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Check if TCS is a null pointer on SGX #101442

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Merged
merged 1 commit into from
Sep 12, 2022
Merged

Check if TCS is a null pointer on SGX #101442

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8 changes: 6 additions & 2 deletions library/std/src/sys/sgx/abi/thread.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,11 @@ use fortanix_sgx_abi::Tcs;
#[unstable(feature = "sgx_platform", issue = "56975")]
pub fn current() -> Tcs {
extern "C" {
fn get_tcs_addr() -> Tcs;
fn get_tcs_addr() -> *mut u8;
}
let addr = unsafe { get_tcs_addr() };
match Tcs::new(addr) {
Some(tcs) => tcs,
None => rtabort!("TCS must not be placed at address zero (this is a linker error)"),
}
unsafe { get_tcs_addr() }
}