Rollup of 5 pull requests #99400
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Rollup of 5 pull requests #99400
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Usually opening a file handle with access set to metadata only will always succeed, even if the file is locked. However some special system files, such as `C:\hiberfil.sys`, are locked by the system in a way that denies even that. So as a fallback we try reading the cached metadata from the directory.
This was fixed in LLVM which was updated in rust-lang#98285. https://reviews.llvm.org/D127751 Fixes rust-lang#96797
Signed-off-by: Yuki Okushi <jtitor@2k36.org>
… r=thomcc Add assertion that `transmute_copy`'s U is not larger than T This is called out as a safety requirement in the docs, but because knowing this can be done at compile time and constant folded (just like the `align_of` branch is removed), we can just panic here. I've looked at the asm (using `cargo-asm`) of a function that both is correct and incorrect, and the panic is completely removed, or is unconditional, without needing build-std. I don't expect this to cause much breakage in the wild. I scanned through https://miri.saethlin.dev/ub for issues that would look like this (error: Undefined Behavior: memory access failed: alloc1768 has size 1, so pointer to 8 bytes starting at offset 0 is out-of-bounds), but couldn't find any. That doesn't rule out it happening in crates tested that fail earlier for some other reason, though, but it indicates that doing this is rare, if it happens at all. A crater run for this would need to be build and test, since this is a runtime thing. Also added a few more transmute_copy tests.
Windows: Use `FindFirstFileW` for getting the metadata of locked system files Fixes rust-lang#96980 Usually opening a file handle with access set to metadata only will always succeed, even if the file is locked. However some special system files, such as `C:\hiberfil.sys`, are locked by the system in a way that denies even that. So as a fallback we try reading the cached metadata from the directory. Note that the test is a bit iffy. I don't know if `hiberfil.sys` actually exists in the CI. r? rust-lang/libs
Add test for rust-lang#96797 This was fixed in LLVM which was updated in rust-lang#98285. https://reviews.llvm.org/D127751 Fixes rust-lang#96797
add missing null ptr check in alloc example `alloc` can return null on OOM, if I understood correctly. So we should never just deref a pointer we get from `alloc`.
…rrors Add regression test for rust-lang#95230 Closes rust-lang#95230 r? ``@compiler-errors`` Signed-off-by: Yuki Okushi <jtitor@2k36.org>
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@bors r+ rollup=never p=5 |
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⌛ Testing commit 86c049f with merge 74c13d400d77ce8d2a53763b43d2d2609c5c18d8... |
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💔 Test failed - checks-actions |
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Successful merges:
transmute_copy's U is not larger than T #98839 (Add assertion thattransmute_copy's U is not larger than T)FindFirstFileWfor getting the metadata of locked system files #98916 (Windows: UseFindFirstFileWfor getting the metadata of locked system files)global_asmmerged into other functions by LLVM #96797)Failed merges:
r? @ghost
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