[lkml]   [2004]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] mremap NULL pointer dereference fix

> To trigger the bug you have to have _just_ the right memory usage, I
> suspect. You literally have to have the destination page directory
> allocation unmap the _exact_ source page (which has to be clean) for the
> bug to hit.

To trigger the bug, I have to run my test program in a "while true;"
loop for an hour or so.

> So I suspect the oops only triggers on the machine that the trigger
> program was written for.
> Your version of the patch saves a goto in the source, but results in an
> extra goto in the generated assembly unless the compiler is clever enough
> to notice the double test for NULL.
> Never mind, that's a micro-optimization, and your version is cleaner.
> Let's go with it if Rajesh can verify that it fixes the problem for him.

I will test the patch and report.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:01    [W:0.078 / U:0.428 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site