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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

SocketAncillary accepts an arbitrary slice as input even if the slice is not correctly aligned to cmsghdr. This is unsound.

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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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