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UPSTREAM: KVM: arm64: Fix off-by-one in range_is_memory

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Hyp checks whether an address range only covers RAM by checking the
start/endpoints against a list of memblock_region structs. However,
the endpoint here is exclusive but internally is treated as inclusive.
Fix the off-by-one error that caused valid address ranges to be
rejected.

Cc: Quentin Perret <qperret@google.com>
Fixes: 90134ac9ca ("KVM: arm64: Protect the .hyp sections from the host")
Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210728153232.1018911-2-dbrazdil@google.com
(cherry picked from commit facee1be76)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 192636784
Change-Id: I01fade3ef4b0bce6741bad238c83a1faee94499f
This commit is contained in:
David Brazdil
2021-07-28 15:32:31 +00:00
committed by Will Deacon
parent d925d4245f
commit a8a89c03a2
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/kvm/hyp/nvhe/mem_protect.c
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@@ -193,7 +193,7 @@ static bool range_is_memory(u64 start, u64 end)
{
struct kvm_mem_range r1, r2;
if (!find_mem_range(start, &r1) || !find_mem_range(end, &r2))
if (!find_mem_range(start, &r1) || !find_mem_range(end - 1, &r2))
return false;
if (r1.start != r2.start)
return false;