On Tue, 22 Dec 2015 23:21:27 +0000, David Wilson <dw+pg@xxxxxxxx> wrote: >On Linux the memory pages of an exiting process aren't sanitized at >exit, however it is impossible(?) for userspace to reallocate them >without the kernel first zeroing their contents. Not impossible, but it requires a non-standard kernel. Since 2.6.33, mmap() accepts the flag MAP_UNINITIALIZED which allows pages to be mapped without being cleared. The flag has no effect unless the kernel was built with CONFIG_MMAP_ALLOW_UNINITIALIZED. No mainstream distro enables this. AFAIK, there is NO distro at all that enables it ... it's too big a security risk for a general purpose system. It's intended to support embedded systems where the set of programs is known. George -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
