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powerpc: Use MODULES_VADDR if defined

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In order to allow allocation of modules outside of vmalloc space,
use MODULES_VADDR and MODULES_END when MODULES_VADDR is defined.

Redefine module_alloc() when MODULES_VADDR defined.
Unmap corresponding KASAN shadow memory.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7ecf5fff1eef67d450e73fc412b6ec3818483d75.1593428200.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-06-29 11:15:21 +00:00 committed by Michael Ellerman
parent ccc8fcf72a
commit 7fbc22ce29
2 changed files with 17 additions and 0 deletions
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11
arch/powerpc/kernel/module.c
View file

@ -86,3 +86,14 @@ int module_finalize(const Elf_Ehdr *hdr,
return 0;
}
#ifdef MODULES_VADDR
void *module_alloc(unsigned long size)
{
BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, GFP_KERNEL,
PAGE_KERNEL_EXEC, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
__builtin_return_address(0));
}
#endif

6
arch/powerpc/mm/kasan/kasan_init_32.c
View file

@ -115,6 +115,12 @@ static void __init kasan_unmap_early_shadow_vmalloc(void)
unsigned long k_end = (unsigned long)kasan_mem_to_shadow((void *)VMALLOC_END);
kasan_update_early_region(k_start, k_end, __pte(0));
#ifdef MODULES_VADDR
k_start = (unsigned long)kasan_mem_to_shadow((void *)MODULES_VADDR);
k_end = (unsigned long)kasan_mem_to_shadow((void *)MODULES_END);
kasan_update_early_region(k_start, k_end, __pte(0));
#endif
}
void __init kasan_mmu_init(void)