug.cgi?id=843640
Hi Oleg,
I checked the following patch and it does fix the problem on the 3.5.0+ kernel.
-Will
>
> If mmap_region()->uprobe_mmap() fails, unmap_and_free_vma path
> does unmap_region() but does
On 07/28/2012 12:31 PM, Oleg Nesterov wrote:
https://bugzilla.redhat.com/show_bug.cgi?id=843640
Hi Oleg,
I checked the following patch and it does fix the problem on the 3.5.0+ kernel.
-Will
If mmap_region()-uprobe_mmap() fails, unmap_and_free_vma path
does unmap_region() but does not
On 07/28, Oleg Nesterov wrote:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=843640
>
> If mmap_region()->uprobe_mmap() fails, unmap_and_free_vma path
> does unmap_region() but does not remove the soon-to-be-freed vma
> from rb tree (actually there are more problems).
Just in case...
Ingo,
https://bugzilla.redhat.com/show_bug.cgi?id=843640
If mmap_region()->uprobe_mmap() fails, unmap_and_free_vma path
does unmap_region() but does not remove the soon-to-be-freed vma
from rb tree (actually there are more problems).
Perhaps we could do do_munmap() + return in this case, but in fact
https://bugzilla.redhat.com/show_bug.cgi?id=843640
If mmap_region()-uprobe_mmap() fails, unmap_and_free_vma path
does unmap_region() but does not remove the soon-to-be-freed vma
from rb tree (actually there are more problems).
Perhaps we could do do_munmap() + return in this case, but in fact
it
On 07/28, Oleg Nesterov wrote:
https://bugzilla.redhat.com/show_bug.cgi?id=843640
If mmap_region()-uprobe_mmap() fails, unmap_and_free_vma path
does unmap_region() but does not remove the soon-to-be-freed vma
from rb tree (actually there are more problems).
Just in case...
Ingo, this is
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