https://bugs.llvm.org/show_bug.cgi?id=41115
Bug ID: 41115
Summary: clang-cl on ARM should generate __security_push_cookie
/ __security_pop_cookie instead of __stack_chk_guard /
__stack_chk_fail
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangb...@nondot.org
Reporter: nicolaswe...@gmx.de
CC: llvm-bugs@lists.llvm.org, neeil...@live.com,
richard-l...@metafoo.co.uk
From
https://community.arm.com/developer/tools-software/tools/b/tools-software-ides-blog/posts/porting-putty-to-windows-on-arm
:
"""
There was one small wrinkle, which was stack protection. On x86, clang’s stack
protection is compatible with Visual Studio’s C library, but when targeting
Arm, I found that clang emitted references to __stack_chk_guard and
__stack_chk_fail, which are part of a stack protection system that’s not the
same as the one VS uses. The VS-compatible stack protection involves functions
called __security_push_cookie and __security_pop_cookie, and clang doesn’t know
how to generate calls to those. So I had to turn off stack protection (/GS-) on
the command line.
"""
We should fix this.
(The docs don't mention __security_push_cookie being arm-specific; maybe it's a
x-arch new thing?)
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