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authorMark Rutland <mark.rutland@arm.com>2017-03-06 19:06:40 +0000
committerWill Deacon <will.deacon@arm.com>2017-03-10 17:41:41 +0000
commitb0de0ccc8b9edd8846828e0ecdc35deacdf186b0 (patch)
tree69c75a7acd90a43e7c3de069a8f4c1a72bacd057 /arch/arm64/mm/kasan_init.c
parentcb6950b7152fb3760942f9cb16bd2a35e5a1bfd1 (diff)
downloadlinux-b0de0ccc8b9edd8846828e0ecdc35deacdf186b0.tar.bz2
arm64: kasan: avoid bad virt_to_pfn()
Booting a v4.11-rc1 kernel with DEBUG_VIRTUAL and KASAN enabled produces the following splat (trimmed for brevity): [ 0.000000] virt_to_phys used for non-linear address: ffff200008080000 (0xffff200008080000) [ 0.000000] WARNING: CPU: 0 PID: 0 at arch/arm64/mm/physaddr.c:14 __virt_to_phys+0x48/0x70 [ 0.000000] PC is at __virt_to_phys+0x48/0x70 [ 0.000000] LR is at __virt_to_phys+0x48/0x70 [ 0.000000] Call trace: [ 0.000000] [<ffff2000080b1ac0>] __virt_to_phys+0x48/0x70 [ 0.000000] [<ffff20000a03b86c>] kasan_init+0x1c0/0x498 [ 0.000000] [<ffff20000a034018>] setup_arch+0x2fc/0x948 [ 0.000000] [<ffff20000a030c68>] start_kernel+0xb8/0x570 [ 0.000000] [<ffff20000a0301e8>] __primary_switched+0x6c/0x74 This is because we use virt_to_pfn() on a kernel image address when trying to figure out its nid, so that we can allocate its shadow from the same node. As with other recent changes, this patch uses lm_alias() to solve this. We could instead use NUMA_NO_NODE, as x86 does for all shadow allocations, though we'll likely want the "real" memory shadow to be backed from its corresponding nid anyway, so we may as well be consistent and find the nid for the image shadow. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Acked-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm/kasan_init.c')
-rw-r--r--arch/arm64/mm/kasan_init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index 55d1e9205543..687a358a3733 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -162,7 +162,7 @@ void __init kasan_init(void)
clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
vmemmap_populate(kimg_shadow_start, kimg_shadow_end,
- pfn_to_nid(virt_to_pfn(_text)));
+ pfn_to_nid(virt_to_pfn(lm_alias(_text))));
/*
* vmemmap_populate() has populated the shadow region that covers the