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authorMichael Ellerman <mpe@ellerman.id.au>2017-07-14 08:51:21 +0200
committerMichael Ellerman <mpe@ellerman.id.au>2017-07-18 10:51:34 +0200
commitb134bd90286dc9f2952c35a91ab405474ca9374c (patch)
treeb131270d9caf84f46fc043aa02c12abe9414ea80 /arch
parentpowerpc/64s: Fix hypercall entry clobbering r12 input (diff)
downloadlinux-b134bd90286dc9f2952c35a91ab405474ca9374c.tar.xz
linux-b134bd90286dc9f2952c35a91ab405474ca9374c.zip
powerpc/mm/radix: Refactor radix__mark_rodata_ro()
Move the core logic into a helper, so we can use it for changing permissions other than _PAGE_WRITE. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/pgtable-radix.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 8c13e4282308..336e52ec652c 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -112,10 +112,9 @@ set_the_pte:
}
#ifdef CONFIG_STRICT_KERNEL_RWX
-void radix__mark_rodata_ro(void)
+void radix__change_memory_range(unsigned long start, unsigned long end,
+ unsigned long clear)
{
- unsigned long start = (unsigned long)_stext;
- unsigned long end = (unsigned long)__init_begin;
unsigned long idx;
pgd_t *pgdp;
pud_t *pudp;
@@ -125,7 +124,8 @@ void radix__mark_rodata_ro(void)
start = ALIGN_DOWN(start, PAGE_SIZE);
end = PAGE_ALIGN(end); // aligns up
- pr_devel("marking ro start %lx, end %lx\n", start, end);
+ pr_debug("Changing flags on range %lx-%lx removing 0x%lx\n",
+ start, end, clear);
for (idx = start; idx < end; idx += PAGE_SIZE) {
pgdp = pgd_offset_k(idx);
@@ -147,11 +147,21 @@ void radix__mark_rodata_ro(void)
if (!ptep)
continue;
update_the_pte:
- radix__pte_update(&init_mm, idx, ptep, _PAGE_WRITE, 0, 0);
+ radix__pte_update(&init_mm, idx, ptep, clear, 0, 0);
}
radix__flush_tlb_kernel_range(start, end);
}
+
+void radix__mark_rodata_ro(void)
+{
+ unsigned long start, end;
+
+ start = (unsigned long)_stext;
+ end = (unsigned long)__init_begin;
+
+ radix__change_memory_range(start, end, _PAGE_WRITE);
+}
#endif /* CONFIG_STRICT_KERNEL_RWX */
static inline void __meminit print_mapping(unsigned long start,