Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

openbsd: don't reallocate a guard page on the stack. #102854

Merged
merged 1 commit into from
Oct 13, 2022
Merged

openbsd: don't reallocate a guard page on the stack. #102854

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
10 changes: 10 additions & 0 deletions library/std/src/sys/unix/thread.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -767,6 +767,16 @@ pub mod guard {
const GUARD_PAGES: usize = 1;
let guard = guardaddr..guardaddr + GUARD_PAGES * page_size;
Some(guard)
} else if cfg!(target_os = "openbsd") {
// OpenBSD stack already includes a guard page, and stack is
// immutable.
//
// We'll just note where we expect rlimit to start
// faulting, so our handler can report "stack overflow", and
// trust that the kernel's own stack guard will work.
let stackptr = get_stack_start_aligned()?;
let stackaddr = stackptr.addr();
Some(stackaddr - page_size..stackaddr)
} else {
// Reallocate the last page of the stack.
// This ensures SIGBUS will be raised on
Expand Down