Revise dl_iterate_phdr callback to be sound-ish
#660
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We - no longer pretend the entire Unixverse is GNU/Linux - no longer pretend static linking does not exist - no longer dereference pointers without checking them, except for the info object itself, where it's libc's responsibility to be sound This passed CI on locally running rustc's arm-android Docker image.
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ChrisDenton
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Aug 29, 2024
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I don't necessarily want to block this PR in particular since this is a comment that could apply to alot of code in this repo but... it feels like we should be making more use of |
ChrisDenton
reviewed
Aug 29, 2024
3 tasks
The particular goal here was to keep the differences with the original down to minimize the likelihood that merging this into rust-lang/rust will cause a regression that will have a very short time to root-cause and fix. I originally didn't even want to fix #659. |
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ConradIrwin
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Sep 19, 2024
This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [backtrace](https://redirect.github.com/rust-lang/backtrace-rs) | dependencies | patch | `0.3.73` -> `0.3.74` | | [backtrace](https://redirect.github.com/rust-lang/backtrace-rs) | dev-dependencies | patch | `0.3.73` -> `0.3.74` | --- ### Release Notes <details> <summary>rust-lang/backtrace-rs (backtrace)</summary> ### [`v0.3.74`](https://redirect.github.com/rust-lang/backtrace-rs/releases/tag/0.3.74) [Compare Source](https://redirect.github.com/rust-lang/backtrace-rs/compare/0.3.73...0.3.74) #### What's Changed - QNX Neutrino 7.0 support, thanks to [@​nyurik](https://redirect.github.com/nyurik) in [https://github.com/rust-lang/backtrace-rs/pull/648](https://redirect.github.com/rust-lang/backtrace-rs/pull/648) - Cleaned up our Android support. This should massively improve backtraces for ones with the API level sufficient to ship with libunwind, etc. Unfortunately, it comes at the cost of dropping support for older ones! Thanks to [@​fengys](https://redirect.github.com/fengys) in [https://github.com/rust-lang/backtrace-rs/pull/656](https://redirect.github.com/rust-lang/backtrace-rs/pull/656) - Made PrintFmt, which was using the `Enum::__NonExhaustiveVariant` pattern, use `#[non_exhaustive]` for real. Don't @​ me if you were matching on that! Thanks to [@​nyurik](https://redirect.github.com/nyurik) in [https://github.com/rust-lang/backtrace-rs/pull/651](https://redirect.github.com/rust-lang/backtrace-rs/pull/651) - Massively cleaned up the windows code! We moved from winapi to windows-sys with windows-targets thanks to [@​CraftSpider](https://redirect.github.com/CraftSpider) and [@​ChrisDenton](https://redirect.github.com/ChrisDenton) in - Don't cast HANDLE to usize and back by [@​CraftSpider](https://redirect.github.com/CraftSpider) in [https://github.com/rust-lang/backtrace-rs/pull/635](https://redirect.github.com/rust-lang/backtrace-rs/pull/635) - Switch from `winapi` to `windows-sys` by [@​CraftSpider](https://redirect.github.com/CraftSpider) in [https://github.com/rust-lang/backtrace-rs/pull/641](https://redirect.github.com/rust-lang/backtrace-rs/pull/641) - Update windows bindings and use windows-targets by [@​ChrisDenton](https://redirect.github.com/ChrisDenton) in [https://github.com/rust-lang/backtrace-rs/pull/653](https://redirect.github.com/rust-lang/backtrace-rs/pull/653) - A bunch of updated dependencies. Thanks [@​djc](https://redirect.github.com/djc) and [@​khuey](https://redirect.github.com/khuey)! - Sorry if you were testing this code in miri! It started yelling about sussy casts. A lot. We did a bunch of internal cleanups that should make it quiet down, thanks to [@​workingjubilee](https://redirect.github.com/workingjubilee) in [https://github.com/rust-lang/backtrace-rs/pull/641](https://redirect.github.com/rust-lang/backtrace-rs/pull/641) - Uhhh we had to tweak `dl_iterate_phdr` in [https://github.com/rust-lang/backtrace-rs/pull/660](https://redirect.github.com/rust-lang/backtrace-rs/pull/660) after Android revealed it was... kind of unsound actually and not doing things like checking for null pointers before making slices! WHOOPS! Thanks to [@​saethlin](https://redirect.github.com/saethlin) for implementing detection for precisely that in rustc! It's really hard to find soundness issues in inherited codebases like this one... #### New Contributors - [@​CraftSpider](https://redirect.github.com/CraftSpider) made their first contribution in [https://github.com/rust-lang/backtrace-rs/pull/635](https://redirect.github.com/rust-lang/backtrace-rs/pull/635) - [@​fengys1996](https://redirect.github.com/fengys1996) made their first contribution in [https://github.com/rust-lang/backtrace-rs/pull/656](https://redirect.github.com/rust-lang/backtrace-rs/pull/656) - [@​djc](https://redirect.github.com/djc) made their first contribution in [https://github.com/rust-lang/backtrace-rs/pull/657](https://redirect.github.com/rust-lang/backtrace-rs/pull/657) **Full Changelog**: rust-lang/backtrace-rs@0.3.73...0.3.74 </details> --- ### Configuration 📅 **Schedule**: Branch creation - "after 3pm on Wednesday" in timezone America/New_York, Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- Release Notes: - N/A <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOC44MC4wIiwidXBkYXRlZEluVmVyIjoiMzguODAuMCIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==--> Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
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We
This passed CI on locally running rustc's arm-android Docker image.
Fixes #659.