From 73b0195416c4063c7cbf22b305ee6c48d6cd2d24 Mon Sep 17 00:00:00 2001 From: Atish Patra Date: Wed, 24 Jul 2024 01:31:36 -0700 Subject: [PATCH] target/riscv: Add asserts for out-of-bound access Coverity complained about the possible out-of-bounds access with counter_virt/counter_virt_prev because these two arrays are accessed with privilege mode. However, these two arrays are accessed only when virt is enabled. Thus, the privilege mode can't be M mode. Add the asserts anyways to detect any wrong usage of these arrays in the future. Suggested-by: Peter Maydell Signed-off-by: Atish Patra Fixes: Coverity CID 1558459 Fixes: Coverity CID 1558462 Reviewed-by: Alistair Francis Message-ID: <20240724-fixes-v1-1-4a64596b0d64@rivosinc.com> Signed-off-by: Alistair Francis --- target/riscv/pmu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/target/riscv/pmu.c b/target/riscv/pmu.c index 3cc0b3648c..e05ab067d2 100644 --- a/target/riscv/pmu.c +++ b/target/riscv/pmu.c @@ -204,6 +204,7 @@ static void riscv_pmu_icount_update_priv(CPURISCVState *env, } if (env->virt_enabled) { + g_assert(env->priv <= PRV_S); counter_arr = env->pmu_fixed_ctrs[1].counter_virt; snapshot_prev = env->pmu_fixed_ctrs[1].counter_virt_prev; } else { @@ -212,6 +213,7 @@ static void riscv_pmu_icount_update_priv(CPURISCVState *env, } if (new_virt) { + g_assert(newpriv <= PRV_S); snapshot_new = env->pmu_fixed_ctrs[1].counter_virt_prev; } else { snapshot_new = env->pmu_fixed_ctrs[1].counter_prev; @@ -242,6 +244,7 @@ static void riscv_pmu_cycle_update_priv(CPURISCVState *env, } if (env->virt_enabled) { + g_assert(env->priv <= PRV_S); counter_arr = env->pmu_fixed_ctrs[0].counter_virt; snapshot_prev = env->pmu_fixed_ctrs[0].counter_virt_prev; } else { @@ -250,6 +253,7 @@ static void riscv_pmu_cycle_update_priv(CPURISCVState *env, } if (new_virt) { + g_assert(newpriv <= PRV_S); snapshot_new = env->pmu_fixed_ctrs[0].counter_virt_prev; } else { snapshot_new = env->pmu_fixed_ctrs[0].counter_prev;