| commit | 9debd1975effe323c0c81247c5385d56eaf34c51 | [log] [tgz] |
|---|---|---|
| author | Ghanan Gowripalan <ghanan@fuchsia.infra.roller.google.com> | Wed Feb 28 18:45:48 2024 +0000 |
| committer | Copybara-Service <copybara-worker@google.com> | Wed Feb 28 10:46:50 2024 -0800 |
| tree | c52a67550223bccaebcbd85aa2e1a40b708f2acf | |
| parent | 6a20198e0f9449b241b850cedf5c14be04abbf42 [diff] |
[roll] Roll fuchsia [kernel] Fix datagram socket read with bad buffer ...by consuming the whole datagram when a fault occurs while copying a datagram from an `Mbuf` chain. Previously, reading from an `Mbuf` chain would immediately abort if an error was encountered when copying bytes to userspace. However, for datagram packets, the first `Mbuf` in a chain sets the `pkt_len_` field which indicates how long the packet is; all other `Mbuf`s that are backing the datagram packet will not have `pkt_len_` set. This means that if userspace provided a read buffer that will fault _after_ the initial `Mbuf` has been read (and then freed), `Mbuf`'s read helper will abort the read and leave the remaining `Mbuf` list as-is. This means that a later read will observe a zero sized packet even though a full datagram may exist in the socket since the chain's first `Mbuf` has a `pkt_len_` of 0. Original-Bug: b/318701791, b/42109418 Original-Fixed: b/326309348 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/994605 Original-Revision: 879b0241f6fc1e86826bdcd1cdb1971c330dc09b GitOrigin-RevId: 59dab46482854f8fb751ab5f11b3d215ebc10a08 Change-Id: Ia1bbf425e45c7ba983b1b1281f526fe4bf1686f5
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