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Document stack-protector option

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Only updated `exploit-mitigations.md` to reflect that the option exists. Removed the alternatives
mentioned as they are not actually implemented yet.

As this is an unstable feature, should it be added to `unstable-book` also? I didn't do that because
I couldn't find the tracking issue for it. (There should be one to track stabilization of the
feature.)
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Marcin S 2023-05-18 08:44:00 -04:00
parent 9052ca9393
commit 21517923e1
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11
src/doc/rustc/src/exploit-mitigations.md
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@ -115,9 +115,9 @@ equivalent.
<tr>
<td>Stack smashing protection
</td>
<td>No
<td>Yes
</td>
<td>
<td>Nightly
</td>
</tr>
<tr>
@ -432,9 +432,7 @@ saved return instruction pointer, and checking if this value has changed
when returning from a function. This is also known as “Stack Protector” or
“Stack Smashing Protector (SSP)”.
The Rust compiler does not support stack smashing protection. However, more
comprehensive alternatives to stack smashing protection exist, such as
shadow and safe stack (see backward-edge control flow protection).
The Rust compiler supports stack smashing protection on nightly builds[42].
![Screenshot of IDA Pro listing cross references to __stack_chk_fail in hello-rust.](images/image3.png "Cross references to __stack_chk_fail in hello-rust.")
Fig. 14. IDA Pro listing cross references to `__stack_chk_fail` in
@ -697,3 +695,6 @@ defaults (unrelated to `READ_IMPLIES_EXEC`).
41. “ControlFlowIntegrity.” The Rust Unstable Book.
[https://doc.rust-lang.org/unstable-book/compiler-flags/sanitizer.html#controlflowintegrity](../unstable-book/compiler-flags/sanitizer.html#controlflowintegrity).
42. bbjornse. “add codegen option for using LLVM stack smash protection #84197.”
GitHub. <https://github.com/rust-lang/rust/pull/84197>