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iommufd 6.18 first rc pull 

Three fixes:
 
 - Syzkaller found a case where maths overflows can cause divide by 0
 
 - Typo in a compiler bug warning fix in the selftests broke the selftests
 
 - type1 compatability had a mismatch when unmapping an already unmaped
   range, it should succeed
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Merge tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd

Pull iommufd fixes from Jason Gunthorpe:

 - Syzkaller found a case where maths overflows can cause divide by 0

 - Typo in a compiler bug warning fix in the selftests broke the
   selftests

 - type1 compatability had a mismatch when unmapping an already unmapped
   range, it should succeed

* tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd:
  iommufd: Make vfio_compat's unmap succeed if the range is already empty
  iommufd/selftest: Fix ioctl return value in _test_cmd_trigger_vevents()
  iommufd: Don't overflow during division for dirty tracking
This commit is contained in:
Linus Torvalds 2025-11-07 13:13:09 -08:00
parent da32d155f4 afb47765f9
commit a2e33fb926
5 changed files with 13 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/iommu/iommufd/io_pagetable.c
View File

@ -707,7 +707,8 @@ static int iopt_unmap_iova_range(struct io_pagetable *iopt, unsigned long start,
struct iopt_area *area;
unsigned long unmapped_bytes = 0;
unsigned int tries = 0;
int rc = -ENOENT;
/* If there are no mapped entries then success */
int rc = 0;
/*
* The domains_rwsem must be held in read mode any time any area->pages
@ -777,8 +778,6 @@ static int iopt_unmap_iova_range(struct io_pagetable *iopt, unsigned long start,
down_write(&iopt->iova_rwsem);
}
if (unmapped_bytes)
rc = 0;
out_unlock_iova:
up_write(&iopt->iova_rwsem);
@ -815,13 +814,8 @@ int iopt_unmap_iova(struct io_pagetable *iopt, unsigned long iova,
int iopt_unmap_all(struct io_pagetable *iopt, unsigned long *unmapped)
{
int rc;
rc = iopt_unmap_iova_range(iopt, 0, ULONG_MAX, unmapped);
/* If the IOVAs are empty then unmap all succeeds */
if (rc == -ENOENT)
return 0;
return rc;
return iopt_unmap_iova_range(iopt, 0, ULONG_MAX, unmapped);
}
/* The caller must always free all the nodes in the allowed_iova rb_root. */

4
drivers/iommu/iommufd/ioas.c
View File

@ -367,6 +367,10 @@ int iommufd_ioas_unmap(struct iommufd_ucmd *ucmd)
&unmapped);
if (rc)
goto out_put;
if (!unmapped) {
rc = -ENOENT;
goto out_put;
}
}
cmd->length = unmapped;

5
drivers/iommu/iommufd/iova_bitmap.c
View File

@ -130,9 +130,8 @@ struct iova_bitmap {
static unsigned long iova_bitmap_offset_to_index(struct iova_bitmap *bitmap,
unsigned long iova)
{
unsigned long pgsize = 1UL << bitmap->mapped.pgshift;
return iova / (BITS_PER_TYPE(*bitmap->bitmap) * pgsize);
return (iova >> bitmap->mapped.pgshift) /
BITS_PER_TYPE(*bitmap->bitmap);
}
/*

2
tools/testing/selftests/iommu/iommufd.c
View File

@ -2638,6 +2638,8 @@ TEST_F(vfio_compat_mock_domain, map)
ASSERT_EQ(0, ioctl(self->fd, VFIO_IOMMU_MAP_DMA, &map_cmd));
ASSERT_EQ(0, ioctl(self->fd, VFIO_IOMMU_UNMAP_DMA, &unmap_cmd));
ASSERT_EQ(BUFFER_SIZE, unmap_cmd.size);
/* Unmap of empty is success */
ASSERT_EQ(0, ioctl(self->fd, VFIO_IOMMU_UNMAP_DMA, &unmap_cmd));
/* UNMAP_FLAG_ALL requires 0 iova/size */
ASSERT_EQ(0, ioctl(self->fd, VFIO_IOMMU_MAP_DMA, &map_cmd));

4
tools/testing/selftests/iommu/iommufd_utils.h
View File

@ -1044,8 +1044,8 @@ static int _test_cmd_trigger_vevents(int fd, __u32 dev_id, __u32 nvevents)
};
while (nvevents--) {
if (!ioctl(fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_TRIGGER_VEVENT),
&trigger_vevent_cmd))
if (ioctl(fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_TRIGGER_VEVENT),
&trigger_vevent_cmd))
return -1;
}
return 0;