Re: arc4random weakness

2017-03-16 Thread Andrey Chernov
On 16.03.2017 20:24, Xin LI wrote: > On Wed, Mar 15, 2017 at 1:13 PM, Andrey Chernov wrote: >> On 15.03.2017 16:06, Steven Chamberlain wrote: >>> Also it is great to see INHERIT_ZERO was added to mmap(2)! >> >> It is not so great. For a program which forks very often zeroing even >> one page will

Re: arc4random weakness

2017-03-16 Thread Xin LI
On Wed, Mar 15, 2017 at 1:13 PM, Andrey Chernov wrote: > On 15.03.2017 16:06, Steven Chamberlain wrote: >> Also it is great to see INHERIT_ZERO was added to mmap(2)! > > It is not so great. For a program which forks very often zeroing even > one page will be slowdown. It will be better and faster

Re: arc4random weakness

2017-03-16 Thread Konstantin Belousov
On Thu, Mar 16, 2017 at 01:48:45PM +0100, Dag-Erling Sm??rgrav wrote: > Andrey Chernov writes: > > Steven Chamberlain writes: > > > Also it is great to see INHERIT_ZERO was added to mmap(2)! > > It is not so great. For a program which forks very often zeroing even > > one page will be slowdown. >

Re: arc4random weakness

2017-03-16 Thread Dag-Erling Smørgrav
Andrey Chernov writes: > Steven Chamberlain writes: > > Also it is great to see INHERIT_ZERO was added to mmap(2)! > It is not so great. For a program which forks very often zeroing even > one page will be slowdown. Wouldn't it be possible to just set up the page entry but leave it unmapped, so