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Message-Id: <1487498660-16600-6-git-send-email-hoeun.ryu@gmail.com>
Date: Sun, 19 Feb 2017 19:04:09 +0900
From: Hoeun Ryu <hoeun.ryu@...il.com>
To: kernel-hardening@...ts.openwall.com,
linux-kernel@...r.kernel.org
Cc: Hoeun Ryu <hoeun.ryu@...il.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Mark Rutland <mark.rutland@....com>,
Laura Abbott <labbott@...hat.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
Jeremy Linton <jeremy.linton@....com>,
linux-arm-kernel@...ts.infradead.org
Subject: [RFC 6/7] arm64: add __map_kernel_segment to accept additional vm flags
Memory attribute for `__ro_mostly_after_init` section should be changed
via set_memory_rw/ro that doesn't work against vm areas which don't have
VM_ALLOC. Add this function to map `__ro_mostly_after_init` section with
VM_ALLOC flag set in map_kernel.
Signed-off-by: Hoeun Ryu <hoeun.ryu@...il.com>
---
arch/arm64/mm/mmu.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index b805c01..91271b1 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -444,8 +444,10 @@ void mark_rodata_ro(void)
debug_checkwx();
}
-static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end,
- pgprot_t prot, struct vm_struct *vma)
+static void __init __map_kernel_segment(pgd_t *pgd,
+ void *va_start, void *va_end,
+ pgprot_t prot, struct vm_struct *vma,
+ unsigned long flags)
{
phys_addr_t pa_start = __pa_symbol(va_start);
unsigned long size = va_end - va_start;
@@ -459,12 +461,18 @@ static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end,
vma->addr = va_start;
vma->phys_addr = pa_start;
vma->size = size;
- vma->flags = VM_MAP;
+ vma->flags = flags;
vma->caller = __builtin_return_address(0);
vm_area_add_early(vma);
}
+static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end,
+ pgprot_t prot, struct vm_struct *vma)
+{
+ return __map_kernel_segment(pgd, va_start, va_end, prot, vma, VM_MAP);
+}
+
/*
* Create fine-grained mappings for the kernel.
*/
--
2.7.4
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