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bpo-43390: Set SA_ONSTACK in PyOS_setsig (GH-24730)

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This is friendlier to other in-process code that an extension module or
embedding use could pull in such as CGo where tiny stacks are the norm
and sigaltstack() has been used to provide for signal handlers.

Without this, signals received by a process using tiny stacks may lead
to stack overflow crashes.
This commit is contained in:
Gregory P. Smith 2021-03-04 21:49:30 -08:00 • committed by GitHub
parent 2122e48630
commit 02ac6f41e5
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2 changed files with 10 additions and 1 deletions
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Python/pylifecycle.c
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@ -2884,7 +2884,10 @@ PyOS_setsig(int sig, PyOS_sighandler_t handler)
struct sigaction context, ocontext;
context.sa_handler = handler;
sigemptyset(&context.sa_mask);
context.sa_flags = 0;
/* Using SA_ONSTACK is friendlier to other C/C++/Golang-VM code that
* extension module or embedding code may use where tiny thread stacks
* are used. https://bugs.python.org/issue43390 */
context.sa_flags = SA_ONSTACK;
if (sigaction(sig, &context, &ocontext) == -1)
return SIG_ERR;
return ocontext.sa_handler;