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| author |   Radim Krčmář <rkrcmar@ventanamicro.com> | 2025-08-05 12:44:21 +0200 |
|---|---|---|
| committer |   Anup Patel <anup@brainfault.org> | 2025-08-25 10:26:20 +0530 |
| commit | 799766208f09f95677a9ab111b93872d414fbad7 (patch) | |
| tree | 8e90fcf0e0d6686d6a5507a865cfcef8178e93c1 | |
| parent | RISC-V: KVM: Correct kvm_riscv_check_vcpu_requests() comment (diff) | |
| download | wireguard-linux-799766208f09f95677a9ab111b93872d414fbad7.tar.xz wireguard-linux-799766208f09f95677a9ab111b93872d414fbad7.zip | |
RISC-V: KVM: fix stack overrun when loading vlenb
The userspace load can put up to 2048 bits into an xlen bit stack
buffer. We want only xlen bits, so check the size beforehand.
Fixes: 2fa290372dfe ("RISC-V: KVM: add 'vlenb' Vector CSR")
Cc: stable@vger.kernel.org
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
Reviewed-by: Nutty Liu <liujingqi@lanxincomputing.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Link: https://lore.kernel.org/r/20250805104418.196023-4-rkrcmar@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
| -rw-r--r-- | arch/riscv/kvm/vcpu_vector.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vcpu_vector.c b/arch/riscv/kvm/vcpu_vector.c index a5f88cb717f3..05f3cc2d8e31 100644 --- a/arch/riscv/kvm/vcpu_vector.c +++ b/arch/riscv/kvm/vcpu_vector.c @@ -182,6 +182,8 @@ int kvm_riscv_vcpu_set_reg_vector(struct kvm_vcpu *vcpu, struct kvm_cpu_context *cntx = &vcpu->arch.guest_context; unsigned long reg_val; + if (reg_size != sizeof(reg_val)) + return -EINVAL; if (copy_from_user(®_val, uaddr, reg_size)) return -EFAULT; if (reg_val != cntx->vector.vlenb) |