Landing: c05b5e5d8cb6
Project / Subsystem
gcc / c/c++
Date
2025-09-13
Author
H.J. Lu
Commit
c05b5e5d8cb660ed43159d66fd669c20746d6bea
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- c/c++
- patch_id
- —
- commit_hash
- c05b5e5d8cb660ed43159d66fd669c20746d6bea
- source_type
- github
- headline
- C/C++: Enable user-defined stack protection guard symbols.
- tldr
- This change allows users to define the stack protection guard as a global symbol, and merges it if it matches the compiler's internal symbol.
- author
- H.J. Lu
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • c
- • c++
- • security
- • stack protection
- • ssp
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2025-09-13T00:00:00.000Z
This commit introduces a new target hook, stack_protect_guard_symbol_p, which allows users to define their own stack protection guard as a global symbol. If the hook returns true, the compiler declares __stack_chk_guard as a global uintptr_t variable and merges it with the user-declared variable if they match, including its visibility attribute. This enables more flexible stack protection schemes.