diff options
| author | Alexander Bulekov <alxndr@bu.edu> | 2021-01-20 01:02:55 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-08 14:43:54 +0100 |
| commit | fc1c8344e65807843ae8eaa25284e5277bdcd1eb (patch) | |
| tree | a14b23020cf22dc265017b4f6daec6dd4de02707 /softmmu/physmem.c | |
| parent | 6f0e9c26dbae9ac18b89d359791008fe3432ca91 (diff) | |
fuzz: ignore address_space_map is_write flag
We passed an is_write flag to the fuzz_dma_read_cb function to
differentiate between the mapped DMA regions that need to be populated
with fuzzed data, and those that don't. We simply passed through the
address_space_map is_write parameter. The goal was to cut down on
unnecessarily populating mapped DMA regions, when they are not read
from.
Unfortunately, nothing precludes code from reading from regions mapped
with is_write=true. For example, see:
https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg04729.html
This patch removes the is_write parameter to fuzz_dma_read_cb. As a
result, we will fill all mapped DMA regions with fuzzed data, ignoring
the specified transfer direction.
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-Id: <20210120060255.558535-1-alxndr@bu.edu>
Diffstat (limited to 'softmmu/physmem.c')
| -rw-r--r-- | softmmu/physmem.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 243c3097d3..96efaef97a 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -2839,7 +2839,7 @@ MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr, stn_he_p(buf, l, val); } else { /* RAM case */ - fuzz_dma_read_cb(addr, len, mr, false); + fuzz_dma_read_cb(addr, len, mr); ram_ptr = qemu_ram_ptr_length(mr->ram_block, addr1, &l, false); memcpy(buf, ram_ptr, l); } @@ -3200,7 +3200,7 @@ void *address_space_map(AddressSpace *as, memory_region_ref(mr); *plen = flatview_extend_translation(fv, addr, len, mr, xlat, l, is_write, attrs); - fuzz_dma_read_cb(addr, *plen, mr, is_write); + fuzz_dma_read_cb(addr, *plen, mr); ptr = qemu_ram_ptr_length(mr->ram_block, xlat, plen, true); return ptr; |