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util/vfio-helpers: Assert offset is aligned to page size

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mmap(2) states:

  'offset' must be a multiple of the page size as returned
   by sysconf(_SC_PAGE_SIZE).

Add an assertion to be sure we don't break this contract.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20201103020733.2303148-8-philmd@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2020-11-03 03:07:33 +01:00 committed by Stefan Hajnoczi
parent f6b8104d0b
commit fc107d8684
1 changed files with 1 additions and 0 deletions
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util/vfio-helpers.c
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@ -162,6 +162,7 @@ void *qemu_vfio_pci_map_bar(QEMUVFIOState *s, int index,
Error **errp)
{
void *p;
assert(QEMU_IS_ALIGNED(offset, qemu_real_host_page_size));
assert_bar_index_valid(s, index);
p = mmap(NULL, MIN(size, s->bar_region_info[index].size - offset),
prot, MAP_SHARED,