mikros/rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Fix stack-protector.rs on LLVM 17

Browse Source 
Prevent fill from being (correctly) optimized away by passing the
address of the alloca to black_box.
This commit is contained in:
Nikita Popov 2023-07-25 11:52:44 +02:00 committed by Nikita Popov
parent ad7ea8b7e6
commit 01cdc505d9
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tests/ui/abi/stack-protector.rs
View File

@ -40,6 +40,8 @@ fn vulnerable_function() {
// Overwrite the on-stack return address with the address of `malicious_code()`, // Overwrite the on-stack return address with the address of `malicious_code()`,
// thereby jumping to that function when returning from `vulnerable_function()`. // thereby jumping to that function when returning from `vulnerable_function()`.
unsafe { fill(stackaddr, bad_code_ptr, 20); } unsafe { fill(stackaddr, bad_code_ptr, 20); }
// Capture the address, so the write is not optimized away.
std::hint::black_box(stackaddr);
} }
// Use an uninlined function with its own stack frame to make sure that we don't // Use an uninlined function with its own stack frame to make sure that we don't