linux-kernel - [PATCH] riscv: kvm: Fix out-of-bounds array access

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Message-ID: <20241104191503.74725-1-bjorn@kernel.org>
Date: Mon,  4 Nov 2024 20:15:01 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Anup Patel <anup@...infault.org>,
	Atish Patra <atishp@...shpatra.org>,
	kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org,
	linux-riscv@...ts.infradead.org
Cc: Björn Töpel <bjorn@...osinc.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] riscv: kvm: Fix out-of-bounds array access

From: Björn Töpel <bjorn@...osinc.com>

In kvm_riscv_vcpu_sbi_init() the entry->ext_idx can contain an
out-of-bound index. This is used as a special marker for the base
extensions, that cannot be disabled. However, when traversing the
extensions, that special marker is not checked prior indexing the
array.

Add an out-of-bounds check to the function.

Fixes: 56d8a385b605 ("RISC-V: KVM: Allow some SBI extensions to be disabled by default")
Signed-off-by: Björn Töpel <bjorn@...osinc.com>
---
Don't know if it matters, but I hit this when trying kvmtool.


Björn
---
arch/riscv/kvm/vcpu_sbi.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/kvm/vcpu_sbi.c b/arch/riscv/kvm/vcpu_sbi.c
index 7de128be8db9..6e704ed86a83 100644
--- a/arch/riscv/kvm/vcpu_sbi.c
+++ b/arch/riscv/kvm/vcpu_sbi.c
@@ -486,19 +486,22 @@ void kvm_riscv_vcpu_sbi_init(struct kvm_vcpu *vcpu)
 	struct kvm_vcpu_sbi_context *scontext = &vcpu->arch.sbi_context;
 	const struct kvm_riscv_sbi_extension_entry *entry;
 	const struct kvm_vcpu_sbi_extension *ext;
-	int i;
+	int idx, i;
 
 	for (i = 0; i < ARRAY_SIZE(sbi_ext); i++) {
 		entry = &sbi_ext[i];
 		ext = entry->ext_ptr;
+		idx = entry->ext_idx;
+
+		if (idx < 0 || idx >= ARRAY_SIZE(scontext->ext_status))
+			continue;
 
 		if (ext->probe && !ext->probe(vcpu)) {
-			scontext->ext_status[entry->ext_idx] =
-				KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE;
+			scontext->ext_status[idx] = KVM_RISCV_SBI_EXT_STATUS_UNAVAILABLE;
 			continue;
 		}
 
-		scontext->ext_status[entry->ext_idx] = ext->default_disabled ?
+		scontext->ext_status[idx] = ext->default_disabled ?
 					KVM_RISCV_SBI_EXT_STATUS_DISABLED :
 					KVM_RISCV_SBI_EXT_STATUS_ENABLED;
 	}

base-commit: 59b723cd2adbac2a34fc8e12c74ae26ae45bf230
-- 
2.43.0