On Wed, Apr 27, 2011 at 9:24 PM, Modulok modu...@gmail.com wrote:
I know that each process has its own private memory segment, but after a
process exits, it nolonger owns that memory. What happens to it? If it's not
zeroed out by my process, and it doesn't turn into pixie food, and it's not
On Fri, Apr 29, 2011 at 01:54:06AM +0100, RW wrote:
On Thu, 28 Apr 2011 13:17:41 -0400
Bob Hall rjh...@gmail.com wrote:
On Thu, Apr 28, 2011 at 12:10:10AM +0100, RW wrote:
I'm not saying that anonymous mappings used by malloc aren't
zero-filled, just that it's not mentioned anywhere in
On Fri, 29 Apr 2011 12:00:00 -0400
Bob Hall rjh...@gmail.com wrote:
On Fri, Apr 29, 2011 at 01:54:06AM +0100, RW wrote:
but they aren't the same - that's what the quotes were about.
Looking back, I don't see anything in your quotes that raises the
issue of anonymous objects being used
On Thu, Apr 28, 2011 at 12:10:10AM +0100, RW wrote:
I'm not saying that anonymous mappings used by malloc aren't
zero-filled, just that it's not mentioned anywhere in the mmap man
page. I think it's just taken as read.
I just got what you're trying to say. Unfortunately, your quotes mislead
me
On Thu, 28 Apr 2011 13:17:41 -0400
Bob Hall rjh...@gmail.com wrote:
On Thu, Apr 28, 2011 at 12:10:10AM +0100, RW wrote:
I'm not saying that anonymous mappings used by malloc aren't
zero-filled, just that it's not mentioned anywhere in the mmap man
page. I think it's just taken as read.
On Tue, Apr 26, 2011 at 11:41 AM, RW rwmailli...@googlemail.com
wrote:
The above quote states that the memory not occupied by the remapped
object is zero filled. Which is to say that memory allocated by
mmap() is either filled with new data or filled with zeros.
In context it says:
If
On Sun, Apr 24, 2011 at 7:10 PM, Modulok modu...@gmail.com wrote:
I don't know if this is a problem on FreeBSD...
Process A requests memory.
Process A Stores a plaintext password in memory or other sensitive
data. Process A terminates and the memory is reclaimed by kernel.
Process B
Modulok modu...@gmail.com writes:
On Sun, Apr 24, 2011 at 7:10 PM, Modulok modu...@gmail.com wrote:
I don't know if this is a problem on FreeBSD...
Process A requests memory.
Process A Stores a plaintext password in memory or other sensitive
data. Process A terminates and the memory is
On Wed, 27 Apr 2011 06:14:02 -0400
Bob Hall rjh...@gmail.com wrote:
malloc() uses either sbrk or mmap to extend the heap. As far as I
know, sbrk extends the heap with zero filled memory. According to the
man page, mmap extends it either with remapped data, or with remapped
data plus
On Mon, 25 Apr 2011 22:56:14 -0400
Bob Hall rjh...@gmail.com wrote:
On Mon, Apr 25, 2011 at 11:29:08PM +0100, RW wrote:
On Mon, 25 Apr 2011 13:54:20 -0400
Bob Hall rjh...@gmail.com wrote:
On Mon, Apr 25, 2011 at 05:46:33PM +0200, C. P. Ghost wrote:
On Mon, Apr 25, 2011 at 5:15 PM,
On Mon, 25 Apr 2011 23:29:08 +0100
RW rwmailli...@googlemail.com wrote:
The reason I thought that heap memory isn't zeroed is from the
discussion of pre-zeroed pages in this article:
There's an idlezero task that runs by default (via
the vm.idlezero_enable sysctl), zeroing unused pages, but
On Tue, 26 Apr 2011 10:48:53 +0100
Bruce Cran br...@cran.org.uk wrote:
On Mon, 25 Apr 2011 23:29:08 +0100
RW rwmailli...@googlemail.com wrote:
The reason I thought that heap memory isn't zeroed is from the
discussion of pre-zeroed pages in this article:
There's an idlezero task that
On Tue, Apr 26, 2011 at 11:41 AM, RW rwmailli...@googlemail.com wrote:
The above quote states that the memory not occupied by the remapped
object is zero filled. Which is to say that memory allocated by mmap()
is either filled with new data or filled with zeros.
In context it says:
If
On Tue, 26 Apr 2011 16:23:11 +0200
C. P. Ghost cpgh...@cordula.ws wrote:
On Tue, Apr 26, 2011 at 11:41 AM, RW rwmailli...@googlemail.com
wrote:
The above quote states that the memory not occupied by the remapped
object is zero filled. Which is to say that memory allocated by
mmap() is
On Sun, 24 Apr 2011 19:53:41 +0200
C. P. Ghost cpgh...@cordula.ws wrote:
On Sun, Apr 24, 2011 at 7:10 PM, Modulok modu...@gmail.com wrote:
I don't know if this is a problem on FreeBSD...
Process A requests memory.
Process A Stores a plaintext password in memory or other sensitive
data.
On Mon, Apr 25, 2011 at 03:18:46PM +0100, RW wrote:
I don't believe the heap is allocated zeroed pages. The kernel
does allocate such pages to the BSS segment, but that's because it
holds zeroed data such as C static variables.
According to McKusick and Neville-Neil's book on FreeBSD, sbrk
On Mon, Apr 25, 2011 at 5:15 PM, Bob Hall rjh...@gmail.com wrote:
On Mon, Apr 25, 2011 at 03:18:46PM +0100, RW wrote:
I don't believe the heap is allocated zeroed pages. The kernel
does allocate such pages to the BSS segment, but that's because it
holds zeroed data such as C static variables.
On Mon, Apr 25, 2011 at 05:46:33PM +0200, C. P. Ghost wrote:
On Mon, Apr 25, 2011 at 5:15 PM, Bob Hall rjh...@gmail.com wrote:
On Mon, Apr 25, 2011 at 03:18:46PM +0100, RW wrote:
I don't believe the heap is allocated zeroed pages. The kernel
does allocate such pages to the BSS segment, but
On Mon, 25 Apr 2011 13:54:20 -0400
Bob Hall rjh...@gmail.com wrote:
On Mon, Apr 25, 2011 at 05:46:33PM +0200, C. P. Ghost wrote:
On Mon, Apr 25, 2011 at 5:15 PM, Bob Hall rjh...@gmail.com wrote:
On Mon, Apr 25, 2011 at 03:18:46PM +0100, RW wrote:
I don't believe the heap is allocated
On Mon, Apr 25, 2011 at 11:29:08PM +0100, RW wrote:
On Mon, 25 Apr 2011 13:54:20 -0400
Bob Hall rjh...@gmail.com wrote:
On Mon, Apr 25, 2011 at 05:46:33PM +0200, C. P. Ghost wrote:
On Mon, Apr 25, 2011 at 5:15 PM, Bob Hall rjh...@gmail.com wrote:
On Mon, Apr 25, 2011 at 03:18:46PM
I don't know if this is a problem on FreeBSD...
Process A requests memory.
Process A Stores a plaintext password in memory or other sensitive data.
Process A terminates and the memory is reclaimed by kernel.
Process B requests a *huge* chunk of memory.
Process B crawls the uninitialized memory,
On Sun, Apr 24, 2011 at 7:10 PM, Modulok modu...@gmail.com wrote:
I don't know if this is a problem on FreeBSD...
Process A requests memory.
Process A Stores a plaintext password in memory or other sensitive data.
Process A terminates and the memory is reclaimed by kernel.
Process B
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