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powerpc/32s: Use dedicated segment for modules with STRICT_KERNEL_RWX

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When STRICT_KERNEL_RWX is set, we want to set NX bit on vmalloc
segments. But modules require exec.

Use a dedicated segment for modules. There is not much space
above kernel, and we don't waste vmalloc space to do alignment.
Therefore, we take the segment before PAGE_OFFSET for modules.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/eb8faba9148b6cf17c696ba776b4e8ee2f6313bf.1593428200.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2020-06-29 11:15:26 +00:00
committed by Michael Ellerman
parent f1a1f7a15e
commit 6ca055322d
3 changed files with 14 additions and 10 deletions
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arch/powerpc/Kconfig
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@@ -1213,6 +1213,7 @@ config TASK_SIZE_BOOL
config TASK_SIZE
hex "Size of user task space" if TASK_SIZE_BOOL
default "0x80000000" if PPC_8xx
default "0xb0000000" if PPC_BOOK3S_32 && STRICT_KERNEL_RWX
default "0xc0000000"
endmenu