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fs: avoid unaligned access when copying btrfs search headers

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The assignment operator will use member-wise assignment, which
assumes the object's this pointer is aligned.  That doesn't
happen when the object in question is part of a btrfs search
result, and aarch64 faults over it.

Use memcpy instead, which has no alignment constraints.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2021-08-12 19:23:25 -04:00
parent 69c3d99552
commit a9cd19a5fe
1 changed files with 1 additions and 1 deletions
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2
lib/fs.cc
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@ -748,7 +748,7 @@ namespace crucible {
BtrfsIoctlSearchHeader::set_data(const vector<uint8_t> &v, size_t offset) BtrfsIoctlSearchHeader::set_data(const vector<uint8_t> &v, size_t offset)
{ {
THROW_CHECK2(invalid_argument, offset, v.size(), offset + sizeof(btrfs_ioctl_search_header) <= v.size()); THROW_CHECK2(invalid_argument, offset, v.size(), offset + sizeof(btrfs_ioctl_search_header) <= v.size());
*static_cast<btrfs_ioctl_search_header *>(this) = *reinterpret_cast<const btrfs_ioctl_search_header *>(&v[offset]); memcpy(static_cast<btrfs_ioctl_search_header *>(this), &v[offset], sizeof(btrfs_ioctl_search_header));
offset += sizeof(btrfs_ioctl_search_header); offset += sizeof(btrfs_ioctl_search_header);
THROW_CHECK2(invalid_argument, offset + len, v.size(), offset + len <= v.size()); THROW_CHECK2(invalid_argument, offset + len, v.size(), offset + len <= v.size());
m_data = Spanner<const uint8_t>(&v[offset], &v[offset + len]); m_data = Spanner<const uint8_t>(&v[offset], &v[offset + len]);