From: Segher Boessenkool

Sent: 25 September 2017 08:37
On Sun, Sep 24, 2017 at 12:17:51PM -0700, Kees Cook wrote:

quoted

On Thu, Sep 21, 2017 at 2:37 AM, Christophe Leroy
[off-list ref] wrote:

quoted

On powerpc, RODATA_TEST fails with message the following messages:

[    6.199505] Freeing unused kernel memory: 528K
[    6.203935] rodata_test: test data was not read only

This is because GCC allocates it to .data section:

c0695034 g     O .data  00000004 rodata_test_data

Uuuh... that seems like a compiler bug. It's marked "const" -- it
should never end up in .data. I would argue that this has done exactly
what it was supposed to do, and shows that something has gone wrong.
It should always be const. Adding "static" should just change
visibility. (I'm not opposed to the static change, but it seems to
paper over a problem with the compiler...)

The compiler puts this item in .sdata, for 32-bit.  There is no .srodata,
so if it wants to use a small data section, it must use .sdata .

Non-external, non-referenced symbols are not put in .sdata, that is the
difference you see with the "static".

I don't think there is a bug here.  If you think there is, please open
a GCC bug.

The .sxxx sections are for 'small' data that can be accessed (typically)
using small offsets from a global register.
This means that all sections must be adjacent in the image.
So you can't really have readonly small data.

My guess is that the linker script is putting .srodata in with .sdata.

	David

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