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powerpc/32s: Only leave NX unset on segments used for modules

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Instead of leaving NX unset on all segments above the start
of vmalloc space, only leave NX unset on segments used 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/7172c0f5253419315e434a1816ee3d6ed6505bc0.1593428200.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-06-29 11:15:22 +00:00 committed by Michael Ellerman
parent 7fbc22ce29
commit c496433197
1 changed files with 14 additions and 3 deletions
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17
arch/powerpc/mm/book3s32/mmu.c
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@ -187,6 +187,17 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
return __mmu_mapin_ram(border, top);
}
static bool is_module_segment(unsigned long addr)
{
if (!IS_ENABLED(CONFIG_MODULES))
return false;
if (addr < ALIGN_DOWN(VMALLOC_START, SZ_256M))
return false;
if (addr >= ALIGN(VMALLOC_END, SZ_256M))
return false;
return true;
}
void mmu_mark_initmem_nx(void)
{
int nb = mmu_has_feature(MMU_FTR_USE_HIGH_BATS) ? 8 : 4;
@ -223,9 +234,9 @@ void mmu_mark_initmem_nx(void)
for (i = TASK_SIZE >> 28; i < 16; i++) {
/* Do not set NX on VM space for modules */
if (IS_ENABLED(CONFIG_MODULES) &&
(VMALLOC_START & 0xf0000000) == i << 28)
break;
if (is_module_segment(i << 28))
continue;
mtsrin(mfsrin(i << 28) | 0x10000000, i << 28);
}
}