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SocketAncillary doesn't ensure the control buffer is aligned at least as much as cmsghdr #139861

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SocketAncillary doesn't ensure the control buffer is aligned at least as much as cmsghdr#139861
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A-ioArea: `std::io`, `std::fs`, `std::net` and `std::path`C-bugCategory: This is a bug.F-unix_socket_ancillary_data`#![feature(unix_socket_ancillary_data)]`O-unixOperating system: Unix-likeT-libsRelevant to the library team, which will review and decide on the PR/issue.
@bjorn3

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@bjorn3
bjorn3
opened on Apr 15, 2025
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SocketAncillary accepts an arbitrary slice as input even if the slice is not correctly aligned to cmsghdr. This is unsound.

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bjorn3
added
C-bugCategory: This is a bug.
O-unixOperating system: Unix-like
requires-nightlyThis issue requires a nightly compiler in some way.
T-libsRelevant to the library team, which will review and decide on the PR/issue.
on Apr 15, 2025
rustbot
added
needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.
on Apr 15, 2025
zopsicle

zopsicle commented on Apr 15, 2025

@zopsicle
zopsicle
on Apr 15, 2025
Contributor

Approaches to solve this were discussed in the tracking issue: #76915

jieyouxu
added
A-ioArea: `std::io`, `std::fs`, `std::net` and `std::path`
F-unix_socket_ancillary_data`#![feature(unix_socket_ancillary_data)]`
and removed
needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.
requires-nightlyThis issue requires a nightly compiler in some way.
on Apr 30, 2025
jieyouxu
mentioned this on Apr 30, 2025
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    A-ioArea: `std::io`, `std::fs`, `std::net` and `std::path`C-bugCategory: This is a bug.F-unix_socket_ancillary_data`#![feature(unix_socket_ancillary_data)]`O-unixOperating system: Unix-likeT-libsRelevant to the library team, which will review and decide on the PR/issue.

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          SocketAncillary doesn't ensure the control buffer is aligned at least as much as cmsghdr · Issue #139861 · rust-lang/rust