[PATCH 5.18 671/879] iommu/arm-smmu-v3-sva: Fix mm use-after-free

Greg Kroah-Hartman
2022-06-08T01:03:39Z

From: Jean-Philippe Brucker <jean-philippe@linaro.org>

[ Upstream commit cbd23144f7662b00bcde32a938c4a4057e476d68 ]

We currently call arm64_mm_context_put() without holding a reference to
the mm, which can result in use-after-free. Call mmgrab()/mmdrop() to
ensure the mm only gets freed after we unpinned the ASID.

Fixes: 32784a9562fb ("iommu/arm-smmu-v3: Implement iommu_sva_bind/unbind()")
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Link: https://lore.kernel.org/r/20220426130444.300556-1-jean-philippe@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index c623dae1e115..1ef7bbb4acf3 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -6,6 +6,7 @@
#include <linux/mm.h>
#include <linux/mmu_context.h>
#include <linux/mmu_notifier.h>
+#include <linux/sched/mm.h>
#include <linux/slab.h>

#include "arm-smmu-v3.h"
@@ -96,9 +97,14 @@ static struct arm_smmu_ctx_desc *arm_smmu_alloc_shared_cd(struct mm_struct *mm)
struct arm_smmu_ctx_desc *cd;
struct arm_smmu_ctx_desc *ret = NULL;

+ /* Don't free the mm until we release the ASID */
+ mmgrab(mm);
+
asid = arm64_mm_context_get(mm);
- if (!asid)
- return ERR_PTR(-ESRCH);
+ if (!asid) {
+ err = -ESRCH;
+ goto out_drop_mm;
+ }

cd = kzalloc(sizeof(*cd), GFP_KERNEL);
if (!cd) {
@@ -165,6 +171,8 @@ static struct arm_smmu_ctx_desc *arm_smmu_alloc_shared_cd(struct mm_struct *mm)
kfree(cd);
out_put_context:
arm64_mm_context_put(mm);
+out_drop_mm:
+ mmdrop(mm);
return err < 0 ? ERR_PTR(err) : ret;
}

@@ -173,6 +181,7 @@ static void arm_smmu_free_shared_cd(struct arm_smmu_ctx_desc *cd)
if (arm_smmu_free_asid(cd)) {
/* Unpin ASID */
arm64_mm_context_put(cd->mm);
+ mmdrop(cd->mm);
kfree(cd);
}
}
--
2.35.1