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The offset of mcontext_t inside the libc::ucontext_t struct is incorrect #3655

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yujack008 opened this issue Apr 11, 2024 · 1 comment · May be fixed by #3894
Open

The offset of mcontext_t inside the libc::ucontext_t struct is incorrect #3655

yujack008 opened this issue Apr 11, 2024 · 1 comment · May be fixed by #3894
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C-bug Category: bug E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.

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@yujack008
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yujack008 commented Apr 11, 2024 •
edited by tgross35
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Cpp code:

DEBUG("off: 0x%x\n", (size_t)(&((ucontext_t *) data)->uc_mcontext) - (size_t)data);

output:

off: 0xB0

Rust code:

let ucontext = data as *const libc::ucontext_t;
let start = ucontext as usize;
let uc_mcontext_ref = &(*ucontext).uc_mcontext;
let uc_mcontext_ptr = uc_mcontext_ref as *const _;
let end = uc_mcontext_ptr as usize;
log::info!("off:0x{:x}",end -star);

output:

off:0x30

build for target aarch64-linux-android
@yujack008 yujack008 added the C-bug Category: bug label Apr 11, 2024
@devnexen
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would you be able to produce a PR ?

@tgross35 tgross35 added E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. and removed help wanted labels Aug 29, 2024
@CUB3D CUB3D linked a pull request Sep 1, 2024 that will close this issue
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C-bug Category: bug E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue.
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Fix alignment of uc_mcontext in ucontext_t on arm64 android CUB3D/rust_libc
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@devnexen @tgross35 @yujack008