system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-10-02 09:18:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

iommu/vt-d: Fix PASID leak in intel_svm_unbind_mm()

Browse source 
The mm->pasid will be used in intel_svm_free_pasid() after load_pasid()
during unbinding mm. Clearing it in load_pasid() will cause PASID cannot
be freed in intel_svm_free_pasid().

Additionally mm->pasid was updated already before load_pasid() during pasid
allocation. No need to update it again in load_pasid() during binding mm.
Don't update mm->pasid to avoid the issues in both binding mm and unbinding
mm.

Fixes: 4048377414 ("iommu/vt-d: Use iommu_sva_alloc(free)_pasid() helpers")
Reported-and-tested-by: Dave Jiang <dave.jiang@intel.com>
Co-developed-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: https://lore.kernel.org/r/20210826215918.4073446-1-fenghua.yu@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210828070622.2437559-2-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Fenghua Yu 2021-08-28 15:06:21 +08:00 committed by Joerg Roedel
parent eb03f2d2f6
commit a21518cb23
1 changed files with 0 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/iommu/intel/svm.c
View file

@ -514,9 +514,6 @@ static void load_pasid(struct mm_struct *mm, u32 pasid)
{
mutex_lock(&mm->context.lock);
/* Synchronize with READ_ONCE in update_pasid(). */
smp_store_release(&mm->pasid, pasid);
/* Update PASID MSR on all CPUs running the mm's tasks. */
on_each_cpu_mask(mm_cpumask(mm), _load_pasid, NULL, true);