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from_u32_unchecked: check validity, and fix UB in Wtf8 #72683

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merged 5 commits into from
May 31, 2020
Merged

from_u32_unchecked: check validity, and fix UB in Wtf8 #72683

merged 5 commits into from
May 31, 2020

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RalfJung
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@RalfJung RalfJung commented May 28, 2020 •
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Fixes #72760

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r? @withoutboats

(rust_highfive has picked a reviewer for you, use r? to override)

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 28, 2020
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@bors r+

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bors commented May 28, 2020

📌 Commit 1956ada4c855673de327f16c91d11fdc4cd5a39c has been approved by Mark-Simulacrum

@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 May 28, 2020
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@bors r-

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels May 28, 2020
@RalfJung RalfJung removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label May 29, 2020
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@Mark-Simulacrum I fixed the endless recursion.

@RalfJung RalfJung added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 29, 2020
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r? @Mark-Simulacrum
(sorry for double-ping)

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@bors r+

No worries!

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bors commented May 29, 2020

📌 Commit 52ed89a has been approved by Mark-Simulacrum

@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 May 29, 2020
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this pull request May 29, 2020
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Rollup merge of rust-lang#72683 - RalfJung:char-debug-check, r=Mark-S…
793967b 
…imulacrum

from_u32_unchecked: check validity when debug assertions are enabled
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This actually caused CI to fail in #72736 (comment)

---- sys_common::wtf8::tests::wtf8_as_str stdout ----
thread 'sys_common::wtf8::tests::wtf8_as_str' panicked at 'called `Option::unwrap()` on a `None` value', /checkout/src/libcore/char/convert.rs:102:33

---- sys_common::wtf8::tests::wtf8_code_points stdout ----
thread 'sys_common::wtf8::tests::wtf8_code_points' panicked at 'called `Option::unwrap()` on a `None` value', /checkout/src/libcore/char/convert.rs:102:33

...

@bors r-

Our wtf8 code seems to have UB.^^

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels May 29, 2020
@RalfJung RalfJung changed the title from_u32_unchecked: check validity when debug assertions are enabled from_u32_unchecked: check validity, and fix UB in Wtf8 May 30, 2020
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@SimonSapin I implemented the fix you suggested here.

@RalfJung RalfJung added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-blocked Status: Marked as blocked ❌ on something else such as an RFC or other implementation work. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 30, 2020
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r=me with comment added, unless you want to wait for @SimonSapin's review in particular (but AFAICT this is just moving some code around so I feel comfortable approving)

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I added comments but tried to avoid claiming that this is valid UTF-8... what do you think?

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RalfJung commented May 30, 2020
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r=me

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@bors r=Mark-Simulacrum

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bors commented May 30, 2020

📌 Commit 0fb6e63 has been approved by Mark-Simulacrum

@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 May 30, 2020
@RalfJung RalfJung mentioned this pull request May 30, 2020
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@dtolnay dtolnay added the T-libs Relevant to the library team, which will review and decide on the PR/issue. label May 30, 2020
RalfJung added a commit to RalfJung/rust that referenced this pull request May 31, 2020
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Rollup merge of rust-lang#72683 - RalfJung:char-debug-check, r=Mark-S…
dd92106 
…imulacrum

from_u32_unchecked: check validity, and fix UB in Wtf8

Fixes rust-lang#72760
@RalfJung RalfJung mentioned this pull request May 31, 2020
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@RalfJung RalfJung mentioned this pull request May 31, 2020
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bors added a commit to rust-lang-ci/rust that referenced this pull request May 31, 2020
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Auto merge of rust-lang#72813 - RalfJung:rollup-4ko6q8j, r=RalfJung
f6072ca 
Rollup of 5 pull requests

Successful merges:

 - rust-lang#72683 (from_u32_unchecked: check validity, and fix UB in Wtf8)
 - rust-lang#72715 (Account for trailing comma when suggesting `where` clauses)
 - rust-lang#72745 (generalize Borrow<[T]> for Interned<'tcx, List<T>>)
 - rust-lang#72749 (Update stdarch submodule to latest head)
 - rust-lang#72781 (Use `LocalDefId` instead of `NodeId` in `resolve_str_path_error`)

Failed merges:

r? @ghost
@bors bors merged commit 3bbb475 into rust-lang:master May 31, 2020
bors added a commit to rust-lang/miri that referenced this pull request May 31, 2020
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Auto merge of #1440 - RalfJung:wtf8, r=RalfJung
a8df047 
test WTF8 encoding corner cases

This adds a Miri-side test for rust-lang/rust#72760.

Blocked on rust-lang/rust#72683.
@RalfJung RalfJung deleted the char-debug-check branch June 1, 2020 22:47
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OsString::from_wide (in Windows OsStringExt) is unsound
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