Increase the size of the sigaltstack. #1315
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Rust's stack overflow handler installs a sigaltstack stack with size SIGSTKSZ, which is too small for some of the things we do in signal handlers, and as of this writing lacks a guard page. Install bigger sigaltstack stacks so that we have enough space, and have a guard page.
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iximeow
reviewed
Mar 13, 2020
ghost
reviewed
Mar 25, 2020
crates/runtime/src/traphandlers.rs
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| /// The size of the sigaltstack (not including the guard, which will be added). | ||
| /// Make this large enough to run our signal handlers. | ||
| static STACK_SIZE: usize = libc::SIGSTKSZ * 4; |
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FYI in Dfinity we use std::cmp::max(SIGSTKSZ, 24 * 1024) here, because SIGSTKSZ on MacOS is already huge (128K) and reserving 512K per thread for the signal stack seemed like too much
This was referenced Mar 30, 2020
sunfishcode
commented
Apr 3, 2020
crates/runtime/src/traphandlers.rs
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| return Err(Trap::oom()); | ||
| } | ||
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| // Prepare the stack with readable/writable memory and then reigster it |
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Rust's stack overflow handler installs a sigaltstack stack with size
SIGSTKSZ, which is too small for some of the things we do in signal
handlers, and as of this writing lacks a guard page. Install bigger
sigaltstack stacks so that we have enough space, and have a guard page.
This is similar to #1298 but rewritten in Rust