powerpc: Keep const vars out of writable .sdata

Michael Ellerman patch-notifications at ellerman.id.au
Wed Mar 7 00:31:17 AEDT 2018

On Thu, 2018-03-01 at 01:02:49 UTC, Kees Cook wrote:
> From: Segher Boessenkool <segher at kernel.crashing.org>
> Newer gcc will support "-mno-readonly-in-sdata"[1], which makes sure that
> the optimization on PPC32 for variables getting moved into the .sdata
> section will not apply to const variables (which must be in .rodata).
> This was originally noticed in mm/rodata_test.c when rodata_test_data
> was not static:
> c0695034 g     O .data	00000004 rodata_test_data
> After this patch with an updated compiler, this is correctly in .rodata.
> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82411
> Reported-by: Christophe Leroy <christophe.leroy at c-s.fr>
> Signed-off-by: Segher Boessenkool <segher at kernel.crashing.org>
> Signed-off-by: Kees Cook <keescook at chromium.org>

Applied to powerpc next, thanks.



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