mirror of https://gitee.com/openkylin/linux.git
powerpc/32s: Implement dedicated kasan_init_region()
Implement a kasan_init_region() dedicated to book3s/32 that allocates KASAN regions using BATs. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/709e821602b48a1d7c211a9b156da26db98c3e9d.1589866984.git.christophe.leroy@csgroup.eu
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2b279c0348
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7974c47326
arch/powerpc
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@ -34,6 +34,7 @@ static inline void kasan_init(void) { }
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static inline void kasan_late_init(void) { }
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#endif
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void kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte);
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int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end);
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int kasan_init_region(void *start, size_t size);
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@ -4,3 +4,4 @@ KASAN_SANITIZE := n
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obj-$(CONFIG_PPC32) += kasan_init_32.o
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obj-$(CONFIG_PPC_8xx) += 8xx.o
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obj-$(CONFIG_PPC_BOOK3S_32) += book3s_32.o
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@ -0,0 +1,57 @@
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// SPDX-License-Identifier: GPL-2.0
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#define DISABLE_BRANCH_PROFILING
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#include <linux/kasan.h>
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#include <linux/memblock.h>
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#include <asm/pgalloc.h>
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#include <mm/mmu_decl.h>
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int __init kasan_init_region(void *start, size_t size)
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{
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unsigned long k_start = (unsigned long)kasan_mem_to_shadow(start);
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unsigned long k_end = (unsigned long)kasan_mem_to_shadow(start + size);
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unsigned long k_cur = k_start;
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int k_size = k_end - k_start;
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int k_size_base = 1 << (ffs(k_size) - 1);
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int ret;
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void *block;
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block = memblock_alloc(k_size, k_size_base);
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if (block && k_size_base >= SZ_128K && k_start == ALIGN(k_start, k_size_base)) {
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int k_size_more = 1 << (ffs(k_size - k_size_base) - 1);
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setbat(-1, k_start, __pa(block), k_size_base, PAGE_KERNEL);
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if (k_size_more >= SZ_128K)
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setbat(-1, k_start + k_size_base, __pa(block) + k_size_base,
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k_size_more, PAGE_KERNEL);
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if (v_block_mapped(k_start))
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k_cur = k_start + k_size_base;
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if (v_block_mapped(k_start + k_size_base))
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k_cur = k_start + k_size_base + k_size_more;
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update_bats();
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}
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if (!block)
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block = memblock_alloc(k_size, PAGE_SIZE);
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if (!block)
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return -ENOMEM;
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ret = kasan_init_shadow_page_tables(k_start, k_end);
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if (ret)
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return ret;
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kasan_update_early_region(k_start, k_cur, __pte(0));
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for (; k_cur < k_end; k_cur += PAGE_SIZE) {
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pmd_t *pmd = pmd_ptr_k(k_cur);
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void *va = block + k_cur - k_start;
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pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);
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__set_pte_at(&init_mm, k_cur, pte_offset_kernel(pmd, k_cur), pte, 0);
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}
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flush_tlb_kernel_range(k_start, k_end);
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return 0;
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}
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@ -79,7 +79,7 @@ int __init __weak kasan_init_region(void *start, size_t size)
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return 0;
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}
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static void __init
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void __init
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kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte)
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{
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unsigned long k_cur;
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