https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241905
Bug ID: 241905
Summary: SSP setup is not thread-safe ?
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: misc
Assignee: [email protected]
Reporter: [email protected]
I think this is what it boils down to- qemu creates detached threads in
__constructor__ functions. When compiled statically with clang, maybe 40% of
the time I hit an SSP failure in one of these threads.
My current theory is that these threads spawn and race against __guard_setup. I
suspect that the SSP cookie is setup as the default, then later compared after
__guard_setup has run and the cookie has actually been initialized, then we get
a "failure" and qemu dies.
LLVM does a load from __stack_chk_guard, and that seems to just be a plain ol'
global, so the race seems plausible.
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