On 02/02/2017 02:32 PM, Yann Ylavic wrote:
On Thu, Feb 2, 2017 at 11:19 PM, Jacob Champion <champio...@gmail.com> wrote:
Idle thoughts: "Cannot access memory" in this case could be a red herring,
if Niklas' gdb can't peer into mmap'd memory spaces [1]. It seems reasonable
that the data in question could be mmap'd, given the nice round address and
4 MiB length (equal to APR_MMAP_LIMIT).
That doesn't mean we're looking in the wrong place, though, since SIGBUS can
also be generated by an out-of-bounds access to an mmap'd region.
Right, looks like the memory has been unmapped though (SIGBUS) before
being (re)used.
Oh, I thought an access after an unmap would SIGSEGV instead of SIGBUS.
I haven't ever tested that out; I should try it...
--Jacob
