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Disable CFI for core and std CFI violations #115200

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merged 2 commits into from
Oct 4, 2023

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rcvalle
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@rcvalle rcvalle commented Aug 25, 2023

Work around #115199 by temporarily disabling CFI for core and std CFI violations to allow the user rebuild and use both core and std with CFI enabled using the Cargo build-std feature.

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r? @ehuss

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@rustbot rustbot added O-unix Operating system: Unix-like S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Aug 25, 2023
@rcvalle rcvalle added the PG-exploit-mitigations Project group: Exploit mitigations label Aug 25, 2023
@rcvalle rcvalle force-pushed the rust-cfi-fix-115199 branch from ad98511 to 68f1697 Compare August 25, 2023 03:27
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ehuss commented Aug 25, 2023

r? compiler

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@rustbot rustbot assigned b-naber and unassigned ehuss Aug 25, 2023
Comment on lines 283 to 284
// FIXME: Rust's "try catch" construct (i.e., std::panicking::r#try) use
// of FnOnce explicitly violates CFI.
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Is there a way to not have to tag this specific impl with no_sanitize(cfi)? Like putting it on something in panicking.rs instead? It seems a bit indirect to have to tag this impl for something that lives so far away.

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Yeah, if we have to tag FnOnce::call_once for this, it raises questions as to whether LLVM's CFI implementation can support Rust at all, because this is a lot of closures.

Comment on lines 15 to 17
// FIXME: Transmuting __cxa_thread_atexit_impl and indirectly branching
// to/calling it here is an explicit CFI violation.
#[no_sanitize(cfi)]
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What exactly is the CFI violation, here? If the concern is simply that *mut u8 is not *mut c_void, then it should work if it casts the *mut u8 and such to *mut c_void, no?

Though... why does CFI care about the difference between *mut c_void and *mut u8?

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(yeah, especially since c_void is repr(u8))

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I just adjusted the casts/transmutes in this indirect call site (see #115199 (comment)). Let me know if it looks good to you. I'll take a look at the other two.

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(I'll also take a look at the CI errors.)

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Okay, excellent. I'm still concerned about the need to change this in the general sense, but this looks much more understandable.

@rcvalle rcvalle force-pushed the rust-cfi-fix-115199 branch from 68f1697 to 477a586 Compare August 25, 2023 21:30
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@rcvalle rcvalle force-pushed the rust-cfi-fix-115199 branch from 477a586 to 0b62eb4 Compare August 25, 2023 21:40
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@rcvalle rcvalle force-pushed the rust-cfi-fix-115199 branch from 0b62eb4 to d4ed0a0 Compare August 25, 2023 23:34
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rcvalle commented Sep 13, 2023

FYI, I'm currently working on these--I just need a little bit more time.

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bors commented Sep 14, 2023

☔ The latest upstream changes (presumably #114656) made this pull request unmergeable. Please resolve the merge conflicts.

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maurer commented Sep 15, 2023

If we're landing workarounds by disabling CFI in particular places, can we land #[no_sanitize(kcfi)] adjacent to any instances of #[no_sanitize(cfi)]?

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rcvalle commented Sep 15, 2023

I'm not sure if we'll fix everything at once or temporarily land part of this PR to allow the user rebuild and use both core and std with CFI enabled in the meanwhile yet, but if we decide to do the later, I can definitely add #[no_sanitize(kcfi)] to it too.

I'm currently working on (3) from #115199, which is actually a bug in the CFI implementation, and either #[no_sanitize(cfi)] or #[no_sanitize(kcfi)] shouldn't be necessary there.

/// std links to by default may be a C or C++ implementation that was not
/// compiled using the Clang integer normalization option.
#[cfg(not(sanitizer_cfi_normalize_integers))]
#[cfi_encoding = "i"]
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why the explicit encoding? i would expect c_int to be an integer already as its repr(transparent).

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This is the encoding of the C int type, which from a CFI perspective is distinct from i32 or any other rust type. int and long can be the same size and in that case would be the same rust type, but CFI does distinguish between them unless -Zcfi-normalize-integers is used to only record the integer type size rather than it's name.

Works around rust-lang#115199 by temporarily disabling CFI for core and std CFI
violations to allow the user rebuild and use both core and std with CFI
enabled using the Cargo build-std feature.
Updates documentation for LLVM CFI support with recommended information
since the user can now rebuild and use both core and std with CFI
enabled using the Cargo build-std feature.
@rcvalle rcvalle force-pushed the rust-cfi-fix-115199 branch from d4ed0a0 to abece4f Compare October 4, 2023 17:14
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rcvalle commented Oct 4, 2023

I'd like to propose merging this PR, that works around (1) and (2) from #115199 by disabling CFI in those two specific locations, along with #116404, that fixes (3) also from #115199 (which the work around was removed from this PR). This would allow people to start experimenting with CFI and rebuild and use both core and std with CFI enabled, while I work on fixing (1) and (2).

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With the FnOnce concern being handled separately, this seems more reasonable.


[rust-book-ch19-05]: https://doc.rust-lang.org/book/ch19-05-advanced-functions-and-closures.html
[rust-book]: https://doc.rust-lang.org/book/title-page.html
Fig. 13. Build and execution of FIgs. 10–11 with LLVM CFI enabled.
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Suggested change
Fig. 13. Build and execution of FIgs. 10–11 with LLVM CFI enabled.
Fig. 13. Build and execution of Figs. 10–11 with LLVM CFI enabled.

library/std/src/sys/unix/thread_local_dtor.rs Show resolved Hide resolved
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@bors r+

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bors commented Oct 4, 2023

📌 Commit abece4f has been approved by workingjubilee

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 4, 2023
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rcvalle commented Oct 4, 2023

Thank you for your time on this, @workingjubilee! Much appreciated.

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bors commented Oct 4, 2023

⌛ Testing commit abece4f with merge eea2614...

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bors commented Oct 4, 2023

☀️ Test successful - checks-actions
Approved by: workingjubilee
Pushing eea2614 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 4, 2023
@bors bors merged commit eea2614 into rust-lang:master Oct 4, 2023
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@rustbot rustbot added this to the 1.75.0 milestone Oct 4, 2023
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Finished benchmarking commit (eea2614): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

This benchmark run did not return any relevant results for this metric.

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
2.6% [2.6%, 2.6%] 1
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 2.6% [2.6%, 2.6%] 1

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 622.858s -> 623.925s (0.17%)
Artifact size: 271.98 MiB -> 272.03 MiB (0.02%)

bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 6, 2023
23: Fix divergence from upstream `master` r=tshepang a=pvdrz

* rust-lang/rust#116483
  * rust-lang/rust#116475
  * rust-lang/rust#116329
  * rust-lang/rust#116198
  * rust-lang/rust#115588
  * rust-lang/rust#115522
  * rust-lang/rust#115454
* rust-lang/rust#111595
* rust-lang/rust#116018
* rust-lang/rust#116472
  * rust-lang/rust#116469
  * rust-lang/rust#116421
* rust-lang/rust#116463
* rust-lang/rust#101150
* rust-lang/rust#116269
* rust-lang/rust#116417
* rust-lang/rust#116455
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  * rust-lang/rust#116428
  * rust-lang/rust#116415
  * rust-lang/rust#116288
  * rust-lang/rust#116220
* rust-lang/rust#103046
* rust-lang/rust#114042
* rust-lang/rust#104153
* rust-lang/rust#116427
* rust-lang/rust#116443
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  * rust-lang/rust#116429
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* rust-lang/rust#116273
* rust-lang/rust#116184
* rust-lang/rust#116370
* rust-lang/rust#114417
* rust-lang/rust#115200
* rust-lang/rust#116413
* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
* rust-lang/rust#116406
* rust-lang/rust#116408
  * rust-lang/rust#116395
  * rust-lang/rust#116393
  * rust-lang/rust#116388
  * rust-lang/rust#116365
  * rust-lang/rust#116363
  * rust-lang/rust#116146
  * rust-lang/rust#115961
* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
  * rust-lang/rust#116379
  * rust-lang/rust#116328
  * rust-lang/rust#116282
  * rust-lang/rust#116261
  * rust-lang/rust#114654
* rust-lang/rust#116376
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  * rust-lang/rust#116371
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  * rust-lang/rust#116210
  * rust-lang/rust#115863
* rust-lang/rust#115025
* rust-lang/rust#116372
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  * rust-lang/rust#116355
  * rust-lang/rust#116351
  * rust-lang/rust#116158
  * rust-lang/rust#115726
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* rust-lang/rust#116083
* rust-lang/rust#102099
* rust-lang/rust#116356
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  * rust-lang/rust#116349
  * rust-lang/rust#116289
  * rust-lang/rust#114454
  * rust-lang/rust#114453
* rust-lang/rust#116331
* rust-lang/rust#116346
  * rust-lang/rust#116340
  * rust-lang/rust#116326
  * rust-lang/rust#116313
* rust-lang/rust#116276
* rust-lang/rust#115898
* rust-lang/rust#116325
* rust-lang/rust#116317
* rust-lang/rust#116207
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* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
* rust-lang/rust#116311
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* rust-lang/rust#116307
* rust-lang/rust#115670
* rust-lang/rust#116225
* rust-lang/rust#116302
* rust-lang/rust#116108
* rust-lang/rust#116160
* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
  * rust-lang/rust#116263
  * rust-lang/rust#116241
  * rust-lang/rust#116216
  * rust-lang/rust#116030
  * rust-lang/rust#116024
  * rust-lang/rust#112123
* rust-lang/rust#113301
* rust-lang/rust#113797
* rust-lang/rust#115759
* rust-lang/rust#116260
  * rust-lang/rust#116253
  * rust-lang/rust#116245
  * rust-lang/rust#116239
  * rust-lang/rust#116234
  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986

Co-authored-by: ouz-a <[email protected]>
Co-authored-by: bors <[email protected]>
Co-authored-by: Samuel Thibault <[email protected]>
Co-authored-by: linkmauve <[email protected]>
Co-authored-by: onur-ozkan <[email protected]>
Co-authored-by: asquared31415 <[email protected]>
Co-authored-by: Emmanuel Ferdman <[email protected]>
Co-authored-by: Ralf Jung <[email protected]>
Co-authored-by: Nadrieril <[email protected]>
Co-authored-by: Raekye <[email protected]>
Co-authored-by: Mark Rousskov <[email protected]>
Co-authored-by: Zalathar <[email protected]>
bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 9, 2023
23: Fix divergence from upstream `master` r=pietroalbini a=pvdrz

* rust-lang/rust#116483
  * rust-lang/rust#116475
  * rust-lang/rust#116329
  * rust-lang/rust#116198
  * rust-lang/rust#115588
  * rust-lang/rust#115522
  * rust-lang/rust#115454
* rust-lang/rust#111595
* rust-lang/rust#116018
* rust-lang/rust#116472
  * rust-lang/rust#116469
  * rust-lang/rust#116421
* rust-lang/rust#116463
* rust-lang/rust#101150
* rust-lang/rust#116269
* rust-lang/rust#116417
* rust-lang/rust#116455
  * rust-lang/rust#116452
  * rust-lang/rust#116428
  * rust-lang/rust#116415
  * rust-lang/rust#116288
  * rust-lang/rust#116220
* rust-lang/rust#103046
* rust-lang/rust#114042
* rust-lang/rust#104153
* rust-lang/rust#116427
* rust-lang/rust#116443
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  * rust-lang/rust#116431
  * rust-lang/rust#116429
  * rust-lang/rust#116296
  * rust-lang/rust#116223
* rust-lang/rust#116273
* rust-lang/rust#116184
* rust-lang/rust#116370
* rust-lang/rust#114417
* rust-lang/rust#115200
* rust-lang/rust#116413
* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
* rust-lang/rust#116406
* rust-lang/rust#116408
  * rust-lang/rust#116395
  * rust-lang/rust#116393
  * rust-lang/rust#116388
  * rust-lang/rust#116365
  * rust-lang/rust#116363
  * rust-lang/rust#116146
  * rust-lang/rust#115961
* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
  * rust-lang/rust#116379
  * rust-lang/rust#116328
  * rust-lang/rust#116282
  * rust-lang/rust#116261
  * rust-lang/rust#114654
* rust-lang/rust#116376
  * rust-lang/rust#116374
  * rust-lang/rust#116371
  * rust-lang/rust#116358
  * rust-lang/rust#116210
  * rust-lang/rust#115863
* rust-lang/rust#115025
* rust-lang/rust#116372
  * rust-lang/rust#116361
  * rust-lang/rust#116355
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* rust-lang/rust#116083
* rust-lang/rust#102099
* rust-lang/rust#116356
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  * rust-lang/rust#116349
  * rust-lang/rust#116289
  * rust-lang/rust#114454
  * rust-lang/rust#114453
* rust-lang/rust#116331
* rust-lang/rust#116346
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  * rust-lang/rust#116326
  * rust-lang/rust#116313
* rust-lang/rust#116276
* rust-lang/rust#115898
* rust-lang/rust#116325
* rust-lang/rust#116317
* rust-lang/rust#116207
* rust-lang/rust#116281
* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
* rust-lang/rust#116311
  * rust-lang/rust#116299
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* rust-lang/rust#116307
* rust-lang/rust#115670
* rust-lang/rust#116225
* rust-lang/rust#116302
* rust-lang/rust#116108
* rust-lang/rust#116160
* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
  * rust-lang/rust#116263
  * rust-lang/rust#116241
  * rust-lang/rust#116216
  * rust-lang/rust#116030
  * rust-lang/rust#116024
  * rust-lang/rust#112123
* rust-lang/rust#113301
* rust-lang/rust#113797
* rust-lang/rust#115759
* rust-lang/rust#116260
  * rust-lang/rust#116253
  * rust-lang/rust#116245
  * rust-lang/rust#116239
  * rust-lang/rust#116234
  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986

Co-authored-by: bors <[email protected]>
Co-authored-by: ouz-a <[email protected]>
Co-authored-by: Samuel Thibault <[email protected]>
Co-authored-by: linkmauve <[email protected]>
Co-authored-by: onur-ozkan <[email protected]>
Co-authored-by: asquared31415 <[email protected]>
Co-authored-by: Emmanuel Ferdman <[email protected]>
Co-authored-by: Ralf Jung <[email protected]>
Co-authored-by: Nadrieril <[email protected]>
Co-authored-by: Raekye <[email protected]>
Co-authored-by: Mark Rousskov <[email protected]>
Co-authored-by: Zalathar <[email protected]>
bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 9, 2023
23: Fix divergence from upstream `master` r=Dajamante a=pvdrz

* rust-lang/rust#116483
  * rust-lang/rust#116475
  * rust-lang/rust#116329
  * rust-lang/rust#116198
  * rust-lang/rust#115588
  * rust-lang/rust#115522
  * rust-lang/rust#115454
* rust-lang/rust#111595
* rust-lang/rust#116018
* rust-lang/rust#116472
  * rust-lang/rust#116469
  * rust-lang/rust#116421
* rust-lang/rust#116463
* rust-lang/rust#101150
* rust-lang/rust#116269
* rust-lang/rust#116417
* rust-lang/rust#116455
  * rust-lang/rust#116452
  * rust-lang/rust#116428
  * rust-lang/rust#116415
  * rust-lang/rust#116288
  * rust-lang/rust#116220
* rust-lang/rust#103046
* rust-lang/rust#114042
* rust-lang/rust#104153
* rust-lang/rust#116427
* rust-lang/rust#116443
  * rust-lang/rust#116432
  * rust-lang/rust#116431
  * rust-lang/rust#116429
  * rust-lang/rust#116296
  * rust-lang/rust#116223
* rust-lang/rust#116273
* rust-lang/rust#116184
* rust-lang/rust#116370
* rust-lang/rust#114417
* rust-lang/rust#115200
* rust-lang/rust#116413
* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
* rust-lang/rust#116406
* rust-lang/rust#116408
  * rust-lang/rust#116395
  * rust-lang/rust#116393
  * rust-lang/rust#116388
  * rust-lang/rust#116365
  * rust-lang/rust#116363
  * rust-lang/rust#116146
  * rust-lang/rust#115961
* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
  * rust-lang/rust#116379
  * rust-lang/rust#116328
  * rust-lang/rust#116282
  * rust-lang/rust#116261
  * rust-lang/rust#114654
* rust-lang/rust#116376
  * rust-lang/rust#116374
  * rust-lang/rust#116371
  * rust-lang/rust#116358
  * rust-lang/rust#116210
  * rust-lang/rust#115863
* rust-lang/rust#115025
* rust-lang/rust#116372
  * rust-lang/rust#116361
  * rust-lang/rust#116355
  * rust-lang/rust#116351
  * rust-lang/rust#116158
  * rust-lang/rust#115726
  * rust-lang/rust#113053
* rust-lang/rust#116083
* rust-lang/rust#102099
* rust-lang/rust#116356
  * rust-lang/rust#116350
  * rust-lang/rust#116349
  * rust-lang/rust#116289
  * rust-lang/rust#114454
  * rust-lang/rust#114453
* rust-lang/rust#116331
* rust-lang/rust#116346
  * rust-lang/rust#116340
  * rust-lang/rust#116326
  * rust-lang/rust#116313
* rust-lang/rust#116276
* rust-lang/rust#115898
* rust-lang/rust#116325
* rust-lang/rust#116317
* rust-lang/rust#116207
* rust-lang/rust#116281
* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
* rust-lang/rust#116311
  * rust-lang/rust#116299
  * rust-lang/rust#116295
  * rust-lang/rust#116292
* rust-lang/rust#116307
* rust-lang/rust#115670
* rust-lang/rust#116225
* rust-lang/rust#116302
* rust-lang/rust#116108
* rust-lang/rust#116160
* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
  * rust-lang/rust#116263
  * rust-lang/rust#116241
  * rust-lang/rust#116216
  * rust-lang/rust#116030
  * rust-lang/rust#116024
  * rust-lang/rust#112123
* rust-lang/rust#113301
* rust-lang/rust#113797
* rust-lang/rust#115759
* rust-lang/rust#116260
  * rust-lang/rust#116253
  * rust-lang/rust#116245
  * rust-lang/rust#116239
  * rust-lang/rust#116234
  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986

35: Automated pull from `rust-lang/libc` r=pietroalbini a=github-actions[bot]

This PR pulls the following changes from the [`rust-lang/libc`](https://github.com/rust-lang/libc) repository:

* rust-lang/libc#3335
* rust-lang/libc#3373
* rust-lang/libc#3360
* rust-lang/libc#3374
* rust-lang/libc#3375
* rust-lang/libc#3376
* rust-lang/libc#3377


Co-authored-by: ouz-a <[email protected]>
Co-authored-by: Samuel Thibault <[email protected]>
Co-authored-by: bors <[email protected]>
Co-authored-by: linkmauve <[email protected]>
Co-authored-by: onur-ozkan <[email protected]>
Co-authored-by: asquared31415 <[email protected]>
Co-authored-by: Emmanuel Ferdman <[email protected]>
Co-authored-by: Ralf Jung <[email protected]>
Co-authored-by: Nadrieril <[email protected]>
Co-authored-by: Raekye <[email protected]>
Co-authored-by: Mark Rousskov <[email protected]>
Co-authored-by: Zalathar <[email protected]>
Co-authored-by: Nikolay Arhipov <[email protected]>
Co-authored-by: Brian Cain <[email protected]>
Co-authored-by: Steve Lau <[email protected]>
Co-authored-by: David CARLIER <[email protected]>
Co-authored-by: Louis Dupré Bertoni <[email protected]>
Co-authored-by: Taiki Endo <[email protected]>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
@rcvalle rcvalle deleted the rust-cfi-fix-115199 branch April 22, 2024 23:06
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