* [PATCH 3/4] arm64/mm: make tramp_pg_dir and swapper_pg_dir adjacent
@ 2018-06-01 8:09 Jun Yao
0 siblings, 0 replies; only message in thread
From: Jun Yao @ 2018-06-01 8:09 UTC (permalink / raw)
To: linux-arm-kernel
Cc: catalin.marinas, will.deacon, linux-kernel, kernel-hardening, greg
To defense KSMA, we need to migrate tramp_pg_dir and swapper_pg_dir
together. Make them adjacent to avoid modifying tramp_(un)map_kernel.
Signed-off-by: Jun Yao <yaojun8558363@gmail.com>
---
arch/arm64/kernel/entry.S | 4 ++--
arch/arm64/kernel/vmlinux.lds.S | 9 +++++----
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index ec2ee720e33e..b35425feaf56 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -1004,7 +1004,7 @@ __ni_sys_trace:
.macro tramp_map_kernel, tmp
mrs \tmp, ttbr1_el1
- add \tmp, \tmp, #(PAGE_SIZE + RESERVED_TTBR0_SIZE)
+ add \tmp, \tmp, #(PAGE_SIZE)
bic \tmp, \tmp, #USER_ASID_FLAG
msr ttbr1_el1, \tmp
#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
@@ -1023,7 +1023,7 @@ alternative_else_nop_endif
.macro tramp_unmap_kernel, tmp
mrs \tmp, ttbr1_el1
- sub \tmp, \tmp, #(PAGE_SIZE + RESERVED_TTBR0_SIZE)
+ sub \tmp, \tmp, #(PAGE_SIZE)
orr \tmp, \tmp, #USER_ASID_FLAG
msr ttbr1_el1, \tmp
/*
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 605d1b60469c..3c72e6dec890 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -219,15 +219,16 @@ SECTIONS
idmap_pg_dir = .;
. += IDMAP_DIR_SIZE;
+#ifdef CONFIG_ARM64_SW_TTBR0_PAN
+ reserved_ttbr0 = .;
+ . += RESERVED_TTBR0_SIZE;
+#endif
+
#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
tramp_pg_dir = .;
. += PAGE_SIZE;
#endif
-#ifdef CONFIG_ARM64_SW_TTBR0_PAN
- reserved_ttbr0 = .;
- . += RESERVED_TTBR0_SIZE;
-#endif
swapper_pg_dir = .;
. += SWAPPER_DIR_SIZE;
swapper_pg_end = .;
--
2.17.0
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