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Let QtTest use an alternate stack for its signal handlers

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Otherwise, the handler can't be called for a stack overflow.

Change-Id: I5d1e6f7607404caa96e4ffff13e7fabd66011785
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>
Reviewed-by: Jason McDonald <macadder1@gmail.com>
This commit is contained in:
Thiago Macieira 2015-06-15 10:51:37 -07:00
parent 1d9a6d0859
commit 7c8b3699bf
1 changed files with 14 additions and 1 deletions
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15
src/testlib/qtestcase.cpp
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@ -2439,7 +2439,7 @@ FatalSignalHandler::FatalSignalHandler()
sigemptyset(&handledSignals); sigemptyset(&handledSignals);
const int fatalSignals[] = { const int fatalSignals[] = {
SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGFPE, SIGSEGV, SIGPIPE, SIGTERM, 0 }; SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGBUS, SIGFPE, SIGSEGV, SIGPIPE, SIGTERM, 0 };
struct sigaction act; struct sigaction act;
memset(&act, 0, sizeof(act)); memset(&act, 0, sizeof(act));
@ -2449,6 +2449,19 @@ FatalSignalHandler::FatalSignalHandler()
#if !defined(Q_OS_INTEGRITY) #if !defined(Q_OS_INTEGRITY)
act.sa_flags = SA_RESETHAND; act.sa_flags = SA_RESETHAND;
#endif #endif
#ifdef SA_ONSTACK
// Let the signal handlers use an alternate stack
// This is necessary if SIGSEGV is to catch a stack overflow
static char alternate_stack[SIGSTKSZ];
stack_t stack;
stack.ss_flags = 0;
stack.ss_size = sizeof alternate_stack;
stack.ss_sp = alternate_stack;
sigaltstack(&stack, 0);
act.sa_flags |= SA_ONSTACK;
#endif
// Block all fatal signals in our signal handler so we don't try to close // Block all fatal signals in our signal handler so we don't try to close
// the testlog twice. // the testlog twice.
sigemptyset(&act.sa_mask); sigemptyset(&act.sa_mask);